4. Connect the positive (+) meter lead to the negative (-) MK3 (C). Connect the negative (-) meter lead to MK1 terminals R, S, and T in sequence. Each reading
should show a diode drop.
5. Reverse the meter leads with the negative (-) meter lead to the negative (-) MK3 (C). Connect the positive (+) meter lead to MK1 terminals R, S, and T in
sequence. Each reading should show open.
Incorrect Reading
An incorrect reading here indicates the soft charge rectifier is faulty. The rectifier is not serviced as a component. Replace the entire soft charge card in accordance
with the disassembly procedures. Reconnect the MK3 on the soft charge card after these tests.
Illustration 6.7: Soft Charge Card Connectors
380-480/500V: Blue MOV and 8 PTCs. 525-690V: Red MOV and 6 PTCs
1 MK1 3 MK4
2 MK3 4 MK2
High Power Service Manual for Unit Sizes 6x
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