JVC HR-S3902US, HR-S3912UC, HR-S3912US, HR-S5902US, HR-S5912UC Service Manual

SERVICE MANUAL

VIDEO CASSETTE RECORDER

HR-S3902US, HR-S3912US, HR-S3912UC, HR-S5902US, HR-S5912US, HR-S5912UC

REW

FF

24HR QUICK REC LINK PROGRAM

POWER	INSERT	A.DUB
S-VIDEO

For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY). Regarding SCHEMATIC DIAGRAMS, refer to the service manual No. 82946 (HR-S2902US).

SPECIFICATIONS (The specifications shown pertain specifically to the model HR-S5902US.)

GENERAL

Power requirement	:	AC 120 Vd, 60 Hz
Power consumption
Power on	:	16 W
Power off	:	1.5 W
Temperature
Operating	: 5 °C to 40 °C (41 °F to 104 °F)
Storage	: –20 °C to 60 °C (–4 °F to140 °F)
Operating position	:	Horizontal only
Dimensions (WxHxD)	: 435 mmx94 mmx242 mm
		(17-3/16" x 3-3/4" x 9-3/4")
Weight	: 2.7 kg (5.9 lbs)
Format	: S-VHS/VHS NTSC standard
Maximum recording time
SP	: 210 min. with ST-210 video cassette
EP	:	630 min. with ST-210 video cassette
VIDEO/AUDIO
Signal system	: NTSC-type color signal and EIA
		monochrome signal, 525 lines/
		60 fields
Recording/Playback	: DA-4 (Double Azimuth) head helical
system		scan system
Signal-to-noise ratio	:	45 dB
Horizontal resolution
VHS	:	230 lines
S-VHS	:	400 lines
Frequency range
Normal audio	: 70 Hz to 10,000 Hz
Hi-Fi audio	: 20 Hz to 20,000 Hz
Input/Output	: RCA connectors (INx2, OUTx1)
		S-video connectors (INx2, OUTx1)

TUNER

Tuning system	: Frequency-synthesized tuner
Channel coverage
VHF	: Channels 2–13
UHF	: Channels 14–69
CATV	: 113 Channels
RF output	: Channel 3 or 4 (switchable; preset to
	Channel 3 when shipped) 75ohms,
	unbalanced

TIMER

Clock reference	:	Quartz
Program capacity	:	1-year programmable timer/
		8 programs
Memory backup for timer is not supported.

ACCESSORIES

Provided accessories	: Infrared remote control unit,
	“AA” battery x 2,
	S-video cable (4-pin),
	RF cable (F-type)

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

HR-S3902US, HR-S3912US, HR-S3912UC, HR-S5902US, HR-S5912US, HR-S5912UC V16S1,S15

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD

No.82950

2003/03

TABLE OF CONTENTS

Section		Title	Page
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1	Manually removing the cassette tape ........................................		1-1
1.2	Removing the major parts	..........................................................	1-2
1.2.1 How to read the procedure ..........................................table			1-2
1.2.2 Disassembly procedure .......................................................			1-2
1.3	Emergency display function .......................................................		1-4
1.3.1 Displaying the EMG information ..........................................			1-4
1.3.2 Clearing the EMG history .....................................................			1-4
1.3.3 Details of the OSD display ..................in the EMG display mode			1-5
1.3.4 EMG content description ......................................................			1-6
1.3.5 EMG detail information<1> ..................................................			1-7
1.3.6 EMG detail information<2> ..................................................			1-8
1.3.7 EMG detail information<3> ..................................................			1-8
1.4	Service position ..........................................................................		1-9
1.4.1 How to set the "Service .........................................position"			1-9
1.5	Jig RCU mode ............................................................................		1-9
1.5.1 Setting the Jig RCU mode ...................................................			1-9
1.5.2 Setting the User RCU ................................................mode			1-9
1.6	Mechanism service mode ..........................................................		1-9
1.6.1 How to set the "Mechanism ..........................service mode"			1-9
1.6.2 How to exit from the "Mechanism .................service mode"			1-9
1.7	Maintenance and inspection ....................................................		1-10
1.7.1 Cleaning .............................................................................			1-10
1.7.2 Lubrication .........................................................................			1-10
1.7.3 Suggested servicing schedule .................for main components			1-10

