Sanyo VHR-290 Series, VHR-28 Series, VHR-29 Series, VHR-291 Series, VHR-294 Series Service Manual

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Page 1

Service Manual

Video Cassette

Recorder

VHR-290 series VHR-291 series VHR-294 series VHR-28 series VHR-29 series

-d+

TABLE OF CONTENTS

1. CIRCUIT BOARD LOCATIONS

1-1. MAINBOARDS .......... . . . .... . . . ..... . . ..... . . . .... . . . .... . . . ..... . . . .... . . . . .... 1

1-2. LOCATION FOR TAPE PATH ADJUSTMENT .... . . . .... . . . .... . . . ..... . . . .... . . 1

2. ELECTRICAL ADJUSTMENT

2-1. Preparation ... . . . .... . . . ..... . . .... . . . .... . . . ..... . . .... . . . .... . . . ..... . . . ..... .

2-2. SERVO CIRCUIT ADJUSTMENT . . . .. . . . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . . . .. . . . . . . . . 3

2-3.

VIDEOCIRCUIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2-4. AUDIOCIRCUIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2-5. LEVEL METER CIRCUIT ADJUSTMENT .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-6. MTSDECODER CIRCUIT ADJUSTMENT ... . . . . .. . . . . . .. . . . . .. . . . . . . . .. . . . . . . . 10

2-7. VIDEOTEH DECODER CIRCUIT ADJUSTMENT .. . . . . . .. . . . . . .. . . . . . . . .. . . . . 11

2-8. TUNER lFCIRCUIT ADJUSTMENT . .... . . . ..... . . ..... . . ..... . . ..... . . . . ..... . .

DISASSEMBLY PROCEDURES

3-1. REMOVAL OF REMOTE CONTROL UNITCASE . . . .... . . ..... . . . . .... . . . .... 13

FP4H, FP4HV series

REFERENCE No. WM-531054

-.—

Page 2

3513 L11(N)

1. CIRCUIT BOARD LOCATIONS 1-1.

MAIN BOARDS

TM-

L13L072

Video pre-amp unit= _

~ CP-1

(Video,Servo& Audio)board

rvv - I \ruwcu WWIYI waIu

/2714

m.! , in-...-. ,.. .. . ..l..iL-.-...4

(Display,Timer & Tuning control)board

mtiq:;;;:::r”

TN-5 (NICAM decoder) board

Installed specific equipment and models

TN-3 (MTS decoder) VHR-2901, 280ES, 294G, 281,291 and 290 (Australia). TN-5 (NICAM decoder): VHR-2901R, 290ES, 291 E, 29SP and 280 (New Zealand). TM-6 (Videotext decoder): VHR-294G and 29SP, TM-8 (VPS circuit)board: VHR-284G.

Appearance and specifications are subject to change without notice.

Fig.

1-1

1-2. LOCATION FOR TAPE PATH ADJUSTMENT

NOTE: Test point TP182 and TP183 for tapa path adjustment is shown in figure below.

For adjustment, refer to the separate volume “Mechanism Sewice Technical Information”.

FC6L019

Shield case

TP181

VR181

VR182

~l>n.RE~~ ~u.<rF~

TP291

TP183

TP182

AF REC

SW PULSE ENVELOPE

Fig. 1-2 Pre-amp unit

‘d”

—l—

Page 3

3513J11(N)

2. ELECTRICAL ADJUSTMENT

2-1.

