(C&K
GROUND)
SY
-126”
+15v
sg650e
Figure 5-7. Front Rmel Probe Power Connector Voltages
q
If the correct voltages are present, troubleshoot the probe.
q
If the voltages are not present, check the + 15 V and -12.6 V green
LEDs
on
A8.
n
If the
LEDs
are on, there is an open between the A8 assembly and the
front panel probe power connectors, Put A8 onto an extender board and
measure the voltages at the following pins:
ASP2
pins 6 and 36
-12.6 volts
A8P2
pins 4 and 34
+ 15 volts
n
If the
LEDs
are off, continue with “Check the
Fuses
and Isolate A8”.
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
A8J2.
Connect a jumper wire from
A8TP2
to chassis ground. If either the
+ 15 V or -12.6 V fuse blows, or the associated green
LEDs
do not light, replace
A8.
5-20 Power Supply Troubleshooting
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