West Control Solutions MRC 8000 - Manual (Page 57)

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Send mode. When the sending instrument displays rEC, the receiving instruments should
display rEC1. To terminate the test, press the SCROLL key for one second. Upon exit, tStA
will be displayed. The existence of the communications hardware is dependent on the
hardware configuration.
Trouble-shooting and Diagnostics 5.6
The Trouble-shooting Guidelines Section consists of two columns. The first column is a list of
some possible instrument conditions. The second column is a list of steps that should improve
the condition. The steps should be performed in order until the condition improves or all the
steps have been completed. If the instrument condition has not improved, contact the nearest
representative or the factory for assistance.
Trouble-shooting should be performed by qualified personnel using the proper equipment and
following all safety precautions. Whenever possible the trouble-shooting should be accom-
plished with the electrical power disconnected. The instrument contains static sensitive
components so care should be taken to observe anti-static procedures.
CONDITION CORRECTION STEPS
Display(s) is/are blank 1. Verify that the correct instrument power, as indicated
on the wiring label on the platen, is supplied to TB 1
terminals 1 & 2. Check the position of the power select
switch, on 230 VAC models, correctly indicates the
power that is connected to the instrument. If the switch
does not indicate the correct voltage, reposition as
necessary. If the voltage is not correct, check the
power source.
2. Turn off the instrument power. Wait about 5 seconds
then turn the power on again.
3. Turn off the instrument power, open the cover, loosen
the platen hold down screw, and swing the platen out
of the way. Inspect the instrument for poor
connections.
a. The white ribbon cables that connect the
Processor board (Appendix A-1, page 62) to
the platen must be properly aligned and
seated in the sockets.
b. The display board(s) white ribbon cable(s)
pins should be properly aligned and seated in
the sockets on the platen board.
c. Inspect the EPROM (U7), RAM (U8) and
microprocessor chips (U5)to see that the legs
are properly seated in their sockets on the
Processor Board (page 62).
d. Close the platen and tighten the hold down
screw. Close the cover and turn on the power
to see if the display(s) will now light.
4. Turn off the instrument power. Press and hold the UP
and DOWN keys. Turn on the power. Hold the keys
pressed for about 10 seconds. If the display(s) light
the model number, Program and Tune mode
parameters will need to be re-entered (pages 28 thru
35 or Software Ref. Sheet, page 72, if already filled
out).