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No. 51940
AV-27D303
AV-27D203
21
■
ADJUSTMENTS
B1 POWER SUPPLY
Item
Measuring
instrument
Test point
Ad justment part
Description
Check of
B1 POWER
SUPPLY
DC Voltmeter
【
【
【
【
B1
】
】
】
】
Connector
TP-91
TP-E(
#
)
1. Receive the blac k-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 DC134V
±
2V.
ADJUSTMENT OF VCO
Item
Measuring
instrument
Test point
Ad justment part
Description
MAIN VCO
adjustment
Signal
generator
10.VCO MAIN
CW TRANSF.(T111)
[MAIN PWB]
"
It mus t not adjust without signal
1. Select a receivable broadcast.
2. Push the MENU
▼
/
▲
(CH-/+) key, and selec t the 10.VCO
mode from the SERVICE MENU.
3. Push the MENU / (VOL-/+) key, and select MAIN.
4. Confirm that the color change from
「
HIGH LEVEL
」
to
「
LOW
LEVEL
」
by CW TRANSF T111 at MAIN PWB, and check the
「
SYNC : YES
」
.
5. Adjust
until
「
REFFERENCE LEVEL
」
mark turns green.
And then confirm that the
「
SYNC : YES
」
again.
ADJUSTMENT OF RF AGC
Item
Measuring
instrument
Test point
Ad justment part
Description
RF. AGC
adjustment
S45 AGC ADJ
1. Receive a black and white signal (color off).
2. Select
S45 AGC ADJ
of the V/C MODE.
3. Press the MUTING key and turn off c olor.
4. With the MENU (VOL-) key to get the nois e in the screen
picture (zero s ide of s etting value).
5. Press the MENU (VOL+) key s everal times and step when
nois e dis appears from the screen ( at that time, not to increas e
the value too much).
6. Change to other channels and make sure that there Is no
irregularity.
7. Press the MUTING key and get color out.
TUNER MAIN
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC NO
GREEN
No
Setting item
Variable
range
Initial setting
value
S45
AGC ADJ
0
~
127
80
Содержание AV-27D203/R
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