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Adjustment in the Service Mode
Sound Input Level Adjustment
1. Connect a signal generator to TP301 (C3407, - side) on
the Main Board and ground. Signal output=300Hz, 150mVrms.
2. Connect a DC Volt-Meter to TP-317 (C3437, + side) and
ground.
3. Ground TP-20 (base of Q131) with the jumper lead. (Setting
of the no signal condition).
4. Switch the TV set on.
Press and hold the MENU button on the TV set, then press
"3" button on the remote control transmitter to enter the
Service Mode.
MENU
O-R
5. Adjust voltage to become DC 500mVrms±10mVrms by
pressing the VOLUME(+/-) button on the remote control or
TV set.
6. To exit from the service mode, press the MENU button.
Stereo VCO Adjustment
1. Connect a frequency counter to TP317 (C3437, + side) and
ground.
2. Ground C161 with the jumper lead.
3. Switch the TV set.
Press and hold the MENU button on the TV set, then press
"3" button on the remote control transmitter to enter the
Service Mode.
MENU
O-R
4. Select "STEREO VCO" by pressing the CHANNEL
UP/DOWN button on the remote control or TV set.
5. Adjust the frequency to become 15.625KHz ± 0.1KHz by pressing
the VOLUME (+/-) button on the remote control or TV set.
6. To exit from the service mode, press the MENU button.
INPUT LEVEL
STEREO VCO
3
FILTER
LOW SEPARATION 29
HI SEPARATION
SAP VCO
ADJUST: - /+
CHOOSE:
(Service Mode)
INPUT LEVEL
STEREO VCO
3
FILTER
LOW SEPARATION 29
HI SEPARATION
SAP VCO
ADJUST: - /+
CHOOSE:
(Service Mode)
INPUT LEVEL
STEREO VCO
FILTER
LOW SEPARATION 29
25
23
32
26
Generator
27
EXIT:MENU
Volt Meter
25
23
32
26
27
EXIT:MENU
Frequency
25
23
32
-12-
MAIN BOARD
TP-A
TP20
Ground with
jumper wire
TP-D
C3407
TP301
Signal
GND
GND
MAIN BOARD
TP-A
TP20
Ground with
jumper wire
TP-D
C3407
TP301
Counter
GND
1H DELAY
Q111
IC201
Q243
Q242
X161
X242
KS
Q131
IC201
IF/VIDEO/CHROMA
Base
L171
VR191
AGC
X141
Q2
Q140
Q202
Q141
IC110
KP
Q
TP317
IC3401
MTS
C3437
1H DELAY
Q111
IC201
Q243
Q242
X161
X242
KS
Q131
IC201
IF/VIDEO/CHROMA
Base
L171
VR191
AGC
X141
Q2
Q140
Q202
Q141
IC110
KP
Q
TP317
IC3401
MTS
C3437
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