Patient Module And Cable Test; Cpu Assembly Test - HP PageWriter XL M1705B Service Manual

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To begin running the tests you press Test. The test or tests that
you selected then run continuously until you stop the Extended
Self-test. After each successful pass through the tests, the number in
the message Selected tests passed nnrzn times. increases by one.
To stop the Extended Self-test, you must place the cardiograph in
Standby.
Patient Module and Cable Test
This test looks for failures in the patient module and patient data
cable, and generates a test pattern in the patient module display.
If the patient module fails the test, the message Patient module
test failed. appears on the keyboard display. If the cable fails
test, the message Patient module cable test failed. appears.
the
The patient module test does not test the patient electrodes or
leadwires. Test the patient electrodes and leadwires by recording
an ECG from a patient or ECG simulator as described later in this
section.
The M1702A patient module does not have a display.
The test patterns displayed on the patient module consist of (in this
order):
1 all white cells
H checkerboard cells
H all black cells
w inverse checkerboard cells
n
SO characters (displayed in 5 successive groups of 16)
n
all white cells
You must observe the patient module display while the test pattern is
running to ensure:
w accurate rendition of all patterns and clia.racters
n
no random lines or dots are displayed
Before and after the tests, asterisks appear in the display.
CPU Assembly Test
This test looks for failures in the following CPU assembly
subsystems:
Real-time Clock
Printer Controller
Read-Only Memory (ROM)
Random Access Memory (RAM)
Digital Signal l'roccssor (DSP)
DSP RAM
Performance Verification and Maintenance 4-3