JVC HR-J785EK, HR-J780EU, HR-J680EU, HR-J680EK Service Manual

SERVICE MANUAL

VIDEO CASSETTE RECORDER

TV

TV/VCR AUDIO – –:– –

1		2	3
			2
4		5	6
VPS/PDC	DAILY/QTDN. WEEKLY/HEBDO
7		8	9
0000		AUX	4
		0
START	STOP	DATE	PR
DEBUT	FIN

EXPRESS

1 PROG ? 30 SEC

T

V

MENU TV

– TV

ENTER/ENTREE
3	OK
PR +
	+
	T
PR –

	24H EXPRESS
SAT	VCR
	SAT
	REVIEW
	1 3	PR /
	2	PUSH / TURN

PAL

SPECIFICATIONS (The specifications shown pertain specifically to the model HR-J785EK)

g e n e r a l		t u n e r / t i m e r
Power requirement	: AC 220 V – 240 V Ó, 50 Hz/60 Hz	TV channel storage capacity: 99 positions (+AUX position)
Power consumption	: on : 16 W, off : 4.0 W	Tuning system	: Frequency synthesized tuner
Operating Temperature	: 5°C to 40°C	Channel coverage	: VHF 44.5 MHz – 143 MHz/
Storage Temperature	: –20°C to 60°C		143 MHz – 470 MHz/
Operating position	: Horizontal only		UHF 470 MHz – 862 MHz
Dimensions (WxHxD)	: 400 mm x 94 mm x 278 mm	Aerial output	: UHF channels 22 – 69 (Adjustable)
Weight	: 3.4 kg	Memory backup time	: Approx. 10 min.
Format	: VHS PAL standard
Maximum recording time		a c c e s s o r i e s
(SP)	: 240 min. with E-240 video cassette	Provided accessories	: RF cable, Satellite Controller,
(LP)	: 480 min. with E-240 video cassette		Infrared remote control unit,
			‘AA’ battery x 2
v i d e o / a u d i o
Signal system	: PAL-type colour signal and CCIR monochrome signal,
	625 lines/50 fields
Recording system	: DA4 (Double Azimuth) helical scan system
Signal-to-noise ratio	: 45 dB	Specifications shown are for SP mode unless otherwise specified.
Horizontal resolution	: 250 lines	E.& O.E. Design and specifications subject to change without notice.
Frequency range	: 70 Hz to 10,000 Hz (Normal audio)
	20 Hz to 20,000 Hz (Hi-Fi audio)
Input/Output	: 21-pin SCART connectors (IN/OUT x 1, IN/DECODER x 1)
	RCA connectors (AUDIO OUT x 1)

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

No. 82847

January 2001

TABLE OF CONTENTS

Section			Title	Page
Important Safety Precautions
INSTRUCTIONS
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
1.4.1		How to set the “Service position” .....................................		1-4
1.5	Mechanism service mode .....................................................			1-4
1.5.1		How to set the “Mechanism service mode” .....................		1-4
1.6 Jig RCU mode .......................................................................				1-4
1.6.1		Setting the Jig RCU mode ...............................................		1-4
1.6.2		Setting the User RCU mode ............................................		1-4
1.7	Emergency display function .................................................			1-5
1.7.1		Displaying the EMG information ......................................		1-5
1.7.2		Clearing the EMG history ................................................		1-5
1.7.3		EMG content description .................................................		1-6
1.7.4		EMG detail information <1> .............................................		1-7
1.7.5		EMG detail information <2> .............................................		1-8
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

