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AV-27GFH
■ ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item
instrument
Check of
DC Voltmeter B1 (【 【 【 【 B1】 】 】 】
B1 POWER
SUPPLY
ADJUSTMENT OF IF. VCO
Measuring
Item
instrument
IF VCO
Signal
adjustment
generator
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC
: YES
ADJUSTMENT OF RF AGC
Measuring
Item
instrument
RF. AGC
adjustment
22
Test point
Adjustment part
Connector
【 【 【 【 1】 】 】 】 pin)
(TP-91)
TP-E(#)
(【 【 【 【 B1】 】 】 】
Connector
【 【 【 【 3】 】 】 】 pin)
Test point
Adjustment part
CW TRANSF. (T131)
[VCO(CW)] MODE
Test point
Adjustment part
No.19 RF AGC
No. 51806
Description
1. Receive a black-and-white signal. (Color off)
2. Connect the DC Voltmeter to 【 B1 】 connector 【 1 】 pin (TP-91)
and TP-E( # ) (B1 connector 【 3 】 pin).
3. Confirm that the voltage is DC134.5V ± 2V.
Description
" Under normal conditions, no adjustment is required.
1. Receive a NTSC broadcast. (Use channels without offset
frequency).
2. Select the VCO (CW) mode from the SERVICE MENU.
3. Confirm that the color change from 「 HIGH LEVEL 」 to 「 LOW
LEVEL 」 by CW trans. and check the 「 SYNC : YES 」 .
4. Adjust until 「 REFERENCE LEVEL 」 mark turns yellow.
and then confirm that the 「 SYNC : YES 」 again.
Description
1. Receive a broadcast.
2. Select "No.19 RF AGC" of the PICTURE MODE.
3. Press the MUTING key and turn off color.
4. With the MENU LEFT key, get noise in the screen picture.
(0 side of setting value)
5. Press the MENU RIGHT key and stop when noise disappears
from the screen.
6. Change to other channels and make sure that there is no
irregularity.
7. Press the MUTING key and get color out.
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