Agilent Technologies Power Supply Agilent Technologies Power Supply User Manual

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of 27
 
A-9
Low output voltage
(lower than rating)
1. Measure voltage at the
base of Q5.
2. Eliminate current limit
circuit as a source of
trouble by disconnecting
anode of CR11.
3. Measure voltage at pin 3
of U6.
a. Measured voltage is less than 0
volt.
b. Measures voltage is more than 0
volt.
a. Output voltage increases.
b. Output voltage remains low.
a. Measured voltage is near
-0.7V.
b. Measured voltage is zero volt.
c. Measured voltage is near
+0.7V.
a. Check for open Q9, Q6, R26, or
CR5.
b. Proceed to step (2).
a. Check for U6B defective.
b. Reconnect lead and proceed to
step (3).
a. Check for defective U6A.
b. Check for CR14 or CR15 shorted.
c. Check for open R39, shorted R36,
or leaky or shorted C7.
Table A-5. +20V Supply Troubleshooting (Cont’d)
Table A-6. -20V Supply Troubleshooting
SYMPTOM STEP - ACTION RESPONSE PROBABLE CAUSE
The +20V supply must operate properly before troubleshooting the -20V supply.
High output voltage
(more than 1%
greater than +20V
supply in fixed
tracking ratio mode)
1. Attempt to turn off Q8 by
shorting emitter-to-base
of Q8.
2. Measure voltage at
base of Q7.
a. Output voltage remains high.
b. Output voltage becomes near zero
volt.
a. Measured voltage is more than
0 volt.
b. Measured voltage is less than
0 volt.
a. Q8 shorted.
b. Remove short and proceed to
step (2).
a. Check for open CR20 or R14 and
check for defective U8A.
b. Check for defective Q7.
Low output voltage
(more than 1% lower
than +20V supply in
fixed tracking ratio
mode)
1. Measure voltage at the
base of Q7.
2. Eliminate current limit
circuit as a source of
trouble by disconnecting
anode of CR18.
3. Measure voltage at pin 3
of U8.
a. Measured voltage is more than 0
volt.
b. Measured voltage is less than
0 volt.
a. Output voltage increases.
b. Output voltage remains low.
a. Measured voltage is near
+0.7V.
b. Measured voltage is zero volt.
c. Measured voltage is near
-0.7V.
a. Check for open Q8, Q3, and R24.
b. Proceed to step (2).
a. Check for U8B defective.
b. Reconnect lead and proceed to
step (3).
a. Check for defective U8A.
b. Check for shorted CR21 and
CR22.
c. Check for open R15, shorted R41,
or leaky or shorted C6.

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