6-12 Chapter 6
Digital Control Troubleshooting
Front Panel Troubleshooting (A1, A2)
Front Panel Troubleshooting (A1, A2)
Check Front Panel LEDs After Preset
1. Press on the analyzer.
2. Observe that all front panel LEDs turn on and, within five seconds after releasing
, all but the Chan1 and Port 1 LED turns off. Refer to Figure 6-6.
• If all the front panel LEDs either stay on or off, there is a control problem between
A9 and A1/A2. See “Inspect Cables” on page 6-15.
• If, at the end of the turn on sequence, the Chan 1 LED is not on and all GPIB status
LEDs are not off, continue with “Identify the Stuck Key” on page 6-13.
• If you suspect that one or more LEDs have burned out, replace the A1 keypad
assembly.
NOTE Port 1 and Port 2 LED problems may be caused by the malfunction of the A23
LED board or the A24 transfer switch.
Figure 6-6 Preset Sequence
Preset
Preset
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