Philips VR820 Service Manual

Video Cassette Recorder VR820/55, VR820/75

VR820/55

Contents

Chapter

1 Disassembly

2 Mechanism adjustments

3 Electrical adjustments

4 Charts and diagrams

5 Parts lists

Safety regulations require that the set be restored to its original condition and that parts which are identical with those specified be used.

Specification:

Video recording system: Rotary 4-head helical scan system Antenna input Signal: B/G, D/K, I, K1, M Antenna: UVF/UHF 75 W external antenna terminal Video Output Channel: Adjustable between UHFchannel E28 - E60 Power requirement: AC 110V  240V, ~ 50/60Hz Power consumption: 18 watts Operating temperature: +41°F (5°C) to 104°F (40°C) Relative humidity: 10% to 80% Weight: 3.0kg Dimensions: 435 x 102 x 342mm

Published by CFC2001PJVM Videq Service Department Printed in the Netherlands © Copyright reserved Subject to modification

OOC82055.pm5

3103 785 20970

TABLE OF CONTENTS

Section Title Page

1. DISASSEMBLY

1.1 DISASSEMBLY FLOW CHART.............................................................................................................. 1-1

1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY ....................................................................... 1-1

1.3 DISASSEMBLY/ASSEMBLY METHOD ................................................................................................. 1-1

1.4 SERVICE POSITION .............................................................................................................................. 1-4

1.5 MECHANISM SERVICE MODE ............................................................................................................. 1-4

1.6 JIG RCU MODE ..................................................................................................................................... 1-5

1.7 SERVISING ITEMS RELATED TO VIDEO NAVIGATION ........................................................................ 1-5

1.8 EMERGENCY DISPLAY FUNCTION ...................................................................................................... 1-6

2. MECHANISM ADJUSTMENT

2.1 BEFORE STARTING REPAIR AND ADJUSTMENT ................................................................................ 2-1

2.2 REPLACEMENT OF MAJOR PARTS .................................................................................................... 2-6

2.3

COMPATIBILITY ADJUSTMENT ....................................................................................................................2-16

3. ELECTRICAL ADJUSTMENT

3.1 PRECAUTION ........................................................................................................................................ 3-1

3.2 SERVO CIRCUIT ................................................................................................................................... 3-2

3.3 VIDEO CIRCUIT ..................................................................................................................................... 3-2

3.4 SYSCON CIRCUIT ................................................................................................................................ 3-2

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) AND AUDIO ERASE SCHEMATIC DIAGRAMS .................................................. 4-5

4.3 MAIN (SYSCON) SCHEMATIC DIAGRAM ............................................................................................. 4-7

4.4 MAIN (SW.REG) SCHEMATIC DIAGRAM .............................................................................................. 4-9

4.5 MAIN (TUNER) SCHEMATIC DIAGRAM ................................................................................................ 4-11

4.6 MAIN (CONNECTION) SCHEMATIC DIAGRAM ..................................................................................... 4-13

4.7 TERMINAL SCHEMATIC DIAGRAM ..................................................................................................... 4.15

4.8 DEMODULATOR SCHEMATIC DIAGRAM ............................................................................................. 4-17

4.9 DISPLAY, REC SAFETY AND JOG SCHEMATIC DIAGRAMS .............................................................. 4-19

4.10 CNR SCHEMATIC DIAGRAM ................................................................................................................ 4-21

4.11 MAIN, CIRCUIT BOARDS ..................................................................................................................... 4-23

4.12 DISPLAY, REC SAFETY AND JOG CIRCUIT BOARDS .........................................................................4-25

4.13 DEMODULATOR AND CNR CIRCUIT BOARDS .................................................................................... 4-25

4.14 TERMINAL CIRCUIT BOARD ................................................................................................................ 4-27

4.15 REMOTE CONTROLLER SCHEMATIC DIAGRAM ................................................................................ 4-28

4.16 FDP GRID ASSIGNMENT AND ANODE CONNECTION ........................................................................4-29

4.17 WAVEFROMS ...................................................................................................................................... 4-30

4.18 VOLTAGE CHARTS ..............................................................................................................................4-31

4.19 CPU PIN FUNCTION ............................................................................................................................. 4-32

4.20 SYSTEM CONTROL BLOCK DIAGRAM ............................................................................................... 4-33

4.21 VIDEO BLOCK DIAGRAM .................................................................................................................... 4-35

4.22 AUDIO BLOCK DIAGRAM .................................................................................................................... 4-37

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBLY ........................................................................................... 5-1

5.2 CABINET AND CHASSIS ASSEMBLY................................................................................................... 5-2

5.3 MECHANISM ASSEMBLY .................................................................................................................... 5-3

T82055

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]

[2]

[3]

[4]

[5]

[6]

[7]

1.2

How to read the disassembly and assembly

Top cover, Bracket

Bottom cover

Front panel assembly,

Jog board assembly

Drum assembly

Mechanism assembly

Rec safety board assembly,

Display board assembly

Main board assembly

Step/

Loc No.