2. MECHANISM

Refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY)

3. ADJUSTMENT
3.1 Before adjustment ......................................................................	3-1
3.1.1 Precaution .............................................................................	3-1
3.1.2 Required test equipments ....................................................	3-1
3.1.3 Required adjustment tools ...................................................	3-1
3.1.4 Color(colour) bar signal, color(colour) bar pattern ...............	3-1
3.1.5 Switch settings .....................................................................	3-1
3.1.6 Manual tracking mode (Auto tracking ON/OFF) setting .................	3-1
3.1.7 EVR sdjustment .............................................................................	3-2
3.2 Mechanism compatibility adjustment .........................................	3-2
3.2.1 Tension pole position ............................................................	3-3
3.2.2 FM waveform linearity ..........................................................	3-3
3.2.3 Height and tilt of the A/C head .............................................	3-3
3.2.4 A/C head phase(X-value) .....................................................	3-4
3.3 Electrical Adjustment ..................................................................	3-4
3.3.1 Servo circuit .........................................................................	3-4
3.3.1.1 Switching point ................................................................	3-4
3.3.1.2 Slow tracking preset ........................................................	3-5
3.3.2 Video circuit ..........................................................................	3-5
3.3.2.1 EE Y/PB Y(S-VHS/VHS)level ..........................................	3-5

Section	Title	Page
4. CHARTS AND DIAGRAMS
Refer to the SERVICE MANUAL No.82946(HR-S2902US)
5. PARTS LIST
5.1 EXPLODED VIEW ......................................................................		5-1
5.1.1 PACKING AND ACCESSORY ASSEMBLY<M1> ................		5-1
5.1.2 FINAL ASSEMBLY<M2> ......................................................		5-2
5.1.3 MECHANISM ASSEMBLY<M4> ..........................................		5-3
5.2 PARTS LIST ................................................................................		5-4
PACKING AND ACCESSORY ASSEMBLY<M1> ...........................		5-4
FINAL ASSEMBLY<M2> .................................................................		5-4
MECHANISM ASSEMBLY<M4> .....................................................		5-4
MAIN BOARD ASSEMBLY<03> ....................................................		5-5
A/C HEAD BOARD ASSEMBLY<12> ..........................................		5-12
ADV.JOG/SW BOARD ASSEMBLY<38> ......................................		5-12
LOADING MOTOR BOARD ASSEMBLY<55> .............................		5-12
R.PAUSE BOARD ASSEMBLY<99> .............................................		5-12

The following table indicates main different points between models HR-S3902US, HR-S3912US, HR-S3912UC, HR-S5902US, HRS5912US and HR-S5912UC.

	MODEL	HR-S3902US	HR-S3912US	HR-S3912UC	HR-S5902US	HR-S5912US	HR-S5912UC
	ITEM
	BODY COLOR	MOLD-BLACK	PAINT-PURE SILVER	PAINT-PURE SILVER	PAINT-BLACK	PAINT-PURE SILVER	PAINT-PURE SILVER
	RCU ILLUMI FUNCTION	NOT USED	NOT USED	NOT USED	USED(GLOW)	USED(GLOW)	USED(GLOW)
	FLYING ERASE HEAD	NOT USED	NOT USED	NOT USED	USED	USED	USED
	ZERO FRAME EDIT	NOT USED	NOT USED	NOT USED	USED	USED	USED
	INSERT	NOT USED	NOT USED	NOT USED	USED	USED	USED
	AUDIO DUBBING	NOT USED	NOT USED	NOT USED	USED	USED	USED

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.

v Precautions during Servicing

1.Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and certain parts of the product. When performing service, be sure to read and comply with these and other cautionary notices appearing in the operation and service manuals.

2.Parts identified by the symbol and shaded () parts are critical for safety.

Replace only with specified part numbers.

Note: Parts in this category also include those specified to comply with X-ray emission standards for products using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission.

3.Fuse replacement caution notice.

Caution for continued protection against fire hazard. Replace only with same type and rated fuse(s) as specified.

4.Use specified internal wiring. Note especially:

1)Wires covered with PVC tubing

2)Double insulated wires

3)High voltage leads

5.Use specified insulating materials for hazardous live parts.

