Sanyo VHR-I 50 series User manual

Sq#4/m
-
Service Manual Video Cassette
Recorder VHR-I 50 series
VHR-153G
VHR-154G
VHR-141
VHR-171, SP
VHR-150G
Fii51Iw
PAL
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
2-2. SERVO CIRCUIT ADJUSTMENT ................................................. 4
2-3. VIDEO CIRCUIT ADJUSTMENT .............................................*.... 6
2-4. Videotext DECODER CIRCUIT ADJUSTMENT .............................. 8
2-5. AUDIOCIRCUIT ADJUSTMENT .................................................. 9
2-6. TUNER lFCIRCUIT ADJUSTMENT ............................................... 9.
s, DISASSEMBLY PROCEDURES
3-1. REMOVAL OF REMOTE CONTROL UNITCASE ............................. 10
SP4, SP4V series REFERENCE No. WM530862

3103L11(N)
1. CIRCUIT BOARD LOCATIONS
1-1. MAIN BOARDS
TM-2
L13L040
/- CP-1(Video, Servo &Audio) board
w-l (PowerSUPPW)hard ~rTB-1 (Terminal) board
~(Control) oard
TM-1
Tunin det.) board
CP-2 (Servo &Syscon) board -/ \‘TM-8 (VPS)board
‘h.._.-T6-6 (Video text decoder) board
Installed specific equipment and models
TM-5 (OSA on screenassist)board:VHR-150G, 150E, 150EX, 150EE, 1501,1501R,150HD, 150SA, 150PS, 150, 141,171and 17SP.
VD-1 (MESECAMdet.)board:VHR-150G, 150EX, 150EE, 150PS, 153G and 154G.
TM-8 (VPS)board:VHR-150G, 153G and 154G.
TM-6 (Videotextdecoder)board:VHR-153G and 154G.
!!g
1-2. LOCATION FOR TAPE PATH ADJUSTMENT .?
NOTE: Test DointTP182 and TP183 for tape path adjustment is shown in figure below.
For adjustment, refer to the separate volume-’’Mechanism Service Technical Information”.
POSLO12
Shieldcase
\11
0
/\-\
TPI83 TPI 82 CN181
SW-P. Erw.
Fig. 1-2 Pre-amp Unit
...?,.:,
,.. :,,’. —l—

3103J11(N)
2. ELECTRICAL ADJUSTMENT
-
L
“L
2-1. PREPARATION
2-1-1. EQUIPMENT
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Colour TV monitor
PAL Colour-bar generator (with RF and LINE OUTPUT)
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-0051 )Check for D.O.C.
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.
Relay jig (VHJ-0066) 7-wire cable for Pre-amp unit
Relay jig (VHJ-0084) for CP-1 and CP-2 board
Relay jig (VHJ-0085) for Video pre-amp unit
2-1-2. CONNECTING THE RELAY JIG
When repairing CP-1 and CP-2 board
(seeFigs.2-1-2 and 2-1 -3)
NOTE: The connection of any Relay jigs can be done
without removing the front panel of the main unit.
1. Remove the seven screws of the CP- 1board to take out
with CP-2 board connected.
2. Insert the CP-1 board with CP-2 board connected in the
slit of chassis as shown in Fig. 2-1-3 (right).
3. Connect CNOI and CN02 of Relay jig (VHJ-0084) into
connectors of the PW-I board and the Pre-amp unit, in the
direction of arrow as shown in Fig. 2-1-3 (left). Fix the
relay jig with screw if necessary.
4. Connect 12-pin, 8-pin and 4-pin connectors of the Relay
jig to connectors CN541, CNI 01 and CN201 on the CP-I
board, respectively.
5. Connect connector (1) from ACE head to CN06 of the
Relay jig (VHJ-0084).
6. After finishing the repairs and adjustments, put the Flat
cables back to its former position.
When repairingthe Pre-amp unit
(seeFigs.2-1-1 and 2-1 -4)
1. Remove the Pre-amp unit from the chassis, connect
Relay jig (VHJ-0066) between the Pre-amp unit and
drum assembly.
2. Connect Relay jig (VHJ-0084) excepting 8-pin connector
between the PW- 1board and CP- 1board as shown in
Fig. 2-1-4. Fix the relay jig with screw if necessary.
3. Connect Relay jig (VHJ-0085) between the top of Pre-
amp unit and CNIOI on the CP-I board.
NOTE: When repairing or adjusting the Pre-amp unit,
temporary fasten or securely touch one end of the
shield case to the metal chassis.
Kwco9
CN02 connectorto
CN181 of Pre-ampunit
8-pin connectorto
CN101 ofCP-1 board
Relay jig VHJ-0085
Fig. 2-1-1
l“w-!-
CN06 connectorfrom
connector(1) Ak:::y;:yzrd
8-pin mnnectorto
‘CN101 ofCP-1 board
c.-
CN511 of PW-1 board \S 4-oin ccmnectorto
Relay jig VHJ-0084 wCN201 of CP-1board
Fig. 2-1-2
—2—

