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SERVICE MANUAL
VIDEO CASSETTE RECORDER

HR-S8850EK/EU

HR-S8850EK/EU
GENERAL Power requirement Power consumption Power on Power off Temperature Operating Storage Operating position Dimensions (WxHxD) Weight Format Maximum recording time (SP) (LP) (EP) VIDEO/AUDIO Signal system Recording system Signal-to-noise ratio Horizontal resolution (SP/LP) (EP) Frequency range Input/Output : : : : : :

INSERT

A.DUB

SPECIFICATIONS (The specifications shown pertain specifically to the model HR-S8850EU)
: AC 220 V 240 V ` , 50 Hz/60 Hz : 22 W : 3.8 W 5°C to 40°C 20°C to 60°C Horizontal only 400 mm x 94 mm x 278 mm 3.6 kg S-VHS/VHS PAL standard TUNER/TIMER TV channel storage capacity : 99 positions (+AUX position) Tuning system : Frequency synthesized tuner Channel coverage : VHF 47 MHz 89 MHz/ 104 MHz 300 MHz/ 302 MHz 470 MHz UHF 470 MHz 862 MHz Aerial output : UHF channels 22 69 (Adjustable) Memory backup time : Approx. 10 min. ACCESSORIES Provided accessories : RF cable, Satellite Controller RM-SD1, Infrared remote control unit, "R6" battery x 2

: 240 min. with E-240 video cassette : 480 min. with E-240 video cassette : 720 min. with E-240 video cassette : PAL-type colour signal and CCIR monochrome signal, 625 lines 50 fields : DA4 (Double Azimuth) head helical scan system : 45 dB : 250 lines (VHS) 400 lines (S-VHS) : 220 lines (VHS) 350 lines (S-VHS) : 70 Hz to 10,000 Hz (Normal audio) 20 Hz to 20,000 Hz (Hi-Fi audio) : 21-pin SCART connectors: IN/OUT x 1, IN/DECODER x 1 RCA connectors: VIDEO IN x 1, AUDIO IN x 1, AUDIO OUT x 1 S-Video connectors: IN x 1, OUT x 1

Specifications shown are for SP mode unless otherwise specified. E.& O.E. Design and specifications subject to change without notice.

No. 82863

VICTOR COMPANY OF JAPAN, LIMITED VIDEO DIVISION

S40894

Printed in Japan

This service manual is printed on 100% recycled paper. COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

No. 82863 May 2001

TABLE OF CONTENTS
Section Title Page Section Title Page
3-1 3-1 3-1 3-1 3-1 3-1 3-2 3-2 3-2 3-2 3-2 3-2 3-3 3-3 3-4 3-4 3-4 3-4 3-4 Important Safety Precautions INSTRUCTIONS 1. DISASSEMBLY 1.1 Disassembly flow chart ......................................................... 1.2 How to read the disassembly and assembly ........................ 1.3 Disassembly/assembly method ............................................ 1.4 Service position .................................................................... 1.4.1 How to set the "Service position" ..................................... 1.5 Mechanism service mode ..................................................... 1.5.1 How to set the "Mechanism service mode" ..................... 1.6 Jig RCU mode ...................................................................... 1.6.1 Setting the Jig RCU mode ............................................... 1.6.2 Setting the User RCU mode ............................................ 1.7 Servicing items related to video navigation .......................... 1.8 Emergency display function .................................................. 1.8.1 Displaying the EMG information ...................................... 1.8.2 Clearing the EMG history ................................................ 1.8.3 EMG content description ................................................. 1.8.4 EMG detail information <1> ............................................. 1.8.5 EMG detail information <2> ............................................. 1-1 1-1 1-1 1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-5 1-5 1-5 1-6 1-7 1-8 3. ELECTRICAL ADJUSTMENT 3.1 Precaution ............................................................................ 3.1.1 Required test equipments ............................................... 3.1.2 Required adjustment tools ............................................... 3.1.3 Color (colour) bar signal,Color (colour) bar pattern ......... 3.1.4 Switch settings and standard precautions ....................... 3.1.5 EVR Adjustment .............................................................. 3.2 Servo circuit .......................................................................... 3.2.1 Switching point ................................................................ 3.2.2 Slow tracking preset ........................................................ 3.3 Video circuit .......................................................................... 3.3.1 D/A level .......................................................................... 3.3.2 EE Y/PB Y (S-VHS/VHS) level ......................................... 3.3.3 REC color (colour) level ................................................... 3.3.4 Video EQ (Frequency response) ..................................... 3.3.5 Auto picture initial setting ................................................. 3.4 Audio circuit .......................................................................... 3.4.1 Audio REC FM ................................................................. 3.5 Syscon circuit ....................................................................... 3.5.1 Timer clock ......................................................................

2. MECHANISM ADJUSTMENT 2.1 Before starting repair and adjustment ................................... 2-1 2.1.1 Precautions ..................................................................... 2-1 2.1.2 Checking for proper mechanical operations .................... 2-1 2.1.3 Manually removing the cassette tape .............................. 2-1 2.1.4 Jigs and tools required for adjustment ............................. 2-2 2.1.5 Maintenance and inspection ............................................ 2-3 2.2 Replacement of major parts ................................................. 2-6 2.2.1 Before starting disassembling (Phase matching between mechanical parts) ............................................................ 2-6 2.2.2 How to set the "Mechanism assembling mode" ............... 2-6 2.2.3 Cassette holder assembly ............................................... 2-6 2.2.4 Pinch roller arm assembly ............................................... 2-8 2.2.5 Guide arm assembly and press lever assembly .............. 2-8 2.2.6 A/C head ......................................................................... 2-8 2.2.7 Loading motor ................................................................. 2-8 2.2.8 Capstan motor ................................................................. 2-9 2.2.9 Pole base assembly (supply or take-up side) .................. 2-9 2.2.10 Rotary encoder ........................................................... 2-10 2.2.11 Clutch unit ................................................................... 2-10 2.2.12 Change lever assembly, direct gear, clutch gear and coupling gear .............................................................. 2-10 2.2.13 Link lever ..................................................................... 2-11 2.2.14 Cassette gear, control cam and worm gear ................ 2-11 2.2.15 Control plate ............................................................... 2-11 2.2.16 Loading arm gear (supply or take-up side) and loading arm gear shaft ................................................ 2-12 2.2.17 Take-up lever, take-up head and control plate guide .. 2-13 2.2.18 Capstan brake assembly ............................................ 2-13 2.2.19 Sub brake assembly (take-up side) ............................ 2-13 2.2.20 Main brake assembly (take-up side), reel disk (take-up side) and main brake assembly (supply side) .................................. 2-13 2.2.21 Tension brake assembly, reel disk (supply side) and tension arm assembly ................................................. 2-14 2.2.22 Idler lever, idler arm assembly .................................... 2-14 2.2.23 Stator assembly .......................................................... 2-14 2.2.24 Rotor assembly ........................................................... 2-14 2.2.25 Upper drum assembly ................................................. 2-15 2.3 Compatibility adjustment .................................................... 2-16 2.3.1 FM waveform linearity ................................................... 2-16 2.3.2 Height and tilt of the A/C head ...................................... 2-17 2.3.3 A/C head phase (X-value) ............................................. 2-17 2.3.4 Standard tracking preset ............................................... 2-18 2.3.5 Tension pole position ..................................................... 2-18