[1] Top cover, D1

(1) (2) (3) (4) (5)

Part Name

Bracket 2(S1c)

Fig. No.

Point Note

4(S1a),(S1b),3(L1a), <Note 1a> 2(SD1a),(P1a),(W1a), CN1(WR1a),

(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

1.3 Disassembly/assembly method

Step/

Loc No.

[1] Top cover, D1 4(S1a)

[2] Bottom cover D2 <Note 2a>

[3] Front panel assembly D3 7(L3a), <Note 3a>

[4] Drum assembly D4 CON1(WR4a), <Note 3a>

[5] Mechanism assembly D5 CN2001(WR5a), <Note 3a>

[6] Rec safety board D6 (L6a) <Note 6a>

[7] Main board assembly D7 2(S7a),(S7b)

• When attaching the Bottom cover, make sure that the earth plate of the Bottom cover is passed through the hole of the Bottom chassis and then touches the GND (Ground) on the Main board assembly.

• 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 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.

• The Jog board assembly can be removed from the front panel rear by pulling it gently toward the front after the screw (S3b) is removed.

• When it is required to remove the screws (S5a to S5b) 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.

• The wire (WR5a) 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.

• The Rec safety board assembly is attached to the Display board assembly. It is therefore necessary to remove the Rec safety board assembly before removing the Display board assembly.

Part Name

Bracket 2(S1c)

(Foot(rear)) 4(L2a) (Foot assy) 4(L2b)

Jog board assembly 2(S3b) <Note 3c>

(Cleaner assy) (L4a)

assembly Display board assembly

Fig. No.

Point Note

-----------------

(S2a),2(S2b),4(L2c), 3(L2d)

CN3012(WR3a) <Note 3b>

--------------------------

CN1(WR4b), (S3a),(S3b),(S3c)

--------------------------

(S5a),(S5b),2(S5c) <Note 5a>

--------------------------

CN7001(WR6a), <Note 3a> CN7191(WR6b), 2(L6b),5(L6c)

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.

(L2b)

(L2c)

(L2d)

(L2b)

(L2a)

(A)

(B)

Fig. 2

Fig. 1

Fig. 3

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.

Procedures for Lowering the Cassette holder assembly

(S1a)

[1] Top cover

Foot assy

WR3a <Note 3a>

(L3a)

(L2c)

[2] Bottom cover

(L2a)

Earth plate <Note 2a>

Fig. D2

CN901

(S2b)

Foot(rear)

(S2a)

1-2

[3] Front panel assembly

(L3a)

Knob (Jog/shuttle)

(S1c)

(S1a)

[1] Bracket

Fig. D1 Fig. D3

WR3b

(S3b)

(L3a)

CN3012

“a” <Note 3b>

WR3a <Note 3a>

Jog board assembly <Note 3c>

(L6c)

CN7001

(L6b)

CN7191

(L6a)

[6] Rec safety board assembly <Note 6a>

WR6b

WR6a

[6] Display board assembly

(S7a)

[7] Main board assembly

(S7b)

Note: When installing the Drum assembly, secure the screws (S4a to S4c) in the order of a, b, c.

Roller arm assy

Not used

Inertia plate

(L4a)

[4] Drum assembly

(P4)

(L4b)

(S4a)

Fig. D4

(S4c)

CN1

CON1

WR4a <Note 3a>

(S4b)

WR4b <Note 3a>

(L4a)

Cleaner assy

Fig. D6

WR5a

Q3003 End sensor <Note 5a>

(L5) Spacer <Note 5a>

(S5b) <Note 5a>

D3001

LED

A/C head base

Note: When installing the Mechanism assembly, secure the screws (S5a to S5b) in the order of a, b.

(S5c)

WR5a <Note 3a> <Note 5a>

(S5a)

CN2001

(S5c)

[5] Mechanism assembly

(L5) Spacer <Note 5a>

Q3002 Start sensor <Note 5a>

Fig. D5 Fig. D7

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 dis-

assembly 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 “Proce- dures for lowering the Cassette holder assembly” of 1.3 Disassembly/assembly method.)

(3) Remove the combined Mechanism and Main board as-

semblies.

(4) Remove the Rec safety board and Display board assem-

blies.

