Service manual

Performance Verification
2-8
Non-Volatile Random Access Memory (test 6) . Each 2-byte location of NVRAM is
written and read with a pseudo-random pattern. This is a non-destructive test. The
contents of the NVRAM are saved in RAM prior to this test, and then restored when the
test is complete. The NVRAM test result is identified on the report as
• NVRAM
System Gate Array Test (test 7) . Various registers in the System Gate Array are read
and written. The System Gate Array test result is identified on the report as
• GA
Front-End Interface Test (test 8) . The front-end interface test verifies that the ECG
front-end circuitry is responding to commands, and that the input multiplexers are
operating between ground and internal reference voltage. The front-end interface test
result is identified on the report as
•ECG FE
Manufacturing/Serial Interface Test (test 9) . The manufacturing/serial interface test
checks for proper communication with the optional expansion card UART. For this test to
pass, an extender card must be plugged into the expansion connector. The serial interface
test result is identified on the report as
•SIO
Remote Test (test A). The remote test checks the ability to transmit and receive data
through the spare remote port on the optional expansion board. The remote test is
identified on the report as
• REMOTE
Modem Test (test B) . The modem test verifies that the cardiograph is sending the
expected signals to the modem, and that the modem is receiving and responding
appropriately to signals from the cardiograph. The optional expansion board must be
installed to connect to the modem. The front end and RS-232 port test tool described in
Chapter 4 can help differentiate modem and cardiograph problems. See the section in
Chapter 4 titled “Test Tools” for instructions about using this tool. The modem test is
identified on the report as
• MODEM