Section			Title	Page
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
3.	ELECTRICAL ADJUSTMENT
3.1	Precaution ............................................................................			3-1
3.1.1		Required test equipments ...............................................		3-1
3.1.2		Required adjustment tools ...............................................		3-1
3.1.3		Color (colour) bar signal, color (colour) bar pattern .........		3-1
3.1.4		Switch settings and standard precautions .......................		3-1
3.2	Servo circuit ..........................................................................			3-2
3.2.1		Switching point ................................................................		3-2
3.2.2		Slow tracking preset ........................................................		3-2
3.3	Video circuit ..........................................................................			3-2
3.3.1		Auto picture initial setting ................................................		3-2
3.4	Syscon circuit [HR-J680EU/J780EU] ...................................			3-2
3.4.1		Timer clock ......................................................................		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) 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

4.7MAIN(FRONT) AND ADV.JOG SCHEMATIC DIAGRAMS . 4-15

4.8MAIN(TERMINAL), SAT CTL AND R.PAUSE SCHEMATIC

	DIAGRAMS ........................................................................	4-17
4.9 REMOTE CONTROLLER SCHEMATIC DIAGRAM ...........		4-19
4.10	MAIN, SAT CTL AND R.PAUSE CIRCUIT BOARDS .......	4-21
4.11	FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-23
4.12	WAVEFORMS ..................................................................	4-24
4.13	VOLTAGE CHARTS .........................................................	4-25
4.14	CPU PIN FUNCTION .......................................................	4-26
4.15	SYSTEM CONTROL BLOCK DIAGRAM .........................	4-27
4.16	VIDEO BLOCK DIAGRAM ...............................................	4-29
4.17	AUDIO BLOCK DIAGRAM ..............................................	4-31
5. PARTS LIST
5.1	PACKING AND ACCESSORY ASSEMBLY <M1> ...............	5-1
5.2	FINAL ASSEMBLY <M2> ....................................................	5-2
5.3	MECHANISM ASSEMBLY <M4> ........................................	5-4
5.4	ELECTRICAL PARTS LIST ..................................................	5-6
MAIN BOARD ASSEMBLY <03> ...............................................		5-6
A/C HEAD BOARD ASSEMBLY <12> .....................................		5-13
ADV.JOG BOARD ASSEMBLY(HR-J780EU/J785EK) <38> ...		5-13
LOADING MOTOR BOARD ASSEMBLY <55> .......................		5-13
R.PAUSE BOARD ASSEMBLY(HR-J780EU)<91> .................		5-13
SAT_CTL BOARD ASSEMBLY <92> ......................................		5-13

The following table lists the differing points between Models ( HR-J680EK, HR-J680EU, HR-J780EU and HR-J785EK) in this series.

	HR-J680EK	HR-J680EU	HR-J780EU	HR-J785EK
JOG/SHUTTLE	NOT USED	NOT USED	USED	USED
VIDEO SYSTEM	PAL	PAL/MESECAM(MANUAL)	PAL/MESECAM(MANUAL)	PAL
BROADCASTING STANDARD	I	B/G,D/K	B/G,D/K	I
STEREO DECODER	NICAM	NICAM/A2	NICAM/A2	NICAM
RF OUT SYSTEM [INITIAL]	I	G,K	G,K	I
VCR PLUS+	VIDEOPLUS+ DELUXE	SHOWVIEW DELUXE	SHOWVIEW DELUXE	VIDEOPLUS+ DELUXE
LANGUAGE [INITIAL] (ON SCREEN DISPLAY)	ENG	13LANG.[ENG]	13LANG.[ENG]	ENG
AUDIO DUBBING/OPERATION	NOT USED	NOT USED	USED/BUTTON	NOT USED
FRONT VIDEO/AUDIO IN	NOT USED	NOT USED	USED	NOT USED
WINDOW COLOR	SMOKE LIGHT GRAY	SMOKE LIGHT GRAY	BLUE	SMOKE LIGHT GRAY
REMOTE PAUSE	NOT USED	NOT USED	USED	NOT USED
CABLE MOUSE	PROVIDED	OPTION	OPTION	PROVIDED

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.