4. CHARTS AND DIAGRAMS NOTES OF SCHEMATIC DIAGRAM .......................................... 4-1 CIRCUIT BOARD NOTES ........................................................... 4-2 4.1 BOARD INTERCONNECTIONS .......................................... 4-3 4.2 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM .................. 4-5 4.3 MAIN (ON SCREEN) SCHEMATIC DIAGRAM .................... 4-7 4.4 MAIN (SYSCON) SCHEMATIC DIAGRAM .......................... 4-9 4.5 MAIN (SW.REG) SCHEMATIC DIAGRAM ......................... 4-11 4.6 MAIN (TUNER) SCHEMATIC DIAGRAM ........................... 4-13 4.7 MAIN (SW/DISPLAY), MINI FRONT, S-JACK AND ADV.JOG SCHEMATIC DIAGRAMS .................................. 4-15 4.8 MAIN (MAIN TERMINAL) SCHEMATIC DIAGRAM ............ 4-17 4.9 3D/TBC(2M) SCHEMATIC DIAGRAM ................................ 4-19 4.10 TERMINAL (S-SUB) SCHEMATIC DIAGRAM ................. 4-21 4.11 TERMINAL (I/O) SCHEMATIC DIAGRAM ....................... 4-23 4.12 DEMODULATOR SCHEMATIC DIAGRAM ...................... 4-25 4.13 3D DIGITAL/2M AND DEMODULATOR CIRCUIT BOARD . 4-27 4.14 TERMINAL CIRCUIT BOARD ......................................... 4-28 4.15 MAIN CIRCUIT BOARD ................................................... 4-29 4.16 REMOTE CONTROLLER SCHEMATIC DIAGRAM ......... 4-32 4.17 FDP GRID ASSIGNMENT AND ANODE CONNECTION . 4-33 4.18 WAVEFORMS .................................................................. 4-34 4.19 VOLTAGE CHARTS ......................................................... 4-36 4.20 CPU PIN FUNCTION ....................................................... 4-37 4.21 SYSTEM CONTROL BLOCK DIAGRAM ......................... 4-39 4.22 VIDEO BLOCK DIAGRAM ............................................... 4-41 4.23 AUDIO BLOCK DIAGRAM ............................................... 4-45 5. PARTS LIST 5.1 PACKING AND ACCESSORY ASSEMBLY ............... 5-1 5.2 FINAL ASSEMBLY .................................................... 5-2 5.3 MECHANISM ASSEMBLY ........................................ 5-4 5.4 ELECTRICAL PARTS LIST .................................................. 5-6 MAIN BOARD ASSEMBLY <03> ............................................... 5-6 3D DIGITAL/2M BOARD ASSEMBLY <05> ............................. 5-13 TERMINAL BOARD ASSEMBLY <06> ................................... 5-15 A/C HEAD BOARD ASSEMBLY <12> ..................................... 5-17 DEMOD BOARD ASSEMBLY <14> ........................................ 5-17 MINI FRONT BOARD ASSEMBLY <28> ................................. 5-17 S JACK BOARD ASSEMBLY <36> ......................................... 5-17 ADV.JOG BOARD ASSEMBLY <38> ....................................... 5-17 LOADING MOTOR BOARD ASSEMBLY <55> ....................... 5-17

The following table lists the differing points between Models ( HR-S8850EK and HR-S8850EU) in this series.
HR-S8850EK VIDEO SYSTEM BROADCASTING STANDARD STEREO DECODER RF OUT SYSTEM [INITIAL] VCR PLUS+ VPS(AUTO) INITIAL (TIMER) LANGUAGE [INITIAL] (ON SCREEN DISPLAY) WINDOW COLOR PAL/NTSC ON PAL TV I NICAM I VIDEOPLUS+ DELUXE NOT USED OFF ENG CLEAR HR-S8850EU PAL/MESECAM(MANUAL)/NTSC ON PAL TV B/G,D/K NICAM/A2 G/K SHOWVIEW DELUXE USED GER,AUS,SWISS:ON, OTHER:OFF 13 LANG. [E] GREEN

Important Safety Precautions
Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and certain parts of the product. When performing service, be sure to read and comply with these and other cautionary notices appearing in the operation and service manuals. 2. Parts identified by the ! symbol and shaded ( ) parts are critical for safety. Replace only with specified part numbers. Note: Parts in this category also include those specified to comply with X-ray emission standards for products using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission. 3. Fuse replacement caution notice. Caution for continued protection against fire hazard. Replace only with same type and rated fuse(s) as specified. 4. Use specified internal wiring. Note especially: 1) Wires covered with PVC tubing 2) Double insulated wires 3) High voltage leads 5. Use specified insulating materials for hazardous live parts. Note especially: 1) Insulation Tape 3) Spacers 5) Barrier 2) PVC tubing 4) Insulation sheets for transistors 6. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering.

· Precautions during Servicing

12. Crimp type wire connector In such cases as when replacing the power transformer in sets where the connections between the power cord and power transformer primary lead wires are performed using crimp type connectors, if replacing the connectors is unavoidable, in order to prevent safety hazards, perform carefully and precisely according to the following steps. 1) Connector part number : E03830-001 2) Required tool : Connector crimping tool of the proper type which will not damage insulated parts. 3) Replacement procedure (1) Remove the old connector by cutting the wires at a point close to the connector. Important : Do not reuse a connector (discard it).

cut close to connector
Fig.3 (2) Strip about 15 mm of the insulation from the ends of the wires. If the wires are stranded, twist the strands to avoid frayed conductors.
15 mm

Fig.4 (3) Align the lengths of the wires to be connected. Insert the wires fully into the connector. Fig.1 7. Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.) 8. Check that replaced wires do not contact sharp edged or pointed parts. 9. When a power cord has been replaced, check that 10-15 kg of force in any direction will not loosen it.

Metal sleeve

Connector
Fig.5 (4) As shown in Fig.6, use the crimping tool to crimp the metal sleeve at the center position. Be sure to crimp fully to the complete closure of the tool.

Power cord
1.2 5 2.0 5.5

Crimping tool

Fig.2 10. Also check areas surrounding repaired locations. 11. Products using cathode ray tubes (CRTs) In regard to such products, the cathode ray tubes themselves, the high voltage circuits, and related circuits are specified for compliance with recognized codes pertaining to X-ray emission. Consequently, when servicing these products, replace the cathode ray tubes and other parts with only the specified parts. Under no circumstances attempt to modify these circuits. Unauthorized modification can increase the high voltage value and cause X-ray emission from the cathode ray tube.

Fig.6 (5) Check the four points noted in Fig.7.
Not easily pulled free Crimped at approx. center of metal sleeve

Conductors extended Wire insulation recessed more than 4 mm

Fig.7

I

S40888-01

· Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions, Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

1. Insulation resistance test Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table 1 below. 2. Dielectric strength test Confirm specified dielectric strength or greater between power cord plug prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table 1 below. 3. Clearance distance When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic parts. See table 1 below.

Fig. 8 4. Leakage current test Confirm specified or lower leakage current between earth ground/power cord plug prongs and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). Measuring Method : (Power ON) Insert load Z between earth ground/power cord plug prongs and externally exposed accessible parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and following table 2.

a

b c

Externally exposed accessible part

Z V

A

Fig. 9 5. Grounding (Class 1 model only) Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in, Video out, Audio in, Audio out or Fixing screw etc.). Measuring Method: Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.

