No. 51806
AV-27GFH
22
■
ADJUSTMENTS
B1 POWER SUPPLY
Item
Measuring
instrument
Test point
Adjustment part
Description
Check of
B1 POWER
SUPPLY
DC Voltmeter B1 (
【
【
【
【
B1
】
】
】
】
Connector
【
【
【
【
1
】
】
】
】
pin)
(TP-91)
TP-E(
#
)
(
【
【
【
【
B1
】
】
】
】
Connector
【
【
【
【
3
】
】
】
】
pin)
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.
ADJUSTMENT OF IF. VCO
Item
Measuring
instrument
Test point
Adjustment part
Description
IF VCO
adjustment
Signal
generator
CW TRANSF. (T131)
[VCO(CW)] MODE
"
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.
ADJUSTMENT OF RF AGC
Item
Measuring
instrument
Test point
Adjustment part
Description
RF. AGC
adjustment
No.19 RF AGC
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.
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC : YES
Содержание AV 32120
Страница 44: ...AV 27GFH AV 27GFH No 51806 No 51806 TP 91 B1 TP E FRONT 2 11 2 12 PATTERN DIAGRAMS MAIN PWB PATTERN ...
Страница 45: ...AV 27GFH AV 27GFH No 51806 No 51806 TOP 2 13 2 14 AV SELECTOR PWB PATTERN ...
Страница 47: ...AV 27GFH AV 27GFH No 51806 No 51806 2 17 2 18 VP0106 DP6051 ...
Страница 59: ...No 51806 AV 27GFH 43 ...