(5) Connect the wires and connectors of the major parts that

have been removed in step (1) and (4). (Refer to Fig.14-1a.)

(6) Place the combined Mechanism assembly, Main board

assembly and other board assemblies.

(7) 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.

Demod board assembly

Audio erase board assembly

CN902

CN7191

Display board assembly

2D Digital board assemblyS-Sub board assembly

TP4001

VR1201

CTL.P

D/A LEVEL

TP2253

ADJ

A.FM

C3025 TIMER CLOCK

Rec safety board assembly

TPGND

TP111 D.FF

TP106 PB.FM

CP5301

Terminal board assembly

Main board assembly

CP4001

CP5302

CN3011

CN7001

TP7001 (TEST)

Fig. 1-4-1a

1-4

1.4.2 Precautions for cassette loading in the “Service position”

The Rec safety board assembly detects cassette loading as well as cassette tabs. Therefore, after the assembly has been removed in the “Service position”, it is required to set the switch manually on the Rec safety board assembly when a cassette is loaded.

1.4.3 Cassette loading and ejection methods in the “Service position”

(1) Insert a cassette halfway in the Cassette holder assem-

bly.

(2) Set the switch on the Rec safety board assembly to on

(by pressing the switch).

(3) As soon as the cassette starts to be loaded, set the

switch on the Rec safety board assembly to off (by releasing the switch).

(4) Now the desired operation (recording, playback, fast for-

ward, rewind, etc.) is possible in this status.

(5) The switch on the Rec safety board assembly does not

have to be operated when ejecting a tape. But be sure to turn the set to the normal position before ejecting the tape.

Note:

In the “Service position”, the cassette tabs cannot be de-

•

tected and recording becomes possible even with a cassette with broken tabs such as the alignment tape. Be very careful not to erase important tapes.

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 Cas-

sette holder assembly pulled toward the front, slide the

holder in the same direction as the cassette insertion di-

rection. (For the positions of lock levers (A) (B), refer to

the “Procedures for lowering the Cassette holder assem-

bly” 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 serv-

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 si-

multaneously. Alternatively, transmit the code “80” from the Jig RCU.

icing.

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.

1-5

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

FDP (7segment LED) display model [FDP display]

0: 00

E: **

1: **

2: *1

3: *2

4: 34

5: *5

6: *6

7: *7

OSD display model [OSD display]

Normal display

EMG content display (E:Latest:Previous)

EMG detail information <1>

EMG detail information <2>

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)]

EMG E: **:** *1 : *2 : 34

*5: *6 : *7

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.

CUSTOM CODE 43: A CODE 53: B CODE

DATA CODE

INITIAL MODE

Fig. 1-8a Jig RCU

1.8.1 Displaying the EMG information

(1) Transmit the code “59” from the Jig RCU.

The FDP shows the EMG content in the form of “E:**:**”.

<Example 1> E : 01 : 03

Previous EMG

Latest EMG

<Example 2> E : –– : ––

No EMG record

(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 re-

set the display.

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>”.

1-6

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)

1.8.3 EMG content description

Note:

EMG contents “E08/E09” are for the model with Dynamic Drum (DD).

FDP CONTENT CAUSE

E01: Loading EMG

E02:

Unloading EMG

E03: Take Up Reel

Pulse EMG

E04: Drum FG

EMG

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

E07: SW Power

Short-Circuit EMG

E08:

DD Initialized (Absolute Position Sensor) EMG

E09: DD FG EMG

E0A:Supply Reel

Pulse EMG

EC1 or EU1: Head clog warning

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.

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.

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.

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.

When the eject operation does not complete in 3 seconds after the start, [E:05] is identified, the pinch rollers 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.

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.

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.

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.

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 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.

The mechanism is locked in the middle of mode transition.

. The mechanism is locked at the loading end due to the encoder position

reading error during mode transition.

Power is not supplied to the loading MDA.

The mechanism is locked in the middle of mode transition.

The mechanism is locked at the unloading end due to the encoder position reading error during mode transition.

Power is not supplied to the loading MDA.

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; The idler gear is meshed with the take-up reel gear, but incapable of wind-

2) ing due to too large mechanical load (abnormal tension);

3) The take-up reel sensor does not output the FG pulse.

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 wind-

ing due to too large a mechanical load (abnormal tension);

3) The supply reel sensor does not output the FG pulse.

Power is not supplied to the reel sensors.

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; The tape is damaged or a foreign object (grease, etc.) adheres to the tape.

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.

The drum control voltage (DRUM CTL V) is not supplied to the MDA.

Power is not supplied to the drum MDA.

The cassette cannot be ejected due to a failure in the drive mechanism of the housing.