Fig. 10

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

II

S40888-01

SECTION 1 DISASSEMBLY
1.1 Disassembly flow chart This flowchart lists the disassembling steps for the cabinet parts and P.C. boards in order to gain access to item(s) to be serviced. When reassembling, perform the step(s) in reverse order. Bend, route and dress the flat cables as they were originally laid. 1.3 Disassembly/assembly method
Step/ Part Name Loc No. [1] Top cover, Bracket [2] Front panel assembly Fig. Point Note No. D1 4(S1a), (S1b) ----------------2(S1c) D2 CN7005(WR2a) CN916(WR2b) 4(L2a), 3(L2b) ----------------2(S2a) ----------------2(S2b) D3 CON1(WR3a), CN1(WR3b), (S3a), (S3b), (S3c) ----------------4(L3a) ----------------(P3), (L3b) D4 CN2001(WR4a), (S4a), (S4b), (S4c), (S4d) D5 (L5a), CN7001(WR5a) ----------------7(L5b),(S5a),3(S5b) D6 2(L6a), 9(L6b)

[1]

Top cover, Bracket Front panel assembly, ADV. Jog board assembly, S Jack board assembly Drum assembly
[4] [3]

ADV. Jog board assembly S Jack board assembly Drum assembly

[2] [3] [4] [5] [6]

(Inertia plate) (Roller arm assy) Mechanism assembly

Mechanism assembly Mini front board assembly, Main board assembly Bottom cover
[5] Mini front board assembly Main board assemby Bottom cover

[6]

1.2 How to read the disassembly and assembly
Step/ Part Name Loc No. [1] Top cover, Bracket Fig. Point Note No. D1 4(S1a),(S1b),3(L1a), 2(SD1a),(P1a),(W1a), CN1(WR1a), 2(S1c)

· When reattaching the Front panel assembly, make sure that the door opener "a" of the Cassette holder assembly is lowered in position prior to the reinstallation. · When reattaching the Front panel assembly, pay careful attention to the switch lever not to make it touch the switch knob "b" of the Main board assembly from the side. · Be careful not to damage the connector and wire etc. during connection and disconnection. When connecting the wire to the connector, be careful with the wire direction. · When it is required to remove the screws (S4a to S4b) retaining the Mechanism assembly, please refer to the "Procedures for Lowering the Cassette holder assembly"(See on page 1-2). · When reattaching the Mechanism assembly to the Main board assembly, take care not to damage the sensors and switch on the Main board assembly. · When removing the Mechanism assembly only, unhook the two spacers connecting it with the Main board assembly with pliers from the back side of the Main board assembly first, and then remove the Mechanism assembly. · The wire (WR4a) has excess length that may be loose, as it is quite long. After inserting the wire and connectors, the loose portion of the wire should be taken up and accommodated between the A/C head base and the main deck. When removing the PC Support from the bottom chassis, take care not to damage the locking portion of the PC Support. When removing the bottom cover, push down the two tabs (L6a) to slide the bottom cover.

(1)

(2)

(3)

(4)

(5)

(1) Order of steps in Procedure When reassembling, perform the step(s) in the reverse order. These numbers are also used as the identification (location) No. of parts Figures. (2) Part name to be removed or installed. (3) Fig. No. showing procedure or part location. (4) Identification of part to be removed, unhooked, unlocked, released, unplugged, unclamped or unsoldered. P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder, CN**(WR**)= Remove the wire (WR**) from the connector (CN**). Note: · The bracketed ( ) WR of the connector symbol are assigned nos. in priority order and do not correspond to those on the spare parts list. (5) Adjustment information for installation

1-1

Procedures for Lowering the Cassette holder assembly As the mechanism of this unit is integrated with the Housing assembly, the holder must be lowered and the two screws unscrewed when removing the Mechanism assembly.

Front panel back side
CN7108

(S2b)

WR2b S Jack board assembly

(L2a)
(A) (B)

CN916

Fig. 2

CN7005
Fig. 1

Fig. 3

[2] Front panel assembly

(L2b) WR2b
CN7003

b (L2a)
WR2a

a WR2a

Turn the loading motor pulley in the direction as indicated by Fig.2. As both (A) and (B) levers are lodged twice, push the levers in the direction as indicated by Fig.3 to release them. When pushing the levers, do it in the order of (A), (B), (B), (A). When the holder has been lowered, turn the pulley until the cassette holder is securely in place without allowing any up/down movement.

(S2a) ADV. Jog board assembly

Fig. D2
Note: When installing the Drum assembly, secure the screws (S3a to S3c) in the order of a, b, c.
Not used

Procedures for Lowering the Cassette holder assembly

Drum shield

(S1a)

(S1b)
(S3d)

[1] Top cover

Inertia plate
(S3a) (S3c)

(L3a)

WR3a
CON1

(S1c) (S1a) (S1c)

(S1a)

(P3)
(S3b)

WR3b Cleaner assy

(L3b) Roller arm assy

[1]
Bracket

[3] Drum assembly

(L3c)

Not used

CN1

Fig. D1 1-2

Fig. D3

WR4a

A/C head base

Note: When installing the Mechanism assembly, secure the screws (S4a to S4b) in the order of a, b.

(S4c) (S4b)

WR4a (S4a) (S4d)

[4] Mechanism assembly Q3003 End sensor

(L6a)

(L6b)

CN2001

(L4) (L4) Spacer Spacer S3002 Q3002 S cassette switch Start sensor D3001 LED

(L6b)

(L6b)

[6] Bottom cover

Fig. D6

Fig. D4

(S5b) (S5a)

(L5b)

[5] Main board assembly

(L5a) PC support WR5a [5] Mini front board assembly

Fig. D5 1-3

1.4 Service position This unit has been designed so that the Mechanism and Main board assemblies can be removed together from the chassis assembly. Before diagnosing or servicing the circuit boards, take out the major parts from the chassis assembly. 1.4.1 How to set the "Service position" (1) Refer to the disassembly procedure and perform the disassembly of the major parts before removing the Drum assembly. (2) Lower the cassette holder to prepare for the removal of the Mechanism assembly screws. (Refer to the "Procedures for lowering the Cassette holder assembly" of 1.3 Disassembly/assembly method.) (3) Remove the combined Mechanism and Main board assemblies. (4) Connect the wires and connectors of the major parts that have been removed in step (1). (Refer to Fig.1-4-1a.) (5) Place the combined Mechanism and Main board assemblies upside down. (6) Insert the power cord plug into the power outlet and then proceed with the diagnostics and servicing of the board assembly. Notes: · Before inserting the power cord plug into the power outlet, make sure that none of the electrical parts are able to short-circuit between the workbench and the board assembly. · For the disassembly procedure of the major parts and details of the precautions to be taken, see "1.3 Disassembly/assembly method". · If there are wire connections from the Main board and Mechanism assemblies to the other major parts, be sure to remove them ( including wires connected to the major parts ) first before performing step (2). · When carrying out diagnosis and repair of the Main board assembly in the "Service position", be sure to ground both the Main board and Mechanism assemblies. If they are improperly grounded, there may be noise on the playback picture or FDP counter display may move even when the mechanism is kept in an inoperative status. · In order to diagnose the playback or recording of the cassette tape, set the Mechanism assembly to the required mode before placing it upside down. If the mechanism mode is changed (including ejection) while it is in an upside down position the tape inside may be damaged.
Terminal board assembly
CN916

1.5 Mechanism service mode This model has a unique function to enter the mechanism into every operation mode without loading of any cassette tape. This function is called the "Mechanism service mode". 1.5.1 How to set the "Mechanism service mode" (1) Unplug the power cord plug from the power outlet. (2) Connect TPGND and TP7001(TEST) on the Main board assembly with a jump wire. (3) Insert the power cord plug into the power outlet. (4) With lock levers (A) (B) on the left and right of the Cassette holder assembly pulled toward the front, slide the holder in the same direction as the cassette insertion direction. (For the positions of lock levers (A) (B), refer to the "Procedures for lowering the Cassette holder assembly" of 1.3 Disassembly/assembly method.) (5) The cassette holder lowers and, when the loading has completed, the mechanism enters the desired mode. 1.6 Jig RCU mode