•Precautions during Servicing
1. Locations requiring special caution are denoted by labels and in-			12. Crimp type wire connector
scriptions on the cabinet, chassis and certain parts of the product.			In such cases as when replacing the power transformer in sets
When performing service, be sure to read and comply with these			where the connections between the power cord and power trans-
and other cautionary notices appearing in the operation and serv-			former primary lead wires are performed using crimp type connec-
ice manuals.			tors, if replacing the connectors is unavoidable, in order to prevent
			safety hazards, perform carefully and precisely according to the
2. Parts identified by the ! symbol and shaded (
		) parts are	following steps.
critical for safety.			1) Connector part number : E03830-001
Replace only with specified part numbers.
Note: Parts in this category also include those specified to com-			2) Required tool : Connector crimping tool of the proper type which
ply with X-ray emission standards for products using			will not damage insulated parts.
cathode ray tubes and those specified for compliance			3) Replacement procedure
with various regulations regarding spurious radiation			(1) Remove the old connector by cutting the wires at a point
emission.			close to the connector.
			Important : Do not reuse a connector (discard it).

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 cut close to connector

3) High voltage leads

							Fig.3
	5.	Use specified insulating materials for hazardous live parts. Note					(2) Strip about 15 mm of the insulation from the ends of the
		especially:
		1)	Insulation Tape	3)	Spacers	5) Barrier	wires. If the wires are stranded, twist the strands to avoid
		2)	PVC tubing	4)	Insulation sheets for transistors		frayed conductors.
							15 mm
	6.	When replacing AC primary side components (transformers, power
		cords, noise blocking capacitors, etc.) wrap ends of wires securely
		about the terminals before soldering.

			Fig.4
		(3) Align the lengths of the wires to be connected. Insert the
		wires fully into the connector.
	Fig.1		Metal sleeve
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			Connector
	parts.		Fig.5
9. When a power cord has been replaced, check that 10-15 kg of		(4) As shown in Fig.6, use the crimping tool to crimp the metal
	force in any direction will not loosen it.
		sleeve at the center position. Be sure to crimp fully to the
		complete closure of the tool.
	Power cord
			25	Crimping tool
			1.
		2.
		5.	0
		5
	Fig.2		Fig.6
10.	Also check areas surrounding repaired locations.	(5) Check the four points noted in Fig.7.
11.	Products using cathode ray tubes (CRTs)	Not easily pulled free	Crimped at approx. center
				of metal sleeve
	In regard to such products, the cathode ray tubes themselves, the
	high voltage circuits, and related circuits are specified for compli-
	ance with recognized codes pertaining to X-ray emission.
	Consequently, when servicing these products, replace the cath-			Conductors extended
	ode ray tubes and other parts with only the specified parts. Under	Wire insulation recessed
	no circumstances attempt to modify these circuits.
		more than 4 mm
	Unauthorized modification can increase the high voltage value and
			Fig.7
	cause X-ray emission from the cathode ray tube.

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
Externally	Z	A	c
exposed	V
accessible part
	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]Top cover, Bracket

[2]Front panel assembly

[3]Drum assembly

[4]Mechanism assembly

[5]Main board assembly

[6]Bottom cover

1.2How to read the disassembly and assembly

<Example>

	Step/		Part Name		Fig.		Point		Note
	LocNo.				No.
	[1]		Top cover,		D1		4(S1a),(S1b),3(L1a),		<Note 1a>
							2(SD1a),(P1a),(W1a),
							CN1(WR1a),
			Bracket				2(S1c)
	(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

