Sanyo C21LF37 Service Manual page 14

Service Adjustments
SOUND LEVEL ADJUSTMENT
1. Connect a signal to the antenna terminal with audio signal
of 1KHz at 100% modulated.
2. Connect a DC Volt-Meter to TP-317 ( pin-38 of IC3401)
and the ground.
3. Switch the TV set on, and set the Surround OFF.
Press and hold the MENU button on the TV set, and
press "3" button on the remote control transmitter to enter
to the service mode.
INPUT LEVEL
HI SEPARATION
LOW SEPARATION
ADJUST: - /+
CHOOSE:
EXIT : MENU
5. Adjust voltage to become DC 400mVrms±20mVrms at
TP317 by pressing the Cursor (or VOLUME) + or -
button on the remote control or TV set.
6. To exit from the service mode, press the MENU button.
STEREO SEPARATION ADJUSTMENT
1. Connect an oscilloscope:
Probe-A to TP-317 (pin-38 of IC3401) and the ground.
Probe-B to TP-318 (pin-39 of IC3401) and the ground.
2. Turn on the TV set, and receive the multi sound programme.
3. Press and hold the MENU button on the TV set, and press
"3" button on the remote control transmitter to enter the
service mode.
4. Select "LOW SEPARATION" by pressing the CHANNEL
UP/DOWN button on the remote control or TV set.
INPUT LEVEL
HI SEPARATION
LOW SEPARATION
ADJUST: - /+
CHOOSE:
EXIT : MENU
5. Adjust the level of 300Hz at TP-317 (pin-38 of IC3401)
to become minimum level by pressing the Cursor + / - or
VOLUME + / - button on the remote control or TV set.
08
21
34
08
21
34
TP-317(pin-38 of IC3401)
JW1
3
1
KL
C042
TP-317(pin-38 of IC3401)
TP-318 (pin-39 of IC3401)
JW1
3
1
KL
C042
TP-317(R)
Minimum leakage
300Hz
-14-
JP3405
JP3402
C3432
IC3401
C3401
IC3401
C3413
MAIN BOARD
(Solder side)
JP3405
JP3402
C3432
IC3401
C3401
IC3401
C3413
MAIN BOARD
(Solder side)
JW4
C3416
C3412
C3408
JW4
C3416
C3412
C3408