Troubleshooting
Check the Main board 3.3 V
supply and that the PLD is
programmed
1. Check the 3.3 V s
upply on the Main board. This is accessible on pin 2 of the
connector to the Processor board (JR1). (See Figure 4-2.) This supply is
generated on the Main board from the 5.2 V input and must be present for
the PLD to work.
2. Locate S1 on the Main board (it is labeled “MFG_MODE”).
3. Press S1 and some of the channel relays should switch. Also, a small red
LED should come on just behind the support bracket. This function should
toggle on and off as repeatedly press S1.
4. If the MFG mode is not working, then the PLD is not running. Replace the
Main board.
Figure 4-2: Component locations on the P rocessor and Main boards
4–18 ECO8000 Series Service Manual
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