5. Disconnect the PWM connectors from the compressor housing bearing feedthroughs, keeping the
PWM attached to the Backplane. Refer to Figure 4-251 PWM on page 225.
6. Using a multimeter set for diode measurements, place the red (+) lead on the HV- test point of the
Backplane and the black (-) lead in the first pin hole of the PWM connector, ensure the lead makes
contact with the clip in the pin hole. Refer to Figure 4-253 Connecting Leads to PWM Connector and
HV- and HV+ Test Points. The measured voltage drop should be 0.39-0.46VDC.
7. Repeat Step 6 for all 10-pin holes on both left and right PWM connectors.
Figure 4-253 Connecting Leads to PWM Connector and HV- and HV+ Test Points
8. Still set on diode measurement, place the black (-) multimeter lead on the HV+ test point of the
Backplane and the red (+) multimeter lead in the first pin hole of the PWM connector, ensure the lead
makes contact with the clip in the pin hole. Refer to Figure 4-253 Connecting Leads to PWM Connector
and HV- and HV+ Test Points. The measured voltage drop should be 0.39-0.46VDC.
9. Repeat for all 10-pin holes of both PWM connectors.
10. If any of the test results are out of the 0.39 - 0.46 VDC range, the PWM is defective and should be
replaced.
4.28.4 PWM Removal and Installation
4.28.4.1 PWM Amplifier Removal
1. Isolate compressor power.
2. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
3. Wait for the LEDs on the Backplane to turn off.
4. Remove the Serial Driver. Refer to Section 4.26.4 Serial Driver Removal and Installation on page 218.
5. Remove the BMCC. Refer to Section 4.27 BMCC on page 220.
6. Disconnect the two (2) connectors for the PWM and bearing power feedthroughs.
7. Remove the fasteners below the PWM that secure the heat sink to the main compressor housing. Refer
to Figure 4-254 Removing the PWM Amplifier.
Figure 4-254 Removing the PWM Amplifier
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Summary of Contents for Turbocor TT Series
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