HS-U778_Service_Manual.pdf part of mitsubishi hs-u778 HS-U778_Service_Manual.part1.rar, most/all parts/service is the same as 747/776/746/448/447/446 text manual preview

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2002

MITSUBISHI
VIDEO CASSETTE RECORDER

MODEL

HS-U778
Only cassettes marked S-VHS or 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 : S-VHS/VHS 1/2" high-density video cassette tape : 120V AC ; 60 Hz : Approx. 25 W : EIA standard ; NTSC color : S-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) : 120min. with T-120 video cassette (SP mode) 360min. with T-120 video cassette (EP mode) : 4 rotary heads : 2 rotary heads : 1 stationary head : 1 full track head : 0.5 to 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 °F to 104 °F Relative Humidity : 30 % to 80 % RF Channel Output : Channel 3 or 4 switchable Weight : Approx. 8.4 lbs Dimensions : 16.7"(W) × 3.7"(H) × 11.8"(D) Timer Program Capacity : 1 month programmable / 8 programs : Deck Deck Video Input

Heads: Video Hi-Fi Audio 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 2002 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 Adjustment...............................................2 Y/C signal circuit Adjustment........................................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, FELT RING ......................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 ......................................................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 2 WASHER, THRUST WASHER, SLIP ADJUSTER, IDLER 2 UNIT ................................................9 CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY ............................11 FC HOLDER, MOTOR HOLDER, LOADING WORM, LOADING MOTOR ASSY, WORM WHEEL............................................12 PINCH ARM CAP, PINCH ASSY.................13 F/L PLATE, DOOR ARM..............................13 BRAKE CAM PLATE....................................14 GUIDE LAMP ...............................................15 MAIN CAM, GUIDE ARM (TU), BRAKE LEVER, LB PIN...............................16 L/D LOCK LEVER ........................................17 BRAKE BELT (SP), BELT HOLDER............17 BELT LEVER, BELT ADJUSTER ................18 TENSION ARM, TENSION LEVER, TENSION SPRING, TENS AXIS HOLDER, REEL DISK (SP side)...................................18 BRAKE BELT (TU).......................................19 BRAKE (TU), REEL DISK (TU side) ............19 SHIFT LEVER ..............................................20 CHARGE SPRING, SWING LEVER, CHARGE ASSY ...........................................21 LOADING ARM ASSY (SP), LOADING ARM ASSY (TU) .........................21 A/L LEVER ...................................................22 TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU).............................24 DRUM CLAMPER, DRUM ASSY.................25 DRUM MOTOR STATOR, BRUSH SPRING, SPACER, ROTOR CASE, END RING, BRUSH, UPPER DRUM ASSY....................26 CAPSTAN MOTOR......................................27 IMPEDANCE UNIT (SP), FLYWHEEL (SP)..........................................29 SSW HOLDER, SSW SLIDER.....................29

2-15 2-16

2-17 2-18 2-19 2-20 2-21 2-22 2-23 2-24 2-25

2-26 2-27 2-28 2-29 2-30 2-31 2-32 2-33 2-34

2-35 2-36 2-37 3.

Interchangeability Adjustment of the Mechanism.............................................30 3-1 Adjustment of BACK TENSION and TENSION POLE's Position ..........................30 3-2 Check and Adjustment of FM Envelope ................................................31

