No Bus Bias

Tests 1 - 3:

Tests 4 - 8:

SYMPTOM
NO BUS BIAS

POSSIBLE CAUSES
- DRB or DRB cable
- Junction block fuse # 1 open
- Open fused B(+) circuit
- MIC ground circuit open
- CCD bus(+)/(-) circuit shorted to ground
- CCD bus (+) open to MIC
- CCD bus (-) open to MIC
- MIC