HEWLETT-PACKARD 140A Instruction Manual

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HEWLETT-PACKARD 140A - It's a complete owner's manual ( also known as operating manual or user guide), and it's in PDF format. After placing order we'll send You download instructions on Your email address. See below for delivery information

The manual is available only in language(s): English

Link to manual will be sent on Your email address after You place order.

This product was added to our catalog on Tuesday 15 April, 2008.

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Model 140A Section V
Table 5-4
Table 5-4. Troubleshooting the Low Voltage Supply
supply Symptom Procedure Indication Conclusion
- l0OV High Output 1. Measure voltage across Approximately 6.5 CR165 OK
Voltage CR165 volts or less
More than approx CR165 open
6.5~
2. Disconnect the WHT-GRN- Output drops Ql62 OK
V10 wire from the edge of the
Output remains high Ql62 shorted
circuit board.
3. Reconnect the WHT-GRN- Output drops Q164 OK
V10 lead. Short emitter of
Output remains high Q164 shorted, and also
Q164 to base
possibly Q163 and Ql6l
(check emitter - collector
resistance with ohmmeter.)
4. Measure voltage across Same as output Q165 shorted
R173 Less than measured Ql66 open
high output
Low output 1. Measure voltage across 0 volts CR165 shorted
Voltage CR165 Approx 6 volts CR165 OK
2. Short WHT-GRN-VI0 wire Output remains low Q162 open
to anode end of CR165 (away
Output rises (more Ql62 OK
from plug-in compartment). negative)
3. Short base of Q164 to the Output rises Q164 OK
anode end of CR165 (away
Output remains low Q164 or possible Q163
from plug-in compartment). open
4. Short emitter to base on Output rises Q165 open
Ql66.
Output remains same Ql66 shorted
~ ~~
-12.6V High or Low 1. Check the -100 volt supply Normal Trouble in -12.6V supply
output
Abnormal Trouble in -lOOV supply
Voltage
~
High Output 1. Remove the WHT-GRN- Output drops Ql8l OK
Voltage BLU wire from the edge of
Output remains high Ql8l shorted
the board.
2. Replace WHT-GRN-BLU Output drops Q182 OK
wire. Short emitter of Q182
Output remains high Q182 shorted
to base.
3. Short emitter of Q185 to Output drops Q185 open
collector.
Output remains high Q183 open
3utput Low 1. Lift collector of Q184 Output remains low Q184 OK
(leave disconnected for
Output returns to Q184 shorted
remainder of -12.6V supply
normal
tests.)
Output goes higher CR184 open
than normal
2. Short emitter of Ql82 Output rises Ql8l OK
to collector
Output remains low Ql8l open
3. Lift collector of Q183 Output rises Ql82 OK
Output remains low Q182 open
01638-1 5-5