-2-

CONTENTS
3-2-1 GUIDE ROLLER Adjustment Check ............31 3-2-2 Height Adjustment of GUIDE ROLLER (SP) ..................................31 3-2-3 Height Adjustment of GUIDE ROLLER (TU) ..................................31 3-2-4 Coarse Adjustment of Phase .......................32 3-2-5 Flatness Check of FM Waveform.................32 3-2-6 Tape Running Condition at the GUIDE ROLLERs (Check1) ...............33 3-2-7 Tape Running Condition at the GUIDE ROLLERs (Check 2) ..............33 3-3 A/C HEAD Adjustment .................................34 3-3-1 Slant Adjustment of A/C HEAD ....................34 3-3-2 Azimuth and Height Adjustment of A/C HEAD ....................................................34 3-4 Phase Adjustment ........................................35 3-5 Tape wrinkle check ......................................35 4. Servicing for Tape Jam during the Loading Process .........................36 SERVICE CAN BE EXECUTED WITH THE EE PICTURE DISPLAYED........................37 DECK OPERATION CHECK .........................................37 FILE "PARTSLST" PARTS LIST ....................................................................1 1. CABINET ASSEMBLY........................................1 2. PACKING PARTS...............................................3 3. ELECTRICAL PARTS.........................................5 FILE "DECKASSY" DECK ASSEMBLY-1........................................................1 DECK ASSEMBLY-1 P/L ................................................2 DECK ASSEMBLY-2........................................................4 DECK ASSEMBLY-2 P/L ................................................5 FILE "SCHEMATC" BLOCK DIAGRAMS SCHEMATIC DIAGRAMS PRINTED CIRCUIT BOARDS 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 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 : Frequency of Color Subcarrier : Ground : Head Amplifier Switch : Hi-Fast Forward/Rewind 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 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 : Pretended Vertical 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 : 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 noncommercial 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 jumpered AC plug 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 two fastening screws (a) shown in Fig. 2. 2. Turn the set upside down as shown in Fig. 3. 3. Slide the Bottom Panel backward to remove it, taking care of the four catches (b).

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 and raise the Shield Cover to remove it. 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 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 Case using the jig shown below before attaching the DECK ASSY.

a Shield Cover

Fig. 4

b

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

DECK ASSY c D927

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-SIGNAL

PCB-JACK PCB-MAIN

LOCATION OF PRINTED 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. Unfasten the one catch (a) shown in Fig. 7 and rotate the PCB-OPE in the direction shown by arrow (b) and remove it in the direction shown by arrow (c).

PCB - OPE

a c b

Fig. 7

2. PCB-SIGNAL
1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Remove the one PCB Holder fastening screw (a) shown in Fig. 8 and remove the PCB Holder. 3. Raise the PCB-SIGNAL upward to remove it as shown in Fig. 8.

a

PCB Holder PCB-SIGNAL

Fig. 8

-7-

3. 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 three screws (a) shown in Fig. 9. 4. Remove the Holder for the AC Power Cord from the Base Chassis shown in Fig. 10. 5. Release the two fastening catches (b) shown in Fig. 9. Raise the PCB-MAIN to remove it. 6. Unfasten the fastening five screws (C) shown in Fig.11 and remove the Antenna Cover. 7. Raise the PCB-JACK upward to remove it as shown in Fig.11.

a

PCB - MAIN

b b

Fig. 9

Holder for the AC Power Cord

Base chassis
Fig. 10

Antenna Cover

c

PCB-JACK PCB-MAIN

Fig. 11

-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
Pattern Tweezers Solder Pattern
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.

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 13. IMPEDANCE UNIT (SP) 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 installed to the UPPER DRUM ASSY. The HEADS are very hard but brittle to shock (especially to shock in the vertical direction) and easily breakable. 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 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

!3 e w

r

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

b

FELT RING b

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

a

CLEANING ARM a

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

Fig. 2-1

2-2. STAY PLATE
SET POSITION : Normal

a

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

STAY PLATE

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

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 the Fig. 2-3-1 in the direction shown by the 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 the Fig. 2-3-1 in the direction shown by the arrow B and pull it out in the direction shown by the 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 the Fig. 2-3-2. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the Bosses of the BOTTOM ASSY shown in the Fig. 2-3-2. 3. Rotate the WORM WHEEL shown in the Fig. 2-3-1 so that the ARM (SP) stands vertically. 4. Insert the Boss b of the BOTTOM ASSY shown in the 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 the 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
SET 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 the Fig. 2-4 to remove the INSERT GUIDE (TU).

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

Fig. 2-4

2-5. INSERT GUIDE (SP)
SET 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 the Fig. 2-5 to remove the INSERT GUIDE (SP).

