SECTION 6 Troubleshooting
ESP 400C and 600C Plasma Power Sources
6-15
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.
Troubleshooting POS 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.
Troubleshooting Electrode Plate
D27,28
D25,26
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.
“C” bus
“B” bus
“A” bus
NEG Plate
Electrode Plate
POS Plate
Diode Rectifier
Cathode
Leads
Bus
Location of Positive Plate
Fuses F8 and F9
Summary of Contents for 0558001729
Page 1: ...F 15 657 Jun 2005 Installation Operation and Maintenance for the ESP 400C Plasma Power Source...
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Page 110: ...SECTION 7 Replacement Parts ESP 400C Plasma Power Source 7 10 7 7 Top View...
Page 112: ...SECTION 7 Replacement Parts ESP 400C Plasma Power Source 7 12 7 8 Back Inside View 2 1 4 2 3...