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.

The sensor/switch for detecting the end of ejection are not functioning normally.

The loading motor drive voltage is lower than specified or power is not supplied to the motor (MDA).

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.

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.).

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.

The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.

Power is not supplied to the capstan MDA.

The SW 5 V power supply circuit is shorted with GND.

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.

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.

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.

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 cas-

sette 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.

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.

The power to a reel sensor is not supplied.

Table 1-8-3a

1-7

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 : 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 mod

e position at the moment of EMG

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

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

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

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

x7-speed)

Deck operation mode

* 2 : Mechanism operation mode [Common table of MN* and M3*]

Display

MN* M3*

00 00 Command standby (Status without executing command) 02 02 POWER OFF by EMG occurrence 04 04 Moving to the adjacent position in the LOAD direction 06 06 Moving to the adjacent position in the UNLOAD direction 08 08 Cassette ejection being executed / Cassette housing ejection being

- 0A Mode transition to STOP with cassette ejection end 0A 0C Cassette insertion being executed 0C 0E Tape being loaded 0E 10 Tape being unloaded 10 12 Mode transition to STOP with pinch roller compression ON 12 14 Mode transition to STOP with pinch roller compression OFF 14 16

16 18

18 1A Mode transition to PLAY 1A 1C Mode transition to FWD SEARCH 1C 1E Mode transition to REC 1E 20 Mode transition to FWD STILL / SLOW 20 22 Mode transition to REV STILL / SLOW 22 24 Mode transition to REV SEARCH 24 26 Mode transition from FF / REW to STOP 26 28 Mode transition to FF 28 2A Mode transition to REW 2A 2C 4 sec. of REV as a result of END sensor going ON during loading 2C 2E 2E 30 Mechanism position being corrected due to overrun 80 80 Mechanism in initial position (Dummy command)

executed

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

Short FF / REV as a result of END sensor going ON during unloading

Mechanism operation mode

[Table of HD*]

Display

00 STOP with pinch roller pressure off 01 STOP with pinch roller pressure on 02 U/L STOP (or tape being loaded) 04 PLAY 05 PLAY (x1-speed playback using JOG) 0E REC 11 Cassette ejected 22 FF 26 FWD SEARCH (variable speed) including x2-speed 2E INSERT REC 43 REW 47 REV SEARCH 4C AUDIO DUB 6E INSERT REC (VIDEO + AUDIO) 84 FWD STILL/SLOW 85 REV STILL/SLOW 8F REC PAUSE AF INSERT REC PAUSE C7 REV SEARCH (x1-speed reverse playback using JOG) CD AUDIO DUB PAUSE EF INSERT REC (VIDEO + AUDIO) PAUSE F0 Mechanism being initialized F1 POWER OFF as a result of EMG F2 Cassette being inserted F3 Cassette being ejected F4 Transition from STOP with pinch roller pressure on to STOP with pinch

roller pressure off F5 Transition from STOP with pinch roller pressure on to PLAY F6 Transition from STOP with pinch roller pressure on to REC F7 Cassette type detection SEARCH before FF/REW is being executed F8 Tape being unloaded F9 Transition from STOP with pinch roller pressure off to STOP with pinch

roller pressure on FA Transition from STOP with pinch roller pressure off to FF/REW FB Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.) FC Transition from STOP with pinch roller pressure off to cassette type de-

tection SEARCH FD Short REV being executed after END sensor on during unloading FE Tension loosening being executed after tape loading (STOP with pinch

roller pressure on)

Mechanism operation mode

1-8

3– : Mechanism sensor information [Common table of MN*, HD* and M3*]

Display

MN* / HD* M3* REC safety Start End

S-VHS SW CASS SW SW sensor sensor

0- VHS Cassette insertion Tab broken ON ON 1- VHS Cassette insertion Tab broken ON OFF 2- VHS Cassette insertion Tab broken OFF ON 3- VHS Cassette insertion Tab broken OFF OFF 4- VHS Cassette insertion Tab present ON ON 5- VHS Cassette insertion Tab present ON OFF 6- VHS Cassette insertion Tab present OFF ON 7- VHS Cassette insertion Tab present OFF OFF 8- S-VHS Cassette ejection Tab broken ON ON

9- S-VHS Cassette ejection Tab broken ON OFF A- S-VHS Cassette ejection Tab broken OFF ON B- S-VHS Cassette ejection Tab broken OFF OFF C- S-VHS Cassette ejection Tab present ON ON D- S-VHS Cassette ejection Tab present ON OFF E- S-VHS Cassette ejection Tab present OFF ON F- S-VHS Cassette ejection Tab present OFF OFF