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

Fig. 2-5

-4-

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

c REC LEVER

REC SPRING

(Removal)
1. Remove the screw (a) fastening the REC HOLDER shown in the Fig. 2-6 to remove the REC HOLDER. 2. Release the REC SPRING shown in the 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 the Fig. 2-6 to remove the REC SPRING.

a REC HOLDER b

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

2-7. F/L ARM ASSY, F/L BEARING
SET POSITION : Normal Remove the following parts before replacing the F/L ARM ASSY, 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 2-5)

Fig. 2-6

MAIN PLATE ASSY

(Removal)
1. Release the catch (a) of the F/L BEARING shown in the Fig. 2-7 and pull out the F/L ARM ASSY in the direction shown by the 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 the Fig. 2-7 and rotate the F/L BEARING by 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 the Fig. 2-7. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the Boss of the ARM (SP) shown in the Fig. 2-7. 3. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the Bosses of the ARM (TU) shown in the Fig. 2-7. 4. Install the F/L BEARING shown in the Fig. 2-7. 5. Insert the Boss c of the F/L ARM ASSY shown in the 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
SET POSITION : Normal

LEAD CONNECTOR a a A/C HEAD UNIT

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

Head

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

Fig. 2-8

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

F/E HEAD

(Removal)
1. Lift the F/E HEAD shown in the Fig. 2-9-1 in the direction by the 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 the Fig. 2-9-1. Note : Never touch the Head shown in the 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)
SET POSITION : Normal

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

(Installation)
1. Install the SENSOR COVER (TU) shown in the Fig. 210.

a

SENSOR COVER (TU)

Fig. 2-10

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

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

(Installation)
1. Install the SENSOR COVER (SP) shown in the Fig. 211.

a SENSOR COVER (SP)
Fig. 2-11

-7-

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

(Installation)
1. Clean the 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 the Fig. 2-12. 3. Clean the 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 the Fig. 2-12.

Fig. 2-12

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

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

a

b

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

Fig. 2-13

-8-

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

REEL BELT a PULLEY BUSH

THRUST WASHER BELT PULLEY

(Removal)
1. Remove the REEL BELT shown in the Fig. 2-14-1. 2. Move the SHIFT SLIDER in the Fig. 2-14-1 in the direction shown of the arrow A to remove the SHIFT SLIDER from the SHIFT LEVER. 3. Release the two catches (a) of the PULLEY BUSH shown in the 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 IDLER 2 UNIT shown in the Fig. 2-14-1.

Pull in the direction

A of the Arrow (A) to
remove it from the SHIFT LEVER.

SHIFT SLIDER PULLEY GEAR ASSY SLIP GEAR SLIP SPRING SLIP 2 WASHER THRUST WASHER SLIP ADJUSTER GREASE (PG-641) IDLER 2 UNIT

GREASE (PG-641)

(Installation)
Note : Be careful so that GREASE and OIL does not adhere on the Felt Side of the PULLEY GEAR ASSY or the Grooved Side of the SLIP GEAR shown in the Fig. 2-14-4. 1. Apply OIL (FLOIL 948P) [859D154O20] to the SHAFT for the IDLER 2 UNIT shown in the Fig. 2-14-1. 2. Apply GREASE (PG-641) [859D055O30] to the parts on the IDLER 2 UNIT specified in the Fig. 2-14-1. 3. Apply GREASE (MULTEMP AC-DM) [859D055O90] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-14-1. 4. Apply GREASE (PG-641) [859D055O30] to the parts on the new SHIFT SLIDER specified in the Fig. 2-142. 5. Apply GREASE (PG-641) [859D055O30] to the parts on the new SLIP ADJUSTER specified in the Fig. 214-2. 6. Apply GREASE (PG-641) [859D055O30] to the parts on the new BELT PULLEY specified in the Fig. 2-14-3. 7. Install the IDLER 2 UNIT shown in the Fig. 2-14-1. 8. Install the SLIP ADJUSTER shown in the Fig. 2-14-3, matching the Lug of the SLIP ADJUSTER with the Center Notch of the 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
Fig. 2-14-2

.

-9-

9. Install the units from the SLIP 2 WASHER to REEL BELT shown in the 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 2 WASHER with its position set as shown in the Fig. 2-14-5. Note4 : Apply GREASE (PG-641) [859D055O30] to the part on the SLIP 2 WASHER specified in the Fig. 2-14-5. 10. Install the SHIFT SLIDER to the SHIFT LEVER shown in the Fig. 2-14-1.

SLIP ADJUSTER Center of the BELT PULLEY

IDLER UNIT

Match the Lug of the SLIP ADJUSTER with the Center Notch of the IDLER UNIT.
Fig. 2-14-3

Apply GREASE (PG-641) to the parts .

PULLEY GEAR ASSY Felt Side

SLIP GEAR Grooved Side

Fig. 2-14-4

[SLIP GEAR side] Straight end

SLIP SPRING

SLIP 2 WASHER

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

.

