Manual 0-2745 27 SECTION 4: SERVICE TROUBLESHOOTING
Replace the FET/Heatsink Assembly if any of the
above tests are open or shorted.
5. FET Output Clamp Diodes Check
Use an ohmmeter to check the resistance of the out-
put clamp diodes, (+ out) E17 and (- out) E18, per the
following procedure:
NOTE
The wires on E16 and E18 should still be discon-
nected from both FET/Heatsink Assemblies.
a. Place the meter (+) lead on E17 and the meter (-)
lead on E18 of the FET/Heatsink Assembly to
check the output clamp diode resistance. The
meter should indicate >1 meg ohms.
b. Place the meter (+) lead on E18 and the meter (-)
lead on E17 of the FET/Heatsink Assembly to
check the output clamp diode resistance. The
meter should indicate >1 meg ohms.
Replace the FET/Heatsink Assembly if any of the
above tests are open or shorted.
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