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| TROUBLESHOOTING & REPAIR |
INPUT CONTACTOR COIL RESISTANCE AND
SUPPLY VOLTAGE TEST (CONTINUED)
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WARNING
ELECTRIC SHOCK can kill.
With the input power ON, there are high volt- ages inside the machine. Do not reach into the machine or touch any internal part of the machine while power is on.
9.Carefully apply the correct input power to the
10.Set the
11.Carefully check for approximately 40 VDC at leads #303A to #330. If the 40 VDC is applied to the coil leads, the contactor should activate.
12.If the reading is less than 40 VDC or not present, perform the DC Buss Power
Supply PC Board Test.
13.Also check leads #303A, #330, #303, #403, #230 and their associated plugs for loose or faulty connections. See the Wiring Diagram.
TEST FOR CONTACT CONTINUITY
1.Disconnect input power to the
WARNING
ELECTRIC SHOCK can kill.
Disconnect input power before removing the case cover and performing tests or making repairs to the machine.
2.Perform the Power Module Capacitor Discharge procedure.
3.Locate the input contactor and coil leads #303A and #330. See Figure F.3.
4.Label and disconnect leads #303A and #330 at their
5.Using the external, isolated 40 VDC power supply, carefully apply 40 VDC to the coil leads. The contactor should activate.
6.With the contactor activated, check the con- tinuity across the large contacts. (Zero ohms or very low resistance is normal.) See Figure F.3. If the resistance is high, the input contactor is faulty. Replace the input contactor.
7.When the contactor is not activated, the resistance should be infinite or very high across the contacts. If the resistance is low, the input contactor is faulty. Replace the input contactor.
8.Remove the 40 VDC external supply and reconnect the coil leads previously removed.
9.If finished testing, perform the Case Cover Replacement procedure.
