Adjustment For Crt Cut Off; Adjustment Procedure - Panasonic TX-29RX20M-MALAYSIA Service Manual

4.3.

Adjustment for CRT CUT OFF

Preparation:
1. Connect the oscilloscope probe to (GREEN CATHODE) on L Board.
2. Screen VR min.
3. Set the data Sub Bright, Bright.
4. In service Mode at "Bright" dac press [5] in factory mode to enter vertical line and adjust by volume down or up button.
5. Adjust "Screen VR" to set voltage as in Table 1.
4.4.

Adjustment Procedure

4.4.1. +B Voltage
Item / preparation
1. Operate the TV set.
2. Set control as follows :
Brightness ........... minimum
Contrast ............... minimum
Adjustment procedure
1. Confirm the DC voltage at the indicated test points, as follows :
TPA 15 : 3.35 V ± 0.2
TPA 16 : 141 V ± 2
TPA 17 : 8.2 V ± 0.35
TPA 18 : 1.85 V ± 0.15
TPA19 : 5.30 V ± 0.2
TPA20 : 220 V ± 15
4.4.2. High Voltage
Item / preparation
1. Receive the crosshatch pattern.
2. Set to 0 Beam.
Screen VR .......... minimum
Contrast .............. minimum
Adjustment procedure
1. Connect a DC voltage meter to TPA 16 and confirm that the +B voltage is 141.0 V ± 2.
2. Connect a high frequency voltmeter to heater and confirm that voltage reads 6.3 V (RMS) ± 0.3.
3. Normalize the brightness and contrast.
9
TX-29RX20M-MALAYSIA