3103J21IN) m
P1OJO11
Relayjig (VHJ-0064)= I--CNO6 forconnector(1)fromACEhead
iwl
Pre-amp unit 8-pm connector toCN101
/4-pm connector to CN201
Flat cable (24-wire cable)
ACEhead
Fig. 2-1-3
Relay
Leadwires ofconnector(1)
Remove8-pin connector
Pre-ampunit ofjig(VHJ-0084)
jig(VHJ-0066)
Flatcable -u
Yr’((11 Fig. 2-1-4
POSJO12
2-1-3. SET-UP
Because the RF input signal is used for circuit adjustments, .Check to be sure that there is no spike noise in the sync
connect the colour-bar generator to the ANT IN terminal of part of the horizontal sync signal.
the VCR. The RF input signal is processed by the tuner and
lFcircuit. It is improtant that thevideooutput signal of the IF W05J031
circuit satisfies the items shown in Fig. 2-1-5. Connect the
oscilloscope to the VIDEO OUTPUT terminal of the video
circuit and terminate with a75f) load, and then check the
video output signal.
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.
I
While observing the oscilloscope or TV screen, make Hsyncsignal
fine-tuning adjustments so that the colour burst Fig. 2-1-5
amplitudeis approximately0.3 Vp-p.
—3—

3103S1 1(N)
2-2. SERVO CIRCUIT ADJUSTMENT ..... CP-1 board and Video pre-amp unit
NOTE (1) :These adjustments should be carried out upon completion of the transport adjustments.
(2) :If the tape transport adjustments are carried out after these adjustments, follow the procedures again in SWITCHING
POSITIONS.
—
10.
—
1
2
—
Item
SWITCHING
POSITION
SLOW
TRACKING
for
SP MODE
i,
Input
Alignment
cassette
(VHJ-0009
VHJ&23)
Colour bar
from
Colour bar
generator
Mode
PLAY
(SP mode)
REC
J
PIAY
1
SLOW
(SP mode)
Point
VIDEO
OUTPUT
TP101
RF SW
pulse
TP183
(Video pre-
amp unit)
TP183
RF SW
Pulse
J3042
CTL
Pulse
Location
VR351
VR353
Remark
W25S031
Videosignal
7654321 —
Vsync
1.
2.
Press the tracking control (+) (-) buttons
simultaneously to the center position
(on the display ‘T –:– “).
Adjust VR351 so that the phase of the
leading edge of the vertical sync signal
is delayed 6.5 y0.5 Hfrom the rise of
the RF switching pulse waveform.
W20SOOS
CTLpulse ~1
~12*1 msec
RF switching
pulse
1. Playback the recorded part, and VCR in
the SLOW (SP) mode by remote control
unit.
2. Press the tracking control (+)(-) buttons
simultaneously to the center position
(on the display ‘T –:– “).
3. Adjust VR353 so that there is atrigger
of the peak level of the positive pulse
reading edge of the CTL pulse and the
time from this point to the leading edge
of the RF switching pulse is 12 t1
msec.
4. Confirm that the noise at the “+” and “-”
terminals for tracking adjustment is
same at the upper and lower edges of
the screen. If not, readjust VR353.
Shieldcase
F o m0[ @-@}_! r
TP183 TP182 CN181
SW-P. ENV.
Fig. 2-2-1 Video pre-amp unit
—4—