1.3 Disassembly/assembly method

	Step/	Part Name	Fig.	Point	Note
	LocNo.		No.
	[1]	Top cover,	D1	4(S1a), (S1b)
		Bracket		- - - - - - - - - - - - - - - - -
				2(S1c)
	[2]	Front panel assembly	D2	CN7001(WR2a)	<Note 2a>
				[HR-J780EU/J785EK],	<Note 2b>
				4(L2a), 3(L2b)	<Note 2c>
		ADV. Jog board assembly		- - - - - - - - - - - - - - - - -
				2(S2a)
	[3]	Drum assembly	D3	CON1(WR3a),	<Note 2c>
				CN1(WR3b),
				(S3a), (S3b), (S3c)
		(Drum shield)		- - - - - - - - - - - - - - - - -
				2(S3d)
	[4]	Mechanism assembly	D4	CN2001(WR4a),	<Note 2c>
				(S4a),(S4b),	<Note 4a>
				(S4c), (S4d)
	[5]	Main board assembly	D5	6(L5a),	<Note 2c>
				(S5a), 3(S5b), (S5c)
	[6]	Bottom cover	D6	2(L6a), 9(L6b)	<Note 6a>

<Note 2a>

•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.

<Note 2b>

•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.

<Note 2c>

•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.

<Note 4a>

•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 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.

<Note 6a>

When removing the bottom cover, push down the two tabs (L6a) to slide the bottom cover.

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.

(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)	(S1b)
	[1] Top cover
(S1c)	(S1a)
	(S1a)
	(S1c)
	[1]
	Bracket

Fig. D1

1-2

	[2] Front panel assembly
	(L2a)
		CN7001
	(L2b)	b <Note 2b>
		a <Note 2a>
		(L2a)
	WR2a	WR2a
	<Note 2c>	<Note 2c>
	CN7004
	(S2a)
	ADV. Jog board assembly
	[HR-J780EU/J785EK]

Fig. D2

Note:

When installing the Drum assembly, secure the screws (S3a to S3c) in the order of a, b, c.

Drum shield

(S3d)

Inertia plate
(S3a)	(S3c) WR3a
	<Note 2c>
(L3a)	CON1
(P3)
	(S3b)	WR3b
		<Note 2c>
(L3b)
Roller arm		Cleaner assy
assy
Not used
[3]		(L3c)
Drum
asembly		Not used
	CN1

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.
				WR4a
		(S4c)		<Note 2c>
				(S4a)	(S4d)
	(S4b)		<Note 4a>
	<Note 4a>

	[4]	(L6a)
	Mechanism
		<Note 6a>
	assembly

Q3002

End sensor (L6b) <Note 4a>

CN2001

(L4)				[6]
				Bottom cover
Spacer			(L6b)
	D3001	(L4)		(L6b)
<Note 4a>		Spacer
	LED
		<Note 4a>
	<Note 4a>
			Fig.	D6

Fig. D4

	(S5b)
(S5a)
	(S5c)
	[5]
	Main board
(L5a)	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.

TP106	TP4001
PB. FM	CTL. P

TP2253

A.PB.FM

TP111

D.FF

CP4001

Main board

assembly

CP5302

C3025

Timer Clock

[HR-J680EU/J780EU]

TP7001

TEST

TPGND

Fig. 1-4-1a

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.

1.6Jig 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-
	icing.

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.

1-4

1.7 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	Normal display
					EMG content display
	E: * * : * *
					(E:Latest:Previous)
*1:		*2		: 34	EMG detail information <1>
					EMG detail information <2>
*5:		*6		: *7

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

0: 00 Normal display

E: ** EMG content display (Latest)

1:** EMG content display (Previous)

2:*1 EMG detail information <1> [Deck operation mode]

3:*2 EMG detail information <1> [Mechanism operation mode]

4:34 EMG detail information <1>

[Mechanism sensor information and Mechanism mode position] 5: *5 EMG detail information <2>

[Type of the cassette tape in use <1>] 6: *6 EMG detail information <2>

[Winding position of the cassette tape in use] 7: *7 EMG detail information <2>

[Type of the cassette tape in use <2> (Winding area)]

OSD display model [OSD display]

EMG						EMG content display
						(E:Latest:Previous)
E : * *		: * *				EMG detail information <1>
*1:	*2	: 34
*5:	*6	: *7				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							INITIAL MODE
43: A	CODE
53: B	CODE
DATA CODE

Fig. 1-7a Jig RCU [PTU94023B]

1.7.1Displaying 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 reset 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 “1.7.3 EMG content description”.

