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section 6
6.4.1 power rectifiers and blocking diodes
troubleshooting procedures –negative plate
Location of Neg. Plate
Location of fuses F8 and F9
Power Rectifiers
Blocking Diodes
Power Rectifiers
Procedure to access behind the front panel
1. Remove top cover and side panels
2. Locate and disconnect plug in rear of ammeter (attached
tone red and one black wire)
3. Remove pilot arc switch
4. Disconnect voltmeter
5. Disconnect orange and yellow wires from relay K4.
6. Remove two bolts holding the left side of the front panel
to the base.
7. Remove three bolts holding across the center base of the
front panel. These are accessed from underneath.
8. Remove one of the bolts holding the right side of the
front panel to the base. Loosen the second bolt. Of
these two bolts, remove the bolt on the left and loosen
the bold on the right.
9. Swing the front panel out to gain access to power recti-
fier components.
1. Visually inspect fuses F8 and F9. Replace if they show signs
of being blown or melted. Inspect diodes. If ruptured
or burned, replace all diodes on the NEG Plate. If diodes
appear to be OK, proceed to next step.
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