HS-U449_Service_Manual.pdf part of mitsubishi hsu449 HS-U449_Service_Manual.part1.rar, most information in this manual will apply to any hs-u7** model text manual preview

Text preview for : HS-U449_Service_Manual.pdf part of mitsubishi hsu449 most information in this manual will apply to any hs-u7** model

Back to : HS-U449_Service_Manual.pa | Home

2003

VIDEO CASSETTE RECORDER

MODEL

HS-U449

Only cassettes marked VHS can be used with this video cassette recorder.

SPECIFICATIONS
Tape Format Power Source Power Consumption Video Signal System Video Recording System Luminance Color Signal Hi-Fi Audio Recording System Linear Audio Track Tape Speed Record/Playback Time : VHS 1/2" high-density video cassette tape : 120 V AC ; 60 Hz : Approx. 20 W (STBY 3 W) : EIA standard ; NTSC color : VHS standard : Frequency modulation recording : Low frequency conversion sub-carrier phase shift recording : VHS standard Azimuth helical scanning system : 1 track : 1-5/16 i.p.s (standard play) 7/16 i.p.s (extended play) : 120 min. with T-120 video cassette (SP mode) 360 min. with T-120 video cassette (EP mode) : : : : 4 heads 2 heads 1 head 1 head : 0.5 - 2.0 V(p-p), 75 unbalanced RCA Pin Jack Audio Input : 346 mV(rms), 47 k unbalanced RCA Pin Jack Video Output : 1.0 V(p-p), 75 unbalanced RCA Pin Jack Audio Output : 346 mV(rms), 1 k unbalanced RCA Pin Jack Tuner VHF : 54 - 88 MHz, 174 - 216 MHz UHF : 470 - 806 MHz CATV : 54 - 88 MHz, 90 - 804 MHz Operating Temperature : 41 - 104°F Relative Humidity : 30 - 80% RF Channel Output : Channel 3 or 4 switchable Weight : Approx. 8.0 lbs. (3.6 kg) Dimensions : 16.7"(W) × 3.7"(H) × 11.9"(D) 425 (W) × 93 (H) × 302 (D) mm Timer Program Capacity : 1 month programmable / 8 programs : Deck Deck Video Input

Record/Playback System Video Hi-Fi Audio Monaural Audio Control Erase

· Weight and dimensions shown are approximate. · Design and specifications are subject to change without notice.

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Ave. Irvine, California 92618 U.S.A.
Copyright C 2003 Mitsubishi Digital Electronics America, Inc. All Rights Reserved.

CONTENTS
- FILE "COVERPGE" SPECIFICATIONS ...........................................................1 CONTENTS......................................................................2 GLOSSARY OF ABBREVIATIONS.................................4 - FILE "DISASSY" SAFETY PRECAUTIONS ................................................1 CONNECTION .................................................................3 DISASSEMBLY................................................................4 HOW TO EXECUTE CIRCUIT BOARD SERVICE...........7 CHIP PARTS REPLACEMENT........................................9 - FILE "ELCTADJ" HOW TO INITIALIZE THE E2PROM................................1 WHEN REPLACING IC5A0 .............................................1 ELECTRICAL ADJUSTMENTS.......................................1 Servo circuit..................................................................2 - FILE "MECHAADJ" MECHANICAL ADJUSTMENT AND REPLACEMENT...............................1 1. DECK Cleaning...................................................1 1-1 VIDEO HEAD .................................................1 1-2 Tape Running System ....................................1 1-3 REEL DISK Drive System ..............................1 2. Replacement of Major Parts ..............................2 2-1 CLEANING ARM ...........................................2 2-2 STAY PLATE ..................................................2 2-3 BOTTOM ASSY.............................................3 2-4 INSERT GUIDE (TU) .....................................4 2-5 INSERT GUIDE (SP) .....................................4 2-6 REC HOLDER, REC LEVER, REC SPRING ................................................5 2-7 F/L ARM ASSY, F/L BEARING......................5 2-8 A/C HEAD UNIT ............................................6 2-9 F/E HEAD UNIT.............................................6 2-10 SENSOR COVER (TU)..................................7 2-11 SENSOR COVER (SP)..................................7 2-12 REV UNIT (TU), REV UNIT (SP)..............................................8 2-13 MODE POSITION UNIT ................................8 2-14 REEL BELT, PULLEY BUSH, THRUST WASHER, BELT PULLEY, SHIFT SLIDER, PULLEY GEAR ASSY, SLIP GEAR, SLIP SPRING, SLIP WASHER, THRUST WASHER, SLIP ADJUSTER, IDLER 2 UNIT................................................9 2-15. CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY ............................11 2-16 FC HOLDER, MOTOR HOLDER, LOADING WORM, LOADING MOTOR ASSY, WORM WHEEL ...........................................12 2-17 PINCH ARM CAP, PINCH UNIT ..................13 2-18 F/L PLATE, DOOR ARM..............................13 2-19 BRAKE CAM PLATE ...................................14 2-20 GUIDE LAMP ..............................................15 2-21 MAIN CAM, GUIDE ARM (TU), BRAKE LEVER,LB PIN ...............................16 2-22 L/D LOCK LEVER .......................................17 2-23 BRAKE BELT (SP), BELT HOLDER ............17 2-24 BELT LEVER, BELT ADJUSTER.................18 2-25 TENSION ARM, TENSION LEVER, TENSION SPRING, TENS AXIS HOLDER, REEL DISK (SP side) ..................................18 2-26 BRAKE BELT (TU).......................................19 2-27 BRAKE (TU), REEL DISK (TU side)............19 2-28 SHIFT LEVER .............................................20 2-29 CHARGE SPRING, SWING LEVER, CHARGE ASSY...........................................21 2-30 LOADING ARM ASSY (SP), LOADING ARM ASSY (TU).........................21 2-31 A/L LEVER ..................................................22 2-32 TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU) ............................24 2-33 DRUM CLAMPER, DRUM ASSY ................25 2-34 DRUM MOTOR STATOR, BRUSH SPRING, SPACER, ROTOR CASE, END RING, BRUSH, UPPER DRUM ASSY ...................26 2-35 CAPSTAN MOTOR ......................................27 3. Interchangeability Adjustment of the Mechanism.............................................29 3-1 Adjustment of BACK TENSION and TENSION POLE's Position..........................29 3-2 Check and Adjustment of the FM Envelope..........................................30 3-2-1 GUIDE ROLLER Adjustment Check............30 3-2-2 Height Adjustment of GUIDE ROLLER (SP)..................................30 3-2-3 Height Adjustment of GUIDE ROLLER (TU)..................................30 3-2-4 Coarse Adjustment of Phase.......................31 3-2-5 Flatness Check of FM Waveform.................31

-2-

CONTENTS
3-2-6 Tape Running Condition at the GUIDE ROLLERs (Check1) ...............32 3-2-7 Tape Running Condition at the GUIDE ROLLERs (Check 2) ..............32 3-3 A/C HEAD Adjustment .................................33 3-3-1 Slant Adjustment of A/C HEAD ....................33 3-3-2 Azimuth and Height Adjustment of A/C HEAD ....................................................33 3-4 Phase Adjustment ........................................34 3-5 Tape wrinkle check.......................................34 4. Servicing Tape Jam during the Loading Process .........................35 SERVICE CAN BE EXECUTED WITH THE EE PICTURE DISPLAYED ..........................36 DECK OPERATION CHECK .........................................36 - FILE "PARTSLST" Parts List .........................................................................1 1. CABINET ASSEMBLY ........................................2 1. CABINET ASSEMBLY LIST................................3 2. PACKING PARTS................................................4 2. PACKING PARTS LIST .......................................5 3. ELECTRICAL PARTS .........................................6 - FILE "DECKASSY" DECK ASSEMBLY-1.........................................................1 DECK ASSEMBLY-1 LIST ................................................2 DECK ASSEMBLY-2.........................................................4 DECK ASSEMBLY-2 LIST ................................................5 - FILE "SCHEMATC" BLOCK DIAGRAMS SCHEMATIC DIAGRAMS PRINTED CIRCUIT BOARD PARTS LAYOUT

