2.5. Adjustment Procedure
Item / Preparation
Adjustment Procedure
+B Voltage
Confirm the DC voltage at the indicated test points, as follows :
1. Operate the TV set.
TPA 10 : 140.5 ± 1.5V
2. Set control as follows :
TPA 8 : 8 ± 1V
Brightness ...........minim um
TPA 9 : 5 ± 1V
Contrast .............. minimum
TPA 21 : 175 ± 15V
RF AGC
1. Receive a colour bar signal at an RF level of 69 ±
1-2 dBU with 75
Ω
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 6.3
± 0.48 (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
Channel CLR 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
7
TC-21PM70R
Summary of Contents for TC-21PM70R
Page 4: ...1 5 GP3 Chassis Block Diagram 4 TC 21PM70R ...
Page 12: ...3 Conductor Views 12 TC 21PM70R ...
Page 13: ...4 Schematic Diagram 13 TC 21PM70R ...
Page 14: ...14 TC 21PM70R ...
Page 17: ...4 1 3 A BOARD 3 4 1B 1C 2C 3C 4C 5C 6C 2B 3B 4B 5B 6B 7B 8B 9B 10B 11B 12B 17 TC 21PM70R ...
Page 18: ...4 1 4 A BOARD 4 4 1C 2C 3C 4C 5C 6C 18 TC 21PM70R ...
Page 19: ...4 2 L BOARD 4 2 1 L BOARD 1 2 1A 2A 3A 4A 5A 6A 7A 19 TC 21PM70R ...
Page 20: ...4 2 2 L BOARD 2 2 1A 2A 3A 4A 5A 6A 7A 20 TC 21PM70R ...
Page 21: ...5 Parts Location 21 TC 21PM70R ...