Model 201C Section V
Table 5-5. Troubleshootinr Chart
CHECK OR SYMPTOM POSSIBLE CAUSE REMEDY
1. POWER SUPPLY
Measure +310 VDC (at 115 Vline) between pin 8,
V6 and chassis.
Voltage low Defective V6 Replace
Measure power supply ripple at pin 4 of V4 or VS.
Ripple in excess of .25 vac. Defective fdter Replace
capacitor C12B or C
Defective V6 Replace
Measure ripple at junction R28 and C12A.
Ripple in excess of 0.01 vac. Defective C12A Replace
2. OSCILLATOR
Measure oscillator hum between negative terminal
of C8 and chassis. Remove lamp RT11 to eliminate
oscillator signal.
Hum in excess of 0.02 vac Defective V1 or V2 Replace.
Replace lamp and measure oscillator voltage be-
tween negative terminal of C8 and chassis (see
Figure 5-5).
Oscillator voltage not within range indicated on Defective lamp RTll Replace lamp (See Paragraph
schematic. 5-37).
R10 out of adjustment. Adjust R10 for proper
Defective V1 or V2. oscillator voltage or
replace V1 or V2.
Dirty contacts on Check and clean RANGE
RANGE switch switch. Replace assembly
when resistors are open
or damaged. See Para-
graph 5-39.
Shorted C1, C2, C3, Replace defective trim.
or c4. mers (C2, C3, or C4).
Foreign material may
short C1.
Excessively high OSC voltage Defective lamp RTll Replace lamp (See Paragraph
(Notch will appear 5-37).
in oscillator output
waveform viewed on
oscilloscope .)
Measure distortion between negative terminal of
C8 and chassis.
If it exceeds .5% at 1 watt and 1000 Hz Defective VI or V2 Replace (See Paragraph 5-35).
Defective lamp, RTll Replace lamp.
5-5 |
ACEC
HEWLETT-PACKARD