-3-

GLOSSARY OF ABBREVIATIONS
A/C A-PB A-REC AE AENV AFC AFF AFTV ALC AMODE AMPC APC ATFN ATT BLMUTE C/N CCD CG-CS CHSW CLKSEL CNTR COM CONV SW CP-FG CP-REV CPMOTORV CROT CSYNC CTL D.E. D-FF DEMOD DET DLY DOC DOCSTOP DR-FG DR-OUT DR-PG EE EMPH EP EQ ES FBC FE FF FG FLDCS FM FS FSC G HASW HFR400 HFRSS HSYNC I-LIMIT : Audio/Control : Audio Play Back : Audio Recording : Audio Erase : Audio Envelope : Automatic Frequency Control : Audio Flip Flop : Auto Fine Tuning Voltage : Automatic Level Control : Audio Mode : Amplifier Alternating Current Ground : Automatic Phase Control : Auto Fine : Attenuator : Blue Back Mute : Carrier/Noise Ratio : Charge Coupled Device : Character Generator-Chip Slect : Channel Switch : Clock Select : Counter : Comparator : Converter Switch : Capstan-Frequency Generator : Capstan-Reverse : Capstan Motor Voltage : Chroma Rotation : Composite Synchronizing Signal : Control : Detail Enhancer : Drum Flip Flop : Demodulator : Detector : Delay : Drop Out Compensator : Drop Out Control Stop : Drum-Frequency Generator : Drum Control Out : Drum-Phase Generator : Electronic-Electronic : Emphasis : Extended Play : Equalizer : End Sensor : Feed Back Clamp : Full Erase : Fast Forward : Frequency Generator : Fluorescent Tube Driver Chip Slect : Frequency Modulation : Forward Search : Frequency of Color Subcarrier : Ground : Head Amplifier Switch : Hi-Fast Forward/Reverse Speed Search 400 : Hi-Fast Forward/Reverse Speed Search : Horizontal Synchronizing Signal : I(Current)-Limitter JSTCLK LIN-IN LIN-OUT LMUTE LP MOD MOTORV NL OSC PB PC PCB PG PLL PRT PSAVE PSLED PSYNC PWSV PWV QH QV REC REC2 RECPBC RES RESPCM REW RIS RMSDET RS RXD SAPIND SCLK SCR SI SLD SP SS SSVSYNC STRB SU-SENS TSREC TSSW TU-SENS V-REF VBUSY VCA VCO VENV VSETCLK VSETCS YNR : Just Clock : Linear Audio In : Linear Audio Out : Linear Mute : Long Play : Modulator : Motor Voltage : Non Linear : Oscillator : Play Back : Position Control : Printed Circuit Board : Pulse Generator : Phase Locked Loop : Protect : Power Save : Power Save Light Emitting Diode : Pretened Vartical Synchronizing Signal : Power Save : ON/OFF Command to supply B + Power : Cue Horizontal Signal : Cue Vertical Signal : Recording : Record Command for the PB/REC Control Circuit : Record/Play Back Chroma Signal : Reset : Reset Pulse Code Modulation : Rewind : Record Inhibit Switch : Root Mean Square Detector : Reverse Search : Read X Data : SAP carrier detect Indicator : Serial Clock : Scramble : Serial control data Input : Side Lock Detector : Standard Play : Start Sensor : Speed Search Vertical Synchronizing Signal : Strobe : Supply Reel Sensor : Tape Simulate Recording : Tape Simulator Switch : Take Up Reel Sensor : Voltage Reference : VSET Busy : Voltage Control Amplifier : Voltage Controlled Oscillator : Video Envelope : VSET Clock : VSET Chip Select : Y(Luminance) Signal Noise Reduction

-4-

SAFETY PRECAUTIONS
INTRODUCTION
This manual provides service information for the adjustments of mechanical and electrical operations. Due to design modifications, the servicing procedures and data given in this manual are subject to possible change without prior notice.

SAFETY NOTICE
Before returning VCR to the customer a safety check of the entire VCR should be made. The service technician must be sure that no protective device built into the instrument by the manufacturer has become defective or inadvertently damaged during servicing. Observe all caution and safety related notes located on or inside the VCR cabinet. WARNING : Alterations of the design or circuitry of this VCR should not be made. Any design alterations or additions, such as circuit modifications, auxiliary speaker jacks, switches, grounding, active or passive circuitry, etc., or use of unauthorized camera, cables, accessories, etc. may alter the safety characteristics of this VCR and potentially create a hazardous situation for the user. Any design alterations or unauthorized additions will invalidate the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting from them. Do not lubricate any motors. When reassembling the VCR, always be certain that all the protective devices are put back in place, such as non-metallic control knobs, shield plates, etc. When service is required, observe the original lead dress. Components that show evidence of overheating or other electrical or mechanical damage should be replaced.

WARNING : Many of the programs broadcast by television stations are protected by copyright and Federal law imposes strict penalties for copyright infringement. Some motion picture companies have taken the position that home recording for non-commercial purposes is an infringement of their copyrights. Until the courts have ruled on the proper interpretation of the law as applied to home video recording, this equipment, if used to record copyrighted material, should be operated at the user's own risk. WARNING : TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. This video cassette recorder should be used with AC 120V, 60Hz only.

WARNING : Replace with same type 1.6A, 125V FUSE. LEAKAGE CURRENT CHECK
Before returning the VCR to the customer, it is recommended the leakage current be measured by the following methods. 1. Cold Check With the AC plug removed from the 120V AC source, place a jumper across the two AC plug prongs. Turn the AC switch on. Using an ohmmeter, connect one lead to the AC plug with the jumper and touch the other lead to each exposed metal part (metal cabinet, screwheads, metal overlays, control shafts, etc.), particularly any exposed metal part having a return path to the chassis. Exposed metal parts having a return path to the chassis should have a minimum resistance reading of 1 M. Any resistance below this value indicates an abnormality which requires corrective action. Exposed metal parts not having a return path to the chassis will indicate an open circuit.

-1-

2. Hot Check The test sequence, with reference to the measuring circuit in the figure is as follows: (1) With switch S1 open, connect the VCR to the measuring circuit. Immediately after connection, measure the leakage current using both positions of switch S2 and with the switching devices in the VCR in all of their operating positions.

(2) Close switch S1, energizing the VCR, and immediately after closing the switch, measure leakage current using both positions of switch S2, and with the switching devices in the VCR in all of their operating positions. Repeat the current measurements of items (1) and (2) after the VCR has reached thermal stabilization. The leakage current should not be more than 0.5 mA.

S2 120V GH (GROUNDING) OPEN

VCR A

AC MILLIAMMETER

S1

INSULATING TABLE B

GROUNDING SUPPLY CONDUCTOR

AC Leakage Test Avoid shock hazards. Do not connect this VCR to a TV antenna, cable or accessory that exhibits excessive leakage currents. If available, the television instrument or cable to which this VCR is connected should have the antenna cold check and leakage current hot check performed.

PRECAUTIONS
Handling and storage · Avoid using the VCR in the following places: - extremely hot, cold or humid places, - dusty places, - near appliances generating strong magnetic fields, - places subject to vibration, - poorly ventilated areas. · Be careful of moisture condensation. · If you pour a cold liquid into a glass, water vapor in the air will condense on the surface of the glass. This is called moisture condensation. · Moisture condensation on the head drum, one of the most critical parts of the VCR, will cause damage to the tape. · The VCR is equipped with a moisture condensation prevention circuit. This circuit operates only when the unit is attached to an AC outlet. · Handle the VCR carefully. · Do not block the ventilation openings. · Do not place anything heavy on the recorder. · Do not place liquids on the top cover of the recorder. · Use the Recorder in horizontal (flat) position only. · Avoid violent shocks to the recorder during packing and transportation. · Before packing, be sure to remove the cassette from the recorder.

-2-

CONNECTION
Connecting separate antennas (UHF/VHF) Connecting the Television To connect separate UHF/VHF antennas to the VCR: 1. Disconnect the antennas from the back of your TV. 2. Connect the antenna leads to the combiner. 3. Screw or push the combiner onto the ANTENNA terminal on the VCR labeled ANTENNA IN. 4. When you are finished, refer to "Connecting the Television" to complete your connections. Now that you've completed the antenna connections to your VCR, you're ready to connect the VCR to the TV. Because every television is different (especially older model TVs), your VCR may need to be connected in a variety of ways. See the Owner's Manual for Instruction Information ON: · Determining if you need a splitter, · Connecting TVs with audio and video inputs.

Antenna VHF

Antenna UHF

300 Ohm Flat Twin Lead 75 Ohm Coaxial Cable

300 Ohm Flat Twin Lead

3 2
VHF
x x
x x

TV ANTENNA TERMINAL
IN

UHF

ANTENNA
OUT

1
ANTENNA OUT ANTENNA IN

2
ANTENNA IN

300 Ohm Transformer

Combiner

VCR ANTENNA TERMINAL

TV without ANTENNA IN terminal (single antenna terminal for VHF and UHF) UHF/VHF Splitter Connect to UHF IN on TV. UHF/VHF Splitter Connect to UHF IN on TV.

L

L

L

From ANTENNA OUT on VCR

Connect to VHF IN on TV.

L

L

From ANTENNA OUT on VCR

L

L

L L

L

L L

Connect to VHF IN on TV.

Connecting a regular TV to the VCR Before connecting the VCR to the TV, complete the cable or antenna connections to the VCR. (If you have not already done so.) To connect a regular TV to the VCR: 1. Take the black cable that is supplied with your VCR (called a coaxial cable) and connect it to the ANTENNA terminal on the VCR labeled ANTENNA OUT. 2. Connect the other end of this cable to the terminal on your TV labeled ANTENNA IN. (This terminal may also be labeled VHF IN.) If you have an older TV without this kind of terminal, you will have to use a splitter and then connect the splitter to the television.

-3-

DISASSEMBLY
1. Removal of Top Cover
1. Remove the two Top Cover fastening screws (a) shown in Fig. 1 and remove the Top Cover in the direction shown by arrow.

