JVC AV-21F1P, Руководство по обслуживанию

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AV-21F1P
No. 56033 16
ADJUSTMENTS
B1 POWER SUPPLY CHECK
Description
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.
Measuring
Item Test point Adjustment part
instrument
Adjustment Signal FOCUS VR
of FOCUS generator [In HVT]
FOCUS ADJUSTMENT
Description
1. Receive a black and white signal (color off). (NTSC)
2. Connect a DC voltmeter between B1 (TP-91) and TP-E (
"
)
(between pins 1 and 3 of the connector B1).
3. Make sure that the voltage is DC134.5
±
2.0V.
Measuring
Item Test point Adjustment part
instrument
Check of
●
Signal B1 (TP-91)
B1 POWER Generator TP-E (
" " " " "
)
SUPPLY
●
DC [B1
voltmeter connector]
Measuring
Item Test point Adjustment part
instrument
Adjustment
●
Signal CW TRANSF.
VCO (CW) Generator (T111)
●
Remote
control unit [MAIN PWB]
Description
●
Under normal conditions, no adjustment is required.
1. Receive any broadcast. (Use a channel without offset fre-
quency.)
2. Select the sub menu screen VCO (CW) from the SERVICE
MENU. (More specifically, in the SERVICE MENU, press the
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
in yellow as you turn the CW TRANSF. At this time, check that
"SYNC: YES" appears on the screen.
4. Slowly turn the CW TRANSF. until "BELOW REFERENCE"
changes to yellow. Also, at this time, check that "SYNC: YES"
appears on the screen.
5. Press the EXIT key to return to the normal screen.
IF VCO ADJUSTMENT
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
SYNC : YES
EXIT BY
IT
EXIT
SUB MENU: VCO (CW)
YELLOW
Description
1. Receive any broadcast.
2. 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.
Measuring
Item Test point Adjustment part
instrument
Adjustment Remote 60. RF AGC
of RF AGC control unit
RF AGC ADJUSTMENT
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