Motorola ASTRO Digital Saber, Service Manual

Page: 85 / 128

10-3
Chart 3 . Radio Power-Up Fail
Radio Power-Up
Failure.
Verify standard
bias per table
Table 3 pertaining
to host
µ
C.
No
Yes
Standard
Isolate and
repair problem.
See chart C.5
bias OK?.
Using RSS,
verify radio is
not inhibited.
Signal @ U206 Source
OE* U204
WE* U204
HD0-HD7 U204
4XECLK U204
HA0-HA4,
HA14_IN, HA15_IN,
HA16,HA17
U204
CSIO1* U204
CSPROG* U204
Verify Host Port:
Use ohmmeter to
electrically verify
following signal connections
to source IC:
Signal @ U202
Source
HA0-HA13 U206
HD0-HD7 U204
MEMR/W* U206
OE* U206
CS* U211
Signal @ U211 Source
IN_B U204
IN_A U206
Synopsis
This failure assumes the radio
fails to power up correctly and
does not send any Power up
failure messages via the
display or serial bus. Some
basic failure modes:
1) Radio is inhibited.
2) Battery voltage is low.
3) A problem exists with a
supply or system clock.
4) Host
µ
C code is corrupted.
5) Host FLASH or RAM is
faulty.
6) Corrupted host
µ
C
configuration register.
7) Host
µ
C or SLIC is faulty.
1
Radio is
not inhibited or
unable to
check?
Use RSS to
clear radio
inhibit.
Yes No
ReFLASH host
µ
C code.
Error
ReFLASHING
host
µ
C code?
Reverify inital
problem.
Initial
problem
persists?
Yes
No
Yes
No
End.
Error in
Bootstrapping
host
µ
C?
Yes
No
Refer to section
on Failure to
Bootstrap.
Chart C.4
Refer to host
µ
C
ROM checksum
error (FAIL 01/81).
Chart C.6
When reFLASHing
host code, there
are two
fundamental modes
of failure: 1) The
host
µ
C fails to
respond or 2)
reports an error
in programming.
During radio power-up
Self-Test, verify
activity (transisitons
from high to low) on
U202 OE* and WE*.
Using RSS,
reinitialize host
µ
C
configuration
register and
reverify initial
problem. Note:
if this requires
writing the
internal EE, the
radio must be
realigned.
Power up
failure fixed?
1
No
Yes
End.
Connections
good?
Repair
connections.
Yes No
Signals
verfied?
Replace U206.
During radio power-up
Self-Test, verify
activity (transisitons
from high to low) on
U202 CS*.
No
Yes
Signals
verfied?
Replace U202.
Verify operation of
U211 and logic AND
gate. During radio power
up Self-Test, verify
activity (transisitons
from high to low) on
U211 IN_B.
No Yes
MAEPF-24419-A
Signals
verfied?
Replace U211.
Replace U204.