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AV-20320
AV-20321
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item
instrument
Check of
DC Voltmeter TP-91 (B1)
B1 POWER
SUPPLY
ADJUSTMENT OF VIDEO / DEF. CIRCUIT
Measuring
Item
instrument
IF VCO
Signal
adjustment
generator
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
SYNC
:
RF. AGC
adjustment
FOCUS
Signal
adjustment
generator
18
Test point
Adjustment part
TP-E(
)
Test point
Adjustment part
CW TRANSF. (T131)
[VCO(CW)] MODE
YELLOW
YES
EXIT BY
EXIT
No.19 RF AGC
FOCUS VR
[In HVT]
1. Receive a black-and-white signal.
2. Connect the DC Voltmeter to TP-91 (B1) and TP-E(
page of Adjustment Locations)
3. Confirm that the voltage is DC134V
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 the color change (yellow) from
TOO LOW
by CW TRANSF. and
shown on the screen. Then, adjust CW TRANSF. until
BELOW REFERENCE
again
SYNC : YES
1. Receive a broadcast.
2. Select "No.19 RF AGC" of the PICTURE MODE.
3. Press the MUTE 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 MUTE key and get color out.
1. Receive a crosshatch signal.
2. While looking at the screen, adjust FOCUS VR so that 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.
No. 51964
Description
)(See the
+2V
-2.5V.
Description
TOO HIGH
SYNC : YES
mark turns yellow and confirm
being shown on the screen.
to
being
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