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TROUBLESHOOTING & REPAIR |
TRANSISTOR MODULE TEST
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MATERIALS NEEDED
-Analog Volt/Ohmmeter (Multimeter) with RX10 or RX1000 scale.
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-Phillips Head Screwdriver
TEST PROCEDURE
1.Turn ON/OFF Power Switch to OFF.
2.Disconnect main input power to machine.
3.Perform the CAPACITOR DISCHARGE PROCEDURE.
4.Locate Power Board. See Figure F.8.
5.Locate and remove the leads marked #40 by removing the terminal screw connecting them to the Power Board.
See Figure F.9.
a.Move the leads out of the way.
6.Replace the terminal screw snugly, a little more than finger tight. The Transistor Module is mounted behind the Power Board and the terminal screw
completes the electrical connection.
7.Locate and remove the one lead marked NEG by removing the terminal screw connecting it to the Power Board.
See Figure F.9.
a.Move the lead out of the way.
8.Replace the terminal screw snugly, a little more than finger tight. The Transistor Module is mounted behind the Power Board and the terminal screw
completes the electrical connection.
9.Remove the two leads marked C by removing the terminal screw connecting them to the Power Board. See Figure F.9.
a.Move the lead out of the way.
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| NEGATIVE | POSITIVE (+) PROBE | EXPECTED |
| TO TERMINAL | TO TERMINAL | RESISTANCE |
| MARKED: | MARKED: |
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TEST | C | #40 | 1,000 ohms or less |
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TEST B | #40 | C | 4,500 ohms or higher |
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TEST C | #40 | Neg | 1,000 ohms or less |
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TEST D | Neg | #40 | 4,500 ohms or higher |
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TABLE F.1 - Transistor Module Resistance Tests
