Revision B 4-15
Troubleshooting: General Fault Isolation
MAC 5000 resting ECG analysis system
2000657-002
Power-up Flow Chart
Refer to the CPU PCB schematic diagram found in the PCB Assemblies
chapter at the end of the manual.
Poor Quality ECGs
Poor quality ECGs can be caused by factors in the environment,
inadequate patient preparation, hardware failures related to the
acquisition module, leadwires, cables, or problems in the unit.
Use a simulator to obtain an ECG report. If the report is good, the
problem is external to the unit.
Ye s
Ye s
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Press ON key
Sh4
Micro-Controller
"MOE"
Sh8 pin 5
AC Present? Sh8
pin 13
Battery OK? Sh8
pin 17
Micro-Controller
"CURLY"
Sh2
configures FPGA
Sh2
"MOE" releases
nSysResest
Sh8 pin 10
Run application
software
Start-up screen
displayed
"CURLY" reads
SmartMedia card
and moves
instruction byte
to FPGA for
"unpacking"
StrongArm
access
SmartMedia card
via FPGA and
loads remaining
code to DRAM
"MOE" enables
+3VM and +5VM
four bytes loaded
to FPGA?
StrongArm
running?
Stabilization period
over?
"CURLY" asserts
WordRdy
Sh2 pin 9
FPGA puts
unpacked instruction
on StrongARM
data bus and
negates nWait
No
* Reset
3VC
No
No
No
Ye s
Ye s
*
MD1322-017A
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