Motorola Astro Digitalport Saber Troubleshooting 68p81076c10 A Manual

 
10-1 
Troubleshooting Charts 
10
This section contains detailed troubleshooting flowcharts. These charts should be used as a guide in 
determining the problem areas. They are not a substitute for knowledge of circuit operation and astute 
troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory 
section prior to troubleshooting a radio.
Most troubleshooting charts end up by pointing to an IC to replace. It is not always noted, but is 
good practice...

 
10-2 
Chart 1 . 800MHz Radio Main Troubleshooting Chart
NONO
MAEPF-24396-A
Good Power-
Up Self
Test?Is There
TX Power?Is TX
Deviation
OK?
NO
NOYES
YES
YES YES
YES
YES
NONO
NO
Receive
Audio?Poor
SINAD?ENDSTARTButtons
Functioning?Radio
Keyload
Failure?
Go to No Receiver
Audio Chart C.29See Button Test
Chart C.20Error
Message?
Display
Model?
Go to No Transmit
Audio Chart C.26Go to Transmitter
Chart C.37
NO
YES
NO
YES
YES
See Keyload
Failure Chart
C.19
NOYES
Go to No Receiver
RF Chart C.30Go to DC Switch...

 
10-3 
Chart 3 . Radio Power-Up Fail
Radio Power-Up
Failure.Verify standard
bias per table
Table 3 pertaining
to host µC.
No
Yes Standard Isolate and
repair problem.
See chart C.5bias 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...

 
10-4 
Chart 4 . Bootstrap Fail
Note: This
configuration
indicates the
µC is in
Bootstrap
mode waiting
for data.
Host µC
Bootstrap Failure.
Synopsis
The host µC bootstrap mode is
used during reprogramming of
the host µC and DSP FLASH
ROMs.  Refer to appropriate
Theory of operation section for
description of bootstrap
operation.  Since the operating
code is downloaded through the
serial bus instead of from the
ROM and is initially executed in
the µC internal RAM, this is a
good method of verifying...

 
10-5 
Chart 5 . DC Supply Failure
Is the
output on
U410-3
+5VDC?
NoVerify control
voltage at
Q207-4 is logic
low.
Control voltage
correct?
Check inverter
circuit of Q206
and R244.No
Replace Q207.Yes
Connect supply or
battery (B+) to radio
and turn
ON/OFF/VOLUME
CONTROL knob on.
Is B+ at
Q207-2?
DC Supply Failure
Synopsis
This failure implies a problem
with the DC power distribution.
It may relate to a battery
supply or one of the regulated
supplies.  Basic failure modes
are as follows:
1) Fuse S1...

 
10-6 
Chart 7 . 01/82 or 002, External EEPROM Checksum Failure
Reprogram
external EEPROM.External
EEPROM
reprogrammed?EndYes
Repair opens.
Connections
good? No
YesVerify operation of
Power-Down Reset Per
Fig. W9.
Reset
Functional?
Replace U407.
No
Yes
Fail 01/82 or 002
External EEPROM
 Checksum Failure
Use ohmmeter to electrically
verify following signal
connections to source IC:
Signal @ U201 Source
HD0-HD7 U204
HA0-HA13 U204
HA14OUT U206
EE1CS* U206
OE*,MEMR/W* U206
RESET* U407
VCC +5V
VSS GND
Check...

 
10-7 
Chart 9 . 01/88 MCU (Host µC) External SRAM Failure
Fail 01/88
Host µC External RAM
Failure.Verify standard
bias per table
Table 3 pertaining
to host µC.
No
Isolate and
repair problem.
Yes Standard
bias OK?.
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 RAM:
Use ohmmeter to
electrically verify
following signal connections
to source IC:
Signal @ U202 Source
HA0-HA13 U206
HD0-HD7 U204
MEMR/W* U206
OE*...

 
10-8 
Chart 11 . 02/A0, ADSIC Checksum Faiure
Synopsis
The ADSIC calculates a checksum of the
configuration bus data programmed
through the Host µC SPI interface.  This
failure indicates some problem with the
data.  It should be noted that this is a
non-fatal error as it happened.  As the
ADSIC controls some of the functions of
the DSP memory mapping and
interrupts, some aspects of ADSIC
programming problems may cause a
general DSP hardware failure.  Some
operation of the ADSIC can be
determined by...

 
10-9 
Chart 13 . 02/88, DSP External SRAM Failure U414
R3SEL*
appears
functional?Yes
Replace U414.Do all three
SRAMs
exhibit a
fault?Replace U405.Yes
MAEPF-24410-ANo
No
ADSIC
checksum
error?
Refer to
section on
FAIL 02/A0.
Chart C.11YesNo
During power
up Self-Test
verify E1~ on
U414 is enabled
by high to low
transitions of
R3SEL*.
During power-up
verify operation
of U415 by
looking for
transitions on
inputs IN_B and
IN_A.
Inputs to
U415
functional?
Replace U415.
Replace U405.
Yes
No
Synopsis
On...

 
10-10 
Chart 15 . 02/82, DSP External SRAM Failure U402
Does a fault
exist with
U403?
MAEPF-24408-B
Yes
Refer to a
Fail 02/84.
Replace U402.
Do all three
SRAMs
exhibit a
fault?Replace U405.YesNo No
Connections
good?
Repair opens.
Yes No
Check for
ADSIC
programming
checksum
error.
Use ohmmeter to
electrically verify
following signal connections
to source IC:
Signal @ U402 Source
D0-D23 U405
A0-A12 U405
WR*,RD* U405
E1* U405-A15
E2 U405-A13
X/Y*,V/S* GND
VCC +5V
VSS GND
Synopsis
On power up the DSP...