Test Point 4

Test point 4
Data lead, DSP-PCM

Open circuit/short to ground
Short to B+
Signal disturbance

Fault code 23

Open circuit/short to ground
1. Pull off plug II on the display and operator control unit.
2. Pull off plug I (18-pole) on the amplifier.
3. Check lead from plug II pin 14 to plug I pin 17 for continuity and short to ground.

Short to B+
1. Pull off plug II on the display and operator control unit.
2. Pull off plug I (18-pole) on the amplifier.
3. Check lead from plug II pin 14 to plug I pin 17 for short to B+.

Signal disturbance
Check lead from plug II pin 14 to plug I pin 17 for short with other leads.