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4.28.4 PWM Removal and Installation on page 228
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4.26.4 Serial Driver Removal and Installation on page 218
32. Apply the compressor power.
33. Verify the +17V, +15, +5 and -15 VDC test points on the Backplane.
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If all voltages are /- 10%, all supply voltages are good
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If any of these voltages are not /- 10%, refer to Section 5.5.2 Determining the Cause of an
Energy Drain.
5.5.2 Determining the Cause of an Energy Drain
5.5.2.1 Determining if Serial Driver is Draining Energy
1. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
2. Test the Backplane voltages at the +24V, +15, +5, and -15 VDC test points.
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If all voltages are /- 10%, the Serial Driver is not draining energy
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If any of these voltages are not /- 10%), proceed to Step 3
3. Isolate the compressor power as described in the Section 1.8 Electrical Isolation on page 22.
4. Wait for the LEDs on the Backplane to turn off.
5. Remove the Serial Driver.
6. Re-apply the compressor power.
7. Test the Backplane voltages at the +24V, +15, +5, and -15 VDC test points.
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If all voltages are /- 10%, the Serial Driver is draining energy
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If any of these voltages are not /- 10%, another component is draining energy
5.5.2.2 Determining if BMCC is Draining Energy
1. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
2. First, follow the procedure in Section 5.5.2.1 Determining if Serial Driver is Draining Energy.
3. Isolate the compressor power as described in the Section 1.8 Electrical Isolation on page 22.
4. Wait for the LEDs on the Backplane to turn off.
5. Remove the Serial Driver. Refer to Section 4.26.4 Serial Driver Removal and Installation on page 218.
6. Re-apply the compressor power and test the Backplane voltages at the +24V, +15, +5, and -15 VDC test
points.
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If all voltages are within (+/- 10%) the BMCC is not draining energy
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If any of these voltages are not within (+/- 10%) proceed to Step 5
7. Isolate the compressor power as described in the Section 1.8 Electrical Isolation on page 22.
8. Wait for the LEDs on the Backplane to turn off.
9. Remove the BMCC (refer to Section 4.27 BMCC on page 220).
10. Re-apply the compressor power.
11. Test the Backplane voltages at the +24V, +15, +5, and the -15 VDC test points.
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If all voltages are within (+/- 10%) the BMCC is draining energy
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If any of these voltages are not within (+/- 10%) another component is draining energy
M-SV-001-EN Rev. H-1/23/2023 Page 271 of 294
Summary of Contents for Turbocor TT Series
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