Sanyo VHR-310 Bedienungsanleitung

FILE NO.

SERVICE MANUAL

Video Cassette Recorder VH R-31 O(New Zealand)

VH R-31 OIR (Ireland)

VHR-31 OEE (PAL General)

VHR-31 OPS (Middle East)

piiiq PAL

CONTENTS

DISASSEMBLY .....................................2 Please see other materials with Reference

ELECTRICAL ADJUSTMENT .........................6 No. given in table below.

TEST POINT FOR TAPE PATH ADJUSTMENT . . . . . . . . . 14

PARTS LIST

ACCESSORIES ...................................15

PACKING MATERIALS .............................15

CABINET &CHASSIS PARTS . . . . . . . . . . . . . . . . . . . . ...15

MECHANISM PARTS ..............................16

ELECTRICAL PARTS .............................. 19

CIRCUIT DIAGRAMS (Refer totheseparate volume)

~‘RODucT‘AFETY‘OT’cE—

Ieference Nc

WM-530599

MS531029

The components designated by asymbol (~)in this schematic diagram designates components whose value are of special significance

to product safety. Should any component designated by asymbol need to be replaced, use only the part designated in the Parts List.

Do not deviate from the resistance, wattage and voltage ratings shown.

NOTE: 1. Parts order must contain ModeI Number, Part Number and Description.

2. Substitute parts may be supplied as the service parts.

3. N.S. P.: Not available as service parts.

TEIINZ,IR,C,ME 14314285,84,90,86 REFERENCE No. SM531298

M1-1420S(2)li3

1. DISASSEMBLY

1-1.

REMOVAL OF CABINET, MECHANISM UNIT AND MAIN BOARD

REMOVING THE CABINET PARTS (Fig. 1.1.1) REMOVING THE CP-1 PWB ASSEMBLY (Fig. 1.1.3)

1. Remove the cabinet and bottom cover by removing the

four screws (A) and five screws (B). After removing the cabinet parts and mechanism unit:

2. Remove the front panel by removing the locks of the 1. Pull outtheTM-1 PWBAss’yfrom CN301 and CN302 while

clamps (C) using ascrewdriver, etc. and slightly rotating pressing and spreading out the four clamps (H) as shown

the bottom part in the direction of the arrow. by the arrows.

Note: Electrical adjustments for the this model can be per- 2. Remove the two red screws (J). Next, remove the CP-I

formed with only the cabinet removed. PWB Ass’y by Iif%ng it straight up while pressing and

spreading out the two clamps (K) as shown by the

REMOVING THE MECHANISM MAIN UNIT (Fig. 1.1.2) arrows.

After removing the cabinet parts

1. Remove the two screws (D), and then remove the bracket.

2. Remove the 29-wire flat cable from the MC-2 PWB, and

then remove the 8-wire flat cable from the VP-1 PWB

Ass’y.

3. Remove the mechanism main unit by removing the two

screws (E) and two screws (F).

Remove, as well, the two screws (G) at the cassette tray

side while pressing the tray lock lever as shown in the

enlarged view and pushing the cassette tray to the posi-

tion where the two screw (G) appear.

M-TEIUE-1

Front

(A) Cabinet

‘Main Unit

Bottom Cover

(B)

(B) A*(B)

Fig. 1.1.1

–2–

‘, i.,~,

M1-14208(1)2/3

. —.

M-TEIUE-2 (D)

Tray lock Lever Cable

Fig. 1.1.2

M-TEII.IE-3

Mechanism Ma

Flat Cable

Cp-1 PWB ASS

Clamps (

TM-1 PWB ASS’

Fig. 1.1.3

–3–

M1-14208(2)3/3

TEMPORARILY SEITING UP AND CONNECTING MAIN PWB ASSEMBLY

The following is an example of how to place and connect the main PWB not requiring ajig, when repairing the -

CP-1 PWB assembly (Fig. 1.1.4)

1. Place the mechanism main unit at the fixed position on

the chassis.

2. Connect the 29-wire flat cable to the MC-2 PWB, and the

8-wire flat cable to the VP-1 PWB Ass’y respectively.

Connect the TM-1 PWB Ass’y to operate VCR by using

the remote control.

3. Place the CP-1 PWB Ass’y above the mechanism main

unit along the cassette holder. Insert the tip (L) of the

terminal board into the opening (M) at the side of the

chassis, as shown in the enlarge view.