3103S21(N)
k). Item Input Mode Point Location Remark
W20S01o
CTL pulse n
I
~19 =1msec
RF switching
pulse
1. Playback the recorded part, and VCR in
REC TP183 the SLOW (LP) mode by remote control
SLOW Colour bar IRF SW unit.
zTRACKING from PLAY Pulse 2. Press the tracking control (+)(-) buttons
for Colour bar iVR354 simultaneously to the center position
LP MODE generator SLOW J3042 (on the display “T –:– “).
(LP mode) CTL 3. Adjust VR354 so that there is atrigger
Pulse of the peak level of the positive pulse
reading edge of the CTL pulse and the
time from this point to the leading edge
of the RF switching pulse is 19 &1
msec.
4. Confirm that the noise at the “+” and “-”
terminals for tracking adjustment is
same at the upper and lower edges of
the screen. If not, readjust VR354.
P13S034
TP201(HOT)
@TP103[6”: ~-
TP?02 !,?-;
/II
119
;Ic :TP101
;101! VIDEO+@ [:?
(-0: .-.
~o:
:6::. --; #OUT 1@CN
VR;O1 .@-’ I1:[861
81AS VR102 VR101 I10,
.--- ————-- -! II:J
EE P8-Y ‘- ~ti-%-O-S~- ~Irl
VD-1 II
r, MESECAM II
~--_7 IL?
101’
--------
I__. -____: E,Idet. ;–--;1 I1:!
[-; CN331 IC201 ,1 II IIoICN
Q1102:? II I@
II II
,1 II 1851
‘1:1
II II I~,
;; II II I~1
II d
~_-__-a
i! :1 II VIF ~,----1
II IC301 I:-@; IIC1ll’: ~J “unit I I
1, L------ ,Tunerl I , , ~
II r.
IJ ,1 III
;1 II I
, j VR351 ‘7 II
t---- TN-7~~ [[j IIRF ;
:-J SW-PO. TM-8 VPS I ‘ conv.1
i~-—----, Sync.\l ~II I I ,
---------
1--.,
,--- .--:0) det. ‘1 III
‘1 I,1
J[ I
:o~o,ti- 20 120 1IL___
7\
II
-. .L---J L-–-j
oK::;;5;:I:J0 “-:-– ----_:::~o LJ
~~J3042 0‘- -CW301 #
VR353 VR354
SPSLW LPSLW Fig. 2-2-2 CP-1 board (Foil side view)
—5—

‘-
.-/
31OOV1 1(N)
2-3. VIDEO CIRCUIT ADJUSTMENT ... CP-1 board and Video pre-amp unit
NOTE (1) :Use the Relay jig mentiond in the 2-1. PREPARATION to provide easy adjustment of the Pre-amp unit.
(2) :When adjustment No. 1, No. 2and No. 5below, terminate VIDEO OUTPUT TP101 at 75 ohms.
(3) :‘No-signal REC mode’ is not to supply any signal to VIDEO INPUT terminal.
—6–

