02/A0, Adsic Checksum Failure; 02/81, Dsp Rom Checksum Failure - Motorola ASTRO Digital Spectra Service Manual

5-10
Fail 02/A0
ADSIC Checksum
Failure
Use ohmmeter to electrically
verify following signal
connections to source IC:
Signal @ U406 Source
D8-D23 U405
A0-A2,A13-A15 U405
PS*,RD*,WR* U405
SELx,RSTx U204
SPD,SCLK U204
1 VDDD,VDD1,VDD2,
VDD3 +5V
VDDAb,VDDA +5VA
VSSD,VSS1,VSS2,
VSS3 GND
2 VSSA,VSSAb
AGND
ABI R402
1 Note: Finding an open at VDDx
may be difficult because of low
isolation between supply pins.
2 Also measure continuity
between GND and AGND through
jumper JU407.
No
Connections
Repair opens.
good?
Verify SPI operation
by verifying
programming of
synthesizer IC
initiated by a channel
change. If pass find
connection problems to
U406. A failure
indicates a software
problem or hardware
fault with U204.
TECHNICAL PUBLICATIONS DEPT.
ASTRO SABER C.11 DWG. NO.
FAIL 02/A0 ADSIC CHECKSUM MAEPF-24416
FAILURE TROUBLESHOOTING
ILLUSTRATOR DATE ENGINEER DATE PROGRAM DISK
Chart C.11

02/A0, ADSIC Checksum Failure

July 1, 2002
Synopsis
The ADSIC calculates a checksum of the
configuration bus data programmed
through the Host C 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 looking for the 8KHz @
IRQB. This signal is present only after
the host C has programmed the IC.
Partial operation of the device may point
to a missing supply connection. Basic
failure modes are as follows:
1) An open or short in the DSP address
or data bus and select lines may cause
an error in reading the checksum.
2) Missing or improper 2.4 MHz clock
reference.
3) Missing signal in the Host C SPI
programming interface.
4) Open or missing analog or digital
supply at one or more IC pads.
5) General IC failure.
Verify clock at
Verify 2.4MHz
No
Yes
Clock
reference clock at
Present?
source and/or
U406 IDC per Fig.
fix connection.
W10
Yes
Verify SPI
programming
No
Programming
signals signals per Fig.
verified?
W6. initiated by
mode change.
Yes
Verify U406-
No
RSTx goes high on
Reset high? Replace U204.
initial power up.
Yes
Replace U406.
CHECK
Repair opens.
ABACUS
Repair opens.
MAEPF-24416-O
Fail 02/81
DSP ROM Checksum
Synopsis
Failure
This failure indicates the DSP
ROM program code is incorrect.
It is implied that the DSP found
Visually inspect all
and executed enough valid code
leads to U404 with
at power up to get to the point
a 5x glass.
of verifying the rest. Basic
failure modes are as follows:
1) The contents of U404 has
been corrupted.
2) The decoding logic comprised
of U405 and U406 is not
No
Connections
working properly due possibly
good?
to circuit opens or shorts or
that a failure of one or more of
these ICs has occurred.
3) U405 has failed.
Yes
Due to the fact that the DSP
successfully initialized, a
Use ohmmeter to
failure in one of the ICs is not
electrically verify
likely.
following signal
connections to source IC:
Signal @ U404 Source
D0-D7 U405
A0-A13,A17 U405
A14-A16 U406
CE* U406
OE*,WE* U405
VCC +5V
VSS GND
Replace U404
No
Connections
good?
Yes Replace U406
ReFLASH DSP
ROM
Go to section
No
DSP ROM on ADSIC
ADSIC
Checksum
ReFLASH
Good?
Failure (02/A0).
passed?
Chart C.11
Yes
End
ASTRO SABER C.12
FAIL 02/81 DSP ROM CHECKSUM
FAILURE TROUBLESHOOTING
ILLUSTRATOR DATE ENGINEER
Chart C.12

02/81, DSP ROM Checksum Failure

Troubleshooting Charts
Yes
No
ADSIC
Good?
No
At radio power up,
verify U404
A14,A15,A16
Yes
transisiton to a high
logic state. Verify
activity(transitions
from high to low)
on U404 - CE*.
MAEPF-24417-O
TECHNICAL PUBLICATIONS DEPT.
DWG. NO.
MAEPF-24417
DATE PROGRAM DISK
CHECK
68P81076C25-C