Mechanism sensor information

–4 : Mechanism mode position [Common table of MN*, HD* and M3*]

Display Mechanism mode position

MN* HD* M3*

-0 -7 - Initial value

-1 -0 - EJECT position

- - -0 EJECT position (Cassette housing drive mode)

-2 -7 - Housing operating

- - -1 Between EJECT and U / L STOP

-3 -1 -2 U / L STOP position

- - -3 Guide arm drive position

-4 -7 -4 Tape being loaded / unloaded (When the pole base is

-5 -2 -5 Tape being loaded / unloaded (When the pole base is

-6 -7 -6 Pole base compressed position

-7 -3 -F FF / REW position

-8 -7 -F Between FF / REW and STOP with pinch roller compres-

-9 -4 -F STOP with pinch roller compression OFF

-A -7 -E Between STOP with pinch roller compression OFF and

-B -5 - REV (REV STILL / SLOW) position

- - -D REV position

- - -C Between REV and REV STILL / SLOW

- - -B REV STILL / SLOW position

-C -7 - Between REV and FWD

- - -A Between REV STILL / SLOW and FWD STILL / SLOW

-D -6 - FWD (FWD STILL / SLOW) position

- - -9 FWD STILL / SLOW position

-E -7 - Between FWD and PLAY

- - -8 Between FWD STILL / SLOW and PLAY

-F -6 -7 PLAY position

located on the front side of the position just beside the drum)

located on the rear side of the position just beside the drum)

sion ON

REV

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 : *7

* 5 : Type of the cassette tape in use <1> * 6 : Winding position of the cassette tape in use * 7 : Type of th

e cassette tape in use

<2>

(Winding area)

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 Cassette tape type <1>

00 Cassette type not identified 16

Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified 82 Small reel, thick tape (T-120) identified/thin tape (T-140) identified 84 Large reel (T-0 to T-60) identified 92

Small reel, thick tape (T-130) identified/thin tape (T-160 to T-210) identified 93

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) not classified C3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified D3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified E1 C cassette, thick tape (TC-10 to TC-20) identified E2 Small reel, thick tape (T-0 to T-100) identified E9 C cassette, thin tape (TC-30 to TC-40) identified

C cassette, thick tape/thin tape (TC-10 to TC-40) not classified

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>

00 Cassette type not identified

07 Small reel, thick tape T-5 08 - 0E C cassette, thick tape TC-10 09 - 15 C cassette, thick tape TC-20P 0A - 0B Small reel, thick tape T-20 0A - 16 C cassette, thin tape TC-30 0A - 16 C cassette, thin tape TC-40 0D - 0F Small reel, thick tape T-40 11 - 14 Small reel, thick tape T-60 15 - 18 Small reel, thick tape T-80 / DF-160 17 - 1A Small reel, thick tape T-90 / DF-180 19 - 1D Small reel, thick tape T-100 1D - 21 Small reel, thick tape T-120 / DF-240 1E - 1F Small reel, thin tape T-140 1F - 23 Small reel, thick tape T-130 21 - 23 Small reel, thin tape T-160 21 - 23 Small reel, thin tape T-168 22 - 24 Small reel, thick tape DF-300 22 - 24 Small reel, thin tape T-180 / DF-360 22 - 24 Small reel, thin tape T-210 / DF-420 22 - 23 Large reel T-5 23 - 24 Large reel T-10 25 - 26 Large reel T-20 27 - 29 Large reel T-30 29 - 2B Large reel T-40 2D - 2F Large reel T-60

Note:

•

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

1-9

SECTION 2

Press

(C)

(A)

(B)

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. dur-

ing 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.)

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 dis-

assembly 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 com-

pletes 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”.

Pole base assembly

Fig. 2-1-3a

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 mecha-

nism 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 posi-

tion, 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.

Pole base assembly (take-up side)

2.1.4 Jigs and tools required for adjustment

Roller driver A/C head positioning tool

Back tension cassette gauge

Alignment tape

(SP, stairstep, PAL)

Alignment tape

(LP, stairstep, PAL)

Jig RCU

Torque gauge

Pole base assembly

(supply side)

Tension arm assembly

Fig. 2-1-3c

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

Guide pole guard

2-2

Pinch roller arm assembly

Press lever assembly

Fig. 2-1-3d

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”.