•For the EMG detail information <1> , see “1.7.4 EMG detail information <1> ”.

•For the EMG detail information <2> , see “1.7.5 EMG detail information <2>”.

1.7.2Clearing 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

1.7.3EMG content description

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

FDP	CONTENT		CAUSE
E01: Loading EMG	When the mechanism mode cannot be changed to an-	1.	The mechanism is locked in the middle of mode transition.
	other mode even when the loading motor has rotated	2. The mechanism is locked at the loading end due to the encoder position
	for more than 4 seconds in the loading direction, [E:01]		reading error during mode transition.
	is identified and the power is turned off.	3.	Power is not supplied to the loading MDA.
E02: Unloading EMG	When the mechanism mode cannot be changed to an-	1.	The mechanism is locked in the middle of mode transition.
	other mode even when the loading motor has rotated	2.	The mechanism is locked at the unloading end due to the encoder posi-
	for more than 4 seconds in the unloading direction, [E:02]		tion reading error during mode transition.
	is identified and the power is turned off.	3.	Power is not supplied to the loading MDA.
E03: Take Up Reel	When the take-up reel pulse has not been generated for	1.	The take-up reel pulse is not generated in the FWD transport modes (PLAY/
Pulse EMG	more than 4 seconds in the capstan rotating mode, [E:03]		FWD SEARCH/FF, etc.) because;
	is identified, the pinch rollers are turned off and stopped,		1) The idler gear is not meshed with the take-up reel gear;
	and the power is turned off. However, the reel EMG is		2) The idler gear is meshed with the take-up reel gear, but incapable of wind-
	not detected in STILL/SLOW modes.		ing 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 wind-
			ing 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.
E04: Drum FG	When the drum FG pulse has not been input for more	1.	The drum could not start or the drum rotation has stopped due to too large
EMG	than 3 seconds in the drum rotating mode, [E:04] is iden-		a load on the tape, because;
	tified, the pinch rollers are turned off and stopped, and		1) The tape tension is abnormally high;
	the power is turned off.	2.	2) 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.
		3.	The drum control voltage (DRUM CTL V) is not supplied to the MDA.
		4.	Power is not supplied to the drum MDA.
E05: Cassette Eject	When the eject operation does not complete in 3 sec-	1.	The cassette cannot be ejected due to a failure in the drive mechanism of
EMG	onds after the start, [E:05] is identified, the pinch rollers		the housing.
	are turned off and stopped, and the power is turned off.	2. When the housing load increases during ejection, the loading motor is
	When the cassette insertion operation does not complete		stopped because of lack of headroom in its drive torque.
	in 3 seconds after the start, the cassette is ejected. In		Housing load increasing factors: Temperature environment (low tempera-
	addition, when the operation does not complete within		ture, etc.), mechanism wear or failure.
	3 seconds after the start, [E:05] is also identified and the	3.	The sensor/switch for detecting the end of ejection are not functioning normally.
	power is turned off immediately.	4.	The loading motor drive voltage is lower than specified or power is not sup-
			plied 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.
E06: Capstan FG	When the capstan FG pulse has not been generated for	1.	The capstan could not start or the capstan rotation has stopped due to too
EMG	more than 1 second in the capstan rotating mode, [E:06]		large a load on the tape, because;
	is identified, the pinch rollers are turned off and stopped,		1) The tape tension is abnormally high (mechanical lock);
	and the power is turned off.However, the capstan EMG		2) The tape is damaged or a foreign object (grease, etc.) is adhered to the
	is not detected in STILL/SLOW/FF/REW modes.	2.	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.
		3.	The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.
		4.	Power is not supplied to the capstan MDA.
E07: SW Power	When short-circuiting of the SW power supply with GND	1.	The SW 5 V power supply circuit is shorted with GND.
Short-Circuit	has lasted for 0.5 second or more, [E:07] is identified,	2.	The SW 12 V power supply circuit is shorted with GND.
EMG	all the motors are stopped and the power is turned off.
E08: DD Initialized	When DD tilting does not complete in 4 seconds, [E:08]	1.	The absolute value sensor is defective. (The soldered parts have separated.)
(Absolute	is identified, the tilt motor is stopped and the power is	2.	The pull-up resistor at the absolute sensor output is defective. (The soldered parts
Position	turned off.		have separated.)
Sensor)		3.	Contact failure or soldering failure of the pins of the connector (board-to-board) to the
EMG		4.	absolute value sensor.
			The absolute value sensor data is not sent to the System Controller CPU.
	When the DD FG pulse is not generated within 2.5 sec-	1. The FG sensor is defective. (The soldered parts have separated.)
E09: DD FG EMG	onds, [E:09] is identified, the tilt motor is stopped and	2.	The pull-up resistor at the FG sensor output is defective. (The soldered parts have
	the power is turned off.	3.	separated.)
			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.
E0A:Supply Reel	When the supply reel pulse has not been generated for	1.	The supply reel pulse is not generated in the FWD transport mode (PLAY/
Pulse EMG	more than 10 seconds in the capstan rotating mode,		FWD SEARCH/FF, etc.) because;
	[E:0A] is identified and the cassette is ejected (but the		1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-
	power is not turned off). However, note that the reel EMG		sette is cut in the middle;
	is not detected in the SLOW/STILL mode.		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.
EC1 or EU1:	Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output
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.