- 10 -

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

CAPSTAN BRAKE ASSY a

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

CAPSTAN MOTOR CAPSTAN BRAKE SPRING

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

Fig. 2-15

- 11 -

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

LOADING MOTOR ASSY b b a a LOADING WORM

(Removal)
1. Release the two catches (a) of the FC HOLDER shown in the Fig. 2-16-1 to remove the FC HOLDER. 2. Remove the two screws (b) fastening the MOTOR HOLDER shown in the Fig. 2-16-1 to remove the MOTOR HOLDER. 3. Remove the two screws (c) fastening the LOADING MOTOR ASSY shown in the 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 the Fig. 2-16-2. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the WORM WHEEL shown in the Fig. 2-16-2. 3. Install the WORM WHEEL. 4. Install the LOADING WORM, LOADING MOTOR ASSY to the MOTOR HOLDER. Note : Tighten the screw (c) shown in the 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
Fig. 2-16-2

.

- 12 -

2-17.PINCH ARM CAP, PINCH ASSY
SET POSITION : Normal

a PINCH ARM CAP Part B Part A PINCH ASSY

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

(Installation)
1. Insert Part A of the PINCH ASSY shown in the Fig. 217 in the most external groove of the MAIN CAM. 2. Install the PINCH ARM CAP matching the Part B of the PINCH ARM CAP with the Rib of the MAIN PLATE ASSY.

MAIN CAM Rib

Fig. 2-17

2-18.F/L PLATE, DOOR ARM
SET POSITION : Normal Remove the following parts before replacing the F/L PLATE, 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 ASSY (Item 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 the Fig. 2-18-1 to remove the F/L PLATE. 2. Remove the DOOR ARM.

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

(Installation)
1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the new F/L PLATE specified in the Fig. 2-18-1. 2. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the points on the new F/L PLATE specified in the Fig. 2-18-1.

GREASE (MULTEMP AC-DM) Fig. 2-18-1

- 13 -

3. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the MAIN PLATE ASSY specified in the Fig. 2-18-1. 4. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the DOOR ARM specified in the Fig. 218-1. 5. Install the DOOR ARM. 6. Match the Hole in the MAIN CAM with the Hole in the MAIN PLATE ASSY shown in the Fig. 2-18-2. 7. Install the F/L PLATE shown in the Fig. 2-18-1 from the front side (ARM (TU) side). 8. Insert the Boss of the F/L PLATE shown in the Fig. 218-2 into the Groove of the MAIN CAM.

Hole

MAIN CAM F/L PLATE

Boss
Fig. 2-18-2

2-19.BRAKE CAM PLATE
SET 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 ASSY (Item 2-17)

BRAKE CAM PLATE a MAIN CAM

b b

B A

(Removal)
1. Rotate the MAIN CAM in the Fig. 2-19-1 in the direction shown by the arrow A. And move the BRAKE CAM PLATE so that the three catches (a) of the MAIN PLATE ASSY can be released. 2. Remove the BRAKE CAM PLATE.

b a b a
Fig. 2-19-1

(Installation)
1. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the points on the BRAKE CAM PLATE specified in the Fig. 2-19-2. 2. Hook the BRAKE SPRING shown in the 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 the Fig. 2-19-1 into the slits of the BRAKE CAM PLATE. 4. Move the BRAKE SPRING in the Fig. 2-19-3 in the direction of the arrow C to release the Catch of the BRAKE (TU) and insert the BRAKE SPRING under the Catch. 5. Rotate the MAIN CAM shown in the Fig. 2-19-1 in the direction shown of the arrow B. And move the BRAKE CAM PLATE to hook it to the three catches (a) of the MAIN PLATE ASSY.

BRAKE CAM PLATE Back Back 70mm 40mm

Back

99mm 130mm

Back

Apply GREASE (MOLYKOTE G PASTE) to the points
Fig. 2-19-2

.