This unit uses the following two modes for receiving remote control codes. 1) User RCU mode : Ordinary mode for use by the user. 2) Jig RCU mode : Mode for use in production and servicing. When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). As both of the above two modes are stored in the EEPROM, it is required to set the VCR back to the User RCU mode each time that an adjustment is made or to check that the necessary operations have been completed. These modes can be set by the operations described below. 1.6.1 Setting the Jig RCU mode (1) Unplug the power cord plug from the power outlet. (2) Press and hold the "REC" and "PAUSE" buttons on the VCR simultaneously, while plugging the power cord plug into the power outlet. When the VCR is set to the Jig RCU mode, the symbols ( " : " ) in the time display of the FDP are turned off. 1.6.2 Setting the User RCU mode (1) Turn off the power. (2) Press the "REC" and "PAUSE" buttons of the VCR simultaneously. Alternatively, transmit the code "80" from the Jig RCU. 1.7 Servicing items related to video navigation The video navigation function built into this unit works by storing the video navigation data in the internal EEPROM and writing data in the cassette tape simultaneously. The video navigation data stored in the EEPROM cannot be copied to another EEPROM. Therefore, when the circuit board mounting the EEPROM is replaced, the original EEPROM should be mounted on the new board. This will make the user's video navigation data usable with the new circuit board after replacement. However, the user's data cannot be restored if the EEPROM on the original circuit board is damaged. Note: · If the circuit board mounting the EEPROM or the EEPROM alone has been replaced, it is required to perform confirmation/re-adjustment on all of the adjustment items using the EVR as well as those which are adjusted by transmitting adjustment codes from the Jig RCU.

TP106 PB. FM TP111 D.FF

TP4001 CTL. P

Main board assembly
CP3002

TP2253 A.PB. FM

C3025 Timer Clock VR1401 D/A LEVEL ADJ TPGND

CN7001 CN7002

TP7001 TEST

S Jack board assembly

Demodulator board assembly

3D/TBC(2M) board assembly

Mini front board assembly ADV. Jog board assembly

CN7005

CN7003

Fig. 1-4-1a 1-4

1.8 Emergency display function This unit has a function for storing the history of the past two emergencies (EMG) and displaying them on each FDP (or OSD). With the status of the VCR and mechanism at the moment an emergency occurred can also be confirmed.
FDP display model [FDP display] 0 : 00 : 00 E: * * : * * *1: *2 : 34 *5: *6 : *7 Normal display EMG content display (E:Latest:Previous) EMG detail information <1> EMG detail information <2>

Notes: · The EMG detail information <1><2> show the information on the latest EMG. It becomes " : : " when there is no latest EMG record. · When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received).
Jig RCU [Data transmitting method] Depress the " " ( 3 ) button after the data code is set.

INITIAL MODE CUSTOM CODE 43: A CODE DATA CODE

Fig. 1-8a Jig RCU [PTU94023B] 1.8.1
FDP (7segment LED) display model [FDP display]

Displaying the EMG information

(1) Transmit the code "59" from the Jig RCU. The FDP shows the EMG content in the form of "E: * * : * * ".
E : 01 : 03 Previous EMG Latest EMG E : : No EMG record

0: 00 E: ** 1: ** 2: *1 3: *2 4: 34 5: *5 6: *6 7: *7

Normal display EMG content display (Latest) EMG content display (Previous) EMG detail information <1> [Deck operation mode] EMG detail information <1> [Mechanism operation mode] EMG detail information <1> [Mechanism sensor information and Mechanism mode position] EMG detail information <2> [Type of the cassette tape in use <1>] EMG detail information <2> [Winding position of the cassette tape in use] EMG detail information <2> [Type of the cassette tape in use <2> (Winding area)]

(2) Transmit the code "59" from the Jig RCU again. The FDP shows the EMG detail information <1> in the form of " * 1 : * 2 : 34 ". * 1 : Deck operation mode at the moment of EMG * 2 : Mechanism operation mode at the moment of EMG 3 : Mechanism sensor information at the moment of EMG 4 : Mechanism mode position at the moment of EMG (3) Transmit the code "59" from the Jig RCU once again. The FDP shows the EMG detail information <2> in the form of " * 5 : * 6 : * 7 ". * 5 : Type of the cassette tape in use <1> . * 6 : Winding position of the cassette tape in use * 7 : Type of the cassette tape in use <2> (Winding area) (4) Transmit the code "59" from the Jig RCU once again to reset the display.

OSD display model [OSD display]

EMG E: * * : * * *1: *2 : 34 *5: *6 : *7

EMG content display (E:Latest:Previous) EMG detail information <1> EMG detail information <2>

Notes: · For the OSD display model, all EMG information are showed by transmitting first code from the Jig RCU. · For the EMG content, see "1.8.3 EMG content description". · For the EMG detail information <1> , see "1.8.4 EMG detail information <1> ". · For the EMG detail information <2> , see "1.8.5 EMG detail information <2>". 1.8.2 Clearing the EMG history

(1) Display the EMG history. (2) Transmit the code "36" from the Jig RCU. (3) Reset the EMG display.

(EMG-02e)

1-5

1.8.3

EMG content description

Note: EMG contents "E08/E09" are for the model with Dynamic Drum (DD).

FDP
E01: Loading EMG

CONTENT
When the mechanism mode cannot be changed to another mode even when the loading motor has rotated for more than 4 seconds in the loading direction, [E:01] is identified and the power is turned off.

