Troubleshooting The Power Supply; Troubleshooting The Dc/Dc Converter - HP M2350A Service Manual

Troubleshooting the System
Troubleshooting the DC/DC Converter
Troubleshooting the Power Supply
If the +5.15V, + 12V and -12V power supplies are present on the Global Bus, three LEDs will
be lit on the Utility CPU. It should be noted that though this is an indication of whether the
power supplies are present it does
not
indicate whether the voltages are within specification.
Troubleshooting the DC/DC Converter
The input and output signals of the DC/DC Converter may be checked, at the connectors, to
ensure that the signals are present and within specification.
Input Connector (15-pin "D" type)
Signal (+/-%)
Pin Number
+6OV DC input supply (+/-lo%)
6, 7, 8 & 15
+6OV DC loop-through supply (+/-lo%)
13 & 14
OV input ground
1, 2, 3 & 9
OV loop-through ground
10 & 11
No signal
4, 5 & 12
Output Connector (64A,Gpin DIN)
Signal (+/-%) Pin Number
+ 12v supply (+ /-10%) lA,C & 2A,C
-12v supply (+/-10%) 20A,C
+5,15v supply (+/-2%)
23A,C to 29A,C incl.
+ 60V loop-through supply (+/-lo%)
31A,C & 32A,C
Power fail signal 16A,C
System reset signal
17A,C
OV supply ground 3A,C to 9A,C incl.
OV loop-through ground 30A,C
9-20