Note especially:

1)	Insulation Tape	3)	Spacers	5) Barrier
2)	PVC tubing	4)	Insulation sheets for transistors

6.When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering.

Fig.1

7.Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.)

8.Check that replaced wires do not contact sharp edged or pointed parts.

9.When a power cord has been replaced, check that 10-15 kg of force in any direction will not loosen it.

Power cord

Fig.2

10.Also check areas surrounding repaired locations.

11.Products using cathode ray tubes (CRTs)

In regard to such products, the cathode ray tubes themselves, the high voltage circuits, and related circuits are specified for compliance with recognized codes pertaining to X-ray emission. Consequently, when servicing these products, replace the cathode ray tubes and other parts with only the specified parts. Under no circumstances attempt to modify these circuits.

Unauthorized modification can increase the high voltage value and cause X-ray emission from the cathode ray tube.

12.Crimp type wire connector

In such cases as when replacing the power transformer in sets where the connections between the power cord and power transformer primary lead wires are performed using crimp type connectors, if replacing the connectors is unavoidable, in order to prevent safety hazards, perform carefully and precisely according to the following steps.

1)Connector part number : E03830-001

2)Required tool : Connector crimping tool of the proper type which will not damage insulated parts.

3)Replacement procedure

(1)Remove the old connector by cutting the wires at a point close to the connector.

Important : Do not reuse a connector (discard it).

cut close to connector

Fig.3

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

15 mm

Fig.4

(3)Align the lengths of the wires to be connected. Insert the wires fully into the connector.

Metal sleeve

Connector

Fig.5

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

25	Crimping tool
1.
2.
0
5.
5

Fig.6

(5) Check the four points noted in Fig.7.

Not easily pulled free	Crimped at approx. center
		of metal sleeve
		Conductors extended
Wire insulation recessed
more than 4 mm
Fig.7

1

S40888-01

v 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.

Chassis

Fig. 8

d

d'

Power cord,

primary wire

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	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.

AC inlet	Grounding Specifications
	Exposed accessible part	Grounding Impedance (Z)
	Region
	USA & Canada	Z ≤ 0.1 ohm
Earth pin	Europe & Australia	Z ≤ 0.5 ohm

Milli ohm meter

Fig. 10

AC Line Voltage

Region

Insulation Resistance (R)

Dielectric Strength

Clearance Distance (d), (d')

100 V

Japan

R

£

1 MΩ/500 V DC

AC 1 kV 1 minute

d, d'

£

3 mm

100 to 240 V

AC 1.5 kV 1 miute

d, d'

£

4 mm

110 to 130 V

USA & Canada

1 MΩ

³

R

³

12 MΩ/500 V DC

AC 1 kV 1 minute

d, d'

£

3.2 mm

110 to 130 V

AC 3 kV 1 minute

d

£

4 mm

Europe & Australia

R

£ 10 MΩ/500 V DC

(Class 2)

d'

£

8 mm (Power cord)

200 to 240 V

AC 1.5 kV 1 minute

d'

£

6 mm (Primary wire)

(Class 1)

Table 1 Specifications for each region

AC Line Voltage

Region

Load Z

Leakage Current (i)

a, b, c

100 V

Japan

1 kΩ

i

≤

1 mA rms

Exposed accessible parts

110 to 130 V

USA & Canada

0.15 F

1.5 kΩ

i

≤

0.5 mA rms

Exposed accessible parts

i

≤

0.7 mA peak

Antenna earth terminals

110 to 130 V

Europe & Australia

2 kΩ

i

≤

2 mA dc

220 to 240 V

i

≤

0.7 mA peak

Other terminals

50 kΩ

i ≤

2 mA dc

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.

2	S40888-01

SECTION 1

DISASSEMBLY

1.1 Manually removing the cassette tape

If you cannot remove the cassette tape which is loaded because of any electrical or mechanical failures, manually remove it by taking the following steps.

(1)Unplug the power cord plug from the power outlet.

(2)Refer to the disassembly procedure of the VCR and perform the disassembly of the major parts before removing the mechanism assembly. (See Fig. 1-1a.)

