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3. Supply Voltage Adjustment
Caution: +B voltage has close relation to high voltage. To avoid X-ray radiation, +B voltage should be
+145V.
1) Set R801 to the mechanical center and AC power supply to 120±2V.
2) Connect a digital voltmeter to two pins of C838, and then turn on the TV.
3) Receive Philips test pattern signals.
4) Make the voltmeter read 145±0.5V.
4.High Voltage Inspection
Caution: No high voltage adjustment should be done in the chassis.
1) Connect a precise high voltmeter to the second anode of the CRT.
2) Turn on the TV and set the brightness and contrast to minimum (i.e. set beam current of the CRT
to zero).
3) The high voltage tested should be 29±0.5KV(for 25" TV) or 30±0.5KV(for 29" TV)
4) Set the brightness to minimum or maximum, and ensure high voltage not beyond limitation of
30KV (For 25" TV) or 33KV (For 29" TV) in any case.
5. Focus Adjustment
1) Use the remote control to set the contrast to maximum and the brightness, chroma to medium.
2) Set H. V. lines near Philips pattern center to thinnest with the FCB on the FBT. After finishing
adjustment, ensure that no poor focusing exists near the center or around of the frame.
Before Adjusting
SERVICE MANUAL
After Adjusting
35
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