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AV-21PM
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item
instrument
Check of
Signal
B1 POWER
Generator
SUPPLY
DC
Voltmeter
FOCUS ADJUSTMENT
Measuring
Item
instrument
Adjustment
Signal
of FOCUS
generator
IF CIRCUIT ADJUSTMENT
Measuring
Item
instrument
Adjustment
Remote
of VCO (CW) control unit
VCO (CW)
TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST
VCO ADJUST
FINE
14
Test point
Adjustment part
TP-91 (B1)
TP-E (" " " " " )
[S1
connector]
Test point
Adjustment part
FOCUS VR
[In HVT]
Test point
Adjustment part
VCO (CW)
fv
.
MHz
YELLOW
Do not adjust.
DISP : EXIT
1. Receive a whole black signal.
2. Connect a DC voltmeter between TP-91 (B1) and TP-E (")
(between pins 1 and 5 of the connector S1).
3. Make sure that the voltage is DC135.0
1. Receive a cross-hatch signal.
2. While watching the screen, adjust the FOCUS VR to make the
vertical and horizontal lines as fine and sharp as possible.
3. Make sure that, when the screen is darkened, the lines remain
in good focus.
Under normal conditions, no adjustment is required.
Note: Do not adjust without inputting signal.
1. Receive a colour bar signal.
2. Select 1. IF from the SERVICE MENU.
3. Press the 1 key to select 1. VCO.
4. Select VCO ADJUST with the MENU a key and make sure
that the setup value shown in the screen is +00.
5. Press the MENU − or + key until the colour of the characters
"TOO HIGH" displayed on the screen changes from blue to
yellow.
6. Press the MENU − or + key until the colour of the characters
"TOO LOW" displayed on the screen changes from blue to
yellow. At this time, check that the value of VCO ADJUST on
the screen is +00 or about +00.
7. Select AFT ADJUST with the MENU a key.
8. Then, press the MENU − or + key until the colour of the char-
acters "JUST REFERENCE" displayed on the screen changes
from blue to yellow.
9. Press the DISPLAY key three times to return to normal screen.
No. 56055
Description
±
1.5V.
Description
Description
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