PREPARATION

2-1-1. EQUIPMENT

●

✍

●

Colour TV monitor PAL Colour-bar generator (with RF and LINE OUTPUT) PAL TV test signal generator (Multi-burst signal with colour burst) Audio signal generator Oscilloscope (dual trace; frequency response: 10MHZ or more; probe: 10:1 ) Frequency counter (countable to 10MHZ or higher) Digital voltmeter AC voltmeter In/output probes

Alignment cassette (VHJ-0008) PAL Colour bar 1KHz Alignment cassette (VHJ-0009) Monoscope 6KHz Alignment cassette (VHJ-0023) PAL Monoscope 6KHz, PAL Colour-bar 1KHz, SECAM Colour-bar 1KHz, PAL RF Sweep MESECAM Colour-bar 1KHz, NTSC Colour-bar

1KHz. Alignment cassette (VHJ-0080) PAL colour bar HiFi BPF Alignment cassetee (VHJ-0020) AF level colour bar 1KHz

Relay jig (VHJ-0067) 12-wire cable for Pre-amp unit

Connect the Flat cable end from the Drum assembly to the

Pre-amp unit using the Relay jig to provide simple repair-

ing and adjustment of the Pre-amp unit, as shown in Fig, 2-1-1. Further, when adjusting the Pre-amp unit, be sure to make contact an end of Shield case with Bracket of the Pre-amo unit to maintain the shield effect. Relay jig (VHJ-0088) 22-wires cable for AD-2 board Connect the Flat cable end to CN251 of the CP-1 board and other end to CN271 of the AD-2 board using the Relay jig (Shown in Fig. 2-1 -2) to provide simple repairing and adjustment of the AD-2 board.

Relay jig < ~“ {

‘\

Flat cable

Slinder

assembly

PlaJo35

@-a

W ‘Erracket

Fig. 2-1-1

RMJol 4

Fig. 2-1-2

2-1-2. SET-UP Because the RF input signal is used for circuit adjustments,

o Check to be sure that there is no spike noise in the sync connect the colour-bar generator to the ANT IN terminal of the VCR. The RF input signal is processed by the tuner and IF circuit. It is important that the video output signal ofthe IF circuit satisfies the items shown in Fig. 2-1-3. Connect the oscilloscope to the VIDEO OUTPUT terminal of the video circuit and terminate with a 75Q load, and then check the video output signal.

s The amplitude of the sync signal should be approxi-

mately 0.3 VP-P,

“ The amplitude of the video signal should be approxi-

mately 0.7 Vp-p.

“ While observing the oscilloscope or TV screen, make

fine-tuning adjustments so that the colour burst amplitude is approximately 0.3 Vp-p.

part of the horizontal sync signal

100%

-P

H sync si&al

Fig. 2-1-3

—2—

Page 4

3513S11(N)

2-2. SERVO CIRCUIT ADJUSTMENT Q

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 Item 1 SWITCHING POSITION ADJ.

. When a cassette 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 tracking buttons (+) or (–) once directly after starting playback to prevent auto-tracking from being set. Press the tracking buttons (+) and (-) simultaneously, the tracking control to the center position.

o Unless otherwise specified, all test point and adjustment location on the CP-1 board.

10.

—

Item

SWITCHING

POSITION

SP SLOW

TRACKING

Input

Alignment

cassette

(VHJ-0009

VHJ%23)

Colour bar

from

Colour bar

generator

Mode

PLAY

SP mode

REC

PLAY

STILL

SLOW

Point

VIDEO

OUTPUT

TPIOI

RF SW

pulse

TP183

(Video pre-

amp unit)

TV screen

Location

VR351

TRACKING

buttons

and REC button Front panel]

Remark

W25SC01

~65Hfi

RF switching pulse

Vtdeo

signal

7654321 —

V sync

Press the tracking buttons (+) and (-) simultaneously to the tracking center position (indicator panel displayed: “T —:— “).

2. Adjust VR351 so that the phase of the leading edge ofthe vertical sync signal isdelayed

6.5 t 0.5 H from the rise of the RFswitching pulse waveform.

W20S011 Noise at — upper side

m ‘:”

w~~~de

Set the VCR in the SP REC mode and record at the middle of the cassette tape. Playback the recorded part, and set the SP STILL mode.

Press the tracking buttons (+) or (-) until V jitter (very fine movement of the vertical sync.) is minimized. Set the SP SLOW mode by remote control unit.

