Partlow MRC 7800, Installation, Wiring, Operation Manual

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5.5.1 TEST 1 INTERNAL RAM TEST
Tests the Random Access Memory internal to the microprocessor. No special test equipment
is required.
With tSt1 displayed, press and hold the DOWN key, then press the SCROLL key. tSt1 will be
displayed momentarily while the test is in progress. Upon successful completion, the instru-
ment will proceed to Test 2.
5.5.2 TEST 2 EXTERNAL RAM TEST
Tests the battery backed up RAM external to the microcomputer. No special test equipment
is required.
After completion of Test 1, tSt2 will be displayed momentarily while the test is in progress.
Upon successful completion, the instrument will proceed to Test 3.
5.5.3 TEST 3 PROGRAM EPROM TEST
This is a checksum test to verify data integrity of the stored program. No special test equip-
ment is requried.
After completion of Test 2, tSt3 will be displayed momentarily while the test is in progress.
Upon successful completion of Test 3, tSt1 will be displayed.
5.5.4 TEST 4 EXTERNAL RAM CHECKSUM TEST
This is a checksum test to verify the integrity of date stored in RAM and indicate the number
of times the instrument has had an Error 16 or 17. The unit may have automatically
recovered from these errors. No special test equipment is required.
5.5.5 TEST 5 KEYPAD/DISPLAY TEST
This test allows the operator to verify that the keys work and that all display elements can be
lighted. No special test equipment is required.
With tSt5 displayed, press and hold the DOWN key, then press the SCROLL key and then
release both keys. The display will go blank. The following code will be displayed while the
corresponding key is pressed:
Key Display
SCROLL SCrL
UP uAro
DOWN dAro
UP and DOWN (All Led's and segments lit)
DISPLAY SELECT diSp
SCROLL and UP (exit)
To exit, press the SCROLL and UP keys simultaneously, tSt5 will be displayed.
5.5.6 TEST 6 RELAY/SOLID STATE RELAY DRIVER OUTPUT TEST
Allows the operator to verify that the Relay and/or the Solid State Relay Driver output(s) are
working. A volt/ohm meter will be required to test the output.
With tSt6 displayed, press and hold the DOWN key, then press the SCROLL key. oFF will be
displayed. For SPST or SPDT Relay outputs, connect the meter across the relay output in
the ohm scale. For SPDT Relay outputs, connect the meter across the N.O. and COM output
in the ohm scale. The meter should read continuity with the relay on and infinity when the
relay is off. For SSR Driver outputs, connect the meter across the output in the Volt DC scale.