AV-20D304
(No.52103)1-17
3.6 ADJUSTMENTS PROCEDURE
3.6.1 CHECK ITEM
3.6.2 VCO
3.6.3 RF AGC
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 POWER
SUPPLY
DC voltmeter
Signal
generator
B1 Connector
TP-91
TP-E
[MAIN PWB]
(1) Receive the black and white signal. (color off)
(2) Connect the DC voltmeter to TP-91 (B1 connector 1
pin) and TP-E (B1 connector 3 pin).
(3) Confirm that the voltage is DC134V±2V.
Item
Measuring
instrument
Test point
Adjustment part
Description
IF VCO
Remote
control unit
[9.VCO]
CW transf. (T111)
[MAIN PWB]
• It must not adjust without inputting the RF signal.
(1) Receive a broadcast.
(2) Select 9.VCO in the SERVICE MENU.
(3) Confirm that the color change from "TOO HIGH" to
"TOO LOW" by CW transf. on MAIN PWB, and
check the "SYNC : YES".
(4) Adjust CW transf. until "GOOD" letters turns green.
And then confirm that the "SYNC : YES" again.
Adjustment can be done in this statement.
(5) Push the [EXIT] key to exit the [9.VCO] mode.
TOO HIGH GOOD TOO LOW
SYNC: YES
AFC ON
FINE 0
Item
Measuring
instrument
Test point
Adjustment part
Description
RF AGC
Signal
generator
Remote
control unit
[1.V/C(S)]
S21 : AGC ADJ
(1) Receive a black and white signal (colour off).
(2) Select <S21>(AGC ADJ) of the 1.V/C(S).
(3) Press the [MUTING] key and turn the picture color
off.
(4) With the [VOLUME (-)] key to get the noise in the
screen picture (zero side of setting value).
(5) Press the [VOLUME (+)] key several times and step
when noise disappears from the screen (at that time,
not to increase 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.
No
S21
Setting item
AGC ADJ
0~127
Variable
range
Initial setting
value
80
Содержание AV-20D304/SA
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