Press the tracking buttons (+) and (-) simultaneously to adjust the tracking to the center

position (displayed: “T —:— “).

Press the REC button during the tracking center display (approx. within three seconds), at this time make sure that display as

shown ‘T— : —“.

Press tracking buttons (+)or(-) to send away the noise which appears on the monitor from the screen, and also adjust the position

of the noise at the upper side ofthe screen to the similar position of the one at the lower

side judging from the center of the screen.

Press the REC button during the tracking

center display (approx. within three sec-

onds), at this time make sure that display as

shown “T— : —“.

-----

–3–

Page 5

3513S21(N)

io. Item Input

Mode

Point

Location

Remark

W20S011

Noise at —

. . ..-. . . . . . . . . .

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

Monitor

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

upper side screen

Noise at

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

----- ----- ..----

Iower side

----- ------ ..-.

Set the VCR in the LP REC mode and record at the middle of the cassette tape.

2. Playback the recorded part, and set the LP STILL mode.

3. Pressthe tracking buttons(+) or (-) until V jitter (very fine movement of the vertical sync.) is

LP mode

minimized.

REC

4. Set the LPSLOW mode byremote control unit.

Colour bar

TRACKING

5. Press the tracking buttons (+) and (-) simul-

LP SLOW

from PIAY

buttons

taneously to adjust the tracking to the center

3 TRACKING Colour bar

TV screen

and

position (displayed: ‘T —:— “).

generator ST:LL

REC button

Press the REC button during the trakcing

(Front panel) center display (approx. within three seconds),

SLiW

at this time make sure that display as shown “T- : –“.

6. Press tracking buttons (+) or (-) to send away the noise which appears on the monitor from the screen, and also adjust the position ofthe noise at the upper side of the screen to the similar position of the one at the lower side

judging from the center of the screen.

Press the REC button during the tracking

center display (approx. within three seconds), at this time make sure that display as shown

“T– : –“.

Note: Skew may occur at the upper side of the

playback monitor screen during the LP mode, do not mistook this for noise.

PI 2s050

TB-1 board

~-._-_.----_.--------T

L------------- == z =-_: ---- = c = =------- =-------- : : : -_-_-_-o-_@—---: -_-_T

TB-2 board TP101 VIDEO OUT

RF converter ~

cz=--------------------------------- ~

________________ _______________

,---

L_-- _-- __-- _ -__-----,

---------- —-—- —----- .

{~j VR201

VR 102

IC201

BIAS

AGC ,--

VIF unit

e----------

~--.,l::e,e, VRICM

l------.-~

TP103:L!?.’+-J

DEV

L-------- _--_ ---_ --__-,

. -------—---------—--

TP202 ● ● TP201

[-----------1 VR103

Tuner

(COLD)

(HOT) Q1012 ;

Iclol

< CAR

L-–_ --___________J_J

7) i---------- +.~ ~------~

c=-----_,__------,

______________

[-:::::-] ~::-:::]

: ----

IC162 ‘>

TP102 $ 1,~-j L-----_,

TN.3 ()- VR631

lC26~

IC261

VR101 PB-Y

board

SEPARATION

~===___ ---__3

--------

0 ‘iii; 00

TN-7 board

~------_-l

----------

IC234

IC603

IC233 ~~==:::

C:----- __,

------

TM-8 board

j ~VR236

VR351 ;---:

I I R-PB

vR239

SW-P ,%

+. :,ej

BPF >--+-1 ‘R235

~--___------_l

,-~,,e 1..., L-PB

[e:

IC231

(e); -’

IC351 1

VR243 .-. ●

:.9,:TP243

VR233

----------- J

VR243

TP:33 L“Fo

R-FO

TP:34 r-: :;

; ! CN251

IC301

II :*

IC304

,.--7 L--’;

Fig. 2-2-1 CP-1 board (Foil side view)

—4—

—

Page 6

3513V11(N)

2-3. VIDEO CIRCUIT ADJUSTMENT

“

Use the Relay jig mentioned in the 2-1. PREPARATION to provide simple adjustment of the Video Pre-amp unit. o Before these adjustments place the unit in the SP mode. “ Unless otherwise specified, all test point and adjustment location on the CP-1 board.

