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SERVICE ADJUSTMENTS
[ADJUSTMENT]
How to adjust the each service data, please see "ADJUSTMENT MODE" on page 13 for entering the service mode ,
selecting service item and adjusting the service data value.
IMPORTANT NOTICE
Do not attempt to adjust the following service adjustments except requiring the readjustments in servicing
otherwise it may cause loss of performance and product safety.
IF VCO ADJUSTMENT
PAL BG VCO ADJUSTMENT
1. Apply 38.9MHz signal with 90 ±10dBuV/75Ω
terminated to IF terminal on the tuner.
2. Enter to the service mode and select mode
"REGULAR", item "REGULAR 1VC1".
3. Press the
or
button to set data value to be
"10".
RF-AGC ADJUSTMENT
1. Receive colour bar pattern with 63dBuV/75Ω
terminated signal gain.
2. Connect digital voltmeter to TP-AGC and GND.
3. Enter to the service mode and select mode
"REGULAR", item "REGULAR 3AGC".
4. Press the
or
button to adjust voltage to be
3.2Vdc.
VIDEO LEVEL ADJUSTMENT
VIDEO LEVEL ADJUSTMENT-1
1. Receive colour bar pattern.
2. Connect oscilloscope to terminal TPVIDEO and GND.
3. Adjust amplitude "a" to be 2.0Vp-p by using VR221.
VIDEO LEVEL ADJUSTMENT-2
1. Receive colour bar pattern.
2. Connect oscilloscope to terminal 8 of K73A and GND.
Connect oscilloscope to terminal 11 of K73B and GND.
3. Adjust the amplitude of waveforms to be same by
using VR7351.
100% White
"a"
No. 51758
FOCUS ADJUSTMENT
Receive cross-hatch pattern and adjust focus by using
FOCUS VR to obtain the defined vertical and horizontal
lines.
GREY SCALE ADJUSTMENT
SCREEN ADJUSTMENT
1. Select AV1 mode and no signal input.
2. Enter to the service mode and select mode
"REGULAR", item "REGULAR 4SCR".
3. Check that mode is switched to AV and no signal
inputs.
4. Turn the SCREEN VR to set data value to be "11".
GREY SCALE ADJUSTMENT
5. Enter to the service mode and select mode
"REGULAR", item "REGULAR 5GRY".
6. Adjust [R-Drive] and [B-Drive] control to obtain proper
white balance by using
a) Select [R-Drive] or [B-Drive] by using the
button.
b) Adjust [R-Drive] or [B-Drive] by using the
button.
STATUS
REGULAR
4GRY
*The cut off adjustment is not required for this model. The
cut off adjustment is carried out automatically in the TV
set itself.
AV-28BK5ECB
AV-28BK5ECS
or
button.
or
or
[R-Drive]
22
22
[B-Drive]
Adjustable Range:
00 ~ 3F, 4F ~ 7F, 80 ~ BF, C0 ~ FF
15
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