Troubleshooting Charts 5-7
6881076C25-D October 28, 2002
Chart C.5 01/90, General Hardware Failure Chart C.6 01/81, Host ROM Checksum Failure
No
No
Yes
Yes
No
Yes
Problem
corrected?
Replace
VOCON
Board.
Check
Command Board for
9.6 V and 5.0 VDC.
Fail 01/90
General Hardware Failure
Replace
Command
Board.
Go to
troubleshooting
for VOCON.
Is there
activity on BUSY, RX DATA,
and TX DATA lines?
Replace
Control
Head.
Replace
Command
Board.
MAEPF-25209-O
Synopsis
This failure indicates the Host
ROM program code is incorrect.
It is implied that the host
processor found and executed
enough valid code at power up
to get to the point of verifying
the rest. Basic failure modes
are as follows:
1) The contents of U205/U210
have been corrupted.
2) The decoding logic comprised
of U204 and U206 is not
working properly due possibly
to circuit opens or shorts or
that a failure of one or more of
these ICs has occurred.
3) U205 or U210 has failed.
Due to the fact that the Host C
successfully initialized, a
failure in one of the ICs is not
likely.
Repair opens.
Fail 01/81
Host ROM Checksum
Failure
Connections
good?
No
Yes
Visually inspect all
leads to U205 and
U210 with a 5x glass.
Check for operation of
U204 and U206 as
follows: During radio
power up Self-Test,
verify activity
(transitions from high
to low) on U205/U210 -
ROM1CS*/ROM2CS*,
and OE*.
Use ohmmeter to electrically
verify following signal
connections to source IC:
Signal @ U205/U210 Source
HD0-HD7 U204
HA0-HA13 U204
HA14OUT,HA15OUT U206
HA16,HA17 U206
ROMCS1*,ROMCS2* U206
OE*,MEMR/W* U206
VCC +5V
VSS GND
Replace
U205/U210.
No
MAEPF-24421-A
Yes
Host ROM
ReFLASH
passed?
No
Yes
Connections
good?
Repair opens.
Yes
No
ReFLASH Host
ROM
End
Initial
operation
checks
Good?
Refer to section on
Power-up Failure C.3
and/or Fails to
Bootstrap C.4.
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