Table 1-7-3a

1-6

1.7.4EMG 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 mode 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			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

2022 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)

8484 FWD STILL / SLOW

8585 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

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

Display			Mechanism operation mode
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

0808 Cassette ejection being executed / Cassette housing ejection being executed

-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

1416 Mode transition to STOP with pinch roller compression OFF as a result of POWER OFF

1618 Mode transition to STOP with pinch roller compression ON as a result of POWER ON

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		Short FF / REV as a result of END sensor going ON during unloading
2E	30		Mechanism position being corrected due to overrun
80	80		Mechanism in initial position (Dummy command)

[Table of HD*]

Display		Mechanism operation mode
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)

84FWD STILL/SLOW

85REV 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)

1-7

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

	Display		Mechanism sensor information
		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

–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
				located on the front side of the position just beside the
				drum)
-5	-2		-5	Tape being loaded / unloaded (When the pole base is
				located on the rear side of the position just beside the
				drum)
-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-
				sion ON
-9	-4		-F	STOP with pinch roller compression OFF
-A	-7		-E	Between STOP with pinch roller compression OFF and
				REV
-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

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.

1.7.5EMG 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 the 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

92Small reel, thick tape (T-130) identified/thin tape (T-160 to T-210) identified

93Small 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

F1 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.

1-8

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.)

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 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”.

Loading motor

Pole base assembly

Fig. 2-1-3a

(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.

Pole base assembly (take-up side)

Pole base assembly (supply side)

Tension arm assembly

2.1.4 Jigs and tools required for adjustment

Roller driver	A/C head positioning tool	Torque gauge
PTU94002	PTU94010	PUJ48075-2
Back tension cassette gauge	Jig RCU
PUJ48076-2	PTU94023B
Alignment tape	Alignment tape
(SP, stairstep, PAL)	(LP, stairstep, PAL)
MHPE	MHPE-L

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

T2 Stator assembly

T26 Full erase head

T25 Pole base assembly (supply side)

T24 Tension arm assembly

T23 Adjust pin

T22 Tension brake assembly

UV catcher2 (supply and take-up side)				T6 A/C head
T3	Drum assembly	T5	Head base	T7 Loading motor

