Top/Cid Display Failure - Motorola APX 5000 Service Manual

5-22
5.5

Top/CID Display Failure

No Top Display
Replace Control Top
Assembly
Problem
Resolved?
No
Check DC on V_EXT_1.85
(pin 29 of J2101)
1.8V < V < 2.0V?
Yes
Check DC on V_2.775D
(pin 30 of J2101)
2.7V < V < 2.9V?
Yes
Check SPI CLK (R2136),
Data (Pin 39 of J2101),
and CS (Pin 43 of J2101)
Signals Present?
Yes
Check Mating Board
Connectors
Replace Board With
Bad Connectors As
Needed
Troubleshooting Charts: Top/CID Display Failure
Yes
End
No Proceed to DC
Flowchart
No
No
Replace Vocon
Board