do. Item Input Mode Point Location Remark
WI5vfxi6
t
TPI 81 (HOT) 34* 2mVp-p
Colour bar i
CREC from shield case
6CURRENT Colour bar REC (GND) VR181
(Video pre-
generator 1. Rotate VR182 so that the luminance
amp unit) level is minimize.
2. AdjustVR181 so that the level is 34 *2
mVp-p.
W20VO07
7
m
130 *5mVp-p
,.,. TP181 (HOT) J
YREC shield case
7CURRENT No-signal REC (GND) VR182
(Video pre- 1. Set the channel selector buttons to AV
amp unit) position and put the VCR in the no-
signal REC mode.
2. AdjustVR182 so that the level is 130 &
5mVp-p.
3. Follows are the applicable models and
their corresponding mark.
P60V012
Shield case VR181 VR182
\
REC-C REC-Y
o
<P o
?o
TP181 CN181
Fig. 2-3-1 Video pre-amp unit
,., ,.
.. -.
..
—7—

31WX12(N)
2-4. VIDEO TEXT DECODER CIRCUIT ADJUSTMENT ... TM-6 and CP-1 board
—
10
—
1
.
Item
DECODER
Vxo
Input
NONE
Mode
E-E
Point
Emiter of
Q1 102
(CP-1 board)
Fig. 2-2-2
see page 5
Location
c761
Remark
1.
2.
3.
4.
Set the vartical scale (VOLTAGE/DIV.)
of the oscilloscope to 10 mV/DIV..
Connect the frequency counter to
Emitter of QI 102 and ground through a
pre-amp of the above oscilloscope.
Press the “MENU” button on the
remote control unit.
Adjust CT761 so that the frequency is
4433619 t20 Hz.
POSXO03
n
764
ti
[
IC761
[
IC769
TP762 (GND)
Fig. 2-4-1 TM-6 board (Partssideview)
—8—

31CDA11(N)
2-5. AUDIO CIRCUIT ADJUSTMENT ... CP-1 board
do. Item Input Mode Point Location
1BIAS No-signal REC TP201 (HOT)
LEVEL TP202 VR201
1I1 1 1
Remark
1. Set the channel selector buttons to the
AV position and put the VCR in the no-
signal REC mode.
2. Adjust VR201 so that the level is 23
mVrms.
2-6. TUNER IF CIRCUIT ADJUSTMENT ... VIF unit
NOTE: There are two of the VIF unit’s type and different with the model (shown in figure below).
Vo
1
—
Item Input Mode Point Location
RF AGC Tv
broadcast E-E TV screen VR611
Remark
1, TurnVR611 inthe direction which causes
snow to appear, then in the opposite
direction until the snow just disappears.
TYPE A
board T
yyc-Q
Ic
611
CP-1 board
p- ...../.r/. </. z...t ........<
TYPE B
Fig. 2-6-1 VIF unit (Partsside view)
——
-1
d
—9—

31OOB11(1)
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 aGUITER PICK made of plastic (1 mm thickness) shown
in the Fig. 3-1-2 or the like (a thin plastic piece) to prevent
scratching.
*Never use ametal screwdriver to avoid scrathing.
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 aspace (B) between the bottom and upper
case as shown in the cross section Fig. 3-1-3.
To make this procedure easier, push the remote control
unit end (C) against your body.
m7aool
Edge
aspace (B)
tment
Bottom
c
Fig. 3-1-1
Po7aoo3
GUITER PICK
c
Fig. 3-1-4
—lo—
3. Insertthe GUITER PICKabove mentionedintothe 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.
4. 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.
5. Insert the PICK into the space (G) of the case side slanting-
ly by against the bottom case and move the PICK to
disconnect the hooks (H) of the side in order from top to
bottom.
6. Disconnect the hooks of the other side using the pick by
the same procedure as step 4.
Po7aooz
a’
GUITERPICKor
Thinplasticpiece
Fig. .3-1-2 Make aspace(B)
r*”
r#~ER
“y<j
Hooks (F)
Bottom case Uppar case
Fig. 3-1-3
m7aoo4
Keep aspace (B)
CK
(H)
Fig. 3-1-5

SqfjNmio
‘..-/
SANYO Electric Co., Ltd.
OSAKA, JAPAN
Apr./’96400OO HA Printed in Japan