Revision L MAC™ 3500 Resting ECG Analysis System 4-23
2021337-036
Troubleshooting: Diagnostic Tests
DCOut Loopback Test. This involves connecting the DC Outputs to the DC
In
puts. The test sends all possible values out the DC Outputs and confirms th
at
correct values
are read from the DC Inputs. A pass/fail result is displa
yed at the
end of the test.
To run the test, connect DCOut1 (pin2) to Analog Input (pin 7) and DCOut2
(p
in 6) to Analog Input (pin 9).
NOTE
If test fails you may need to replace
the CPU board.
(See “Main CPU Board Replacement” on page 5-22.)
ECGOut/QRSTrigger Loopback Test. This involves connecting the ECG Output
and
TTL Trigger Output to the DC Inputs. The test sends all possible values ou
t
the
ECG Output and a square wave out the TTL Trigger Output. It confirms
that
correct values
are read from the DC Inputs. A pass/fail result is displa
yed at the
end of the test. If
test fails you may need to replace the CPU board. (See
“Main
CPU Board Replacement” on page 5-22.)
PIN Name Pin Name
1 +12v 6 DC Output 2
2 DC Output 1 7 DC Input 1
3
*
TTL Trigger Output
* also called “QRS Trigger”
8
ECG Output
4 Ground 9 DC Input 2
5 Ground
1
6
5
9
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