Top Cover a

2. Removal of Front Panel
1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Unfasten the seven catches (b) shown in Fig. 1 and remove the Front Panel in the direction shown by arrows.

a

b b

b

Front Panel

Fig. 1

-4-

3. Removal of Bottom Panel
1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Remove the two fastening screws (a) shown in Fig. 2. 3. Turn the set upside down as shown in Fig. 3. 4. Slide and lift the Bottom Panel in the direction of the arrows paying attention to the five catches (b) to remove it.

a

Fig. 2

b

Bottom Panel

Fig. 3

-5-

4. Removal of DECK ASSY
1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Remove the Front Panel. (Refer to Para. 2 of the DISASSEMBLY.) 3. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown below. Note: The CAPSTAN MOTOR may be damaged without above short circuit. 4. Remove the two screws (a) shown in Fig. 4. 5. Remove the four screws (b) shown in Fig. 5. 6. Disconnect the Connectors MA, MD, MH and ML. 7. Release the two catches (c) shown in Fig.5 and raise the DECK ASSY to remove it. Note1:Remove the DECK ASSY paying attention to the Connectors MC and MF under it. Note2:Short-circuit the cathode side of D927 and the Shield Plate using the jig shown below before attaching the DECK ASSY.

a

Shield Plate

Fig. 4

Jig (Part No. : 859C548O10) 3W 330

b

DECK ASSY c

Connector MF Connector MC b

Fig. 5

-6-

HOW TO EXECUTE CIRCUIT BOARD SERVICE
CAUTION: BEFORE ATTEMPTING TO REMOVE OR REPAIR ANY PCB, UNPLUG THE POWER CORD FROM THE A.C. SOURCE.

PCB - MAIN

LOCATION OF PRINT CIRCUIT BOARDS
Note : · Take caution when removing flat cables to prevent any contact problem. · Connect and disconnect the flat cables at right angles to the connector and make sure that it is completely secured. · After servicing the PCB, restore the flat cable and leads to their former state.

PCB - OPE

Fig. 6

1. PCB-OPE
1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Remove the Front Panel. (Refer to Para. 2 of the DISASSEMBLY.) 3. Remove the Connector OS. 4. Remove the screw (a) shown in Fig. 7 to remove the PCB-OPE.

Connector OS

a PCB-OPE
Fig. 7

-7-

2. PCB-MAIN
1. Remove the Bottom Panel. (Refer to Para. 3 of the DISASSEMBLY.) 2. Remove the DECK ASSY. (Refer to Para. 4 of the DISASSEMBLY.) 3. Remove the two screws (a) shown in Fig. 8. 4. Remove the Holder for the AC Power Cord from the Base Chassis shown in Fig. 9. 5. Remove the PCB-OPE. (Refer to Para. 1 of the HOW TO EXECUTE CIRCUIT BOARD SERVICE.) 6. Release the two fastening catches (b) shown in Fig. 8. Raise the PCB-MAIN to remove it. 7. Release the three catches (C) shown in Fig. 10 and remove the Antenna Cover.

a

Shield Plate PCB-MAIN

b b

Fig. 8

Holder for the AC Power Cord

J Service of PCB
· Head Amp block 1. Unsolder the four soldering points of the Shield Plate shown in Fig. 8 and remove it. Note: Before checking the operation, mount the Shield Case and the Shield Plate on the original position. If not provided, beat or picture disturbance may appear.

Base chassis
Fig. 9

c Antenna Cover

c

Fig. 10

-8-

CHIP PARTS REPLACEMENT
CHIP PARTS REPLACEMENT
Some resistors, shorting jumpers (0 resistor), ceramic capacitors, transistors and diodes are chip parts. When replacing these parts, note the following cautions.

2. Removal of Chip Parts (Transistors)
A. Melt the solder of one lead. Lift the side of that lead upward. B. Simultaneously melt the solder of the two remaining leads and lift the part from the PCB.

Cautions :
A. Use fine tipped, well insulated soldering pencil (iron), about 30 watts, and tweezers. B. Melt the solder and remove the Chip Parts carefully not to tear off the copper foil of the printed circuit board. C. Discard removed chips ; do not reuse them. D. Do not apply heat for more than 3 seconds to new Chip Parts. E. Avoid using a rubbing stroke when soldering. F. Take care not to scratch, or damage the Chip Parts when soldering. G. Supplementary cementing is not required.

Chip

Lead Pattern Soldering Pencil

Tweezers Chip Pattern PCB

1. Removal of Chip Parts (Resistors, capacitors, etc.)
A. Grasp the part with tweezers. Melt the solder at both sides alternately, remove one side of the part with a twisting motion. B. Melt the solder at the other side and remove the part.

Soldering Pencil Chip Solder

Fig. 2

3. Replacement
A. Presolder the contact points of the circuit pattern. B. Press the part downward with tweezers and apply the soldering pencil as shown in Fig. 3.

Pattern Tweezers

Solder Pattern

Soldering Pencil PCB

Tweezers Chip

Soldering Pencil

Fig. 1

Fig. 3

-9-

MECHANICAL ADJUSTMENT AND REPLACEMENT
1. DECK Cleaning
The following parts require cleaning whenever serviced in order to maintain satisfactory performance.

1-2. Tape Running System
Clean the following parts of the Tape Running System. 1. TENSION PIN 2. F/E HEAD 3. SLANT POLE (SP) 4. SLANT POLE (TU) 5. A/C HEAD 6. GUIDE POLE (TU) 7. PINCH ROLLER 8. GUIDE PIN (TU) 9. GUIDE ROLLER (SP) 10. UPPER / LOWER DRUM ASSY 11. GUIDE ROLLER (TU) 12. CAPSTAN SHAFT 1. Clean the Tape Running System using a piece of gauze dampened with alcohol except for the GUIDE ROLLER (SP), GUIDE ROLLER (TU), and PINCH ROLLER which require to be cleaned with a piece of dry gauze. 2. Allow the residual alcohol to dry thoroughly before running the tape. The residual alcohol on the SYSTEM may damage the tape if not dried completely.

1-1. VIDEO HEAD
1. Clean the VIDEO HEAD according to the following method. Dust and other foreign objects on the VIDEO HEAD disturb the normal PLAYBACK picture. To clean the VIDEO HEAD, hold a VIDEO HEAD cleaning cloth dampened with alcohol against the DRUM and slowly turn the DRUM counter-clockwise. Note : Do not directly touch the HEADS attached to the UPPER DRUM ASSY. The HEADS are very hard but brittle to shock (especially to shock in the vertical direction) and are easily broken. Never apply force to it in the vertical direction. 2. Allow the residual alcohol to dry thoroughly before running a tape. The residual alcohol on the HEADs may damage the tape if not dried completely.

UPPER DRUM ASSY cleaning
Lightly apply the cloth on the UPPER DRUM ASSY. Do not move the cloth. Video Head Cleaning Cloth

1-3. REEL DISK Drive System
1. Clean the BRAKE side and the REEL BELT of the REEL DISK Drive System. 2. Clean the REEL DISK Drive System using a piece of gauze dampened with alcohol except for the REEL BELT which requires cleaning with a piece of dry gauze. 3. Allow the residual alcohol to dry thoroughly before operation.

Fig. 1-1

r e w

t

y q

u

i

o

!0

!1

Fig. 1-2

!2

-1-

2. Replacement of Major Parts
2-1. CLEANING ARM, FELT RING
SET POSITION : Normal

(Removal)
1. Release the two catches (a) of the CLEANING ARM shown in Fig. 2-1 to remove the CLEANING ARM.

a

CLEANING ARM a

(Installation)
1. Install the CLEANING ARM shown in Fig. 2-1.

2-2. STAY PLATE
SET POSITION : Normal Fig. 2-1

(Removal)
1. Remove the two screws (a) fastening the STAY PLATE shown in Fig. 2-2 to remove the STAY PLATE.

a

(Installation)
1. Install the STAY PLATE shown in Fig. 2-2.

STAY PLATE

a

Fig. 2-2

-2-

2-3. BOTTOM ASSY
Hole in MAIN PLATE ASSY
SET POSITION : Normal Remove the following part before replacing the BOTTOM ASSY. Refer to the corresponding item to install it. · STAY PLATE (Item 2-2)

(Removal)
1. Move the WORM WHEEL in Fig. 2-3-1 in the direction shown by arrow A. And match the boss (a) of the BOTTOM ASSY with the hole in the MAIN PLATE ASSY. 2. Lift the BOTTOM ASSY in Fig. 2-3-1 in the direction shown by arrow B and remove in the direction shown by arrow C.

Lift B

a C Pull out BOTTOM ASSY WORM WHEEL A

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the grooves of the MAIN PLATE ASSY shown in Fig. 2-3-2. 2. Apply grease (MULTEMP AC-DM)[859D055O90] to the bosses of the BOTTOM ASSY shown in Fig. 2-32. 3. Rotate the WORM WHEEL shown in Fig. 2-3-1 so that the ARM (SP) stands vertically. 4. Insert the boss (b) of the BOTTOM ASSY shown in Fig. 2-3-2 in the upper groove of the MAIN PLATE and the boss (c) in the lower groove. 5. Insert the boss (d) of the BOTTOM ASSY to the upper groove through the hole in the MAIN PLATE ASSY shown in Fig. 2-3-1 and the boss (e) to the lower groove through the slot in the ARM (SP).

