|
Item / Preparation
|
|
|
|
Adjustment Procedure
|
|
|
+B Voltage
|
|
Confirm the DC voltage at the indicated test points, as follows :
|
|
|
|
1.
|
Operate the TV set.
|
|
|
|
TPA 12 : 140.5 ± 1.5V
|
|
|
|
2.
|
Set control as follows :
|
|
|
|
TPA 11 : 8 ± 1V
|
|
|
|
|
Brightness ...........minimum
|
|
|
|
TPA 10 : 5 ± 1V
|
|
|
|
|
Contrast .............. minimum
|
|
|
|
TPA 21 : 215 ± 15V
|
|
|
RF AGC
|
|
|
|
|
|
|
1.
|
Receive a colour bar signal at an RF level of 75 ± 1-2 dBU with 75Ω loaded.
|
|
|
1.
|
Select “RF AGC” indication in CHK2, on Screen by remote control at factory mode.
|
|
|
|
2.
|
Connect digital multimeter to RF AGC at Tuner.
|
|
|
2.
|
Set RF AGC by using remote control Volume (+) or Volume (-) button until voltage AGC at Tuner reaches 2.6 ± 0.1V at TPA 15 (Tuner point).
|
|
|
|
|
|
|
|
3.
|
Increase RF signal strength by 2dB, confirm AGC at Tuner voltage drop.
|
|
|
High Voltage
|
|
|
|
|
|
|
1.
|
Receive the crosshatch pattern.
|
|
|
1.
|
Connect a DC voltage meter to TPA 20 and confirm the +B voltage is 140.5 ± 1.5V.
|
|
|
|
2.
|
Set to 0 Beam.
|
|
|
|
|
|
|
|
Screen VR .......... minimum
|
|
|
2.
|
Connect a high frequency voltmeter to heater and confirm that voltage reads 6.0 ± 0.24 (VRMS).
|
|
|
|
|
Contrast .............. minimum
|
|
|
|
|
|
|
|
|
|
|
3.
|
Normalize the brightness and contrast.
|
|
|
|
|
|
|
|
|
|
|
|
Item / Preparation
|
|
|
|
Adjustment Procedure
|
|
|
NTSC TINT COLOUR
|
|
|
|
|
|
|
Connect a short jumper between TPA 10 and TPA 20.
Press Main Menu and set system to use AV-NTSC (3.58 MHz).
DYNAMIC ................. Normal
ChannelCLR Set ..... STD
|
|
|
1.
|
Adjust Sub-Tint so that No. 2, 3 and 4 becomes level waveform is similar to Fig. 3.
|
|
|
|
|
|
2.
|
Confirm phase at Tint is changes more than ± 30 by Tint control.
|
|
|
|
|
|
3.
|
Confirm that colour level is maximum when colour DAC is adjusted to maximum position.
|
|
|
|
|
|
|
Note: Use remote control only when adjusting user mode to Sub-Tint.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Fig. 3
|
|