Operator Manual, Supercharger 60

R3.0

10.2FINDING A SHORTED DISCHARGE TRANSISTOR

Since all discharge transistors are wired in parallel, a single shorted transistor will short the entire bank.

The procedure that follows will allow the finding of the shorted transistor without requiring removal and testing of each device individually.

10.2.1.EQUIPMENT REQUIRED

•Digital Voltmeter.

•Battery, 24V.

•Lamp, 24V (lamp must draw at least 0.5 A).

10.2.2.PROCEDURE

10.2.2.1. TURN UNIT OFF, DISCONNECT IT FROM THE WALL OUTLET. 10.2.2.2. Connect the lamp in place of the discharge current limiter (see fig 8). 10.2.2.3. Connect the charger to the battery.

10.2.2.4. If the lamp illuminates, it indicates that there is a short in the discharge circuit, generated by one or more shorted transistors.

10.2.2.5. Measure the voltage across the individual .22 OHM emitter resistors (RED-RED-GOLD-GOLD) (see fig 8).

•A non zero reading, approximately 0.1V for a lamp drawing .5A, indicates current flow due to a transistor with a collector to emitter short.

•NOTE: A non zero reading on all emitter resistors (0.02V approx for a lamp drawing 0.5A) indicates a different failure mode (collector to base short; refer to step 7).

10.2.2.6.Remove any shorted transistors and repeat steps 4 and 5 until a no short reading is obtained. Replace defective devices only with transistor type MJ15023.

10.2.2.7.If all transistors appear to be shorted (ALL emitter resistors reading a voltage), then, one or more have failed with a collector to base short, causing the remainder of the transistors to turn on. It will then be necessary to check each transistor individually.

•This can be greatly facilitated by searching for a zero reading. This will indicate the shorted device.

10.2.2.8.When replacing transistors, make sure that the base and emitter pins engage properly in the socket contacts. Add heat sink compound and torque the screws properly to insure a good thermal transfer.

•NOTE: If replacing any of the control transistors (Q1 and Q2), note that they are mounted with a mica insulator.

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Precision Trading 60 R3.0 operating instructions Finding a Shorted Discharge Transistor, Equipment Required, Procedure
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