- 14 -

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

BRAKE (TU)
Fig. 2-19-3

2-20.GUIDE LAMP
SET 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 ASSY (Item 2-17) · BRAKE CAM PLATE (Item 2-19)

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

c MAIN PLATE ASSY

GUIDE LAMP a A b B Installing Direction

(Installation)
1. Clean the 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 the Fig. 2-20, matching 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 the arrow B (clockwise, when viewed from the bottom) to match the arm (a) of the GUIDE LAMP shown in the Fig. 2-20 with the longest slit (c) of the MAIN PLATE ASSY. Note : Clean the dirt on the GUIDE LAMP with a VIDEO HEAD cleaning cloth if necessary.

Removing Direction
Fig. 2-20

- 15 -

2-21.MAIN CAM, GUIDE ARM (TU), BRAKE LEVER, LB PIN
SET POSITION : Normal Remove the following parts before replacing the MAIN CAM, GUIDE ARM (TU), BRAKE 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 ASSY (Item 2-17) · F/L PLATE (Item 2-18)

MAIN CAM

BRAKE LEVER A GREASE (MULTEMP AC-DM)

a

GUIDE ARM (TU) LB PIN

(Removal)
1. Remove the MAIN CAM shown in the Fig. 2-21-1. 2. Remove the GUIDE ARM (TU) shown in the Fig. 2-211. 3. Move the BRAKE LEVER in the Fig. 2-21-1 in the direction shown by the arrow A and release the catch (a) to remove the BRAKE LEVER. 4. Remove the LB PIN shown in the Fig. 2-21-1.

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

MAIN PLATE ASSY

(Installation)
1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the new GUIDE ARM (TU) specified in the Fig. 2-21-1. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the MAIN PLATE ASSY specified in the Fig. 2-21-1. 3. Install the GUIDE ARM (TU), matching the Hole in the GUIDE ARM (TU) shown in the Fig. 2-21-2 with the Hole in the MAIN PLATE ASSY. Note : Install the GUIDE ARM (TU) so that the Part specified with the Oblique Lines of the GUIDE ARM (TU) will be under the SHAFT FLANGE of the PINCH ASSY. 4. Install the BRAKE LEVER shown in the Fig. 2-21-2 so that the Hole in the BRAKE LEVER overlaps the Hole in the MAIN PLATE ASSY. 5. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the new MAIN CAM specified in the Fig. 2-21-3. 6. Install the MAIN CAM so that the Hole in the MAIN CAM shown in the Fig. 2-21-2 overlaps with the Hole in the MAIN PLATE ASSY. Note : Install the MAIN CAM inserting the Pins of the CAPSTAN BRAKE ASSY, GUIDE ARM (TU), BRAKE LEVER into the Grooves on the back of the MAIN CAM for sure. Be careful that GREASE does not adhere on the Wall when applying GREASE to the most external circle on the back of the MAIN CAM (4 parts) shown in the Fig. 2-21-3.

MAIN PLATE ASSY

Hole

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

SHAFT FLANGE of the PINCH ASSY

Fig. 2-21-2

MAIN CAM Front Back

Wall

Apply GREASE (MULTEMP AC-DM) to the parts
Fig. 2-21-3

.

- 16 -

2-22.L/D LOCK LEVER
SET 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 ASSY (Item 2-17) · BRAKE CAM PLATE (Item 2-19)

L/D LOCK LEVER

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

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

2-23.BRAKE BELT (SP), BELT HOLDER
SET POSITION : Normal Remove the following parts before replacing the BRAKE BELT (SP), 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 the 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 the Fig. 2-23. 3. Release the two catches (b) of the BELT HOLDER shown in the Fig. 2-23 and separate the BELT HOLDER from the BRAKE BELT (SP). 4. Release the catch (c) of the BELT HOLDER shown in the 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 should not adhere on the Felt Side of the BRAKE BELT (SP). 1. Install the BRAKE BELT (SP) shown in the Fig. 2-23 to the catch (c) of the BELT HOLDER. 2. Install the BELT HOLDER shown in the Fig. 2-23. 3. Install the BRAKE BELT (SP) shown in the Fig. 2-23 to the catch (a) of the BELT LEVER. 4. Hook the BRAKE BELT (SP) shown in the Fig. 2-23 to the REEL DISK (SP side).

REEL DISK (SP side)
Fig. 2-23

- 17 -

2-24. BELT LEVER, BELT ADJUSTER
SET POSITION : Normal Remove the following parts before replacing the BELT LEVER, 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 ASSY (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 the Fig. 2-24 to remove the BELT LEVER. 2. Remove the BELT ADJUSTER shown in the Fig. 2-24.

