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TROUBLESHOOTING & REPAIR
ANALOG POWER PC BOARD VOLTAGE TEST (continued)
TABLE F.1. – ANALOG PC BOARD OUTPUT VOLTAGE TABLE
TEST POINTS | COMPONENT TESTED | VOLTAGE READING |
|
|
|
1J42 to 6J42 | Chopper Power Supply | +20 VDC |
|
|
|
2J42 to 7J42 | Weld Control PC Board Power Supply | +5 VDC |
|
|
|
5J42 to 7J42 | Weld Control PC Board Power Supply | +15 VDC |
|
|
|
9J42 to 7J42 | Weld Control PC Board Power Supply |
|
|
|
|
10J42 to 4J42 | Weld Control PC Board Power Supply | +15 VDC |
|
|
|
7.If finished testing, perform the Case Cover Replacement procedure.
NOTE ON THE BYPASS PC BOARD
The purpose of the Bypass PC board circuitry is to provide a more attractive path to ground for transient spikes and high frequency signals that could damage sensitive circuit components. The Ranger 250 Bypass PC board cannot be tested. However, a faulty Bypass PC may show visible physical damage. As a general rule of practice, if you have catastrophic damage to any other PC board on the machine, the Bypass PC board should be replaced as well.
