JVC AV-14F13, Service Manual

Page: 20 / 61

No.52021
AV-14F13
AV-14F33
20
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ADJUSTMENTS
B1 POWER SUPPLY
Item
Measuring
instrument
Test point Adjustment item Description
Check of
B1 POWER
SUPPLY DC Voltmeter B1 (
B1
Connector
1
pin)
(TP-91)
TP-E(
#
)
(
B1
Connector
3
pin)
1. Receive a black and white signal (color off). (NTSC)
2. Connect a DC voltmeter to TP-91(B1) and TP-E(
# ).
3. Confirm that the voltage is DC134.5V ± 2V.
IF VCO ADJUSTMENT
Item
Measuring
instrument
Test point Adjustment item Description
" Under normal conditions, no adjustment is required. IF VCO
adjustment Signal
generator CW TRANSF. (T111)
[ VCO (CW) ] mode
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.(T111) and SYNC : YES being shown
on the screen. Then, adjust CW TRANSF.(T111) until BELOW
REFERENCE mark turns yellow and confirm again SYNC :
YES being shown on the screen.
RF AGC ADJUSTMENT
RF AGC
adjustment No.60 RF AGC 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.
FOCUS ADJUSTMENT
FOCUS
adjustment Signal
generator FOCUS VR
[ In HVT ] 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.
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
SYNC : YES
EXIT BY
IT
EXIT
YELLOW
No. Setting item
Variable
range
Initial setting
value
60 RF AGC
000 ～ 255
183