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AV-27D104 AV-27D304
AV-27430 AV-27432
3.6 ADJUSTMENT PROCEDURE
3.6.1 CHECK ITEM
Measuring
Item
instrument
B1 POWER
DC voltmeter
SUPPLY
Signal
generator
3.6.2 VCO
Measuring
Item
instrument
IF VCO
Remote
control unit
3.6.3 RF AGC
Measuring
Item
instrument
RF AGC
Signal
generator
Remote
control unit
No.
Setting item
S21
AGC ADJ
3.6.4 ADJUSTMENT OF FOCUS
Measuring
Item
instrument
FOCUS
Signal
generator
1-18 (No.52102)
Test point
Adjustment part
B1 Connector
1-pin : TP-91
3-pin : TP-E
[MAIN PWB]
Test point
Adjustment part
[9.VCO]
CW transf. (T111)
[MAIN PWB]
TOO HIGH
GOOD
TOO LOW
SYNC:
YES
AFC
ON
FINE
0
Test point
Adjustment part
[1.V/C(S)]
S21 : AGC ADJ
Variable
Initial setting
range
value
0 127
Test point
Adjustment part
FOCUS VR
[In HVT]
(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
• It must not adjust without inputting the RF signal.
(1) Receive a broadcast.
(2) Select 9.VCO mode from the SERVICE MENU.
(3) Change the [AFC] to OFF and [FINE] to 0.
(4) Confirm that the color change from "TOO HIGH" to
"TOO LOW" by CW transf. on MAIN PWB, and
check the [SYNC] is YES.
(5) Adjust CW transf. until "GOOD" letters turns green.
And then confirm that the [SYNC] is YES again.
Adjustment can be done in this statement.
(6) It return the [AFC] to ON.
(7) Push the [EXIT] key to exit the [9.VCO] mode.
(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.
80
(7) Press the [MUTING] key and get color out.
(1) Receive the crosshatch signal.
(2) While looking at the screen, adjust the FOCUS VR
to the vertical and horizontal lines will be clear and in
fine detail.
(3) Make sure that the picture is in focus even when the
screen gets darkened.
Description
±
2V.
Description
Description
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