Agilent Technologies Power Supply Agilent Technologies Power Supply User Manual

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A-8
Table A-3. Initial Trobleshooting Procedure
STEP ACTION RESPONSE NEXT ACTION
1 Check output voltage of +20V
supply.
a. Normal
b. Zero volts
c. Output voltage lower or
higher than rating
a. Proceed to step (2).
b. Check ac line fuse (F1). If blown, proceed to "Open Fuse
Troubleshooting" paragraph. If not blown, check bias
and reference voltages (Table A-4).
c. Check bias and reference voltages (Table A-4).
2 Check output voltage of -20V
supply in fixed tracking ratio
mode.
a. Normal
b. High, low, or zero out-
put voltage.
a. If +20V and -20V outputs are both normal with no load, a
supply might be current limiting under load. To check this
adjustment see steps (l) thru (p) on page A-4.
b. Proceed to -20V supply troubleshooting.
3 Check output of +6V supply. a. Normal
b. High, low, or zero out-
put voltage.
a. If the output of this supply is normal unloaded but its volt-
age falls when loaded, check the current limit adjust-
ment, steps (q) thru (t) on page A-4.
b. Proceed to Table A-7.
Table A-4. Bias and Reference Voltage Check
STEP ACTION RESPONSE NEXT ACTION
1 Check +12V bias. a. Normal (+12V ± 5%)
b. Voltage high
c. Output voltage lower or
higher than rating
a. Proceed to step (3).
b. Check U3 for short.
c. Check U3 for open.
Note: A short within U2, U6, U8, U9 or U14 can cause low
+12V or -12V bias voltages.
2 Check -5V reference. a. Normal (-5V ± 2%)
b. Voltage high
c. Voltage low
a. Proceed to step (3).
b. Check U5 for open.
c. Check U5 and Q2 for short.
3 Check -12V bias. a. Normal (-12V ± 5%)
b. High voltage
c. Low voltage
a. Proceed to +20V supply troubleshooting, Table A-5.
b. Check U1 for short.
c. Check U1 for open.
Table A-5. +20V Supply Troubleshooting
SYMPTOM STEP - ACTION RESPONSE PROBABLE CAUSE
High output voltage
(higher than rating)
1. Attempt to turn off Q9 by
shorting emitter-to-base
of Q9.
2. Measure voltage at
base of Q5.
a. Output voltage remains high.
b. Output voltage becomes near zero
volt.
a. Measured voltage is less than 0
volt.
b. Measured voltage is more than 0
volt.
a. Q9 shorted.
b. Remove short and proceed to step
(2).
a. Check for open CR13 or R36 and
check for defective U6A.
b. Check for defective Q5.

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