CAUSE
1. The mechanism is locked in the middle of mode transition. 2. The mechanism is locked at the loading end due to the encoder position reading error during mode transition. 3. Power is not supplied to the loading MDA. 1. The mechanism is locked in the middle of mode transition. 2. The mechanism is locked at the unloading end due to the encoder position reading error during mode transition. 3. Power is not supplied to the loading MDA. 1. The take-up reel pulse is not generated in the FWD transport modes (PLAY/ FWD SEARCH/FF, etc.) because; 1) The idler gear is not meshed with the take-up reel gear; 2) The idler gear is meshed with the take-up reel gear, but incapable of winding due to too large mechanical load (abnormal tension); 3) The take-up reel sensor does not output the FG pulse. 2. The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.) because; 1) The idler gear is not meshed with the supply reel gear. 2) The idler gear is meshed with the supply reel gear, but incapable of winding due to too large a mechanical load (abnormal tension); 3) The supply reel sensor does not output the FG pulse. 3. Power is not supplied to the reel sensors. 1. The drum could not start or the drum rotation has stopped due to too large a load on the tape, because; 1) The tape tension is abnormally high; 2) The tape is damaged or a foreign object (grease, etc.) adheres to the tape. 2. The drum FG pulse did not reach the System controller CPU because; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (hall device) of the drum is faulty. 3. The drum control voltage (DRUM CTL V) is not supplied to the MDA. 4. Power is not supplied to the drum MDA. 1. The cassette cannot be ejected due to a failure in the drive mechanism of the housing. 2. When the housing load increases during ejection, the loading motor is stopped because of lack of headroom in its drive torque. Housing load increasing factors: Temperature environment (low temperature, etc.), mechanism wear or failure. 3. The sensor/switch for detecting the end of ejection are not functioning normally. 4. The loading motor drive voltage is lower than specified or power is not supplied to the motor (MDA). 5. When the user attempted to eject a cassette, a foreign object (or perhaps the user's hand) was caught in the opening of the housing. 1. The capstan could not start or the capstan rotation has stopped due to too large a load on the tape, because; 1) The tape tension is abnormally high (mechanical lock); 2) The tape is damaged or a foreign object (grease, etc.) is adhered to the tape (occurrence of tape entangling, etc.). 2. The capstan FG pulse did not reach the System controller CPU because; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (MR device) of the capstans is faulty. 3. The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA. 4. Power is not supplied to the capstan MDA. 1. The SW 5 V power supply circuit is shorted with GND. 2. The SW 12 V power supply circuit is shorted with GND. 1. The absolute value sensor is defective. (The soldered parts have separated.) 2. The pull-up resistor at the absolute sensor output is defective. (The soldered parts have separated.) 3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the absolute value sensor. 4. The absolute value sensor data is not sent to the System Controller CPU. 1. The FG sensor is defective. (The soldered parts have separated.) 2. The pull-up resistor at the FG sensor output is defective. (The soldered parts have separated.) 3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor. 4. The power to the sensor is not supplied. (Connection failure/soldering failure) 5. The FG pulse is not sent to the System Controller CPU. 6. The tilt motor is defective. (The soldered parts have separated.) 7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure) 8. The tilt motor drive MDA - IC is defective. 9. Auto-recovery of the DD tilting cannot take place due to overrun. 1. The supply reel pulse is not generated in the FWD transport mode (PLAY/ FWD SEARCH/FF, etc.) because; 1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cassette is cut in the middle; 2) A mechanical factor caused tape slack inside and outside the supply reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the FWD transport, so the pulse is not generated until then; 3) The FG pulse output from the supply reel sensor is absent. 2. The take-up reel pulse is not generated in the REV transport mode (REV SEARCH/REW, etc.). 1) REV SEARCH/REW is started when the tape in the inserted cassette has been cut in the middle; 2) A mechanical factor caused tape slack inside and outside the take-up reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the REV transport, so the pulse will not be generated until that time; 3) The FG pulse output from the take-up reel sensor is absent. 3. The power to a reel sensor is not supplied.

E02: Unloading EMG When the mechanism mode cannot be changed to another mode even when the loading motor has rotated for more than 4 seconds in the unloading direction, [E:02] is identified and the power is turned off. E03: Take Up Reel Pulse EMG When the take-up reel pulse has not been generated for more than 4 seconds in the capstan rotating mode, [E:03] is identified, the pinch rollers are turned off and stopped, and the power is turned off. However, the reel EMG is not detected in STILL/SLOW modes.

E04: Drum FG EMG

When the drum FG pulse has not been input for more than 3 seconds in the drum rotating mode, [E:04] is identified, the pinch rollers are turned off and stopped, and the power is turned off.

E05: Cassette Eject When the eject operation does not complete in 3 seconds after the start, [E:05] is identified, the pinch rollers EMG are turned off and stopped, and the power is turned off. When the cassette insertion operation does not complete in 3 seconds after the start, the cassette is ejected. In addition, when the operation does not complete within 3 seconds after the start, [E:05] is also identified and the power is turned off immediately.

E06: Capstan FG EMG

When the capstan FG pulse has not been generated for more than 1 second in the capstan rotating mode, [E:06] is identified, the pinch rollers are turned off and stopped, and the power is turned off.However, the capstan EMG is not detected in STILL/SLOW/FF/REW modes.

E07: SW Power Short-Circuit EMG E08: DD Initialized (Absolute Position Sensor) EMG

When short-circuiting of the SW power supply with GND has lasted for 0.5 second or more, [E:07] is identified, all the motors are stopped and the power is turned off. When DD tilting does not complete in 4 seconds, [E:08] is identified, the tilt motor is stopped and the power is turned off.

E09: DD FG EMG

When the DD FG pulse is not generated within 2.5 seconds, [E:09] is identified, the tilt motor is stopped and the power is turned off.

E0A:Supply Reel Pulse EMG

When the supply reel pulse has not been generated for more than 10 seconds in the capstan rotating mode, [E:0A] is identified and the cassette is ejected (but the power is not turned off). However, note that the reel EMG is not detected in the SLOW/STILL mode.

Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output EC1 or EU1: Head clog warning channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:C1] or [E:U1] is identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the "3-second warning display" and "7-second noise picture display" alternately. EMG code : "E:C1" or "E:U1" / FDP : "U:01" / OSD : "Try cleaning tape." or "Use cleaning cassette." The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is changed to another mode than PLAY.

1-6

Table 1-8-3a

1.8.4

EMG detail information <1>

The status (electrical operation mode) of the VCR and the status (mechanism operation mode/sensor information) of the mechanism in the latest EMG can be confirmed based on the figure in EMG detail information <1> . [FDP/OSD display] * 1 : * 2 : 34 *1 : *2 : 3 : 4 : Deck operation mode at the moment of EMG Mechanism operation mode at the moment of EMG Mechanism sensor information at the moment of EMG Mechanism mode position at the moment of EMG

* 2 : Mechanism operation mode [Common table of MN* and M3*]
Display MN* M3* 00 00 02 02 04 04 06 06 08 08 0A 0C 0E 10 12 14 16 18 1A 1C 1E 20 22 24 26 28 2A 2C 2E 80 0A 0C 0E 10 12 14 16 18 1A 1C 1E 20 22 24 26 28 2A 2C 2E 30 80 Mechanism operation mode Command standby (Status without executing command) POWER OFF by EMG occurrence Moving to the adjacent position in the LOAD direction Moving to the adjacent position in the UNLOAD direction Cassette ejection being executed / Cassette housing ejection being executed Mode transition to STOP with cassette ejection end Cassette insertion being executed Tape being loaded Tape being unloaded Mode transition to STOP with pinch roller compression ON Mode transition to STOP with pinch roller compression OFF Mode transition to STOP with pinch roller compression OFF as a result of POWER OFF Mode transition to STOP with pinch roller compression ON as a result of POWER ON Mode transition to PLAY Mode transition to FWD SEARCH Mode transition to REC Mode transition to FWD STILL / SLOW Mode transition to REV STILL / SLOW Mode transition to REV SEARCH Mode transition from FF / REW to STOP Mode transition to FF Mode transition to REW 4 sec. of REV as a result of END sensor going ON during loading Short FF / REV as a result of END sensor going ON during unloading Mechanism position being corrected due to overrun Mechanism in initial position (Dummy command)

Note: · For EMG detailed information <1>, the content of the code that is shown on the FDP (or OSD) differs depending on the parts number of the system control microprocessor (IC3001) of the VCR. The system control microprocessor parts number starts with two letters, refer these to the corresponding table. * 1 : Deck operation mode [Common table of MN*, HD* and M3*]
Display Deck operation mode MN*/M3* HD* 00 Mechanism being initialized 01 00 STOP with pinch roller pressure off (or tape present with P.OFF) 02 01 STOP with pinch roller pressure on 03 POWER OFF as a result of EMG 04 04 PLAY 0C 0E REC 10 11 Cassette ejected 20 22 FF 21 Tape fully loaded, START sensor ON, short FF 22 Cassette identification FWD SEARCH before transition to FF (SP x7-speed) 24 26 FWD SEARCH (variable speed) including x2-speed 2C 2E INSERT REC 40 43 REW 42 Cassette identification REV SEARCH before transition to REW (SP x7-speed) 44 47 REV SEARCH (variable speed) 4C 4C AUDIO DUB 6C 6E INSERT REC (VIDEO + AUDIO) 84 84 FWD STILL / SLOW 85 85 REV STILL / SLOW 8C 8F REC PAUSE 8D Back spacing 8E Forward spacing (FWD transport mode with BEST function) AC AF INSERT REC PAUSE AD INSERT REC back spacing CC CD AUDIO DUB PAUSE CD AUDIO DUB back spacing EC EF INSERT REC (VIDEO + AUDIO) PAUSE ED INSERT REC (VIDEO + AUDIO) back spacing