ARM (SP)

Fig. 2-3-1

MAIN PLATE ASSY Groove of MAIN PLATE ASSY Groove of MAIN PLATE ASSY

Side View d e GREASE (MULTEMP AC-DM) ARM (SP)

Side View b c GREASE (MULTEMP AC-DM) ARM (TU)

BOTTOM ASSY
Fig. 2-3-2

-3-

2-4. INSERT GUIDE (TU)
a
DECK POSITION : Normal Remove the following parts before replacing the INSERT GUIDE (TU). Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3)

INSERT GUIDE (TU)

(Removal)
1. Remove the screw (a) fastening the INSERT GUIDE (TU) shown in Fig. 2-4 to remove the INSERT GUIDE (TU).

(Installation)
1. Install the INSERT GUIDE (TU) shown in Fig. 2-4.

Fig. 2-4

2-5. INSERT GUIDE (SP)
DECK POSITION : Normal Remove the following parts before replacing the INSERT GUIDE (SP). Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3)

a INSERT GUIDE (SP)

(Removal)
1. Remove the screw (a) fastening the INSERT GUIDE (SP) shown in Fig. 2-5 to remove the INSERT GUIDE (SP).

(Installation)
1. Install the INSERT GUIDE (SP) shown in Fig. 2-5.

Fig. 2-5

-4-

2-6. REC HOLDER, REC LEVER, REC SPRING
DECK POSITION : Upside down

c REC LEVER

REC SPRING

(Removal)
1. Remove the screw (a) fastening the REC HOLDER shown in Fig. 2-6 to remove the REC HOLDER. 2. Release the REC SPRING shown in Fig. 2-6 from the catch (b) of the REC HOLDER to remove the REC LEVER. 3. Release the two catches (c) of the REC LEVER shown in Fig. 2-6 to remove the REC SPRING.

a REC HOLDER b

(Installation)
1. Install the REC SPRING shown in Fig. 2-6 to the REC LEVER and hook the REC SPRING to the catches (c). 2. Install the REC LEVER shown in Fig. 2-6 to the REC HOLDER. 3. Hook the REC SPRING shown in Fig. 2-6 to the catch (b). 4. Install the REC HOLDER shown in Fig. 2-6.

2-7. F/L ARM ASSY, F/L BEARING
DECK POSITION : Normal Remove the following parts before replacing the F/L ARM ASSY and F/L BEARING. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · INSERT GUIDE (TU) (Item 2-4) · INSERT GUIDE (SP) (Item 2-5) · REC HOLDER (Item 2-6)

Fig. 2-6

MAIN PLATE ASSY GREASE (MULTEMP AC-DM)

(Removal)
1. Release the catch (a) of the F/L BEARING shown in Fig. 2-7 and pull out the F/L ARM ASSY in the direction shown by arrow A. Note : Do not pull the F/L ARM by force because it may break the catch (a) of the F/L BEARING. 2. Release the catch (b) of the F/L BEARING shown in Fig. 2-7 and rotate the F/L BEARING 90 degrees to remove it.

A

F/L ARM ASSY

b

a

F/L BEARING

ARM (SP)

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the groove of the MAIN PLATE ASSY shown in Fig. 27. 2. Apply grease (MULTEMP AC-DM)[859D055O90] to the boss of the ARM (SP) shown in Fig. 2-7. 3. Apply grease (MULTEMP AC-DM)[859D055O90] to the bosses of the ARM (TU) shown in Fig. 2-7. 4. Install the F/L BEARING shown in Fig. 2-7. 5. Insert the boss (c) of the F/L ARM ASSY shown in Fig. 2-7 into the groove (d) of the MAIN PLATE ASSY to install the F/L ARM ASSY.

d GREASE (MULTEMP AC-DM) GREASE (MULTEMP AC-DM) ARM (TU)
Fig. 2-7

c

-5-

2-8. A/C HEAD UNIT
DECK POSITION : Normal

LEAD CONNECTOR a a A/C HEAD UNIT

(Removal)
1. Remove the LEAD CONNECTOR of the A/C HEAD UNIT shown in Fig. 2-8. 2. Remove the two screws (a) fastening the A/C HEAD UNIT shown in Fig. 2-8 to remove the A/C HEAD UNIT.

Head

(Installation)
1. Install the A/C HEAD UNIT shown in Fig. 2-8. Note : Never touch the head of the A/C HEAD UNIT shown in Fig. 2-8. Clean dirt on the head with alcohol, if necessary. 2. Install the LEAD CONNECTOR of the A/C HEAD UNIT shown in Fig. 2-8. 3. Perform "3-3. A/C HEAD Adjustment" and "3-4. Phase Adjustment" of "3. Interchangeability Adjustment of the Mechanism."

Fig. 2-8

2-9. F/E HEAD
A
DECK POSITION : Normal

F/E HEAD

(Removal)
1. Lift the F/E HEAD shown in Fig. 2-9-1 in the direction shown by arrow A to remove it. Note : Be sure to replace the removed F/E HEAD with a new one.

Counterclockwise

(Installation)
1. Install the F/E HEAD shown in Fig. 2-9-1. Note : Never touch the head shown in Fig. 2-9-2. Clean it with alcohol, if necessary.

Fig. 2-9-1

F/E HEAD

Head Part Never touch the Head Part.

Fig. 2-9-2

-6-

2-10.SENSOR COVER (TU)
DECK POSITION : Normal

(Removal)
1. Release the catch (a) of the SENSOR COVER (TU) shown in Fig. 2-10 to remove the SENSOR COVER (TU).

(Installation)
1. Install the SENSOR COVER (TU) shown in Fig. 2-10.

a

SENSOR COVER (TU)

2-11.SENSOR COVER (SP)
DECK POSITION : Normal

Fig. 2-10

(Removal)
1. Remove the catch (a) of the SENSOR COVER (SP) shown in Fig. 2-11 to remove the SENSOR COVER (SP).

(Installation)
1. Install the SENSOR COVER (SP) shown in Fig. 2-11.

a SENSOR COVER (SP)
Fig. 2-11

-7-

2-12.REV UNIT (TU), REV UNIT (SP)
DECK POSITION : Upside down

REV UNIT (TU) a

a REV UNIT (SP) b b

(Removal)
1. Release the two catches (a) of the REV UNIT (TU) shown in Fig. 2-12 to remove the REV UNIT (TU). 2. Release the two catches (b) of the REV UNIT (SP) shown in Fig. 2-12 to remove the REV UNIT (SP).

(Installation)
1. Clean dirt on the transparent part of the REV UNIT (TU) with a VIDEO HEAD cleaning cloth. Note : Never use solvent such as alcohol to clean the REV UNIT (TU). 2. Install the REV UNIT (TU) shown in Fig. 2-12. 3. Clean dirt on the transparent part of the REV UNIT (SP) with a VIDEO HEAD cleaning cloth. Note : Never use solvent such as alcohol to clean the REV UNIT (SP). 4. Install the REV UNIT (SP) shown in Fig. 2-12.

Fig. 2-12

2-13.MODE POSITION UNIT
DECK POSITION: Upside down

(Removal)
1. Release the two catches (a and b) of the MODE POSITION UNIT shown in Fig. 2-13 to remove the MODE POSITION UNIT.

(Installation)
1. Install the catch (b) of the MODE POSITION UNIT shown in Fig. 2-13. 2. Install the catch (a) of the MODE POSITION UNIT shown in Fig. 2-13.

MODE POSITION UNIT a b

Fig. 2-13

-8-

2-14.REEL BELT, PULLEY BUSH, THRUST WASHER, BELT PULLEY, SHIFT SLIDER, PULLEY GEAR ASSY, SLIP GEAR, SLIP SPRING, SLIP WASHER, THRUST WASHER, SLIP ADJUSTER, IDLER 2 UNIT
DECK POSITION : Upside down

REEL BELT a PULLEY BUSH

THRUST WASHER BELT PULLEY

(Removal)
1. Remove the REEL BELT shown in Fig. 2-14-1. 2. Move the SHIFT SLIDER in Fig. 2-14-1 in the direction shown by arrow A to remove the SHIFT SLIDER from the SHIFT LEVER. 3. Release the two catches (a) of the PULLEY BUSH shown in Fig. 2-14-1 to remove the PULLEY BUSH. Note : Be sure to replace the removed PULLEY BUSH with a new one. 4. Remove the units from the THRUST WASHER to the IDLER 2 UNIT shown in Fig. 2-14-1.

A of arrow A to

Pull in the direction remove it from the SHIFT LEVER.

SHIFT SLIDER PULLEY GEAR ASSY SLIP GEAR SLIP SPRING SLIP WASHER THRUST WASHER

GREASE (PG-641)

(Installation)
Note : Be careful not to apply grease and oil to the felt side of the PULLEY GEAR ASSY or the grooved side of the SLIP GEAR shown in Fig. 2-14-4. 1. Apply oil (FLOIL 948P) [859D154O20] to the SHAFT for the IDLER 2 UNIT shown in Fig. 2-14-1. 2. Apply grease (PG-641) [859D055O30] to the specified parts on the IDLER 2 UNIT in Fig. 2-14-1. 3. Apply grease (MULTEMP AC-DM) [859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-14-1. 4. Apply grease (PG-641) [859D055O30] to the specified parts on the new SHIFT SLIDER in Fig. 2-14-2. 5. Apply grease (PG-641) [859D055O30] to the specified parts on the new SLIP ADJUSTER in Fig. 2-14-2. 6. Apply grease (PG-641) [859D055O30] to the specified parts on the new BELT PULLEY in Fig. 2-14-3. 7. Install the IDLER 2 UNIT shown in Fig. 2-14-1. 8. Install the SLIP ADJUSTER shown in Fig. 2-14-3, aligning the lug of the SLIP ADJUSTER with the center notch of the IDLER 2 UNIT.