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

2-25 TENSION ARM, TENSION LEVER, TENSION SPRING, TENS AXIS HOLDER, REEL DISK (SP side)
SET POSITION : Normal Remove the following parts before performing this Item. 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 ASSY (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 the Fig. 225. 2. Release the catch (a) of the TENS AXIS HOLDER shown in the Fig. 2-25 to remove the TENSION ARM. 3. Remove the TENSION LEVER shown in the Fig. 2-25. 4. Release the catch (b) of the TENS AXIS HOLDER shown in the Fig. 2-25. Move the TENS AXIS HOLDER in the direction shown by the 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 OIL (FLOIL 948P) [859D154O20] to the parts on the MAIN PLATE ASSY specified in the 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 will be 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)
SET 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 the Fig. 2-26 to remove it from the REEL DISK (TU side). 2. Release the two catches (a) of the BRAKE (TU) shown in the Fig. 2-26 to remove the BRAKE BELT (TU).

(Installation)
1. Install the BRAKE BELT (TU) shown in the Fig. 2-26 to the BRAKE (TU). 2. Hook the BRAKE BELT (TU) shown in the 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)
SET POSITION : Normal Remove the following parts before replacing the BRAKE (TU), 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 ASSY (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 the Fig. 2-27 in the direction shown by the 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 should not adhere on the Felt Side of the BRAKE BELT (SP). 1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the MAIN PLATE ASSY specified in the 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
Back
SET 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 ASSY (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · BRAKE (TU) (Item 2-27) · REEL DISK (TU side) (Item 2-27)

SHIFT LEVER

a

B Back

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

A SHIFT SLIDER

Back

(Installation)
1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the new SHIFT LEVER specified in the Fig. 2-28. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-28. 3. Install the SHIFT LEVER so that its Part (a) shown in the Fig. 2-28 will be 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 .

Fig. 2-28

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2-29.CHARGE SPRING, SWING LEVER, CHARGE ASSY
SET POSITION : Normal Remove the following parts before replacing the CHARGE SPRING, SWING LEVER, 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 ASSY (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 the Fig. 2-29 from the SWING LEVER. 2. Remove the SWING LEVER shown in the Fig. 2-29. 3. Release the Part a of the CHARGE ASSY shown in the Fig. 2-29 from the 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 parts on the MAIN PLATE ASSY specified in the Fig. 2-29. 2. Install the CHARGE ASSY. 3. Install the SWING LEVER inserting the Part c of the SWING LEVER in the Fig. 2-29 into the groove in the MAIN PLATE ASSY. 4. Install the CHARGE SPRING to the SWING LEVER.

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

b SPACER PLATE LOADING ARM ASSY (TU)

(Removal)
1. Release the catch (a) of the LOADING ARM ASSY (SP) shown in the 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 the Fig. 2-30-1 to remove the SPACER PLATE. 3. Remove the LOADING ARM ASSY (TU) shown in the 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 parts on the MAIN PLATE ASSY specified in the Fig. 2-30-1. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the LOADING ARM ASSY (TU) specified in the Fig. 2-30-2. 3. Install the LOADING ARM ASSY (SP) and LOADING ARM ASSY (TU) so that the Marks on the both UNITs face each other, as shown in the Fig. 2-30-3. Note : Be sure to replace the removed LOADING ARM ASSY (SP) with a new one.

LOADING ARM ASSY (TU)

Apply GREASE (MULTEMP AC-DM) to the parts
Fig. 2-30-2

.

LOADING ARM ASSY (TU)

Mark

LOADING ARM ASSY (SP)

Fig. 2-30-3

2-31.A/L LEVER
SET 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 ASSY (Item 2-17) · BRAKE CAM PLATE (Item 2-19) · LOADING ARM ASSY (SP) (Item 2-30) · LOADING ARM ASSY (TU) (Item 2-30)

CUT WASHER

A/L LEVER WASHER

GREASE (MOLYKOTE G PASTE)

(Removal)
1. Remove the CUT WASHER and WASHER shown in the 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), according to the following procedure, after installing the A/L LEVER. 1. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-31-1. 2. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the parts on the A/L LEVER specified in the Fig. 2-31-2. 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 the Fig. 2-31-3. Note : The Part specified with Oblique Lines on the A/L LEVER should be 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 on the A/L LEVER will face each other, as shown in the Fig. 2-31-4. 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) will face each other, as shown in the 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 Fig. 2-31-2

.

