Service manual

5. Use a variac to slowly increase the AC power. Measure over sensing resistors
R3514/15, to confirm a nice sawtooth voltage becomes available. Also measure
the VBAT output.
6. VBAT may never exceed 141V. If so, there is something wrong in the feedback
circuitry (e.g., regulator 7506).
Caution:
Be careful measuring the gate of FET 7504. Circuitry is very high impedance and can
easily be damaged (first connect ground to measuring equipment, then measure the
gate).
Do not try to measure on side of SSB directed to the hot heatsink. This is dangerous.
Most relevant service test points are guided to the Tuner side and are pointed out by
service printing. Where the circuitry was too crowded to place this service printing, it has
been explained on the Test Point Overviews in this manual. It is also possible to use the
SSB extension panel (part number: 9965 000 05769), so that all test points are easily
accessible.
Standby Power Supply
The simplest way to replace components of the Standby supply is with repair kit: 3122
785 90350.
Horizontal Deflection
The simplest way to replace components of the Horizontal Deflection circuitry is with
repair kit: 3122 785 90120.