—

10 —

—

Item

AGC

LEVEL

PB-Y

LEVEL

CARRIER

SET

DEVIATION

Input

Colour bar

(100% white

level) from

Colour bar

generator

Alignment

cassette

(VHJ-0008

VHJ&23)

Colour bar

(100% white

level) from Colour bar

generator

No-signal

Colour bar”

(100% white

level) from

Colour bar

generator

Mode

E-E

PLAY

REC

(Adjust-

ment)

PLAY

(Check)

Point

TP102

VIDEO

OUTPUT

TP101

TP103

VIDEO

OUTPUT

TP101

Location

VR102

VR101

VR103

VR104

Remark

W25V03C

T 100% white

L@4E?:

1. Terminate VIDEO OUTPUT terminal with a 75 ohms.

2. Adjust VR102 so that the level is 0.50*

0.025 VP-P.

W25VO01

-1 tXIO~ white

* 0.05 Vp-p

1. Terminate VIDEO OUTPUT terminal with a 75 ohms.

2. Adjust VR101 so that the level is 1.00 *

0.05 Vp-p.

Input the PAL colour bar signal to VIDEO INPUT terminal. Set the channel selector buttons to the “AV”

position and put the VCR in the REC mode. After removing the first colour bar signal input from the video input terminal, immediately adjust VR103 so that the frequency becomes 3.83 * 0.05 MHz.

W25W@

-1OOYO white

* 0.05 Vp-p

1. Terminate VIDEO OUTPUT terminal with a 75 ohms.

2. Insert the blank tape to the VCR and record colour bar signal.

3. Playback the recorded part, and check that the level is 1.00* 0.05 Vp-p.

4. If the adjustment value is not satisfactory,

adjust VR104 and repeat step 3.

—5—

Page 7

3513V21(N)

—

b —

—

Item

C REC

CURREN

Y REC

CURRENT

Input

Colour bar

from

Colour bar

generator

Colour bar

from

Colour bar

generator

Mode

REC

Point

TP181 (HOT)

Shield case

(GND)

(Video pre-

amp unit)

TP181 (HOT)

Shield case

(GND)

(Video pre-

amp unit)

Location

VR181

(Video pre-

amp unit)

VR182

(Video pre-

amp unit)

Shield case

TP181 REC CURRENT

Remark

W15vcm

155 * 5

mVp-p

1. RotateVR182 so that the luminance level is minimize.

2. AdjustVR181 so that the signal level is 155 * 5 mVp-p.

W25V028

520 *20 mVp-p

+lL

-IL 1

H sync

1. Connect the ground of the oscilloscope to

the Shield case of Video pre-amp.

2. Set the channel selector buttons to the AV

3 AdjustVR182 so that the signal level at the

P08v03(

VR181

VR182

REC-C

REC-Y

I / \ l-l

TP291

AF REC

Fig. 2-3-1

TP163

TP;82

SW PULSE ENVELOPE

Video pre-amp unit

—6—

Page 8

3513A11(N)

2-4. AUDIO CIRCUIT ADJUSTMENT

NOTE: When re~airing and adjusting the CP-1 board and AD-2 board, use the optionally supplied Relay jig (VHJ-0088)

since the”flexib~e PCB for connecting to the AD-2 board is short. Connect the Flat cable end to CN271 on the AD-2 board and other end to CN251 on the CP-1 board.

SEITING BEFORE ADJUSTMENT

The audio input terminal of the audio signal generator should be terminated at 600 ohms. The audio output terminal of the VCR should be terminated at 47 killo ohms (L ch and R ch).

o O/AVbutton ontheremote control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. AV mode.

o AUDIO output button on the remote control unit

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

STEREO mode.

