Adjustment Procedure; +B Voltage; Rf Agc; High Voltage - Panasonic TC-21PM30R Service Manual

Item / Preparation

+B Voltage

1. Operate the TV set.
2. Set control as follow :
Brightness ..... minimum
Contrast ........ minimum

RF AGC

1. Receive a colour bar signal at an
RF level of 64(+0-1)dBU with 75
loaded.
2. Connect digital multimeter to RF AGC
at Tuner.

High Voltage

1. Receive the crosshatch pattern.
2. Set to 0 Beam .
Screen VR ..... minimum
Contrast ....... minimum
Item / Preparation
Connect oscilloscope probe to TPA32
(R-OUT) with 10Kohm series resistor.
Connect a short jumper between TPA 10
and TPA 20.
Press Main Menu and Set system to
Use AV-NTSC (3.58MHz).
DYNAMIC ....... Normal

Adjustment Procedure

Confirm the DC voltage at the indicated test points,
as follow :
TPA 12 : 141.2 +- 0.8V
TPA 11 : 8 +- 1V
TPA 10 : 5 +- 1V
1. Select "RF AGC" indication in CHK 2, on Screen
by remote control at factory mode.
2. Set RF AGC by using remote control volume (+)
or volume (-) button until voltage AGC at Tuner
reach 2.7 +- 0.1V.
3. Increase RF signal strenght by 2dB, confirm
AGC at Tuner voltage drop.
1. Connect a DC voltage meter to TPA 12
and confirm the +B voltage is 141.2 +- 0.8V.
2. Connect a high frequency voltmeter to heater and
confirm that voltage reads 6.3+- 0.24 (VRMS).
3. Normalize the brightness and contrast.
1. Adjust Sub-Tint so that No.2,3 and 4 becomes
level waveform is similiar to Fig. 10.
2. Confirm phase at Tint is changes more than
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.
Adjustment Procedure
Adjustment Produre
+/- 30 by Tint control.
a
0.5a
1 2 3 4 5 6
Fig. 10
TPA 21 : 215 +- 15V
7 8 9 10