Front Panel Troubleshooting (Al/A2) - Agilent Technologies HP 8719D Service Manual

Front Panel Troubleshooting (Al/A2)

Check Front Panel LEDs After Preset
1. Press @ZFi) on the analyzer.
2. Observe that all front panel LEDs turn on and, within five seconds after
releasing CM), all but the CHl LED turns off.
If all the front panel LEDs either stay on or off, there is a control problem
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between A7 and Al/A2. See "Inspect Cables," located later in this chapter.
If, at the end of the turn on sequence, the channel 1 LED is not on and all
q
HP-IB status LEDs are not off, continue with "Identify the Stuck Key. n
If you suspect that one or more LEDs have burned out, replace the Al
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keypad assembly.
Note
Port 1 and port 2 LED problems may be caused by the
malfunction of the LED board or the transfer switch.
Identify the Stuck Key
Match the LED pattern with the patterns in lhble 6-2. The LED pattern
identifies the stuck key. Free the stuck key or replace the front panel part
causing the problem.
Digital Control Troubleshooting