[Table of HD*]
Display 00 01 02 04 05 0E 11 22 26 2E 43 47 4C 6E 84 85 8F AF C7 CD EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE Mechanism operation mode STOP with pinch roller pressure off STOP with pinch roller pressure on U/L STOP (or tape being loaded) PLAY PLAY (x1-speed playback using JOG) REC Cassette ejected FF FWD SEARCH (variable speed) including x2-speed INSERT REC REW REV SEARCH AUDIO DUB INSERT REC (VIDEO + AUDIO) FWD STILL/SLOW REV STILL/SLOW REC PAUSE INSERT REC PAUSE REV SEARCH (x1-speed reverse playback using JOG) AUDIO DUB PAUSE INSERT REC (VIDEO + AUDIO) PAUSE Mechanism being initialized POWER OFF as a result of EMG Cassette being inserted Cassette being ejected Transition from STOP with pinch roller pressure on to STOP with pinch roller pressure off Transition from STOP with pinch roller pressure on to PLAY Transition from STOP with pinch roller pressure on to REC Cassette type detection SEARCH before FF/REW is being executed Tape being unloaded Transition from STOP with pinch roller pressure off to STOP with pinch roller pressure on Transition from STOP with pinch roller pressure off to FF/REW Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.) Transition from STOP with pinch roller pressure off to cassette type detection SEARCH Short REV being executed after END sensor on during unloading Tension loosening being executed after tape loading (STOP with pinch roller pressure on)

1-7

3 : Mechanism sensor information [Common table of MN*, HD* and M3*]
Mechanism sensor information Display MN* / HD* S-VHS SW 0123456789ABCDEFVHS VHS VHS VHS VHS VHS VHS VHS S-VHS S-VHS S-VHS S-VHS S-VHS S-VHS S-VHS S-VHS M3* CASS SW Cassette insertion Cassette insertion Cassette insertion Cassette insertion Cassette insertion Cassette insertion Cassette insertion Cassette insertion Cassette ejection Cassette ejection Cassette ejection Cassette ejection Cassette ejection Cassette ejection Cassette ejection Cassette ejection REC safety SW Tab broken Tab broken Tab broken Tab broken Tab present Tab present Tab present Tab present Tab broken Tab broken Tab broken Tab broken Tab present Tab present Tab present Tab present Start sensor ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF End sensor ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF

Note: · EMG detail information <2> is the reference information stored using the remaining tape detection function of the cassette tape. As a result, it may not identify cassette correctly when a special cassette tape is used or when the tape has variable thickness. * 5 : Cassette tape type <1>
Display 00 16 82 84 92 93 C3 D3 E1 E2 E9 F1 Cassette tape type <1> Cassette type not identified Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified Small reel, thick tape (T-120) identified/thin tape (T-140) identified Large reel (T-0 to T-60) identified Small reel, thick tape (T-130) identified/thin tape (T-160 to T-210) identified Small reel, thick tape/C cassette (T-0 to T-100/C cassette) not classified Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified C cassette, thick tape (TC-10 to TC-20) identified Small reel, thick tape (T-0 to T-100) identified C cassette, thin tape (TC-30 to TC-40) identified C cassette, thick tape/thin tape (TC-10 to TC-40) not classified

4 : Mechanism mode position [Common table of MN*, HD* and M3*]
Display MN* HD* M3* -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -A -B -C -D -E -F -7 -0 -7 -1 -7 -2 -7 -3 -7 -4 -7 -5 -7 -6 -7 -6 -0 -1 -2 -3 -4 -5 -6 -F -F -F -E -D -C -B -A -9 -8 -7 Initial value EJECT position EJECT position (Cassette housing drive mode) Housing operating Between EJECT and U / L STOP U / L STOP position Guide arm drive position Tape being loaded / unloaded (When the pole base is located on the front side of the position just beside the drum) Tape being loaded / unloaded (When the pole base is located on the rear side of the position just beside the drum) Pole base compressed position FF / REW position Between FF / REW and STOP with pinch roller compression ON STOP with pinch roller compression OFF Between STOP with pinch roller compression OFF and REV REV (REV STILL / SLOW) position REV position Between REV and REV STILL / SLOW REV STILL / SLOW position Between REV and FWD Between REV STILL / SLOW and FWD STILL / SLOW FWD (FWD STILL / SLOW) position FWD STILL / SLOW position Between FWD and PLAY Between FWD STILL / SLOW and PLAY PLAY position Mechanism mode position

Notes: · Cassette tape type <1> is identified a few times during mode transition and the identification count is variable depending on the cassette tape type. If an EMG occurs in the middle of identification, the cassette tape type may not be able to be identified. · If other value than those listed in the above table is displayed, the cassette tape type is not identified. * 6 : Cassette tape winding position The cassette tape winding position at the moment of EMG is displayed by dividing the entire tape (from the beginning to the end) in 22 sections using a hex number from "00" to "15". "00" : End of winding "15" : Beginning of winding "FF or " : Tape position not identified * 7 : Cassette tape type <2> (Winding area)
Display Cassette tape type <2>

Note: · In the case of the "HD*" microprocessor, as the display is always "-7" at any intermediate position between modes, the position of transitory EMG may sometimes not be located.

1.8.5

EMG detail information <2>

The type of the cassette tape and the cassette tape winding position can be confirmed based on the figure in EMG detail information <2> . [FDP/OSD display] *5 : *6 *5 : *6 : *7 : : *7 Type of the cassette tape in use <1> Winding position of the cassette tape in use Type of the cassette tape in use <2> (Winding area)

00 07 08 - 0E 09 - 15 0A - 0B 0A - 16 0A - 16 0D - 0F 11 - 14 15 - 18 17 - 1A 19 - 1D 1D - 21 1E - 1F 1F - 23 21 - 23 21 - 23 22 - 24 22 - 24 22 - 24 22 - 23 23 - 24 25 - 26 27 - 29 29 - 2B 2D - 2F

Cassette type not identified Small reel, thick tape C cassette, thick tape C cassette, thick tape Small reel, thick tape C cassette, thin tape C cassette, thin tape Small reel, thick tape Small reel, thick tape Small reel, thick tape Small reel, thick tape Small reel, thick tape Small reel, thick tape Small reel, thin tape Small reel, thick tape Small reel, thin tape Small reel, thin tape Small reel, thick tape Small reel, thin tape Small reel, thin tape Large reel Large reel Large reel Large reel Large reel Large reel

T-5 TC-10 TC-20P T-20 TC-30 TC-40 T-40 T-60 T-80 / DF-160 T-90 / DF-180 T-100 T-120 / DF-240 T-140 T-130 T-160 T-168 DF-300 T-180 / DF-360 T-210 / DF-420 T-5 T-10 T-20 T-30 T-40 T-60

Note: · The values of cassette tape type <2> in the above table are typical values with representative cassette tapes.

