-11-
Service Adjustments
Important Notice:
Do not attempt to adjust service adjustments not listed below otherwise it may cause loss of performance and for
correct operation.
DCXO Adjustment
This adjustment is required when the crystal oscillator
(X201 or X4001) is replaced.
1. Input PAL-N color bar signal from the AV1 input terminal.
Set the brightness and contrast to normal.
2. Enter the service mode, and select item No.006 DCXO
Auto with
▲
or
▼
key.
3. Press key, and the adjustment will start,
then adjustment data will be changed automatically as
follows;
“0” --> “1” --> “0”
(Oscillation frequency adjustment will be completed
automatically.)
AGC Adjustment
1. Receive PAL-N color bar pattern.
(ANT Input Level: 62dB
µ
V, 75 ohms terminated)
2. Connect a Digital Volt Meter to Tuner-AGC terminal and
the ground.
3. Enter the service mode, and select item No.194 AGC
Take over with
▲
or
▼
key.
4. Adjust voltage of Tuner-AGC to become 3.2V±0.3V DC
with or - key.
White Balance Adjustment
Note: This adjustment should be made 10 minutes after
the TV is turned on.
[ Setting ]
1. Connect a colour-bar generator to the external video
(composite) input terminal (AV1 or AV3 terminal), and
input a White Pattern (90%) signal.
2. Set the television to following conditions:
Screen Size: FULL
Picture Mode: DYNAMIC
[ White Balance Adjustment ]
1. Enter the Service Mode.
Adjustment Item:
No. 147 SAGR (ADC Gain Red)
No. 148 SAGG (ADC Gain Green)
No. 149 SAGB (ADC Gain Blue)
2. Decide a fixed item which is maximum value “31”.
(Example, let 31 of No. 147 SAGR be maximum
value), select item of other 2 colours (Example, No.
148 SAGG or No. 149 SAGB) with
▲
or
▼
key, and
adjust to produce a normal black and white picture in
highlight areas with or - key.
After adjustment, confirm white balance again by
normal picture.
Note: Adjusted data is less than the fixed data.
Black Balance Adjustment
Note: This adjustment should be made 10 minutes after
the TV is turned on.
[ Setting ]
1. Connect a colour-bar generator to the external video
(composite) input terminal (AV1 or AV3 terminal), and
input a dark gray pattern (20% white).
2. Set the television to following conditions:
Screen Size: FULL
Picture Mode: DYNAMIC
[ Black Balance Adjustment ]
1. Enter the Service Mode.
Adjustment Item:
No. 144 SACR (ADC Clamp Red)
No. 145 SACG (ADC Clamp Green)
No. 146 SACB (ADC Clamp Blue)
2. Decide the fixed item which is maximum value “17”.
(Example, let 17 of No. 144 SACR be maximum
value), select item of other 2 colours (Example, No.
145 SACG or No. 146 SACB) with
▲
or
▼
key, and
adjust to produce a normal black and white picture in
dark gray areas with or - key.
After adjustment, confirm white balance again by
normal picture.
Note: Adjusted data is less than the fixed data.