SLIP ADJUSTER GREASE (PG-641) IDLER 2 UNIT

OIL (FLOIL 948P)

GREASE (MULTEMP AC-DM) SHIFT LEVER
Fig. 2-14-1

SLIP ADJUSTER

SHIFT SLIDER

Apply grease (PG-641) to the parts marked by
Fig. 2-14-2

.

-9-

9. Install the units from the SLIP WASHER to the REEL BELT shown in Fig. 2-14-1. Note1 : Be sure to replace the removed PULLEY BUSH with a new one. Note2 : Attach the SLIP SPRING with its straight end facing the SLIP GEAR side. Note3 : Attach the SLIP WASHER in the orientation shown in Fig. 2-14-5. Note4 : Apply grease (PG-641) [859D055O30] to the specified part on the SLIP WASHER in Fig. 2-145. 10. Install the SHIFT SLIDER to the SHIFT LEVER shown in Fig. 2-14-1.

SLIP ADJUSTER Center of the BELT PULLEY

Align the Lug of the IDLER UNIT SLIP ADJUSTER with Apply grease the Center Notch of (PG-641) to the the IDLER UNIT. parts marked by
Fig. 2-14-3

.

PULLEY GEAR ASSY Felt Side

SLIP GEAR Grooved Side

Fig. 2-14-4

[SLIP GEAR side] Straight end

SLIP SPRING

SLIP WASHER

[THRUST WASHER side] Apply grease (PG-641) to the parts marked by Fig. 2-14-5 .

- 10 -

2-15.CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY
DECK POSITION : Upside down

CAPSTAN BRAKE ASSY a

(Removal)
1. Remove the CAPSTAN BRAKE SPRING shown in Fig. 2-15. 2. Remove the catch (a) of the CAPSTAN BRAKE ASSY shown in Fig. 2-15 to remove the CAPSTAN BRAKE ASSY.

CAPSTAN MOTOR CAPSTAN BRAKE SPRING

(Installation)
1. Install the CAPSTAN BRAKE ASSY shown in Fig. 215. 2. Install the CAPSTAN BRAKE SPRING shown in Fig. 2-15.

Fig. 2-15

- 11 -

2-16.FC HOLDER, MOTOR HOLDER, LOADING WORM, LOADING MOTOR ASSY, WORM WHEEL
DECK POSITION : Normal

LOADING MOTOR ASSY b b a a LOADING WORM

(Removal)
1. Release the two catches (a) of the FC HOLDER shown in Fig. 2-16-1 to remove the FC HOLDER. 2. Remove the two screws (b) fastening the MOTOR HOLDER shown in Fig. 2-16-1 to remove the MOTOR HOLDER. 3. Remove the two screws (c) fastening the LOADING MOTOR ASSY shown in Fig. 2-16-1 to remove the LOADING MOTOR ASSY and LOADING WORM. 4. Remove the WORM WHEEL.

FC HOLDER

MOTOR HOLDER c LUG TERMINAL

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the LOADING WORM shown in Fig. 2-16-2. 2. Apply grease (MULTEMP AC-DM)[859D055O90] to the WORM WHEEL shown in Fig. 2-16-2. 3. Install the WORM WHEEL. 4. Install the LOADING WORM and LOADING MOTOR ASSY to the MOTOR HOLDER. Note : Tighten the screw (c) shown in Fig. 2-16-1 after putting the LUG TERMINAL on the screw. 5. Install the MOTOR HOLDER. 6. Install the FC HOLDER.

WORM WHEEL

Fig. 2-16-1

WORM WHEEL

LOADING WORM

Apply grease (MULTEMP AC-DM) to the parts marked by . Fig. 2-16-2

- 12 -

2-17.PINCH ARM CAP, PINCH UNIT
DECK POSITION : Normal

a PINCH ARM CAP Part B Part A PINCH UNIT

(Removal)
1. Release the two catches (a) of the PINCH ARM CAP shown in Fig. 2-17 to remove the PINCH ARM CAP. 2. Remove the PINCH UNIT shown in Fig. 2-17.

(Installation)
1. Insert Part A of the PINCH UNIT shown in Fig. 2-17 in the most external groove of the MAIN CAM. 2. Install the PINCH ARM CAP aligning Part B of the PINCH ARM CAP with the rib of the MAIN PLATE ASSY.

MAIN CAM Rib

2-18.F/L PLATE, DOOR ARM
DECK POSITION : Normal Remove the following parts before replacing the F/L PLATE and DOOR ARM. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · SENSOR COVER (TU) (Item 2-10) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17)

Fig. 2-17

MAIN CAM

GREASE (MULTEMP AC-DM) F/L PLATE GREASE (MOLYKOTE G PASTE)

DOOR ARM

(Removal)
1. Slightly lift the back of the F/L PLATE (MAIN CAM side) shown in Fig. 2-18-1 to remove the F/L PLATE. 2. Remove the DOOR ARM.

Back ARM (TU) GREASE (MOLYKOTE G PASTE) GREASE (MULTEMP AC-DM)

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the new F/L PLATE in Fig. 2-181. 2. Apply grease (MOLYKOTE G PASTE) [859D055O50] to the specified parts on the new F/L PLATE in Fig. 218-1.

MAIN PLATE ASSY GREASE (MULTEMP AC-DM)

Fig. 2-18-1

- 13 -

3. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-18-1. 4. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the DOOR ARM in Fig. 2-18-1. 5. Install the DOOR ARM. 6. Align the hole in the MAIN CAM with the hole in the MAIN PLATE ASSY shown in Fig. 2-18-2. 7. Install the F/L PLATE shown in Fig. 2-18-1 from the front side (ARM (TU) side). 8. Insert the boss of the F/L PLATE shown in Fig. 2-18-2 into the groove of the MAIN CAM.

Hole

MAIN CAM F/L PLATE

Boss
Fig. 2-18-2

2-19.BRAKE CAM PLATE
DECK POSITION : Normal Remove the following parts before replacing the BRAKE CAM PLATE. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17)

BRAKE CAM PLATE a MAIN CAM

b b

B A

(Removal)
1. Release the boss of the F/L PLATE from the groove in the MAIN CAM by lifting the F/L PLATE shown in Fig. 2-18-2. 2. Rotate the MAIN CAM in Fig. 2-19-1 in the direction shown by arrow A. Move the BRAKE CAM PLATE so that the three catches (a) of the MAIN PLATE ASSY can be released. 3. Remove the BRAKE CAM PLATE.

b a b a
Fig. 2-19-1

(Installation)
1. Apply grease (MOLYKOTE G PASTE) [859D055O50] to the specified parts on the BRAKE CAM PLATE in Fig. 2-19-2. 2. Hook the BRAKE SPRING shown in Fig. 2-19-3 to the catch of the BRAKE (TU). 3. Install the BRAKE CAM PLATE, inserting the six guide pins (b) shown in Fig. 2-19-1 into the slits of the BRAKE CAM PLATE. 4. Move the BRAKE SPRING in Fig. 2-19-3 in the direction shown by arrow C to release the catch of the BRAKE (TU) and insert the BRAKE SPRING under the catch.

BRAKE CAM PLATE Back Back 70 mm 40 mm

Back

99 mm 130 mm

Back

Apply grease (MOLYKOTE G PASTE) to the points marked by .
Fig. 2-19-2

- 14 -

5. Rotate the MAIN CAM shown in Fig. 2-19-1 in the direction shown by arrow B. Move the BRAKE CAM PLATE to hook it to the three catches (a) of the MAIN PLATE ASSY. 6. Put the boss of the F/L PLATE back into the groove in the MAIN CAM shown in Fig. 2-18-2.

BRAKE SPRING C Insert the BRAKE SPRING under the Catch. Catch

BRAKE (TU)
Fig. 2-19-3

2-20.GUIDE LAMP
DECK POSITION : Normal Remove the following parts before replacing the GUIDE LAMP. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19)

c MAIN PLATE ASSY

(Removal)
1. Release the catch (a) of the GUIDE LAMP shown in Fig. 2-20. 2. Rotate the GUIDE LAMP in the direction shown by arrow A (counterclockwise when viewed from the bottom) to align the longest slit (c) of the MAIN PLATE ASSY with the longest arm (b) of the GUIDE LAMP shown in Fig. 2-20. Pull it out downward to remove it.