UV catcher2 (supply and take-up side)

Stator assembly

Full erase head

T26

Pole base assembly

T25

(supply side)

Tension arm

T24

assembly

Adjust pin

T23

Tension brake

T22

assembly

T5 T7

Drum assembly

Head base

A/C head

Loading motor

Guide pole guard

Pinch roller arm

assembly

Lid guide

T10

Press lever

T11

assembly

Guide arm

T12

assembly

Reel disk

T13

(take-up side)

Sub brake assembly

T14

(take-up side)

Belt

B22

(loading motor)

B21

Control cam

B20

B19

Cassette gear

B18

Worm gear

Brake lever

Rec safety lever

Reel disk

T20

(supply side)

Main brake assembly (supply side)

Idler lever

T17T19T21

Idler arm assembly

T16T18

Pole base assembly (take-up side)

Fig. 2-1-5a Mechanism assembly top side

Capstan motor

Capstan brake assembly

B3 B5

Belt (capstan)

Loading arm gear (take-up side)

Loading arm gear (supply side)

Main brake assembly

T15

(take-up side)

Plate

(supply side)

Control

bracket1

Control plate

Tension arm

bearing

Link lever

B17

Rotary encoder guide

B16

Rotary encoder

B15

B14

Direct gear

B13

Change lever assembly

B12

B10

Clutch unit

Take-up head

Fig. 2-1-5b Mechanism assembly bottom side

Take-up lever

B11

2-3

Guide rail Roller cam assembly

L2L1

Fig. 2-1-5c Mechanism assembly left side

Opener guide

Door

opener

Drive gear

Cassette housing bracket

Limit gear

Loading motor

Worm gear

Belt (loading motor)

Fig. 2-1-5d Mechanism assembly right side

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 com-

pletely 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.

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

Lower drum assembly

Pinch roller arm assembly

Full erase head

Tension arm assembly

Tape transport

Capstan motor (Shaft)

Guide arm assembly

Capstan motor

Capstan brake assembly

Main brake assembly

Belt (Capstan)

Belt (Loading motor)

Loading motor

Clutch unit

Worm gear

Control plate

Brush

Tension brake assembly

Other Drive

Rotary encoder

: Cleaning

: Inspection or replacement if necessary

Operation Hours

~1000H ~2000H

¤R R ¤R ¤R

¤¤R ¤¤ ¤¤ ¤¤ ¤¤ ¤¤

R R R

R R R R R

¤R ¤R

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

R4 R1 R3 T9 T12 T11 B15 B12 B14 B13 B17 B21 B7 B8 B5 B4 B11 T14 T15 T13 T22 T24 T18 B19

Symbols and numbers

Removal parts

(Reference items) Replacement parts

Symbols and numbers

2.2.3 Guide rail T 1

2.2.3 Roller cam assembly T 1

2.2.3 Cassette housing bracket T 1

2.2.3 Opener guide T 2

2.2.3 Door opener T 3

2.2.3 Relay gear T 3

2.2.3 Limit gear T 3

2.2.3 Cassette holder assembly T 6

2.2.3 Drive gear T 4

2.2.3 Drive arm T 8

2.2.4 Pinch roller arm assembly T 1

T12

2.2.5 Guide arm assembly T 1

T11

2.2.5 Press lever assembly T 3

2.2.6 A/C head T 1

2.2.7 Loading motor T 1

2.2.8 Capstan motor T/B 1

2.2.9 UV catcher2 T 1

T17

Pole base assembly (take-up side)

2.2.9

T25

2.2.9

Pole base assembly (supply side)

B15

2.2.10 Rotary encoder B 1

B12

2.2.11 Clutch unit B 1

B14

2.2.12 Change lever assembly B 3

B13

2.2.12 Direct gear B 4

2.2.12 Coupling gear B 5

2.2.12 Clutch gear B 6

B17

2.2.13 Link lever B 1

2.2.14 Cassette gear B 2

B18

B20

2.2.14 Control cam B 2

B21

2.2.14 Worm gear B 1

T10

- Lid guide T/B 5

2.2.15 Control bracket1 B 1

2.2.15 Control plate B 6

2.2.16 Loading arm gear (supply side) B 7

Loading arm gear (take-up side)

2.2.16

2.2.16 Loading arm gear shaft B 9

2.2.17 Take-up lever T/B 7

B11

B10

2.2.17 Take-up head T/B 8

2.2.17 Control plate guide T/B 8

2.2.18 Capstan brake assembly T/B 7

T14

Sub brake assembly(take-up side)

2.2.19

T15

Main brake assembly(take-up side)

2.2.20

T19

2.2.20

Main brake assembly(supply side)