A/L LEVER

Boss

FLANGE of LOADING ARM ASSY (SP)

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

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2-32.TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU)
SET POSITION : Normal Remove the following parts before replacing the TAPE GUIDE ASSY (SP), (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 ASSY (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)

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

Fig. 2-32-1

(Removal)
1. Loosen the TAPE GUIDE ASSY (SP) shown in the Fig. 2-32-1 (turn it fully in the Unloading direction) to remove it. 2. Loosen the TAPE GUIDE ASSY (TU) shown in the Fig. 2-32-1 (turn it fully in the Unloading direction) to remove it.

GUIDE CATCHER (SP) GUIDE CATCHER (TU)

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

Front of MAIN PLATE ASSY

Back of MAIN PLATE ASSY .

Apply GREASE (MULTEMP AC-DM) to the parts
Fig. 2-32-2

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

LEAD CONNECTOR a b

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

DRUM ASSY with DRUM CLAMPER

(Installation)
1. Install the DRUM CLAMPER in the Fig. 2-33-2 to the DRUM ASSY by rotating it in the direction shown of the arrow B. 2. Hook the Catch of the DRUM CLAMPER shown in the Fig. 2-33-3 to the Reference Pin. 3. Fasten the screw (b) while pushing the Part A in the direction shown by the arrow C (clockwise when viewed from the top) as shown in the Fig. 2-33-3. Note : Confirm at this time that the Catch of the DRUM CLAMPER touches the side of the Reference Pin. 4. Fasten the screw (a) shown in the Fig. 2-33-3. Note : Confirm at this time 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 the Fig. 2-33-1. 6. Connect the LEAD CONNECTOR of the DRUM ASSY shown in the Fig. 2-33-1. 7. Perform the Item "PLAYBACK Switching Point" of the "Circuit Adjustment" in this service manual. 8. Perform the Item "Interchangeability Adjustment of the Mechanism". 9. Clean the DRUM ASSY shown in the 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

- 25 -

b a Part A

C

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

2-34.DRUM MOTOR STATOR, BRUSH SPRING, SPACER, ROTOR CASE, END RING, BRUSH, UPPER DRUM ASSY
SET 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 the Fig. 2-34-1. 2. Remove the two screws (a) fastening the DRUM MOTOR STATOR shown in the Fig. 2-34-1 to remove the DRUM MOTOR STATOR. 3. Remove the two screws (b) fastening the ROTOR CASE shown in the Fig. 2-34-1 to remove the ROTOR CASE. Note : Mark on the END RING and UPPER DRUM ASSY shown in the Fig. 2-34-1 using a pen, etc. for convenience in installing them. 4. Loosen the hexagon screw (c) fastening the END RING shown in the Fig. 2-34-1 to remove the END RING. 5. Remove the BRUSH SPRING shown in the Fig. 2-341. 6. Remove the BRUSH shown in the Fig. 2-34-1. 7. Remove the UPPER DRUM ASSY shown in the Fig. 2-34-1. 8. Remove the SPACER shown in the Fig. 2-34-1.

BRUSH

c

UPPER DRUM ASSY Mark using a pen, etc. for convenience in attachment.

SPACER LOWER DRUM ASSY

Fig. 2-34-1

- 26 -

(Installation)
1. Install the SPACER shown in the Fig. 2-34-1. Note : Be sure to use the new SPACER packed with the new UPPER DRUM ASSY. 2. Install the UPPER DRUM ASSY shown in the Fig. 234-1. 3. Install the END RING so that the reference hole (A) of the END RING shown in the Fig. 2-34-2 will be placed in parallel with the Rear Line of the MAIN PLATE ASSY. (The reference hole (A) should 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 the Fig. 2-34-1. 5. Install the ROTOR CASE shown in the Fig. 2-34-3, matching its Holes with the three reference holes (B) of the UPPER DRUM ASSY. 6. Install the BRUSH shown in the Fig. 2-34-1. 7. Install the BRUSH SPRING shown in the Fig. 2-34-1. 8. Install the DRUM MOTOR STATOR shown in the Fig. 2-34-1. 9. Connect the LEAD CONNECTOR of the DRUM ASSY shown in the Fig. 2-34-1. 10. Perform the Item "PLAYBACK Switching Point" adjustment. 11. Perform the Item "Interchangeability Adjustment of the Mechanism". 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
SET 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 the Fig. 2-35-1 in the direction shown by the arrow A to release the Hooks of the BOTTOM ASSY from the Locks of the STAY PLATE. 2. Rotate the WORM WHEEL in the Fig. 2-35-2 in the direction shown by the 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 the Fig. 2-35-2 to remove the CAPSTAN MOTOR.

