Magnum PF21500 Service Manual - page 7
•Power on the specific degausser and face it to the TV screen.
•Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.
•Repeat the above steps until the TV is degaussed completely.
2.2.2 Confirmation and Adjustment for Voltage
Caution:
+B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to the rated
value. The maximal radiator is not GND by reason of linking to TP--12V.
•Make sure that the supply voltage is within the range of the rated value.
•Connect a digital voltmeter to the voltage output terminal of the main PCB. Power on the TV and set the
brightness and sub-brightness to minimum. Ensure that the voltage from the main PCB reads as follows.
•Regulate voltage adjustment components on the power section until the +B the voltage reaches the rated
value.
Test Point
Voltage
(21SS)
Voltage
(21US)
Voltage
(Others)
TP-310V
311
土
5V 311
土
5V 311
土
5V
TP-103V
104
土
1.5V
104
土
1.5V 115
土
1.5V
TP-184V
184
土
3V 184
土
3V 184
土
3V
TP-+12V
13
土
1V 16
土
1V 13
土
1V
TP--12V
-
13
土
1V -16
土
1V
-
13
土
1V
TP-22V
22
土
1V 22
土
1V 22
土
1V
TP-35V
35
土
1V 35
土
1V 35
土
1V
TP-36V
36
土
1V 36
土
1V 36
土
1V
TP-5V-1
5
土
0.3V 5
土
0.3V 5
土
0.3V
TP-8V
8
土
0.3V 8
土
0.3V 8
土
0.3V
TP-5V-2V
5
土
0.3V 5
土
0.3V 5
土
0.3V
TP-3.3V
3.3
土
0.3V 3.3
土
0.3V 3.3
土
0.3V
Note:
It’s impossible to check the power part separately from the main chassis board as the part is mounted on
the main chassis board. The power components, etc. should be checked for burnout when power-on. If
burned out, do not power on the TV again until the cause is found out.
2.2.3 High Voltage Inspection
Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high voltage
with the high-voltage testing equipment and heater voltage with the high-frequency effective voltmeter. The
rated values are shown as below.
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