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AV-35750
AV-35770
Mi ADJUSTMENTS
B1 VOLTAGE CHECK
Measuring
:
.
Test point
Adjustment part
Description
instrument
B1 voltage
Dc
B1 ( [Bi]
. Receive a monoscope pattern
ee
ne
check
Voltmeter
Connector
. Connect the DC voltmeter to [B1]
[B1] connector fr] pin (TP-91)
[1] pin)
and TP-E (74) (B1 connector [3 |
[3] pin).
'
(TP-91)
. Confirm that the voltage is DC 136V +3V.
TP-E(x4-)((B1]
Connector[3]
pin)
ADJUSTMENT OF IF. VCO
Measurin
2
Adjustment part
Description
instrument
IF VCO
Oscillo-
CW TRANSF.
. Receive the color bar signal.
adjustment
scope
Ge
so
(T7131)
. Connect the oscilloscope to pin [3]or the
connecior.
pin
. Select the [RF AFC 1] MODE of the SERVICE
MENU. Set
Signal
[RF AFC 1] MODE
the RF AFC to OFF and FINE to +00.
generator
. Turn T131, verify that the AFC output voltage changes quickly
between
2.5V+1.5V
and
then
adjust
the
voltage
to
2.5V +0.2V.
. Return the RF AFC to ON.
. Cancel the service menu and check that no irregularities are
displayed on the screen.lf there any irregularities, select [RF
AFC 1] MODE on the service menu and verify that FINE is 00
when the AFC is ON. Repeat steps 3 to 5 if necessary.
AFC setting
The variation
voltage :
must be greater
2.5V +0.2V
then2.5V + 1.5V
ADJUSTMENT
OF RF AGC
RF.AGC
No.19 RF AGC
. Receive a broadcast.
adjustment
. Select "No.19 RF AGC" of the PICTURE MODE.
. Press the MUTE key and turn off color.
. With the MENU
LEFT key, get noise in the screen picture. (0
side of setting value)
. Press the MENU RIGHT key and stop when noise disappears
from the screen.
. Change
to other channels
and make
sure that there
is no
irregularity.
. Press the MUTE key and get color out.
ADJUSTMENT
OF FOCUS
FOCUS
Signal
FOCUS VR
. Receive a crosshatch signal.
adjustment
generator
[built-in HVT]
. While looking at the screen, adjust FOCUS
VR
so that the
vertical and horizontal lines will be clear and in fine detail.
. Make sure that the picture is in focus even when the screen
gets darkened.
8 (No.51130)
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