Error Messages - Agilent Technologies HP 8719D Service Manual

Error Messages

Three error messages are associated with the power supplies functional group.
They are shown here.
POWER SUPPLY SHUT DOWN!
n
One or more supplies on the A8 post regulator assembly is shut down due to
one of the following conditions: overcurrent, overvoltage, or undervoltage.
Refer to "If the Red LED of the Al5 is On" earlier in this procedure.
POWER SUPPLY HOT!
n
The temperature sensors on the A8 post regulator assembly detect an
overtemperature condition. The regulated power supplies on A8 have been
shut down.
Check the temperature of the operating environment; it should not be greater
than +55 OC (131 OF'). The fan should be operating and there should be at
least 15 cm (6 in) spacing behind and all around the analyzer to allow for
proper ventilation.
Check the Fuses and Isolate A8
Check the fuses associated with each of these supplies near the A8 test points
If these fuses keep burning out, a short exists. Try isolating A8 by removing it
from the motherboard connector, but keeping the cable A15Wl connected to
V or -12.6 V fuse blows, or the associated green LEDs do not light, replace A8.
If the + 15 V and -12.6 V green LEDs light, troubleshoot for a short between
the motherboard connector pins XA8P2 pins 6 and 36 (-12.6 V) and the front
panel probe power connectors. Also check between motherboard connector pins
Power Supply Troubleshooting