Test Mode 5.5 - Partlow MRC 7800 Installation, Wiring, Operation Manual

FOR INSTRUMENT WITH SOFTWARE REVISION R3.00 AND ABOVE:
P.dn will be displayed while the selected pen is moved to it's "HOME" position (toward the
chart hub) with the decimal point flashing to indicate this mode. Once "Pen Home" is found,
the pen will move to the inner ring and PEnL will be displayed. At this point, one of two
adjustments may be made; Pen Arc or Zero and Span.
Pen Arc - To adjust the pen arc, the UP and DOWN keys are pressed simultaneously to draw
an arc for visual reference. The display will show P uP while the selected pen moved upscale
to the top stop position. The pen then moves back downscale to nominally place the pen at
the outer ring (100%) of the chart. The display will now display ArC.
The pen arm may be loosened and the length adjusted to a position and angle to place the
pen tip near the outer ring then re-tighten the pen arm. Press any key and the pen will drive
to "HOME", then back to the inner ring (0%) and PEnL will be displayed.
Zero and Span - To begin a pen zero, with PEnL in the display, the UP or DOWN key may be
pressed to move the pen to the low end of the chart span (0%). When adjusted, press the
SCROLL key and P uP is displayed while the pen is moved to the outer edge (100%) of the
chart, then PEnh is displayed. To adjust pen span, use the UP and DOWN keys to adjust the
pen for the high end (100%) of the chart. When adjusted, press the SCROLL key and P dn
will be displayed for about 5 seconds while the pen is moved to the 50% point on the chart,
then PEn1 is displayed. Calibration may now be performed again to verify the accuracy, or
press the UP key twice to exit back to the CAL mode.

Test Mode 5.5

To enter the Test mode, press and release the SCROLL key until tESt appears on the display
then press the DOWN key. tSt1 will be displayed, press and release the SCROLL key to
advance the display to the desired test. Tests 1, 2 and 3 are performed as a unit so the
display will advance directly to tSt4 from tSt1. Listed below in Table 5-2 are the test proce-
dures available. Test 1, 2 and 3 are performed on start up, periodically during operation, and
on entry into the Test mode. Test 4 is executed on entry into and periodically during the
Operation mode. These tests can be used as a trouble shooting aid.
TABLE 5-2 TEST PROCEDURES AND DESCRIPTION
Test Description
Test 1 Microprocessor internal RAM test. Used to check the processor RAM to
make sure it is functioning correctly.
Test 2 External RAM test, used to test the RAM chip for proper function.
Test 3 EPROM checksum test, used to check that the EPROM program is correct.
Test 4 External RAM checksum test; instrument test and identifies how many
times Errors 16 and 17 have occured.
Test 5 Verifies that all keys are functional and all LEDs are working.
Test 6 Used to verify that all relays and solid state relay driver outputs are working
correctly.
Test 7 This procedure will allow operator to adjust the current output value to
check the output and to test the operation of the external device.
Test 8 Pen and chart motor operational check.
Test 9 Auxiliary input test, used to test remote reset.
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