A

Hook of BOTTOM ASSY
Fig. 2-35-1

- 27 -

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

a

WORM WHEEL A

GUIDE ARM (TU) Arrow B

CAPSTAN MOTOR

Fig. 2-35-2

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

- 28 -

2-36.IMPEDANCE UNIT (SP), FLYWHEEL (SP)
SET POSITION : Normal

FLYWHEEL (SP) a IMPEDANCE UNIT (SP) a b

(Removal)
1. Unfasten the two catches (a) on the IMPEDANCE UNIT (SP) shown in Fig. 2-36, and remove the FLYWHEEL (SP). 2. Remove the screw (b) on the IMPEDANCE UNIT (SP) shown in Fig. 2-36, and remove the IMPEDANCE UNIT (SP).

(Installation)
1. Install the IMPEDANCE UNIT (SP) shown in Fig. 2-36. 2. Install the FLYWHEEL (SP) shown in Fig. 2-36.

Fig. 2-36

2-37.SSW HOLDER, SSW SLIDER
SET POSITION : Upside down To access the SSW UNIT, remove the following parts : · STAY PLATE (Para. 2-2) · BOTTOM ASSY (Para. 2-3)

SSW SLIDER

SSW HOLDER a

a

(Removal)
1. Remove the SSW SLIDER shown in the Fig. 2-37 . 2. Unfasten the two catches (a) shown in Fig. 2-37, and remove the SSW HOLDER.

(Installation)
1. Install the SSW HOLDER shown in Fig. 2-37. 2. Install the SSW SLIDER shown in Fig. 2-37.

Fig. 2-37

- 29 -

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 : The adjustments are performed in the PLAYBACK mode, using the staircase signal of an alignment tape,unless otherwise specified.Connect an oscilloscope to TP2A 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 the Fig. 3-1-1, is 0.6 ± 0.5mm. 3. If "A" is not 0.6 ± 0.5mm, move the Hole in the BELT ADJUSTER in the Fig. 3-1-2 within the range shown by the arrow A to set "A" at 0.6 ± 0.5mm. 4. Set the BACK TENSION measuring jig (Code: 859C345O80) and play-back the tape. 5. Confirm that "A" shown in the Fig. 3-1-1 is 0.0 ± 0.5mm. 6. If "A" is not 0.0 ± 0.5mm at step 5, repeat the adjustment from step 1. 7. Confirm that the indicated value of the BACK TENSION measuring jig is within 55 ± 6g/cm. Note 1 : Check the indicated value of the BACK TENSION measuring jig when 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 1mm or less. If the vibration range exceeds 1mm, replace the REEL DISK.

A

BELT ADJUSTER
Fig. 3-1-1

A

Hole BELT ADJUSTER
Fig. 3-1-2

- 30 -

3-2. Check and Adjustment of the FM Envelope
3-2-1. GUIDE ROLLER Adjustment check
1. 2. 3. 4. Play back an alignment tape (NM6KE2 : 859C339O90). Preset the tracking. Confirm that the FM Waveform is flat such as in (A). Perform the Item 3-2-2. "Height Adjustment of GUIDE ROLLER (SP) " if the leading edge (the DRUM entry side) of the FM Waveform is not flat (Waveform (B) or (C)). Perform the Item 3-2-3. "Height Adjustment of GUIDE ROLLER (TU)" if the trailing edge (the DRUM exit side) is not flat (Waveform (D) or (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) will rotate smoothly. 2. Observe the leading edge (DRUM entry side) of the FM Waveform. If it looks like (B), the GUIDE ROLLER may be set too low. If it looks like (C), the GUIDE ROLLER may be set too high. To adjust it, turn the height adjustment screw at the top of the GUIDE ROLLER (SP) so that the FM Wave