Motorola APX 7000 - Advanced Features; Peer-Location on the Display (ASTRO Conventional only)

5-32 Troubleshooting Charts: Removable Memory Failure
5.14 Removable Memory Failure
SD CARD ERROR
Synopsis
This failure relates to a memory card
failure for radios equipped with a
removable SD memory card.
The removable memory signal lines
are considered un-traceable with the
VOCON and Expansion board
assembled within the radio. A special
test fixture may be required to access
the signals. The shield on the VOCON
and expansion board may need to be
removed for diagnosis.
Replace card with known
good SD card
Swap Expansion
Board with know
good board.
Issue
Resolved?
Voltage level
correct?
Issue
Resolved?
Measure voltage on C2018 on
the expansion board.
Approximately 2.7 volts.
Inspect and repair
Expansion Board
connectors
END
Yes
No
Yes
No
Yes
No
Ensure the SD card is seated in the
socket correctly. If not reseat SD card.
SD Card should
be replaced with
a new card
No
Replace
Controller
Board
Replace
Expansion
Board
Problem
solved?
Yes
Swap Controller
Board with a
known good
board.
Yes
No
Measure voltage on C2128 on
the expansion board.
Approximately 3 volts.
No
Voltage level
correct?
Replace
U2105
Yes
Measure voltage on C2111 on
the expansion board.
Approximately 3 volts.
Voltage level
correct?
No
Check
MMC2_MPC
signal Path
and repair
necessary
connections
Yes
Using an o-scope verify activity
on MMC2_USD_CMD line.
Activity?
Inspect u2102
& associated
components
and replace if
necessary.
Inspect and repair
Expansion Board
connectors
Problem
solved?