GUIDE LAMP a A Removing Direction
Fig. 2-20

b B Installing Direction

(Installation)
1. Clean dirt on the GUIDE LAMP with a VIDEO HEAD cleaning cloth. Note: Never use solvent such as alcohol to clean the GUIDE LAMP. 2. Insert the GUIDE LAMP in Fig. 2-20, aligning the longest arm (b) of the GUIDE LAMP with the longest slit (c) of the MAIN PLATE ASSY. 3. Rotate the GUIDE LAMP in the direction shown by arrow B (clockwise when viewed from the bottom) to align the arm (a) of the GUIDE LAMP shown in Fig. 2-20 with the longest slit (c) of the MAIN PLATE ASSY. Note : If the GUIDE LAMP still has dirt after installation,

- 15 -

2-21.MAIN CAM, GUIDE ARM (TU), BRAKE LEVER, LB PIN
DECK POSITION : Normal Remove the following parts before replacing the MAIN CAM, GUIDE ARM (TU), and LEVER. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · SENSOR COVER (TU) (Item 2-10) · MOTOR HOLDER (Item 2-16) · WORM WHEEL (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · F/L PLATE (Item 2-18) · BRAKE CAM PLATE (Item 2-19)

MAIN CAM

Follower pin BRAKE LEVER A GREASE (MULTEMP AC-DM)

a

GUIDE ARM (TU) LB PIN Follower pin of the CAPSTAN BRAKE ASSY

B

(Removal)
1. Remove the MAIN CAM shown in Fig. 2-21-1. 2. Remove the GUIDE ARM (TU) shown in Fig. 2-21-1. 3. Move the BRAKE LEVER in Fig. 2-21-1 in the direction shown by arrow A and release the catch (a) to remove the BRAKE LEVER. 4. Remove the LB PIN shown in Fig. 2-21-1.

Back GREASE (MULTEMP AC-DM)
Fig. 2-21-1

MAIN PLATE ASSY

(Installation)
1. Install the LB PIN shown in Fig. 2-21-1. 2. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the new GUIDE ARM (TU) in Fig. 2-21-1. 3. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-21-1. 4. Install the GUIDE ARM (TU), aligning the hole in the GUIDE ARM (TU) shown in Fig. 2-21-2 with the hole in the MAIN PLATE ASSY. Note : Install the GUIDE ARM (TU) so that the part specified with oblique lines of the GUIDE ARM (TU) is positioned under the shaft flange of the PINCH UNIT. 5. Install the BRAKE LEVER shown in Fig. 2-21-2 so that the hole in the BRAKE LEVER overlaps the hole in the MAIN PLATE ASSY. 6. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the new MAIN CAM in Fig. 2-21-3. 7. Install the MAIN CAM so that the hole in the MAIN CAM shown in Fig. 2-21-2 overlaps with the hole in the MAIN PLATE ASSY. Note : Install the MAIN CAM, inserting the follower pins of the CAPSTAN BRAKE ASSY, GUIDE ARM (TU), and BRAKE LEVER into the grooves on the back of the MAIN CAM. Set the Main Cam while pulling the follower pin of the CAPSTAN BRAKE ASSY in the direction shown by arrow B (toward the deck front) using tweezers as shown in Fig. 2-21-1. Be careful not to apply grease to the wall when applying it to the most external circle on the back of the MAIN CAM (4 parts) shown in Fig. 2-21-3. - 16 -

MAIN PLATE ASSY

Hole

MAIN CAM GUIDE ARM (TU) Part with Oblique Lines Hole BRAKE LEVER

SHAFT FLANGE of the PINCH UNIT

Fig. 2-21-2

MAIN CAM Front Back

Wall

Apply grease (MULTEMP AC-DM) to the parts marked by . Fig. 2-21-3

2-22.L/D LOCK LEVER
DECK POSITION : Normal Remove the following parts before replacing the L/D LOCK LEVER. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19)

L/D LOCK LEVER

(Removal)
1. Remove the L/D LOCK LEVER shown in Fig. 2-22.

(Installation)
1. Install the L/D LOCK LEVER shown in Fig. 2-22.

2-23.BRAKE BELT (SP), BELT HOLDER
DECK POSITION : Normal Remove the following parts before replacing the BRAKE BELT (SP) and BELT HOLDER. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3)

Fig. 2-22
b c

BELT HOLDER

(Removal)
1. Lift the BRAKE BELT (SP) shown in Fig. 2-23 to remove it from the REEL DISK (SP side). 2. Release the BRAKE BELT (SP) from the catch (a) of the BELT LEVER shown in Fig. 2-23. 3. Release the two catches (b) of the BELT HOLDER shown in Fig. 2-23 and separate the BELT HOLDER from the BRAKE BELT (SP). 4. Release the catch (c) of the BELT HOLDER shown in Fig. 2-23 to remove the BRAKE BELT (SP).

BRAKE BELT (SP)

BELT LEVER
a

(Installation)
Note : Install the BRAKE BELT (SP) so that its felt side touches the REEL DISK (SP side). Grease applied to the BRAKE CAM PLATE and MAIN PLATE ASSY shall not adhere to the felt side of the BRAKE BELT (SP). 1. Hook the BRAKE BELT (SP) shown in Fig. 2-23 to the catch (c) of the BELT HOLDER. 2. Install the BELT HOLDER shown in Fig. 2-23. 3. Hook the BRAKE BELT (SP) shown in Fig. 2-23 to the catch (a) of the BELT LEVER. 4. Hook the BRAKE BELT (SP) shown in Fig. 2-23 to the REEL DISK (SP side).

REEL DISK (SP side)
Fig. 2-23

- 17 -

2-24. BELT LEVER, BELT ADJUSTER
DECK POSITION : Normal Remove the following parts before replacing the BELT LEVER and BELT ADJUSTER. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · BRAKE BELT (SP) (Item 2-23) · BELT HOLDER (Item 2-23)

a

BELT LEVER

BELT ADJUSTER

(Removal)
1. Release the catch (a) of the BELT LEVER shown in Fig. 2-24 to remove the BELT LEVER. 2. Remove the BELT ADJUSTER shown in Fig. 2-24.

(Installation)
1. Install the BELT ADJUSTER shown in Fig. 2-24. 2. Install the BELT LEVER shown in Fig. 2-24.

2-25 TENSION ARM, TENSION LEVER, TENSION SPRING, TENS AXIS HOLDER, REEL DISK (SP side)
DECK POSITION : Normal Remove the following parts before replacing the abovementioned components. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · BRAKE BELT (SP) (Item 2-23) · BELT HOLDER (Item 2-23) · BELT LEVER (Item 2-24)

Fig. 2-24

TENSION ARM

REEL DISK (SP side) THRAUST WASHER

TENSION SPRING a A b TENS AXIS HOLDER

TENSION LEVER

(Removal)
1. Remove the TENSION SPRING shown in Fig. 2-25. 2. Release the catch (a) of the TENS AXIS HOLDER shown in Fig. 2-25 to remove the TENSION ARM. 3. Remove the TENSION LEVER shown in Fig. 2-25. 4. Release the catch (b) of the TENS AXIS HOLDER shown in Fig. 2-25. Move the TENS AXIS HOLDER in the direction shown by arrow A to remove it. 5. Remove the REEL DISK (SP side).

MAIN PLATE ASSY
Fig. 2-25

GREASE (MULTEMP AC-DM)

- 18 -

(Installation)
1. Apply grease (MULTEMP AC-DM) [859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-25. 2. Install the REEL DISK (SP side). 3. Install the TENS AXIS HOLDER. Note : Install the TENS AXIS HOLDER so that the catch (a) for the TENSION ARM is positioned on the front (F/L ARM ASSY side). 4. Install the TENSION LEVER. 5. Install the TENSION ARM. 6. Install the TENSION SPRING. Note : Install the longer hook of the TENSION SPRING to the TENSION ARM.

2-26.BRAKE BELT (TU)
DECK POSITION : Normal Remove the following parts before replacing the BRAKE BELT. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3)

BRAKE BELT (TU)

BRAKE (TU) a a

(Removal)
1. Lift the BRAKE BELT (TU) shown in Fig. 2-26 to remove it from the REEL DISK (TU side). 2. Release the two catches (a) of the BRAKE (TU) shown in Fig. 2-26 to remove the BRAKE BELT (TU).

(Installation)
1. Install the BRAKE BELT (TU) shown in Fig. 2-26 to the BRAKE (TU). 2. Hook the BRAKE BELT (TU) shown in Fig. 2-26 to the REEL DISK (TU side). Note : Install the BRAKE BELT (TU) so that its felt side touches the REEL DISK (TU side).

REEL DISK (TU side)
Fig. 2-26

BRAKE BELT (TU)

2-27.BRAKE (TU), REEL DISK (TU side)
DECK POSITION : Normal Remove the following parts before replacing the BRAKE (TU) and REEL DISK (TU side). Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19)

REEL DISK (TU side) BRAKE (TU) A

WASHER MAIN PLATE ASSY

(Removal)
1. Move the BRAKE (TU) in Fig. 2-27 in the direction shown by arrow A to remove it. 2. Remove the BRAKE BELT (TU) from the BRAKE (TU). 3. Remove the REEL DISK (TU).

GREASE (MULTEMP AC-DM) Fig. 2-27

- 19 -

(Installation)
Note : Install the BRAKE BELT (TU) so that its felt side touches the REEL DISK (TU side). The grease applied to the BRAKE CAM PLATE and the MAIN PLATE ASSY shall not adhere to the felt side of the BRAKE BELT (SP). 1. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-27. 2. Install the REEL DISK (TU side). 3. Install the BRAKE BELT (TU) to the BRAKE (TU). 4. Install the BRAKE (TU). 5. Hook the BRAKE BELT (TU) to the REEL DISK (TU side).

