Audiocircuit Adjustment - Sanyo VHR-290 Series Service Manual

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
o
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
I
r------------ _-----_-7
. -----------— --------------- ---- —----—---- -
1
------------------- -- —-—---
----- ------- .
#
TB-2 board
00 TP101 VIDEO OUT
RF converter I
1
1
cz _________ ----------------- ---------
3
L --- _ -- _ ---- _-------J
-— —----- —— ------- --------- —---- -
-----------------
[?:
VR201
-—-_m
VR 102
,
1
I
,
,
IC201
BIAS
AGC ,.-
VIF unit
t
------------- r-"!! e'!(a, 'R' M
L-_-- _--------- _-_----J
C--------J
TP103@t--~-L--J DEV
. ----- —-—------ —-----,
I
I
TP202 Tp201
~-----------] VR103
I
Tuner
,
(COLD)
(HOT)
Q1012
Iclol ; CAR
L_-------- _--___ -.--J
,7)
~-_---_7
===_ ---- _--_ -___-=
-------------
L---------- +-. =
: . . . . .
TPI 02 ~ i.~.~
~lc1621;
TN-3 0- VR631
~-::::::] ~::-:::]
'.
L------,
IC262 IC261
1
VR101 PB-Y
board
SEPARATION
CZZZZZ===Z=Z3
n ':ii"'
00 TN-7 board
~----_-_-.
L--------J
IC603
I IC233
,------ ...,
. . . . . . ... .
cr_:-zzz =2
——
TM-8 board
I
VR351 ,---:
; j VR236
SW-P "9J
u
IC234
r-;
:i
~ { CN251
o
IC301
:i
,,
IC304
L.)
~.-.,
! t'
L--l
~--_ -_ -_ --_ l -l
1, I
r'
IC351 \
L_--_----_-
-J
Fig. 2-4-1 CP-1 board (Foil side view)
—7–