Check the Green
LEDs
on
A8
Remove the top cover of the analyzer and locate the
A8
post regulator; use the
location diagram under the top cover if necessary. Check to see if the green
LEDs
on the top edge of
A8
are all on. There are eight green
LEDs
(one is not
visible without removing the PC board stabilizer).
q If all of the green
LEDs
on the top edge of
A8
are on, there is a 95%
confidence level that the power supply is verified. lb
confirm
the last 5%
uncertainty of the power supply, refer to “Measure the Post Regulator
Voltages” (next).
q If any LED on the
A8
post regulator is off or Eashing, refer to “If the Green
LEDs
of the
A8
are not
alI
ON” in this procedure.
Measure the Post Regulator Voltages
Measure the DC voltages on the test points of
A8
with a voltmeter. Refer to
Figure 5-3 for test point locations and
Table
5-l
for supply voltages and limits.
+f%v
AGND
+5v!?
SIX
-1%
-12.6VPP
+15V
-5VU
-5.2V
+22v
t6V
Figure 5-3.
A8
Post Regulator
‘l&t
Point Locations
Power Supply Troubleshooting
5-5
To Next Page
Loading...
Need help?
General