M-TEIUE-4

Ass’y

VP-I

Mecha

MC-2 PWB

Fig. 1.1.4

–4–

L1-14277(N)1/1

1-2. MAIN CIRCUIT BOARD

L-TE1 L/E

_Vp-1 PWB /%S’y

Shield Case

(Power supply part)

MC-2 PWB

(On the Mechanism Unit)

Tuner/lF/RF Conv. Unit

TM-1 PWB

Fig. 1.2.1

–5–

S1-14277(N)112

2.ELECTRICALADJUSTMENT

2-1. SERVO CIRCUIT ADJUSTMENT

.These adjustments should be carried out upon completion of the tape transport adjustments.

.If the tape transport adjustments (except the tilt adjustment) are carried out after these adjustments, follow the procedures

again in Section 2-1-3. SWITCHING POSITION ADJ.

●When acassette tape is loaded, auto-tracking will be set immediately after starting the first playback. As this will deviate the

tracking center set, be sure to press the channel buttons (+) or (-) once directly after starting playback to prevent auto-tracking

from being set.

2-1-1. TEST EQUIPMENT AND STANDARDS REQUIRED

Oscilloscope Vertical sensitivity: 5mV/DIV, external trigger

Band width: more than 10 MHz

Test Tape VHJ-0009 or VHJ-0023: SP mode, monoscope, 6KHz

Blank Tape VHS-type cassette tape

Monitor TV

2-1-2. LOCATION OF ADJUSTMENT POINTS

P1B11500C-SV2

IC301

Iclol

●‘o uo0*

.,..

:....>

1#&

...,.’

.,,

IC602

VR351

SW-P

,....,

:,.8.;

VR201

BIAS :

......

%: ;

,....1

:-..,-:

:...: IC20”

Icl11

VR104

IC351

TP202 ●

TP201 ●

;-:

IC302 i~

VRI02 ‘Ev ,.:

TP102~E;’””Sr6?

IC161 a

.............

..: TP103 :...........0

:....: ..-., .....’’..... Tuner/lF/RF Conv. ~

v;;;;: vR\#zR~i OUT Unit ......

CAR PB-Y ~

CP-1 PWB (FOIL SIDE) Fig.2.1.1

–6–

PlsosSooC-sl ,,

Shield Case

EHcIl

TP181

REC current

TP183 SW-P- /LVR182 REC YIC

TP182 ENV-

VP-1 PWB ASS’Y Fig. 2.1.2

NOTE

●Self-recording means “Record any broadcasting or video

signal and play back the just-recorded portion”.

2-1-3. SWITCHING POSITION ADJ.

“b

‘L

IMeasuring Point IMeasuringEquipment

TPIOI Oscilloscope

(VIDEO OUT)

TP183 (SW-P)

ADJ. Location AD

ADJ. Condition

PLAY mode

Test tape

(VHJ-0009 or

VHJ-0023)

.Value

2-1-4. STILL V-LOCK ADJ.

Measuring Point Measuring Equipment ADJ. Condition

Picture of Color bar generator Self-recording

monitor TV or STILL mode

Broadcasting Blank tape

Monitor

ADJ. Location IADJ. Value

CHANNEL (+) button The minimum vertical shake

CHANNEL (-) button

VR351 (SW-P) 6.5 H*0.5 H1. Play back the just-recorded portion and then set the VCR

in the STILL mode.

1. Set the tracking control position to the center by pressing 2. Press the CHANNEL(+) button orthe CHANNEL(-) button

CHANNEL buttons (+) and (-) simultaneously. so that any vertical shake of the picture is brought to its

(Tracking center position display in the indicator minimum.

panel “T -:- “)

2. Adiust VR351 (SW-P) so that the width “T”becomes 6.5 H

Y0.5 Hss shown in Fig. 2.1.3.

WS-SWP

T= 6.5 H*0.5 H

4h~,,,” “

Front edge of

Ivertical s~nc signal

-1\f

Rise RF. SW. PULSE

Fig. 2.1.3

-7–

V1-14207(1)114

2-2. VIDEO CIRCUIT ADJUSTMENT

.Before making the following adjustments, Section 2-1. SERVO CIRCUIT ADJUSTMENT should be completed

.Use the relay jig to provide simple adjustment of the VP-1 PWB Ass’y.