	T20	Reel disk	T18 Idler lever		T16 Idler arm assembly
		(supply side)
T21 Rec safety lever	T19 Main brake assembly			T17	Pole base assembly (take-up side)
		(supply side)

T8 Guide pole guard

T9 Pinch roller arm assembly

T10 Lid guide

T11 Press lever assembly

T12 Guide arm assembly

T13 Reel disk (take-up side)

T14 Sub brake assembly (take-up side)

T15 Main brake assembly (take-up side)

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

B1 Capstan motor

B3 Capstan brake assembly

B5 Loading arm gear (supply side)

B2 Belt (capstan)

B4 Loading arm gear (take-up side)

B22 Belt

(loading motor)

B21 Worm gear

B20 Control cam

B19 Brake lever

B18 Cassette gear

B17 Link lever

B15 Rotary encoder		B13 Direct gear	B10 Take-up head
B16 Rotary encoder guide	B14	Change lever assembly	B12 Clutch unit

B6 Plate

(supply side)

B7 Control

bracket1

B8 Control plate

B9 Tension arm bearing

B11 Take-up lever

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

2-3

L1 Guide rail

L2 Roller cam assembly

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

	R1 Opener guide
R2 Door
opener
R3 Drive gear	R5 Limit gear	Loading motor
R4 Cassette housing bracket		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 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.

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		Operation Hours
				~1000H	~2000H
		Upper drum assembly		¤R	R
transport		A/C head		¤R	¤R
		Lower drum assembly		¤	¤R
		Pinch roller arm assembly		¤	¤
Tape		Full erase head		¤	¤
		Tension arm assembly		¤	¤
		Capstan motor (Shaft)		¤	¤
		Guide arm assembly		¤	¤
		Capstan motor			R
		Capstan brake assembly			R
		Main brake assembly			R
Drive		Belt (Capstan)		R	R
		Belt (Loading motor)			R
		Loading motor			R
		Clutch unit			R
		Worm gear			R
		Control plate			R
Other		Brush		¤R	¤R
		Tension brake assembly		R	R
		Rotary encoder			R
¤ : Cleaning
R : 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

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

	Symbols and numbers	mechanismof(B)(T)/Back
	Removal parts
(Reference items)		Front
Replacement parts
2.2.3	Guide rail	T
2.2.3	Roller cam assembly	T
2.2.3	Cassette housing bracket	T
2.2.3	Opener guide	T
2.2.3	Door opener	T
2.2.3	Relay gear	T
2.2.3	Limit gear	T
2.2.3	Cassette holder assembly	T
2.2.3	Drive gear	T
2.2.3	Drive arm	T
2.2.4 Pinch roller arm assembly		T
2.2.5	Guide arm assembly	T
2.2.5	Press lever assembly	T
2.2.6	A/C head	T
2.2.7	Loading motor	T
2.2.8	Capstan motor	T/B
2.2.9	UV catcher2	T
2.2.9	Pole base assembly (take-up side)	T/B
2.2.9 Pole base assembly (supply side)		T/B
2.2.10 Rotary encoder		B
2.2.11 Clutch unit		B
2.2.12 Change lever assembly		B
2.2.12 Direct gear		B
2.2.12 Coupling gear		B
2.2.12 Clutch gear		B
2.2.13 Link lever		B
2.2.14 Cassette gear		B
2.2.14 Control cam		B
2.2.14 Worm gear		B
-	Lid guide	T/B
2.2.15Control bracket1		B
2.2.15Control plate		B
2.2.16Loading arm gear (supply side)		B
2.2.16Loading arm gear (take-up side)		B
2.2.16Loading arm gear shaft		B
2.2.17Take-up lever		T/B
2.2.17Take-up head		T/B
2.2.17Control plate guide		T/B
2.2.18Capstan brake assembly		T/B

2.2.19Sub brake assembly(take-up side) T/B 2.2.20Main brake assembly(take-up side) T/B 2.2.20Main brake assembly(supply side) T/B