T13

2.2.20 Reel disk (take-up side) T/B 16

T22

2.2.21 Tension brake assembly T/B 9

T20

2.2.21 Reel disk (supply side) T/B 10

T24

2.2.21 Tension arm assembly T/B 10

2.2.21 Tension arm bearing T/B 10

T18

2.2.22 Idler lever T/B 17

T16

2.2.22 Idler arm assembly T/B 18

B19

- Brake lever (

B16

- Rotary encoder guide T/B 19

) T/B 18

L1L1L2

Number of removal steps

Guide rail

Roller cam assembly

Cassette housing bracket

Opener guide

Front (T)/Back (B) of mechanism

1 2 3 4 5

T/B 2

T/B 15

1 2 3 4

T/B 16

1 2 3 4 5 6 7 8

T/B 9

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

Relay gear

112 12

12 3

4 5

5 6

6 7

Cassette holder assembly

Drive gear

Table 2-1-5b

Note:

• The parts with marked ( nisms (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.

) have different types of mecha-

Drive arm

Pinch roller arm assembly

Guide arm assembly

Press lever assembly

UV catcher2

Rotary encoder

1 12

12 1 2 3 4 5

3 4

1 2 3 4

1 2 3 4 5

1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6

1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6

9 10 11 12 13 14

9 10 11 12 13 14 15

9 10 11 12 13 14 15 16

9 10 11 12 13 14 15 16 17 9 10 11 12 13 14 15 16 17

9 10 11 12 13 14 15 16 17 18

Clutch unit

Change lever assembly

Direct gear

Coupling gear

Link lever

Worm gear

Control bracket1

Control plate

Loading arm gear (supply side)

Loading arm gear (take-up side)

Take-up lever

Sub brake assembly (take-up side)

Main brake assembly (take-up side)

Reel disk (take-up side)

Tension brake assembly

Tension arm assembly

7 7

) 1

(

Idler lever

Brake 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.

2.2.3 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

Lugs

Roller cam assembly

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.)

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.)

Worm gear

Chassis hole

Guide hole

Control cam

Limit gear

Spring(A)

Opener guide

Relay gear

Door opener

Cassette housing bracket

Slit washers

Fig. 2-2-3b

(4) While swinging the lock levers (R) and (L) of the cassette

holder assembly toward the front, slide the cassette holder assembly until its legs come to where the guide rail and the roller cam assembly have been removed (so that the drive arm is upright). (See Fig.2-2-3c.)

Lock lever (L)

Cassette holder assembly

Drive arm

(Upright)

2-6

Mark E

Control plate

Fig. 2-2-2a

Fig. 2-2-3c

Legs

While holding the left side of the cassette holder, lift the

Cassette holder assembly

Drive arm

Lock lever (R)

(A)

(C)

(B)

Cassette holder assembly

(5)

cassette holder assembly so that the three legs on the left side are all released. Then pull the legs (A) and (B) on the right side out of the rail and also pull up the leg(C). (See Fig.2-2-3d and Fig.2-2-3e.)

(6) Draw out the drive gear, and remove the drive arm.

Cassette holder assembly

Fig. 2-2-3d

Cassette holder assembly

(A)

2. How to install (Phase matching)

(1) Insert the section (A) of the drive arm into the section (B)

of the main deck.

(2) Insert the section (1) of the drive gear into the round hole,

and the section (2) into the square hole on the drive arm. (See Fig.2-2-3f.)

(3) Hold the drive arm upright and fit the leg (C) on the right

side of the cassette holder assembly into the groove. (See Fig.2-2-3g.)

(4) While swinging the lock lever (R) of the cassette holder

assembly toward the front, put the legs (A) and (B) into the rail. (See Fig.2-2-3g.)

(5) Drop the three legs on the left side of the cassette holder

assembly into the groove at one time. (See Fig.2-2-3h.)

(6) Slide the whole cassette holder assembly toward the front

to bring it to the eject end position.

(7) Install the limit gear so that the notch on the outer cir-

cumference of the limit gear is brought into alignment with the guide hole on the main deck. (See Fig.2-2-3i.)

(8) Install so that the notch on the periphery of the relay gear

is aligned with the notch of the main deck and that hole A of the relay gear is aligned with the hole A of the limit gear and that hole B of the relay gear is aligned with the hole B of the drive gear. (See Fig.2-2-3i.)

(9) Install the door opener, opener guide, spring(A) and cas-

sette housing bracket and fasten the two slit washers.

Fig. 2-2-3e

Main deck right side

Drive arm

Hole

(C)

(B)

Drive arm

Fig. 2-2-3g

Hole

Drive gear

(1)

(2)

(A)

(B)

Fig. 2-2-3h

Fig. 2-2-3f

2-7

Relay gear

Guide holeNotches Notch

2.2.6 A/C head

1. How to remove

(1) Remove the two screws (A) and remove the A/C head

together with the head base.

