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Revision L
Troubleshooting: Diagnostic Tests
DCOut Loopback Test. This involves connecting the DC Outputs to the DC
Inputs. The test sends all possible values out the DC Outputs and confirms that
correct values are read from the DC Inputs. A pass/fail result is displayed at the
end of the test.
To run the test, connect DCOut1 (pin2) to Analog Input (pin 7) and DCOut2
(pin 6) to Analog Input (pin 9).
PIN
Name
1
+12v
2
DC Output 1
3
*
TTL Trigger Output
4
Ground
5
Ground
* also called "QRS Trigger"
5
9
NOTE
If test fails you may need to replace the CPU board.
(See
"Main CPU Board Replacement"
ECGOut/QRSTrigger Loopback Test. This involves connecting the ECG Output
and TTL Trigger Output to the DC Inputs. The test sends all possible values out
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 displayed at the
end of the test. If test fails you may need to replace the CPU board. (See
CPU Board Replacement"
MAC™ 3500 Resting ECG Analysis System
2021337-036
Pin
6
DC Output 2
7
DC Input 1
8
ECG Output
9
DC Input 2
on page 5-22 .)
on page 5-22.)
31A
Name
1
6
"Main
33A
4-23
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