JVC AV-36D501 Service Manual page 23

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ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item
instrument
Check of DC Voltmeter
B1 POWER
SUPPLY Signal
generator
ADJUSTMENT OF IF. VCO
Measuring
Item
instrument
Remote
IF VCO
adjustment
control unit
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC : YES
ADJUSTMENT OF RF AGC
Measuring
Item
instrument
RF. AGC Remote
adjustment
control unit
ADJUSTMENT OF FOCUS
Measuring
Item
instrument
FOCUS Signal
adjustment
generator
Test point Adjustment part
B1 ( " " " " B1 # # # #
Connector
" 1 # " " " # pin) # #
(TP-91)
TP-E(#)
( " " B1 # " " # # #
Connector
" 3 # " " " # pin) # #
Test point Adjustment part
CW TRANSF.
[IF PWB]
YELLOW
Test point Adjustment part
No.55 AGC ADJ
Test point Adjustment part
FOCUS VR
[built-in HVT]
No. 51686
Description
1. Input the black and white signal (color off).
2. Connect the DC voltmeter to " B1 # connector " 1 # pin (TP-91)
and TP-E( # ) (B1 connector " 3 # pin).
3. Confirm that the voltage is DC134V  2V.
Description
" Under normal conditions, no adjustment is required.
And it must not adjust without signal.
1. Receive the NTSC broadcast. (Use channels without offset
frequency).
2. Select the VCO (CW) mode from the SERVICE MENU.
3. Confirm that the color change from HIGH LEVEL to LOW
LEVEL by CW transf., and check the SYNC : YES .
4. Adjust until REFFERENCE LEVEL mark turns yellow.
And then confirm that the SYNC : YES again.
Description
1. Receive the broadcast.
2. Select No.55 AGC ADJ of the PICTURE MODE.
3. Press the MUTING key and turn off color.
4. With the MENU LEFT key, let down the value to appear the
noise on the screen picture.
5. Then increase the value not to see the noise on the screen ( at
that time, not to increase the value too much).
6. Change to other channels and make sure that there is no
irregularity.
7. Press the MUTING key and get color on.
Description
1. Input the cross-hatch signal.
2. While looking at the screen, adjust the FOCUS VR to 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.
AV-27D201
AV-32D201
21