1-8

SECTION 2 MECHANISM ADJUSTMENT
2.1 Before starting repair and adjustment 2.1.1 Precautions (1) Unplug the power cord plug of the VCR before using your soldering iron. (2) Take care not to cause any damage to the conductor wires when plugging and unplugging the connectors. (3) Do not randomly handle the parts without identifying where the trouble is. (4) Exercise enough care not to damage the lugs, etc. during the repair work. (5) When reattaching the front panel assembly, make sure that the door opener of the cassette holder assembly is lowered in position prior to the reinstallation. (See SECTION 1 DISASSEMBLY.) (6) When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). (See SECTION 1 DISASSEMBLY.)
Loading motor

2.1.2 Checking for proper mechanical operations Enter the mechanism service mode when you want to operate the mechanism when no cassette is loaded. (See SECTION 1 DISASSEMBLY.)

Pole base assembly

Fig. 2-1-3a 2.1.3 Manually removing the cassette tape 1. In case of electrical failures If you cannot remove the cassette tape which is loaded because of any electrical failure, manually remove it by taking the following steps. (1) Unplug the power cord plug from the power outlet. (2) Refer to the disassembly procedure and perform the disassembly of the major parts before removing the drum assembly. (3) Unload the pole base assembly by manually turning the loading motor of the mechanism assembly toward the front. In doing so, hold the tape by the hand to keep the slack away from any grease. (See Fig.2-1-3a.) (4) Bring the pole base assembly to a pause when it reaches the position where it is hidden behind the cassette tape. (5) Move the top guide toward the drum while holding down the lug (A) of the bracket retaining the top guide. Likewise hold part (B) down and remove the top guide. Section (C) of the top guide is then brought under the cassette lid. Then remove the top guide by pressing the whole cassette tape down. (See Fig.2-1-3b.) (6) Remove the cassette tape by holding both the slackened tape and the cassette lid. (7) Take up the slack of the tape into the cassette. This completes removal of the cassette tape. Note: · For the disassembly procedure of the major parts and details of the precautions to be taken, see "SECTION 1 DISASSEMBLY".

(C) (A)
(B)

Press

Fig. 2-1-3b

2-1

2. In case of mechanical failure If you cannot remove the cassette tape which is loaded because of any mechanical failure, manually remove it by taking the following steps. (1) Unplug the power cable and remove the top cover, front panel assembly and others so that the mechanism assembly is visible. (See SECTION 1 DASASSEMBLY.) (2) While keeping the tension arm assembly of the mechanism assembly free from tension, pull the tape on the pole base assembly (supply or take-up side) out of the guide roller. (See Fig.2-1-3c.) (3) Take the spring of the pinch roller arm assembly off the hook of the press lever assembly, and detach it from the tape. (See Fig.2-1-3d.) (4) In the same way as in the electrical failure instructions in 2.1.3-1(5), remove the top guide. (5) Raise the cassette tape cover. By keeping it in that position, draw out the cassette tape case from the cassette holder and take out the tape. (6) By hanging the pinch roller arm assembly spring back on the hook, take up the slack of the tape into the cassette.

2.1.4 Jigs and tools required for adjustment
Roller driver PTU94002 A/C head positioning tool PTU94010 Torque gauge PUJ48075-2

Back tension cassette gauge PUJ48076-2

Jig RCU PTU94023B

Alignment tape (SP, stairstep, PAL) MHPE

Alignment tape (LP, stairstep, PAL) MHPE-L

Pole base assembly (take-up side)

Pole base assembly (supply side)

Tension arm assembly

Fig. 2-1-3c

Take the spring off the hook, and detach it from the tape.

Pinch roller arm assembly Guide pole guard Press lever assembly

Fig. 2-1-3d 2-2

2.1.5 Maintenance and inspection 1. Location of major mechanical parts In this chapter, the two mechanism speeds are described by comparing the speeds of the standard type and the high-speed FF/REW type. It is possible to distinguish between these two types of mechanism by the diameters of their capstan pulleys. The capstan pulley diameter for the standard type is approx. 32 mm. The capstan pulley diameter for the high-speed FF/REW type is approx. 43 mm. For information on the different parts used in the two mechanism types, please refer to the "Replacement of major parts".
T1 UV catcher2 (supply and take-up side) T3 Drum assembly T2 Stator assembly T5 Head base T6 A/C head T7 Loading motor

T8 Guide pole guard

T26 Full erase head

T9 Pinch roller arm
assembly

T10 Lid guide T11 Press lever
assembly

T25 Pole base assembly
(supply side)

T12 Guide arm
assembly

T24 Tension arm
assembly

T13 Reel disk T23 Adjust pin T22 Tension brake
assembly

(take-up side)

T14 Sub brake assembly
(take-up side)

T20 (supply side) T21 Rec safety lever
(supply side)

Reel disk

T15 Main brake assembly T18 Idler lever T16 Idler arm assembly
(take-up side)

T19 Main brake assembly

T17 Pole base assembly (take-up side)

Fig. 2-1-5a
B1 Capstan motor

Mechanism assembly top side
B3 Capstan brake assembly B5 Loading arm gear (supply side)

B2 Belt (capstan)

B4 Loading arm gear (take-up side) B6 Plate
(supply side)

B22 Belt
(loading motor)

B7 Control
bracket1

B21 Worm gear

B20 Control cam B8 Control plate

B19 Brake lever

B9 Tension arm
bearing

B18 Cassette gear

B17 Link lever

B15 Rotary encoder B16 Rotary encoder guide

B13 Direct gear

B10 Take-up head B12 Clutch unit

B11 Take-up lever

B14 Change lever assembly

Fig. 2-1-5b

Mechanism assembly bottom side 2-3

L1 Guide rail

L2 Roller cam assembly

4. Suggested servicing schedule for main components The following table indicates the suggested period for such service measures as cleaning,lubrication and replacement. In practice, the indicated periods will vary widely according to environmental and usage conditions.However, the indicated components should be inspected when a set is brought for service and the maintenance work performed if necessary. Also note that rubber parts may deform in time,even if the set is not used.
System Parts Name Upper drum assembly A/C head Operation Hours ~1000H ~2000H

Fig. 2-1-5c

Mechanism assembly left side

R1 Opener guide

R2 Door
opener

Lower drum assembly Pinch roller arm assembly Full erase head Tension arm assembly Capstan motor (Shaft) Guide arm assembly

R3 Drive gear

R5 Limit gear
Worm gear

Loading motor

R4 Cassette housing bracket

Belt (loading motor)

¤R ¤R ¤ ¤ ¤ ¤ ¤ ¤

Fig. 2-1-5d

Mechanism assembly right side

Capstan motor Capstan brake assembly Main brake assembly

2. Cleaning Regular cleaning of the transport system parts is desirable but practically impossible. So make it a rule to carry out cleaning of the tape transport system whenever the machine is serviced. When the video head, tape guide and/or brush get soiled, the playback picture may appear inferior or at worst disappear, resulting in possible tape damage. (1) When cleaning the upper drum (especially the video head), soak a piece of closely woven cloth or Kimu-wipe with alcohol and while holding the cloth onto the upper drum by the fingers, turn the upper drum counterclockwise. Note: · Absolutely avoid sweeping the upper drum vertically as this will cause damage to the video head. (2) To clean the parts of the tape transport system other than the upper drum, use a piece of closely woven cloth or a cotton swab soaked with alcohol. (3) After cleaning, make sure that the cleaned parts are completely dry before using the video tape. 3. Lubrication With no need for periodical lubrication, you have only to lubricate new parts after replacement. If any oil or grease on contact parts is soiled, wipe it off and newly lubricate the parts. Note: · See the "mechanism assembly" diagram of the parts list for the lubricating or greasing spots, and for the types of oil or grease to be used.

