JVC AV-T2122 Service Manual page 12

AV-T2122
■ ■ ■ ■ ADJUSTMENTS
! ! ! ! B1 POWER SUPPLY
Measuring
Item
instrument
Check of
DC Voltmeter B1 (
B1 POWER
SUPPLY
IF VCO ADJUSTMENT
Measuring
Item
instrument
Signal
IF VCO
generator
adjustment
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
SYNC : YES
RF AGC ADJUSTMENT
RF AGC
adjustment
FOCUS ADJUSTMENT
FOCUS Signal
adjustment generator
18
Test point Adjustment item
B1
Connector
pin)
1
(TP-91)
TP-E(#)
(
B1
Connector
pin)
3
Test point Adjustment item
CW TRANSF. (T111)
[VCO (CW)] mode
YELLOW
EXIT BY
EXIT
IT
No.60 RF AGC
FOCUS VR
[In HVT]
1. Receive a black and white signal (color off). (NTSC)
2. Connect the DC voltmeter to B1
and TP-E( # ) (B1 connector 3 pin).
3. Confirm that the voltage is DC134.5V ± 2V.
" Under normal conditions, no adjustment is required.
1. Receive a broadcast. (use channels without offset frequency).
2. Select the VCO(CW) mode from the SERVICE MENU.
3. Confirm the color change (yellow) from " TOO HIGH " to
" TOO LOW " by CW TRANSF. and " SYNC : YES " being
shown on the screen. Then, adjust CW TRANSF. until
" BELOW REFERENCE " mark turns yellow and confirm
again " SYNC : YES " being shown on the screen.
1. Receive a broadcast.
2. Select "No.60 RF AGC" of the PICTURE mode in SERVICE
MENU.
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.51866
Description
connector 1 pin (TP-91)
Description