AV-21F1P
ADJUSTMENTS
B1 POWER SUPPLY CHECK
Measuring
Item Test point Adjustment partDescription
instrument
Check ofl SignalB1 (TP-91)1. Receive a black and white signal (color off). (NTSC)
B1 POWERGeneratorTP-E """""()2. Connect a DC voltmeter between B1 (TP-91) and ") TP-E (
SUPPLYl DC[B1(between pins 1 and 3 of the connector B1).
voltmeterconnector]3. Make sure that the voltage is DC134.5 ? 2.0V.
IF VCO ADJUSTMENT
Measuring
Item Test point Adjustment partDescription
instrument
Adjustment l SignalCW TRANSF.l Under normal conditions, no adjustment is required.
VCO (CW)Generator(T111)1. Receive any broadcast. (Use a channel without offset fre-
l Remotequency.)
control unit[MAIN PWB]2. Select the sub menu screen VCO (CW) from the SERVICE
MENU. (More specifically, in the SERVICE MENU, press the
SUB MENU: VCO (CW)
MENU 1/4 key to select VCO (CW) and then press the MENU
2/3 key to enter the sub menu screen VCO (CW) .)
3. Confirm that the color of "TOO HIGH" and "TOO LOW" changes
TOO HIGHin yellow as you turn the CW TRANSF . At this time, check that
ABOVE REFERENCE
BELOW REFERENCEYELLOW"SYNC: YES" appears on the screen.
TOO LOW
4. Slowly turn the CW TRANSF. until "BELOW REFERENCE"
SYNC : YESchanges to yellow. Also, at this time, check that "SYNC: YES"
EXIT BY
EXITappears on the screen.IT
5. Press the EXIT key to return to the normal screen.
RF AGC ADJUSTMENT
Measuring
Item Test point Adjustment partDescription
instrument
Adjustment Remote60. RF AGC1. Receive any broadcast.
of RF AGCcontrol unit2. Select the sub menu screen PICTURE from the SERVICE
MENU.
3. Select 60. RF AGC with the MENU 1/4 key.
4. Press the MUTING key to turn off the color.
5. Press the MENU 2 key to get noise on the screen picture. (The
setting value will be decreased.)
6. Press the MENU 3 key until noise disappears from the screen.
7. Change to other channels and make sure that there is no ir-
regularity on the screen picture.
8. Press the MUTING key to turn on the color.
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.
No. 5603316 |
ACEC
