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TROUBLESHOOTING & REPAIR
PROTECTION BOARD TEST (continued)
FIGURE F.17 – PROTECTION PC BOARD TEST POINTS
PROTECTION | |
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313 | 315 |
| 314 | |
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J8 | 317 | J15 |
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| 316 |
| 311 |
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TEST PROCEDURE
1.Turn off the Invertec STT and disconnect main AC input power to the machine.
2.Using the 5/16" nut driver, remove the case wraparound cover.
3.Perform the Input Filter Capacitor Discharge Procedure. See the Maintenance section.
WARNING
ELECTRIC SHOCK can kill.
• With input power ON, there are high voltages inside the machine. Do not reach into the machine or touch any internal part.
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WARNING
ELECTRIC SHOCK can kill.
• Before continuing with the test procedure, per- form the capacitor dis- charge procedure to avoid electric shock.
4.Locate the protection PC board just in front of the input rectifier and relay mountings.
5.Apply the correct input power and turn the machine ON.
6.Test for approximately 1VDC from plug J8 pin 1 (lead #311)(+) to plug J8 pin 3 (lead #313)
A.If approximately 1VDC is present, the protection PC board is functioning prop- erly.
B.If more than 5 VDC is measured, per- form the Capacitor Balance Test.