“ SP/LPselect button onthe remote control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. SP mode.

. REC LEVEL control (except VHR-2901R, VHR-291 E)

. . . . . . . . . . . . . . . . .Center (click stop) position.

c REC BALANCE control (except VHR-2901R, VHR-291 E) . . . .

. . . . . . . . . . . Center (click stop) position.

TB- 1 board

r------------ _-----_-7

. -----------— --------------- ---- —----—---- -

------------------- -- —-—---

----- ------- .

TB-2 board

00 TP101 VIDEO OUT

RF converter I

cz _________ ----------------- ---------

L --- _ -- _ ---- _-------J

-— —----- —— ------- --------- —---- -

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

[?:

VR201

-—-_m

VR 102

, ,

IC201

BIAS

AGC ,.-

VIFunit

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

r-”!!e’!(a, ‘R’ M

L-_-- _--------- _-_----J

C--------J

TP103@t--~-L--J DEV

. ----- —-—------ —-----,

TP202 ● ● Tp201

~-----------] VR103

Tuner

(COLD)

(HOT)

Q1012

Iclol ; CAR

L_-------- _--___ -.--J

,7)

~-_---_7

===_ ---- _--_ -___-=

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

L---------- +-. =

: . . . . .

TPI 02 ~ i.~.~

~lc1621;

TN-3 0- VR631

~-::::::] ~::-:::]

‘.

L------,

IC262 IC261

VR101 PB-Y

board

SEPARATION

CZZZZZ===Z=Z3

n ‘:ii”’

TN-7 board

~----_-_-. L--------J

IC603

I IC233

,------ ...,

. . . . . .....

cr_:-zzz =2

——

TM-8 board

VR351 ,---:

; j VR236

SW-P “9J

IC234

r-; :i

~ { CN251

IC301

IC304

L.)

~.-., ! t’

L--l

~--_-_-_--_l-l

r’

IC351 \

L_--_----_-

-J

Fig. 2-4-1 CP-1 board (Foil side view)

—7–

Page 9

3513A21(N}

Hi-Fi AUDIO CIRCUIT

Q The Hi-Fi AUDIO section adjustment has separate adjustment items for the Lch and R ch. The R ch adjustments are included in

parentheses.

c Unless otherwise specified, all test point and adjustment location on the CP-1 board.

10 .

—

Item

A-FM

CARRIER

‘REQUENCY

Input Mode Point Location Remark

1. Set the O/AV button on the remote control unit to the AV position and place in the SP record mode without a signal.

2. Connect a frequency counter to TP233 (TP234) and ground.

3. Adjust VR233 (VR234) so that the carrier frequency is 1.4 MHz (1.8 MHz) +4/-6 KHz.

TP233

(L ch)

TP234

(R ch)

AUDIO

OUTPUT

L ch, R ch

terminals

(Rear panel)

VR223

(L ch)

VR234

(R ch)

VR239

L ch (R ch)

VR243

No-signal

REC

PLAY

E-E

n ‘OOD

‘25

V’””n ‘0’00”

Alignment

cassette

(VHJ-0080)

A-FM

BPF

A-FM

NR FILTER

A-FM PB

LEVEL

Connect a oscilloscope to AUDIO OUTPUT

L ch (R ch) terminal. Press the Auto-tracking button on the re-

mote control unit. Playback the alignment cassette and observe the waveform on the audio output. Adjust VR239 until the noise component of both channel is minimum level.

Audio signal

(5 KHz, -17

dBm) from

Audio signal

generator

1. Adjust VR243 so that the output level is minimum.

2. After this adjustment, be sure to readjust step 2 A-FM BPF.

TP243

1. Press the Auto-tracking button on the remote control unit and playback the alignment cassette.

2. Adjust VR235 (VR236) so that the playback level is -7 f 0.5 dBm.

AUDIO

OUTPUT

L ch, R ch

terminals

(Rear panel)

VR235

(L ch)

VR236

(R ch)

Alignment

cassette

(VHJ-0020)

PIAY

NORMAL AUDIO CIRCUIT

. Press the AUDIO output select button to the Mono (No indication) position. “ Unless otherwise specified, all test point and adjustment location on the CP-1 board.

