AV-27D502
No. 51797C
23
ADJUSTMENTS
Item
Measuring
instrument
Test point
Adjustment part
Description
Check of
B1 POWER
SUPPLY
DC Voltmeter B1 (pin 1)
GND (pin 3)
[B1 connector
in MAIN PWB]
1. Receive a black-and-white signal.
2. Connect the DC Voltmeter between B1 and GND (between pin 1
and 3 of the B1 connector).
3. Confirm that the voltage is DC134V .
+2V
-2V
RF AGC
adjustment
1. Receive a broadcast.
2. Select the No.59 RF AGC of the PICTURE MODE.
3. Press the MUTE key of the remote control unit to 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.
Item
Measuring
instrument
Test point
Adjustment part
Description
ADJUSTMENT OF RF AGC
FOCUS
adjustment
Signal
generator
Notes:
• Proceed to the following this adjustment after having completed the
adjustments of B1 POWER SUPPLY, SUB BRIGHT and PICTURE.
• Set VIDEO STATUS to “STANDARD”.
• The final adjustment of convergence must be done after the FOCUS
adjustment. (Convergence is changed by FOCUS adjustment.)
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.
FOCUS VR
[In HVT]
H VR
[In HVT]
Item
Measuring
instrument
Test point
Adjustment part
Description
ADJUSTMENT OF FOCUS
B1 POWER SUPPLY
Remote
control unit
TU2 VCO
adjustment
1. Receive a broadcast.
2. Select the TU2 VCO MODE from the SERVICE MENU.
3. Confirm “SYNC” is “YES”.
4. Turn the T111 (CW TRANSF) until “REFERENCE LEVEL” charac-
ters become yellow.
5. Confirm “SYNC” is “YES” again.
Item
Measuring
instrument
Test point
Adjustment part
Description
ADJUSTMENT OF TU2 VCO
Remote
control unit
T111 (CW TRANSF)
[PIP PWB]
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC
:
YES
TU2 VCO
YELLOW