220 Chapter4
Troubleshooting the Analyzer
Problems at Instrument Power-Up
Table 4-1 Instrument Failure Symptoms at Power-On
Line LED
A8 LED −15 V
A8 LED +15 V
A8 LED +5 V
A8 LED +12 V
B1 Fan
A2 Display
Possible Cause
ON ON ON ON ON ON ON Normal Operation*
OFF ON ON ON ON ON ON W1 wiring to Line LED, or Line
LED
OFF OFF OFF OFF OFF OFF OFF Line fuse, A8 primary circuit
failure
ONMMMMMXA8 primary overload
ON OFF ON ON ON ON X −15 V supply failure
ONOFFMMMMX−15 V supply overload
ON ON OFF ON ON ON X +15 V supply failure
ON M OFF M M M X +15 V supply overload
ON M M OFF M M X +5 V supply failure or supply
overload
ON ON ON ON OFF OFF OFF +12 V supply failure
ON M M M OFF OFF OFF +12 V supply overload
ON ON ON ON ON OFF ON Fan failure or open along +12 V
supply line to fan
ON ON ON ON ON ON OFF NoWRUP signal
ON ON ON ON ON ON X A16 assembly failure
ON ON ON ON ON ON OFF Display failure, intensity-control
failure, or A16 memory failure
ON ON ON ON ON ON M Intensity control failure, or A16
memory failure
M = LED or assembly is momentarily on, then goes off.
X = Status of LED or assembly does not matter.
* DS13 remains on after PRESET is pressed.
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