2-2-1. TEST EQUIPMENT AND STANDARDS REQUIRED

Color Bar Signal Generator PAL Color bar signel with 100% white level (EBU color barsignel)

(Signal waveform is described below. Refer to Fig. 2.2.1)

Oscilloscope Vertical sensitivity: 5mV/DIV, external trigger

Band width: more than 10 MHz

Digital Voltmeter DC range

Test Tape VHJ-0008 or VHJ-0023: SP mode, color bar, 1kHz

(Color bar signal waveform kdescribed below. Refer to Fig. 2.2.3)

Blank Tape VHS-type cassette tape

Oscilloscope Probe Input capacity: less than 25 PF (10:1)

less than 40 pF (1:1)

Covering frequency: DC -40 MHz (10:1)

DC-30 MHZ(1:1)

Frequency Counter 8significant digits

Adjustment Relay Jig VHJ-0065: 5-wire flat cable for VP-1 PWB Ass’y

PAL TV TEST SIGNAL

WPVSC

bite Peak Level

Pedestal Level

SynC Tip Level

IEc:gnA

COLOR BAR SIGNAL WAVEFORM Fig. 2.2.1

COLOR BAR PATTERN ON MONITOR TV

Fig. 2.2.2

WPV-TCS

‘H.Sync Signal

COLOR BAR SIGNAL WAVEFORM (VHJ-0008)

Fig.2.2.3

WPV-TCP

g:~&g

(75%) >OU=K6

vu 100”A

White Black

COLOR BAR PAITERN (VHJ-0008) ON MONITOR TV

Fig.2.2.4

–8-

VI-14277(N)2J4

2-2-2. LOCATION OF ADJUSTMENT POINTS

PI acmoocVI

Shield case

‘Iv”

-- 0

.——

TP181

REC Current

TP183 SW-P VR182 REC-YIC

TP182 ENV

VP-1 PVVB ASS’Y Fig.2.2.5

PIB1 lSOOCVi/2

CP-1 PWB (FOIL SIDE) Fig.2.2.6

IC351

IC301

IC20’

Iclol :...q

,...!

Icl11

‘cl u●

...

,..”...

.. c) &

.......

1IC602 o

VR351

SW-P

,....,

:,0.;

VR201

BIAS

m[.;: c

IC302 ~~

;;

ov:m:2 ~vo

jcj-6~--, a

~pl 02 ~;o:{jn[ef&OTP103 ‘------”---”’

.’ J#WIF/RF Conv.

~R~3.’-v~01f3~f#?’ OUT

CAR PB-Y ~

-TP202 ●

TP201 ●

...

.....

....

–9–

v114285(N) 3/4

2-2-3. ADJUSTMENT RELAY JIG

Connect the Flat cable end from the Cylinder Ass’y to the

VP-1 PWB Ass’y using the Relay jig to provide simple

repairing and adjustment of the VP-1 PWB Ass’y, as shown in

Fig.2.2.7. Further, when adjusting theVP-l PWBAss’y, be sure

to make contact an end of Shield case with Bracket of the

VP-1 PWB Ass’y to maintain the shield effect. If the VP-1

PWB Ass’y does not contact, there is insufficient ground and

no proper play back image can be obtained.

WPV-TP4/lR BAss’y

\- Uu

Fig. 2.2.7

.Self-recording means “Record the video signal and play

back the just-recorded portion”.

●Connect the monitor TVto the VIDEO OUTPUT terminal,

before making following adjustments.

2-2-4. AGC LEVEL ADJ.

Measuring Point MeasuringEquipment ADJ. Condtiion

TPI02 Color bar generator E-E mode

Oscilloscope

(101 probe)

ADJ. Location ADJ. Value

VRI02 (AGC) 0.5Vp-p *0.025Vp-p

1. Connect the color bar generator to the VIDEO INPUT

terminal.

2. AdjustVR102(AGC)for 0,5VP-P* 0.025Vp-p asshown in

Fig. 2.2.8.

WPV-AGC 100% White

0.5 Vp-p *0.025 Vp-p

119

Fig. 2.2.8

2-2-5. PB-Y LEVEL ADJ. -—

Measuring Point Measuring Equipment ADJ. Condition

TP1OI Oscilloscope PIAY mode

Test tape

(VHJ4XX18 or

VHJ-0023)

ADJ. Location ADJ. Valw

VR1OI (PB-Y) 1Vpp *0.05 Vp-p

1. Play back atest tape.

2. Adjust VRIOI (PB-Y) for the video luminance si9nal level

of 1Vp-p f0.05 Vp-p. (Refer to Fig. 2.2.9)

wPv-PBY 100% White

1Vp-p k

~u” Iu u

1- ,,, -1 Fig. 2.2.9

Measuring Point MeasuringEquipment ADJ. Condition

TPI03 Color bar generator REC mode

Frequency counter

ADJ. Location AlXl. Value

VR103(CAR) 3.83 MHz &0.05 Mtiz

.—

1. Connect the color bar generator to the VIDEO INPUT ‘-

terminal.

2. Afier removing the first color bar signal input from the

video inputterminal, immediately adjust VR103 (CAR) so

that the frequency becomes 3.83MHz *0.05 MHz.

–lo–

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