Input Mode Point Location

TP201 (HOT) rP202 (COLD)

VR201

Remark

10.1 Item

BIAS

LEVEL

1. Set the O/AV button on the remote control unit to the AV position and place in the SP record mode without a signal.

2. Adjust VR201 so that the signal level is 27 mVrms.

3. Confirm that the bias frequency is 70& 5 KHz.

No-signal

REC

—8—

Page 10

3513A31(N)

2-5. LEVEL METER CIRCUIT ADJUSTMENT... Except VHR-291 E

“ When repairing and adjusting

the CP-1 board and AD-2 board, use the optionally supplied Relay jig (VHJ-0088) since the flexible PCB for connecting to the AD-2 board is short. Connect the Flat cable end to CN271 on the AD-2 board and other end to -CN251 on the CP-1 board.

o Unless otherwise specified, all test point and adjustment location on the AD-2 board.

10. Item

Input

Mode Point Location

Remark

1. Connect an Audio signal generator to AUDIO INPUT terminals, and the AC volt-

meter to the AUDIO OUTPUT terminals.

2. Press the

“0/AV” button on the remote

control unit to the AV position.

3. Press the AUDIO output button on the re-

Audio signal

AUDIO VR241

mote control unit to the Stereo mode.

AUDIO

(1 KHz, -7

OUTPUT

(L ch)

4. Set the REC LEVEL control to the center

1 LEVEL

dBm) from

E-E

L ch, R ch

(click stop) position. ... (not necessary for

METER Audio signal

terminals

VR242

VHR-2901R)

generator (Rear panel) (R ch)

5. Adjust output level of the Audio signal generator is -7.0 dBm, and adjust VR241, VR242 so that illuminates the -4 dB LED.

6. Adjust output level of the Audio signal generator is -7.5 dBm, and adjust VR241, VR242 so that confirm only the -4 dB LED goes out.

7. Repeat step 5 through 6 if necessary.

WSA021

CN271

L. ------ .-.)

❑

VR241 L ch

❑

VR242 R ch

Fig. 2-5-1 AD-2 board (Parts side view)

—9–

Page 11

2565 M141N)

2-6. MTS (Multiplex TV System) DECODER CIRCUIT ADJUSTMENT

“ Unlessotherwise specified, all test point and adjustment location on

the TN-3 board.

No.

Item

STEREO

SEPARA-

TION

STEREO

(1 17.5 Hz)

BILINGUL

(274.1 Hz)

Input

Audio signal

(R ch...l KHz

100% mod.

L ch...4OOHz

unmod.)

from

Audio MPX

TV signal

generator

broadcast

(Stereo)

broadcast

(Bilingul)

Mode

E-E

Point

AUDIO OUTPUT terminal

(L ch)

IC631 pin 5

IC631 pin 6

Location

VR631

adjustable

through

CP- 1 board

VR632

Remark

1. Set the pilot signal for the stereo mode. With the L ch unmodulated, provide 1 KHz 100% modulation on the R ch.

2. Connect an oscilloscope to the audio output terminal (L ch) and adjust VR631 for minimum waveform peak-to-peak value.

1. Select the TV channel to stereo program me.

2. Adjust VR632 so that the waveform is max-

imize.

1. Select the TV channel to builingul programme.

2. Adjust VR633 so that the waveform is maximize.

VR633

PI 0MO04

1[—[5 ~ 1

~1”

CN632

VR631

CN631

SEPARATION

VR632 VR633

117.5 Hz 274.1

tiz

Fig. 2-6-1 TN-3 board (Parts side view)

—lo—

Page 12

3517X11(N)

2-7. VIDEOTEXT DECODER CIRCUIT ADJUSTMENT... For VHR-294G, VHR-29SP

- Unless otherwise specified, all test point and adjustment location on the TM-6 board.