Drive

Belt (Capstan) Belt (Loading motor) Loading motor Clutch unit Worm gear Control plate

R

Other

Brush Tension brake assembly Rotary encoder

¤R R

R ¤R ¤R ¤ ¤ ¤ ¤ ¤ R R R R R R R R R ¤R R R

¤: R:

Tape transport

Cleaning Inspection or replacement if necessary

Table 2-1-5a

5. Disassembling procedure table The following table indicates the order in which parts are removed for replacement. To replace parts, remove them in the order of 1 to 18 as shown in the table. To install them, reverse the removal sequence. The symbols and numbers preceding the individual part names represent the numbers in the "Location of major mechanical parts" table. Also, the "T", "B", and "T/B" on the right of each part name shows that the particular part is removed from the front, from the back, and from both sides of the mechanism, respectively.

2-4

Symbols and numbers

L1

L2

R4 R1

R3

T9 T12 T11 T1 B15 B12 B14 B13

B17 B21 B7 B8

B5

B4 B11 T14 T15 T13 T22 T24 T18 B19

Loading arm gear (take-up side)

Loading arm gear (supply side)

Removal parts

Main brake assembly (take-up side)

Sub brake assembly (take-up side)

Front (T)/Back (B) of mechanism

Cassette holder assembly

Pinch roller arm assembly

Cassette housing bracket

Number of removal steps

Tension brake assembly

Reel disk (take-up side)

Change lever assembly

Tension arm assembly

Symbols and numbers

Press lever assembly

Roller cam assembly

Guide arm assembly

Control bracket1

(Reference items) Replacement parts 2.2.3 Guide rail 2.2.3 Roller cam assembly 2.2.3 Cassette housing bracket 2.2.3 Opener guide 2.2.3 Door opener 2.2.3 Relay gear 2.2.3 Limit gear 2.2.3 Cassette holder assembly 2.2.3 Drive gear 2.2.3 Drive arm 2.2.4 Pinch roller arm assembly 2.2.5 Guide arm assembly 2.2.5 Press lever assembly 2.2.6 A/C head 2.2.7 Loading motor 2.2.8 Capstan motor 2.2.9 UV catcher2 2.2.9 Pole base assembly (take-up side) 2.2.9 Pole base assembly (supply side) 2.2.10 Rotary encoder 2.2.11 Clutch unit 2.2.12 Change lever assembly 2.2.12 Direct gear 2.2.12 Coupling gear 2.2.12 Clutch gear 2.2.13 Link lever 2.2.14 Cassette gear 2.2.14 Control cam 2.2.14 Worm gear - Lid guide 2.2.15Control bracket1 2.2.15Control plate 2.2.16Loading arm gear (supply side) 2.2.16Loading arm gear (take-up side) 2.2.16Loading arm gear shaft 2.2.17Take-up lever 2.2.17Take-up head 2.2.17Control plate guide 2.2.18Capstan brake assembly 2.2.19Sub brake assembly(take-up side) 2.2.20Main brake assembly(take-up side) 2.2.20Main brake assembly(supply side) 2.2.20Reel disk (take-up side) 2.2.21Tension brake assembly 2.2.21Reel disk (supply side) 2.2.21Tension arm assembly 2.2.21Tension arm bearing 2.2.22Idler lever 2.2.22Idler arm assembly - Brake lever (*1) - Rotary encoder guide

L1 L2 R4 R1 R2

R5

R3

T9 T12 T11 T6 T7 B1 T1 T17 T25 B15 B12 B14 B13

B17 B18 B20 B21 T10 B7 B8 B5 B4

B11 B10

B3 T14 T15 T19 T13 T22 T20 T24 B9 T18 T16 B19 B16

T T T T T T T T T T T T T T T T/B T T/B T/B B B B B B B B B B B T/B B B B B B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B T/B

1 1 1 2 3 3 3 6 4 8 1 1 3 1 1 1 1 2 2 1 1 3 4 5 6 1 2 2 1 5 1 6 7 8 9 7 8 8 7 15 16 9 16 9 10 10 10 17 18 18 19

1 1 1 1 1 1 2 2 3 1 3 2 2 2 4 2 4 5 3 5

6

7

1

2

1 1

1 1 1 1

2 2 2 2

3 3 3 4 4 5 1 1

1

2

3 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 12 12 12

4 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 7 7 8 7 7

1 1 1 1 1 1 1 1 1 1 1 1

2 2 2 2 2 2 2 2 2 2 2 2

3 3 3 3 3 3 3 3 3 3 3 3

4 4 4 4 4 4 4 4 4 4 4 4

5 5 5 5 5 5 5 5 5 5 5 5

6 6 6 6 6 6 6 6 6 6 6 6

7 7 7 7 7 7 7 7 7 7 7 7

8 8 8 8 8 8 8 8 8 8 8 8

9 10 11 9 10 11 9 10 11

13 14 13 14 13 14 15 15 9 9 9 15 16 15 16 17 15 16 17 15 16 17 18

9 10 11 9 10 11 9 10 11 9 10 11

12 12 12 12

13 14 13 14 13 14 13 14

Table 2-1-5b Note: · The parts with marked ( ) have different types of mechanisms (standard type or high-speed FF/REW type). 1 : Uses the standard type mechanism only. 2 : Uses the high-speed FF/REW type mechanism only.

*

* *

Brake lever (*1)

Rotary encoder

Take-up lever

Opener guide

Control plate

UV catcher2

Coupling gear

Worm gear

Direct gear

Relay gear

Clutch unit

Drive gear

Idler lever

Drive arm

Guide rail

Link lever

2-5

2.2 Replacement of major parts 2.2.1 Before starting disassembling (Phase matching between mechanical parts) The mechanism of this unit is closely linked with the rotary encoder and system controller circuits. Since the system controller detects the status of mechanical operation in response to phases of the rotary encoder (internal switch positions), the mechanism may not operate properly unless such parts as the rotary encoder, control plate, loading arm gear, control cam, cassette gear, limit gear, relay gear and drive gear are installed in their correct positions. Especially, this model is not provided with any cassette housing assembly, so that cassette loading and unloading must be accomplished by operation of the cassette holder assembly. The latter is in turn driven by such parts as the drive gear, relay gear and limit gear. Exercise enough care, therefore, to have the phases of all this gear matching one another. (For information on phase matching of the mechanism, see the instructions on how to install individual parts.) This unit is provided with a mechanism assembly mode. It is therefore necessary to enter this mode for assembling and disassembling procedures. This mode is usually not in use, manually set it when it is required. 2.2.2 How to set the "Mechanism assembling mode" Remove the mechanism assembly and place it bottom side up. (See SECTION 1 DISASSEMBLY.) Turn the worm gear toward the front so that the guide hole of the control cam is brought into alignment with the hole at the mechanism assembly chassis. This position renders the mechanism assembling mode operational. Make sure that the control plate is located in alignment with the mark E. (See Fig.2-2-2a.)

2.2.3 Cassette holder assembly 1. How to remove (1) Remove the guide rail and roller cam assembly. (See Fig.2-2-3a.) (3 lugs on the guide rail and one lug on the roller cam assembly)
Guide rail Roller cam assembly

Lugs

Lug

Lug

Fig. 2-2-3a (2) Remove the two slit washers and remove the cassette housing bracket. (See Fig.2-2-3b.) (3) Remove the opener guide, spring(A), door opener, relay gear and limit gear. (See Fig.2-2-3b.)

Limit gear

Spring(A) Opener guide
Chassis hole Worm gear

Relay gear

Door opener

Slit washers Cassette housing bracket

Guide hole

Fig. 2-2-3b
Control cam