AV-21PM
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item Test point Adjustment partDescription
instrument
Check ofl SignalTP-91 (B1)1. Receive a whole black signal.
B1 POWERGeneratorTP-E """""()2. Connect a DC voltmeter between TP-91 (B1) and ") TP-E (
SUPPLYl DC[S1(between pins 1 and 5 of the connector S1).
Voltmeterconnector]3. Make sure that the voltage is DC135.0 ? 1.5V.
FOCUS ADJUSTMENT
Measuring
Item Test point Adjustment partDescription
instrument
Adjustment SignalFOCUS VR1. Receive a cross-hatch signal.
of FOCUSgenerator[In HVT]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.
IF CIRCUIT ADJUSTMENT
Measuring
Item Test point Adjustment partDescription
instrument
Adjustment RemoteVCO (CW)l Under normal conditions, no adjustment is required.
of VCO (CW) control unitNote: 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.
fvVCO (CW) ]]].]] MHz
5. Press the MENU - or + key until the colour of the characters
TOO HIGH
"TOO HIGH" displayed on the screen changes from blue to
ABOVE REFERENCE
JUST REFERENCEYELLOWyellow.
BELOW REFERENCE6. Press the MENU - or + key until the colour of the characters
TOO LOW
AFT ADJUST ]]]"TOO LOW" displayed on the screen changes from blue to
VCO ADJUST ]]]yellow. At this time, check that the value of VCO ADJUST on
FINEDo not adjust.
DISP : EXITthe 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. 5605514 |
ACEC
JVC
