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SECTION 6
NEG Plate
"A" bus
Electrode Plate
Troubleshooting POS Plate
Location of Positive Plate
Fuses F8 and F9
Troubleshooting Electrode Plate
D25,26
Bus
Diode Rectifier
"C" bus
"B" bus
POS Plate
D27,28
Cathode
Leads
ESP 400C and 600C Plasma Power Sources
1. Check ohms between NEG Plate and BR "A"
Bus. A reading of 2 ohms or less indicates one
or more shorted diodes. Replace all Diodes on
NEG Plate.
2. If fuses F8 and/or F9 were open in the first step,
make two more ohmmeter readings.
A. Measure resistance between the NEG Plate
and BR "B" bus.
B. Measure between NEG Plate and BR "C"
bus.
If resistance is 2 ohms or less in either case, replace
all the diodes on the NEG Plate.
1. Check ohms between POS Plate and BR "A"
Bus. A reading of 2 ohms or less indicates one
or more shorted diodes. Replace all Diodes on
POS Plate.
2. If fuses F8 and/or F9 were open in the first step,
make two more ohmmeter readings.
A. Measure resistance between the POS Plate
and BR "B" bus.
B. Measure between POS Plate and BR "C" bus.
If resistance is 2 ohms or less in either case, replace
all the diodes on the POS Plate.
1. Visually inspect for ruptured or burned diodes.
Replace only those damaged.
2. Check resistance between Electrode Plate and
the parallel pig tails (cathode leads) of D25 and
D26. If reading is 2 ohms or less, disconnect
leads from bus and check each diode. Replace
only shorted diodes.
Repeat procedure for D27 and D28. Replace only
shorted diodes.
Troubleshooting
6-15
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