2-28.SHIFT LEVER
DECK POSITION : Normal Remove the following parts before replacing the SHIFT LEVER. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · BRAKE (TU) (Item 2-27) · REEL DISK (TU side) (Item 2-27)

Back SHIFT LEVER

a

B Back

(Removal)
1. Move the SHIFT SLIDER in Fig. 2-28 in the direction shown by arrow A to release it from the SHIFT LEVER. 2. Move the SHIFT LEVER in Fig. 2-28 in the direction shown by arrow B to remove it.

A SHIFT SLIDER

Back

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the new SHIFT LEVER in Fig. 2-28. 2. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-28. 3. Install the SHIFT LEVER so that Part (a) shown in Fig. 2-28 is positioned under the MAIN PLATE ASSY. 4. Install the SHIFT SLIDER to the SHIFT LEVER.

MAIN PLATE ASSY Apply grease (MULTEMP AC-DM) to the parts marked by .
Fig. 2-28

- 20 -

2-29.CHARGE SPRING, SWING LEVER, CHARGE ASSY
DECK POSITION : Normal Remove the following parts before replacing the CHARGE SPRING, SWING LEVER, and CHARGE ASSY. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19)

CHARGE SPRING c

a

CHARGE ASSY

SWING LEVER b Front Back Both Sides (Front/Back)

(Removal)
1. Remove the CHARGE SPRING shown in Fig. 2-29 from the SWING LEVER. 2. Remove the SWING LEVER shown in Fig. 2-29. 3. Release Part a of the CHARGE ASSY shown in Fig. 2-29 from Part b of the MAIN PLATE ASSY to remove the CHARGE ASSY.

MAIN PLATE ASSY REEL DISK (SP side) Fig. 2-29

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-29. 2. Install the CHARGE ASSY. 3. Install the SWING LEVER, inserting Part c of the SWING LEVER in Fig. 2-29 into the groove in the MAIN PLATE ASSY. 4. Install the CHARGE SPRING to the SWING LEVER.

2-30.SPACER PLATE, LOADING ARM ASSY (SP), LOADING ARM ASSY (TU)
DECK POSITION : Upside down

b SPACER PLATE LOADING ARM ASSY (TU)

(Removal)
1. Release the catch (a) of the LOADING ARM ASSY (SP) shown in Fig. 2-30-1 to remove the LOADING ARM ASSY (SP). Note : Be sure to replace the removed LOADING ARM ASSY (SP) with a new one. 2. Remove the screw (b) fastening the SPACER PLATE shown in Fig. 2-30-1 to remove the SPACER PLATE. 3. Remove the LOADING ARM ASSY (TU) shown in Fig. 2-30-1.

LOADING ARM a ASSY (SP)

MAIN PLATE ASSY

GREASE (MULTEMP AC-DM)
Fig. 2-30-1

- 21 -

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-30-1. 2. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the LOADING ARM ASSY (TU) in Fig. 2-30-2. 3. Install the LOADING ARM ASSY (SP) and LOADING ARM ASSY (TU) so that the marks on both the units are aligned each other as shown in Fig. 2-30-3. Note : Be sure to replace the removed LOADING ARM ASSY (SP) with a new one. 4. Install the SPACER PLATE shown in Fig. 2-30-1.

LOADING ARM ASSY (TU)

Apply grease (MULTEMP AC-DM) to the parts marked by .
Fig. 2-30-2

LOADING ARM ASSY (TU)

Mark

LOADING ARM ASSY (SP)

Fig. 2-30-3

2-31.A/L LEVER
CUT WASHER
DECK POSITION: Upside down Remove the following parts before replacing the A/L LEVER. Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · LOADING ARM ASSY (SP) (Item 2-30) · LOADING ARM ASSY (TU) (Item 2-30)

A/L LEVER WASHER

(Removal)
1. Remove the CUT WASHER and WASHER shown in Fig. 2-31-1. Then, remove the A/L LEVER.

MAIN PLATE ASSY

GREASE (MOLYKOTE G PASTE)
Fig. 2-31-1

- 22 -

(Installation)
Note : Install the LOADING ARM ASSY (TU) and LOADING ARM ASSY (SP) in accordance with the following procedure after installing the A/L LEVER. 1. Apply grease (MOLYKOTE G PASTE) [859D055O50] to the specified parts on the MAIN PLATE ASSY in Fig. 2-31-1. 2. Apply grease (MOLYKOTE G PASTE) [859D055O50] to the specified parts on the A/L LEVER in Fig. 2-312. 3. Install the A/L LEVER so that the mark on the A/L LEVER faces to the flange of the LOADING ARM ASSY (SP) as shown in Fig. 2-31-3. Note : The part specified with oblique lines on the A/L LEVER shall be positioned under the flange of the LOADING ARM ASSY (SP). 4. Install the LOADING ARM ASSY (TU) so that the marks on the LOADING ARM ASSY (TU) and the A/L LEVER are aligned each other as shown in Fig. 2-314. 5. Install the LOADING ARM ASSY (SP) so that the mark on the LOADING ARM ASSY (SP) and the reinforcement rib of the LOADING ARM ASSY (TU) are aligned each other as shown in Fig. 2-31-4. Note : Be sure to replace the removed LOADING ARM ASSY (SP) with a new one.

A/L LEVER

Back

Apply grease (MOLYKOTE G PASTE) to the parts marked by . Fig. 2-31-2 Flange of LOADING ARM ASSY (SP)

A/L LEVER

Boss

Mark
Fig. 2-31-3

Part with Oblique Lines

LOADING ARM ASSY (TU)

LOADING ARM ASSY (SP)

Reinforcement Rib Mark

A/L LEVER

Mark
Fig. 2-31-4

- 23 -

2-32.TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU)
DECK POSITION : Normal Remove the following parts before replacing the TAPE GUIDE ASSY (SP) and (TU). Refer to the corresponding items to install them. · STAY PLATE (Item 2-2) · BOTTOM ASSY (Item 2-3) · MOTOR HOLDER (Item 2-16) · PINCH ARM CAP (Item 2-17) · PINCH UNIT (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · BRAKE BELT (SP) (Item 2-23) · BELT HOLDER (Item 2-23) · BELT LEVER (Item 2-24) · TENSION ARM (Item 2-25) · SPACER PLATE (Item 2-30) · LOADING ARM ASSY (TU) (Item 2-30) · LOADING ARM ASSY (SP) (Item 2-30) · A/L LEVER (Item 2-31)

TAPE GUIDE ASSY (TU) TAPE GUIDE ASSY (SP)

Fig. 2-32-1

GUIDE CATCHER (SP) GUIDE CATCHER (TU)

(Removal)
1. Loosen the TAPE GUIDE ASSY (SP) shown in Fig. 232-1 (turn it fully in the unloading direction) to remove it. 2. Loosen the TAPE GUIDE ASSY (TU) shown in Fig. 232-1 (turn it fully in the unloading direction) to remove it.

(Installation)
1. Apply grease (MULTEMP AC-DM)[859D055O90] to the specified parts on the MAIN PLATE ASSY in Fig. 2-32-2. 2. Install the TAPE GUIDE ASSY (SP) shown in Fig. 232-1. 3. Install the TAPE GUIDE ASSY (TU) shown in Fig. 232-1. 4. Perform from "3-2-1. GUIDE ROLLER Adjustment Check" to "3-2-5. Flatness Check of FM Waveform" of "3. Interchangeability Adjustment of the Mechanism."

Front of Back of MAIN PLATE ASSY MAIN PLATE ASSY Apply grease (MULTEMP AC-DM) to the parts marked by .
Fig. 2-32-2

- 24 -

2-33.DRUM CLAMPER, DRUM ASSY
DECK POSITION : Normal

LEAD CONNECTOR a DRUM ASSY with DRUM CLAMPER b

(Removal)
1. Disconnect the LEAD CONNECTOR of the DRUM ASSY shown in Fig. 2-33-1. 2. Remove the two screws (a and b) fastening the DRUM CLAMPER shown in Fig. 2-33-1 to remove the DRUM ASSY with the DRUM CLAMPER. 3. Rotate the DRUM CLAMPER in Fig. 2-33-2 in the direction shown by arrow A to remove it from the DRUM ASSY.

(Installation)
1. Install the DRUM CLAMPER in Fig. 2-33-2 to the DRUM ASSY by rotating it in the direction shown by arrow B. 2. Hook the catch of the DRUM CLAMPER shown in Fig. 2-33-3 to the reference pin. 3. Fasten the screw (b) while pushing Part A in the direction shown by arrow C (clockwise when viewed from the top) as shown in Fig. 2-33-3. Note : Make sure that the catch of the DRUM CLAMPER touches the side of the reference pin. 4. Fasten the screw (a) shown in Fig. 2-33-3. Note : Make sure that the catch of the DRUM CLAMPER touches the side of the reference pin. 5. Connect the LEAD CONNECTOR of the DRUM ASSY with the DRUM CLAMPER shown in Fig. 2-33-1. 6. Perform "3. Interchangeability Adjustment of the Mechanism." 7. Perform the Playback Switching Point adjustment referring to the Circuit Adjustment section. 8. Clean the DRUM ASSY shown in Fig. 2-33-1 with alcohol.