(2) When replacing only the A/C head, remove the three

screws (B) while controlling the compression spring.

Head base

Drive gear Limit gear

Fig. 2-2-3i

2.2.4 Pinch roller arm assembly

1. How to remove

(1) Remove the spring from the hook of the press lever as-

sembly.

(2) Remove the slit washer and remove the pinch roller seat

2. (See Fig.2-2-4a.)

(3) Remove the pinch roller arm assembly by pulling it up.

Slit washer

Pinch roller seat2

Spring

Pinch roller arm

Press lever assembly

Pinch roller arm assembly

assembly

Fig. 2-2-4a

2.2.5 Guide arm assembly and press lever assembly

1. How to remove

(1) Remove the spring and expand the lug of the lid guide in

the arrow-indicated direction. Then remove the guide arm assembly by pulling it up.

(2) Remove the press lever assembly by pulling it up. (See

Fig.2-2-5a.)

Screws(A)

A/C head

Fig. 2-2-6a

Screws(B)

A/C head

Compression

A/C head board assembly

Head base

springs

Fig. 2-2-6b

2. How to install

(1) To make the post-installation adjustment easier, set the

temporary level as indicated in Fig.2-2-6c. Also make sure that the screw center (centre) is brought into alignment with the center (centre) position of the slot.

A/C head

12.4 mm

Head base

Screw

2-8

Tension spring

LugLid guide

Fig. 2-2-5a

Press lever assembly

Guide arm assembly

Head base

A/C head

Fig. 2-2-6c

2.2.7 Loading motor

1. How to remove

(1) Remove the belt wound around the worm gear. (2) Open the two lugs of the motor guide and remove the

loading motor, loading motor board assembly and motor guide altogether by pulling them up.

(3) When replacing the loading motor board assembly, take

care with the orientation of the loading motor. (Install so that the loading motor label faces upward.)

(4) When the motor pulley has been replaced, choose the

fitting dimension as indicated in Fig.2-2-7a.

Loading motor board assembly

Loading motor

Lugs

Motor guide

6.5 ± 0.2 mm

LABEL

Motor pulley

Worm gear

Belt

Fig. 2-2-7a

2.2.8 Capstan motor

1. How to remove

(1) Remove the belt (capstan) on the mechanism assembly

back side.

(2) Remove the three screws (A) and remove the capstan

motor.

Screws(A)

Screw(A)

Capstan motor

Belt

Fig. 2-2-8a

Spacer

2. How to install (Centering the mounting position)

When the capstan motor has once been removed and then reinstalled out of the initial correct position in the rotational direction, the capstan motor current may be unstable during operation in high or low temperatures. This may result in greater Wow & Flutter and occasionally in power breakdown because of current over - load. Install the capstan motor while following the procedure given below. (The capstan motor is centrally located when the unit is shipped from the factory.)

(1) Provisionally tighten the three screws (A) securing the

capstan motor.

(2) Install the mechanism assembly to which the capstan

motor is provisionally fastened on the bottom chassis which incorporates the Main board assembly. (No need to tighten the screws for mounting the mechanism.) Make sure that all the connectors for the mechanism assembly and the Main board assembly are correctly installed as indicated in Fig. 2-2-8b.

(3) Making sure that the connector for the capstan motor is

correctly mounted, and securely tighten the three screws (A).

Note:

• When the capstan motor has been replaced with a new one, perform recording in the EP(or LP) mode for at least 2 minutes at normal temperatures immediately before starting the FF/REW or SEARCH operations (Aging).

2.2.9 Pole base assembly (supply or take-up side)

1. How to remove

(1) Remove the UV catcher 2 on the removal side by loos-

ening the screw (A).

(2) Remove the pole base assembly on the supply side from

the mechanism assembly by loosening the screw (B) on the mechanism assembly back side and sliding the pole base assembly toward the UV catcher 2.

(3) As for the pole base assembly on the take-up side, turn

the pulley of the loading motor to lower the cassette holder because the screw (B) is hidden under the control plate. (See the “Procedures for Lowering the Cassette holder assembly” of 1.3 DISASSEMBLY/ASSEMBLY METHOD.) Further turn the motor pulley to move the cassette holder until the screw (B) is no longer under the control plate (in the half-loading position). Then remove it as done for the supply side by removing the screw (B).

Note:

• After reinstalling the Pole base assembly and the UV catcher2, be sure to perform compatibility adjustment.

Fig. 2-2-8b

Connector for the capstan motor

Screw(A)

UV catcher2

Screw(A)

UV catcher2

Screw(B)

Fig. 2-2-9a

2-9

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