Fig.	1-1a
Tension arm assembly
Pole base assembly	Pinch roller arm assembly
Spring(a)
	Direction of unloading
Fig.	1-1b

(3)Unload the pole base assembly by manually turning the gear of the loading motor until the pole base assembly is hidden behind the cassette lid. In doing so, hold the tape by the hand to keep the slack away from any grease. (See Fig. 1-1b.)

In case of mechanical failures, while keeping the tension arm assembly free from tension, pull out the tape on the pole base assembly. Take the spring(a) of the pinch roller arm assembly off the hook, and detach it from the tape.

(4)Remove the screw (a) of the side frame (L/R).

(5)Hold the slack tape and cassette cover together, lift the cassette tape, top frame, cassette holder and side frames (L, R) together from the rear and remove them by dis-engaging the hooks (a) and (b).

	Screw(a)	Cassette holder
	Cassette tape
	Top frame		Side frame(R)
			Screw(a)
	Hook(a)
	Side frame(L)		Hook(b)
	Fig.	1-1c

(6)Take up the slack of the tape into the cassette. This completes removal of the cassette tape.

1-1

1.2 Removing the major parts

1.2.1 How to read the procedure table

This table shows the steps for disassembly of the externally furnished parts and board assemblies. Reverse these steps when re-assembling them.

<Example>

	Step/		Part Name		Fig.		Point		Note
	LocNo.				No.
	[1]		Top cover,		1-3a		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

	1.2.2	Disassembly procedure
	Step/	Part Name	Fig.	Point	Note
	LocNo.		No.
	[1]	Top cover	1-2-2d	3(S1a), 2(L1a)
	[2]	Front panel assembly	1-2-2d	2(S2a), 2(L2a), 2(L2b),	<Note 2a>
			1-2-2a	3(L2c)	<Note 2b>
				CN7001(WR2a)
		(ADV.Jog board assembly)		--------------------------
				3(S2b),
				Knob assembly
	[3]	Mechanism assembly	1-2-2d	CN2001(WR3a),	<Note 2a>
				(S3a), (S3b)	<Note 3a>
		(Drum Shield)		--------------------------	<Note 3b>
				(S3f), (L3a)
		(Drum assembly)	1-2-2b	--------------------------	<Note 3c>
				CN1(WR3b),
			1-2-2c	(S3x), (S3y), (S3z)
	[4]	Main board assembly	1-2-2d	(L4a), (L4b), (L4c),
				(L4d)

<Note 2a>

•Be careful not to damage the connector and wire etc. during connection and disconnection.

•When connecting the flat wire to the connector, be careful with the flat wire direction.

<Note 2b>

•When reattaching the Front panel assembly, make sure that the door opener of the Side frame (R) is lowered in position prior to the reinstallation.

•When reattaching the Front panel assembly, pay careful attention to the switch lever of the Front panel assembly not to make it touch the switch knob of the Main board assembly from the side.

•When reattaching the Front panel assembly, lift the Cassette door slightly.

1-2

	Door
	opener
	Side	Switch
		lever
	frame(R)
		Switch
		knob
	<Note 3a>	Fig. 1-2-2a

•When reattaching the Mechanism assembly, secure the screws (S3a to S3b) in the order of a, b.

<Note 3b>

•When reattaching the Mechanism assembly, be sure to align the phase of the Rotary encoder on the Main board assembly.

•When reattaching the Mechanism assembly, set the “Mechanism assembling mode”. (See “section 2 mechanism”.)

•When reattaching the Mechanism assembly to the Main board assembly, take care not to damage the sensors and switch on the Main board assembly.

<Note 3c>

•When reattaching the Drum assembly, secure the screws (S3x to S3z) in the order of x, y, z.

	(S3y)	(S3x)	(S3z)
		(S3z)
			(S3y)
	Mechanism	Drum
	assembly		(S3x)HOOK
		assembly

<Note 3b>

<NOTE>

Attach the Drum assembly appropriately,

since the installation state of the Drum assembly influences the FM WAVEFORM LINEARITY greatly.

Fig. 1-2-2b

•When handling the drum assembly alone, hold it by the motor or shaft. Be careful not to touch other parts, especially the video heads. Also take care not to damage the connectors.

Shaft

Motor

Video heads

Fig. 1-2-2c