MAIN PLATE ASSY
Fig. 2-33-1

Removing Installing DRUM CLAMPER Direction Direction A B

Hook here to attach DRUM CLAMPER to DRUM ASSY.

DRUM ASSY
Fig. 2-33-2

b a Part A

C

Reference Pin Reference Pin and Catch have to touch each other. Catch
Fig. 2-33-3 - 25 -

2-34.DRUM MOTOR STATOR, BRUSH SPRING, SPACER, ROTOR CASE, END RING, BRUSH, UPPER DRUM ASSY
DECK POSITION : Normal

Side View of END RING a This side down. DRUM MOTOR STATOR LEAD CONNECTOR b ROTOR CASE END RING b BRUSH SPRING

(Removal)
1. Disconnect the LEAD CONNECTOR of the DRUM ASSY shown in Fig. 2-34-1. 2. Remove the two screws (a) fastening the DRUM MOTOR STATOR shown in Fig. 2-34-1 to remove the DRUM MOTOR STATOR. 3. Remove the two screws (b) fastening the ROTOR CASE shown in Fig. 2-34-1 to remove the ROTOR CASE. Note : Mark the END RING and the UPPER DRUM ASSY shown in Fig. 2-34-1 for ensuring correct positioning in re-assembly. 4. Loosen the hexagon screw (c) fastening the END RING shown in Fig. 2-34-1 to remove the END RING. 5. Remove the BRUSH SPRING shown in Fig. 2-34-1. 6. Remove the BRUSH shown in Fig. 2-34-1. 7. Remove the UPPER DRUM ASSY shown in Fig. 2-341. 8. Remove the SPACER shown in Fig. 2-34-1.

BRUSH

c

UPPER DRUM ASSY Mark for ensuring correct positioning in re-assembly.

SPACER LOWER DRUM ASSY

Fig. 2-34-1

- 26 -

(Installation)
1. Install the SPACER shown in Fig. 2-34-1. Note : Be sure to use a new SPACER supplied with the new UPPER DRUM ASSY. 2. Install the UPPER DRUM ASSY shown in Fig. 2-34-1. 3. Install the END RING so that the reference hole (A) of the END RING shown in Fig. 2-34-2 is positioned in parallel with the rear line of the MAIN PLATE ASSY. (The reference hole (A) shall be on the right when viewed from the bottom.) 4. Apply the screw-sealing agent to the hexagon screw (c) fastening the END RING shown in Fig. 2-34-1. 5. Install the ROTOR CASE shown in Fig. 2-34-3, aligning its holes with the three reference holes (B) of the UPPER DRUM ASSY. 6. Install the BRUSH shown in Fig. 2-34-1. 7. Install the BRUSH SPRING shown in Fig. 2-34-1. 8. Install the DRUM MOTOR STATOR shown in Fig. 234-1. 9. Connect the LEAD CONNECTOR of the DRUM ASSY shown in Fig. 2-34-1. 10. Perform "3. Interchangeability Adjustment of the Mechanism." 11. Perform the Playback Switching Point adjustment referring to the Circuit Adjustment section. 12. Clean the DRUM ASSY with alcohol.

A END RING Rear Line of MAIN PLATE ASSY
Fig. 2-34-2

ROTOR CASE

B UPPER DRUM ASSY
Fig. 2-34-3

Lock

2-35.CAPSTAN MOTOR
DECK POSITION : Normal Remove the following part before replacing the CAPSTAN MOTOR. Refer to the corresponding item to install it. · REEL BELT (Item 2-14.)

Lock STAY PLATE WORM WHEEL

(Removal)
1. Rotate the WORM WHEEL in Fig. 2-35-1 in the direction shown by arrow A to release the hooks of the BOTTOM ASSY from the locks of the STAY PLATE.

A

Hook of BOTTOM ASSY Fig. 2-35-1

- 27 -

2. Rotate the WORM WHEEL in Fig. 2-35-2 in the direction shown by arrow A so that the GUIDE ARM (TU) moves in the direction of arrow B and expose the three screws (a) fastening the CAPSTAN MOTOR. 3. Remove the three screws (a) fastening the CAPSTAN MOTOR shown in Fig. 2-35-2 to remove the CAPSTAN MOTOR.

a

WORM WHEEL A

(Installation)
1. Apply silicon compound (SC102) [859D164O10] to the specified parts on the MAIN PLATE ASSY in Fig. 2-35-3. 2. Install the CAPSTAN MOTOR.

GUIDE ARM (TU) Arrow B

CAPSTAN MOTOR

Fig. 2-35-2

SILICON COMPOUND (SC102) MAIN PLATE ASSY
Fig. 2-35-3

- 28 -

3. Interchangeability Adjustment of the Mechanism
Note 1 : Tracking may need to be preset during interchangeability adjustment of the mechanism. Digital tracking is preset by short circuiting TP5A and TP5B on the PCB-MAIN. Note 2 : When performing the adjustments in the PLAYBACK mode, use the staircase signal of an alignment tape, unless otherwise specified. Connect an oscilloscope with TP2A (FM waveform) and externally trigger from TP2H.

TENSION ARM

TENSION POLE

3-1. Adjustment of BACK TENSION and TENSION POLE's Position
Run a blank tape for several minutes to break in the REEL DISKs and the Tape Running System before the adjustment. 1. Play back a dummy Tape. 2. Confirm that "A", the distance between the holes in the TENSION ARM and the MAIN PLATE ASSY shown in Fig. 3-1-1, is 0.3±0.3 mm. 3. If "A" is not 0.3±0.3 mm, move the hole in the BELT ADJUSTER in Fig. 3-1-2 within the range shown by arrow A to set "A" to 0.3±0.3 mm. 4. Set the BACK TENSION measuring jig (code: 859C345O80) and play back the tape. 5. Confirm that "A" shown in Fig. 3-1-1 is 0.0±0.5 mm. 6. If "A" is not 0.0±0.5 mm, repeat this adjustment from the beginning. 7. Make sure that the indicated value of the BACK TENSION measuring jig is within 5.4±0.59 mNm. Note 1 : Check the indicated value of the BACK TENSION measuring jig after the tape running condition becomes steady. Note 2 : Replace the TENSION SPRING if the indicated value exceeds the specified value. 8. While the tape is running steadily, check visually that the vibration range of the TENSION POLE is 1 mm or less. If the vibration range exceeds 1 mm, replace the REEL DISK.

A

BELT ADJUSTER
Fig. 3-1-1

A

Hole BELT ADJUSTER
Fig. 3-1-2

- 29 -

3-2. Check and Adjustment of the FM Envelope
3-2-1. GUIDE ROLLER Adjustment Check
1. Play back an alignment tape (NM6KE2 : 859C339O90). 2. Preset the tracking. 3. Make sure that the FM waveform is flat as shown by Waveform (A). 4. Perform "3-2-2. Height Adjustment of GUIDE ROLLER (SP)" if the leading edge (the DRUM entry side) of the FM waveform is not flat as shown by Waveform (B) and (C). Perform "3-2-3. Height Adjustment of GUIDE ROLLER (TU)" if the trailing edge (the DRUM exit side) is not flat as shown by Waveform (D) and (E)

(A)

(B)

3-2-2. Height Adjustment of GUIDE ROLLER (SP)
1. Loosen the height adjustment screw at the top of the GUIDE ROLLER (SP) so that the GUIDE ROLLER (SP) rotates smoothly. 2. Check the leading edge (DRUM entry side) of the FM waveform. If it looks like Waveform (B), the GUIDE ROLLER may be positioned too low. If it looks like Waveform (C), the GUIDE ROLLER may be positioned too high. To make the FM waveform flat as shown by Waveform (A), turn the height adjustment screw at the top of the GUIDE ROLLER (SP). · Turn the screw counter-clockwise if the position of the GUIDE ROLLER is lower than specified. · Turn the screw clockwise if the position of the GUIDE ROLLER is higher than specified. 3. Perform "3-2-4. Coarse Adjustment of Phase."

(C)

(D)

(E)

3-2-3. Height Adjustment of GUIDE ROLLER (TU)
1. Loosen the height adjustment screw at the top of the GUIDE ROLLER (TU) so that the GUIDE ROLLER (TU) rotates smoothly. 2. Check the trailing edge (DRUM exit side) of the FM waveform. If it looks like Waveform (D), the GUIDE ROLLER may be positioned too low. If it looks like Waveform (E), the GUIDE ROLLER may be positioned too high. To make the FM waveform flat as shown by Waveform (A), turn the height adjustment screw at the top of the GUIDE ROLLER (TU) · Turn the screw counter-clockwise if the position of the GUIDE ROLLER is too low. · Turn the screw clockwise if the position of the GUIDE ROLLER is too high. 3. Perform "3-2-4. Coarse Adjustment of Phase." Fig. 3-2-1

GUIDE ROLLER Height Adjustment Driver (859C259O80)

GUIDE ROLLER (SP)

GUIDE ROLLER (TU)

Fig. 3-2-2

- 30 -

3-2-4. Coarse Adjustment of Phase
1. Play back an alignment tape (NM6KE2 : 859C339O90). 2. Preset the tracking. 3. Check the FM waveform after performing "3-2-1