JVC AV-27F802 Service Manual page 24

AV-27F802
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item
instrument
Check of DC Voltmeter R507 C504
B1 POWER
SUPPLY
ADJUSTMENT OF RF AGC
Measuring
Item
instrument
RF AGC
adjustment
ADJUSTMENT OF FOCUS
Measuring
Item
instrument
Signal
FOCUS
generator
adjustment
24
Test point Adjustment part
side (B1)
Q511
heatsink ( )
Test point Adjustment part
No.59 RF AGC
Test point Adjustment part
FOCUS VR
[In HVT]
H VR
[In HVT]
No. 51757
Description
1. Receive a black-and-white signal.
2. Connect the DC Voltmeter to R507 C504 side (B1) and Q511 heatsink
( ).
3. Confirm that the voltage is DC134V
Description
1. Receive a broadcast.
2. Select the No.19 RF AGC of the PICTURE MODE.
3. Press the MUTE key of the remote control unit and turn off color.
4. With the LEFT key of the remote control unit, get noise in the screen
picture. (0 side of setting value)
5. Press the RIGHT key of the remote control unit and stop when noise
disappears from the screen.
6. Change to other channels and make sure that there Is no irregular-
ity.
7. Press the MUTE key and get color out.
Description
1. Receive a crosshatch signal.
2. While looking at the screen center, adjust the FOCUS VR so that
the horizontal lines will be clear and in fine detail.
3. Adjust the H VR so that the vertical lines will be clear and in fine
detail.
4. Make sure that the picture is in focus even when the screen gets
darkened.
Note:
The final adjustment of convergence must be done after the FOCUS
adjustment. (Convergence is changed by FOCUS adjustment.)
+2V
.
-2V