Sanyo VHR-274G User manual

SERVICE MANUAL
Video Cassette Recorder
FILENO.
VHR-274G ~~etmwmy,
VHR=274EX
(GeneralEurope)
VHR-430
(NewZealand)
CONTENTS
SELF-DIAGNOSIS DISPLAY ............................2
I. DISASSEMBLY .....................................3
2. ELECTRICAL ADJUSTMENT .........................6
3. TEST POINT FOR TAPE PATH ADJUSTMENT ......... 13
4. PARTS LIST
ACCESSORIES ...................................14
PACKING MATERIALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CABINET &CHASSIS PARTS .......................14
MECHANISM PARTS .............................. 15
ELECTRICAL PARTS .............................. 18
CIRCUIT DIAGRAMS (Refer to the separate volume)
ml PAL
Please see other materials with Reference
No. given in table below.
Materials Model No. Reference No.
‘echa”
Manual tiHV%anisrn ‘s531346
~‘RODucT‘AFETY‘OT’cE
The components designated by asymbol (~)in this schematic diagram designates components whose vslue 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. Patisorder must contain model number, patinumber and description.
2. Substitute parts may be supplied as the service parts. :#:3@~
3. N.S. P.: Not available as service parts.
TK21G,EX,NZ 143 14S 1S,16,39 REFERENCE No. SM531367

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W(N)VH33WeSd

M1-14801xN)1/3
1. DISASSEMBLY
-1-1.REMOVALOFCABINET,MECHANISMUNITANDMAIN BOARD
REMOVING THE CABINET PARTS (Fig. 1.1.1) REMOVING THE CP-I 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 out the TM-1 PWB assembly while pressing and
clamps (C) using ascrewdriver, etc. and slightly rotating spreading outthefourclamps (H) as shown by the arrows.
the bottom part in the direction of the arrow. 2. Remove the two red screws (J). Next, remove the CP-I
Note: Electrical adjustments for the this model can be per- PWB assembly by lifting it straight up while pressing and
formed with only the cabinet removed. spreading out the two clamps (K) as ahown by the
arrows,
REMOVING THE MECHANISM MAIN UNIT (Fig. 1.1.2)
After removing the cabinet parts:
1. Remove the two screws (D), and then remove the bracket.
2. Remove the 22-wire flat cable from the MC-2 PWB, the 11-
wire flat cable from the VP-1 PWB assembly and the 6-pin
connector from the CP-I PWB assembly respectively.
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-TK4/E-l
Front Panel
Fig.1.1.1
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M1-14S18(N)3/’3
TEMPORARILY SElllNG 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 3. Place the CP-I PWB assembly above the mechanism
the chassis. main unit along the cassette holder. Insert the tip (L) of
2. Connect the 29-wire flat cable to the MC-2 PWB ,and the the terminal board into the opening (M) at the side of the
8-wire flat cable to the VP-1 PWB assembly, Connect the chassis, as shown in the enlarge view.
TM-1 PWB assembly to operate VCR by using the remote
control.
“L
8-wire Flat Cable
VP-1 PWB Assembly=
6
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chassis-KiiEiE
i
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M-TK2LE-4
cP-
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Mechanism Main Unit’
I
‘~/Q&’J\~\Mc2pwB ..s.t?W?..,Wr
ACE Head 6-pinConnector
Opening(M)
Fig. 1.1.4
1-2.MAINCIRCUITBOARD
L-TEl/G
Shield Case
(Power supply Part)
●TM-8 PWB
(For VHR -274G)
Y
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●TM-7 or TM-8 %$%Y\ rMC-2 PWB
(On the Mechanism Unit)
Tuner/lF/RF conv. Unit
TM-1 PWB --CP-I PWB Fig. 1.2.1
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SI-14801(N) 2/2
P1B08800C-S1
1— Shield case
,,,,”rrent1// \
TP181
TP183 SW-P +~~~,8~
TP182 ENV -
REC-YIC
IVP-1 PVVB Assembly 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.
Measuring Point Measuring Equipment ADJ. Condition
TPIOI Oscilloscope PIAY mode
(VIDEO OUT) Alignment tape
TP183 (SW-P) (VHJ-0009 or
VHJ-0023)
ADJ. Location ADJ. Value
VR351 (SW-P) 6.5 H10.5 H
1. Set the tracking control position to the center by pressing
CHANNEL buttons (+) and (-) simultaneously.
(Tracking center position display in the indicator
panel “T -:- “)
2. Adjust VR351 (SW-P) so that the width ‘T” becomes 6.5 H
A().5 Has shown in Fig. 2.1.3.
WS-SWP
T= 6.5 H*0.5 H
IFront edge of ~
Ivertical sync signal
tt
Rise RF. SW. PULSE
Fig. 2.1.3
2-1-4. STILL V-LOCK ADJ.
Measuring Point Measuring Equipment
Picture of Color bar generator
monitor TV or
Broadcasting
Monitor
/7
ADJ. Condition
Self-recording
(SP mode)
STILL mode
Blank tape
ADJ. Location ADJ. Value
CHANNEL (+) button The minimum vertical shake
CHANNEL (-) button
1. Play back the just-recorded portion and then set the VCR
in the STILL mode.
2. Press the CHANNEL (+) button or the CHANNEL (-) button
so that any vertical shake of the picture is brought to its
minimum.
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W(N)lOEV1-L

VI-14818(N)2/4
2-2-3. LOCATION OF ADJUSTMENT POINTS
P1BOB800C.V1
Shield Case
o
‘Yi’ “
@
-- 0
..—
TP181
REC current
TP183 SW-P
.- VR 182 REC-Y/C
,.>; TP182 ENV
VP-1 PVVEIAssembly Fig. 2.2.4
PlB243@3B-Vl/2
+
T
uo0●
,.. T,....,
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,,’
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...,,
..,.
0
VR351
IC602 SW-P
...............
...............
TM-8 PWB IC351
IC301
o... ..............
a;
!... VR201
IC201c1
BIAS f------j
,....
:e:; ~
,....,;
,0
POWER ;
~SUPPLY ~...
:,
;PART ;!:
VR104
1C162 VR102 ‘Ev
CT120 O’p /0
Vco [j-: IC161
............, Q
.... ..,t-.-::r..:r...:Tpl 03 .............
TP1 02°[9.::.9,:*..?c:’.:.: O
v<
Unit
ft .........
;TP101 TP120 V~~~3 VR101
:.......................! V.OUT PB-Y
CP-I PWB (FOIL SIDE) Fig.2.2.5
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0
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