2.2.20Reel disk (take-up side)		T/B
2.2.21Tension brake assembly		T/B
2.2.21Reel disk (supply side)		T/B
2.2.21Tension arm assembly		T/B
2.2.21Tension arm bearing		T/B
2.2.22Idler lever		T/B
2.2.22Idler arm assembly		T/B
-	Brake lever (*1)	T/B
-	Rotary encoder guide	T/B

Numberof removal steps	L1	L2	R4	R1		Cassetteholder assembly	R3		T9	T12	T11	T1	B15	B12	B14	B13				B17	B21	B7	B8	B5	B4	B11	T14	T15	T13	T22	T24	T18	B19
	railGuide	camRollerassembly	Cassettehousing bracket	Openerguide	gearRelay		gearDrive	armDrive	rollerPincharm assembly	armGuideassembly	leverPressassembly	catcher2UV	encoderRotary	unitClutch	Changelever assembly	gearDirect	Couplinggear			leverLink	gearWorm	Controlbracket1	Controlplate	Loadingarm gear (supply side)	Loadingarm gear (take-up side)	up-Takelever	brakeSubassembly (take-up side)	brakeMainassembly (take-up side)	diskReel(take-up side)	Tensionbrake assembly	Tensionarm assembly	leverIdler	leverBrake(
																																	) 1
																																	*
1
1
1
2			1
3			1	2
3			1	2
3			1	2
6	1	2	3	4	5
4			1	2	3
8	1	2	3	4	5	6	7
1
1
3									1	2
1
1
1
1
2												1
2												1
1
1
3													1	2
4													1	2	3
5													1	2	3	4
6													1	2	3	4	5
1
2																				1
2																				1
1
5									1	2	3										4
1
6													1	2	3					4		5
7													1	2	3					4		5	6
8													1	2	3					4		5	6	7
9													1	2	3					4		5	6	7	8
7													1	2	3					4		5	6
8													1	2	3					4		5	6			7
8													1	2	3					4		5	6			7
7													1	2	3					4		5	6
15	1	2	3	4	5	6	7	8					9	10	11					12		13	14
16	1	2	3	4	5	6	7	8					9	10	11					12		13	14				15
9	1	2	3	4	5	6	7	8
16	1	2	3	4	5	6	7	8					9	10	11					12		13	14				15
9	1	2	3	4	5	6	7	8
10	1	2	3	4	5	6	7	8																						9
10	1	2	3	4	5	6	7	8																						9
10	1	2	3	4	5	6	7	8																						9
17	1	2	3	4	5	6	7	8					9	10	11					12		13	14							15	16
18	1	2	3	4	5	6	7	8					9	10	11					12		13	14							15	16	17
18	1	2	3	4	5	6	7	8					9	10	11					12		13	14				15	16	17
19	1	2	3	4	5	6	7	8					9	10	11					12		13	14				15	16	17				18

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.

2-5

2.2 Replacement of major parts

2.2.1Before 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.)

Chassis hole

Worm gear

Guide hole

Control cam

Mark E

Control plate

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
Lugs	Roller cam	Lug
	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.)

	Limit gear
	Spring(A)
	Opener guide
Relay gear
Door opener	Slit washers
	Cassette housing bracket
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)	Drive arm
	(Upright)

Cassette holder assembly

Leg

Legs

Fig. 2-2-3c

2-6

(5)While holding the left side of the cassette holder, lift the 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)

(C) (B)

Fig. 2-2-3e

Drive arm

Main deck right side

Hole

Hole

Drive gear

(1)

(2)

Drive arm

(A)

(B)

Fig. 2-2-3f

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 circumference 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 cassette housing bracket and fasten the two slit washers.

Cassette holder assembly

Lock lever (R)

(A)

Drive arm	(C) (B)

Fig. 2-2-3g

Cassette holder assembly

Fig. 2-2-3h

2-7