Item

DECODER

V)(O

Input

NONE

Mode

E-E

Point Location

CT771

Emitter of

QI012

[CP-1 board)

Fig. 2-4-1

PI Oxm

Remark

Set the varticai scale (VOLTAGE/DIV.) of

the oscilloscope to 10 mV/DIV.. Connect the frequency counter to Emitter of Q101 2 and ground through a pre-amp of the above oscilloscope. Press the “MENU” button on the remote control unit.

After the frequency off by turning CT771 for

moment. Adjust CT771 so that the fraquen-

cy is 4433619 t 50 Hz.

Fig. 2-7-1 TM-6 board (Parts side view)

.-/’

4’

.-J

—11–

Page 13

3513U11(N)

2-8. TUNER IF CIRCUIT ADJUSTMENT

N10. Item Input

Mode

Point

Location Remark

Receive the middle electrical field (60 dB 80 dB) of the TV channel, and slowly turn

VR61 1 from the point where snow-noise is

1 RF AGC

-IV E-E

TV screen

VR611

present to the point where itjust disappears

broadcast

(VIF unit)

from the monitor TV.

2. Confirm by monitor w that there is no beat and saturation (S/N is best point) when receiving any TV channel.

VR611

RFAGC~

Ic 611

~-’’ard

Po3uw

Fig. 2-8-1 VIF unit (Parts side view)

—12–

Page 14

3S02S1 l(N)

3. DISASSEMBLY PROCEDURES

3-1. REMOVAL OF REMOTE CONTROL UNIT CASE Open the remote control unit case as follows. Although a large type remote control unit is shown in the figure bellow, small type remote control unit can be opened by the same procedures. NOTE: When opening the remote control unit for repairing, use a GUITER PICK made of plastic (1mm thickness) shown in the Fig. 3-1-2 or the like (a thin plastic piece) to prevent scratch ing.

Never use a metal screwdriver to avoid scratching.

1. Open the battery cover and take out batteries, the then remove the bottom case fixing screw.

2. Applying force strongly to the battery compartment edge in the arrow (A) direction by your thumb as shown in Fig. 3-1-1 to make a space

(B) between the bottom and upper

case as shown in the cross section Fig. 3-1-3.

—

Fo7aool

Edge

Bottom case –

Make a sDace

Battery

‘/

compartment

Upper case

Fig. 3-1-1

[B)

m7aoo3

GUITERPICKor

Thin plastic piece

Fig.

3-1-2

Make a space [B)

r#~

;;[ER

“ye,..

Hooks

(F)

Bottom case

Upper case

Fig. 3-1-3

To make this procedure easier, push the remote control unit end (C) against your body Fig. 3-1-4. Insert the GUITER PICK above mentioned into the space

(B) as shown in Figs. 3-1-3, 3-1-4 and move the PICK in

the arrow (D) and (E) direction, then disconnect two hooks (F) of the top of the cases.

Applying force to the space

(B) and battery compartment

edge by your thumb so that the bottom case is separated from the upper case as shown in the Fig. 3-1-5. Insert the PICK into the space (G) of the case side slantingly against the bottom case and move the PICK to disconnect the hooks

(H) of the side in order from top to

bottom Fig. 3-1-5. Disconnect the hooks of the other side using the pick by the same procedure as step 4,

, GUITER PICK

Fig. 3-1-4

/“

Battery ~ compartment

Bottom —

case

P37SOM

Keep a space (B)

ICK

-,.- ,,,,

Fig, 3-1-5

..-.”

—13—

Page 15

Mar/’92/57OO HA

Printedin Japan

—

SANYO Electric Co., Ltd. Osaka, Japan