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General Troubleshooting & Repair of the M703E Calibrator M703E Calibrator Operators Manual
11.4.8.5. Control Outputs
Table 11-12: Control Outputs Pin Assignments and Corresponding Signal I/O Functions Check
PIN (LEFT TO RIGHT) STATUS
1
CONTROL_OUT_1
2
CONTROL_OUT_2
3
CONTROL_OUT_3
4
CONTROL_OUT_4
5
CONTROL_OUT_5
6
CONTROL_OUT_6
7
CONTROL_OUT_7
8
CONTROL_OUT_8
9
CONTROL_OUT_9
10
CONTROL_OUT_10
11
CONTROL_OUT_11
12
CONTROL_OUT_12
To test the Control Output electronics:
1. Connect a jumper between the “E“ pin and the “” pin on the status output connector.
2. Connect a 1000 ohm resistor between the “+” pin and the pin for the status output that is being tested.
3. Connect a voltmeter between the “” pin and the pin of the output being tested (see Table 11-12).
4. Und
er
the
DIAG SIGNAL I/O menu (See Section11.1.3), scroll through the inputs and outputs until
you get to the output in question.
5. Alternately, turn on and off the output noting the voltage on the voltmeter.
It should vary between 0 volts for ON and 5 volts for OFF.
11.4.9. CPU
There are two major types of failures associated with the CPU board: complete failure and a failure associated
with the Disk-On Chip on the CPU board. If either of these failures occur, contact the factory.
For complete failures, assuming that the power supplies are operating properly and the wiring is intact,
the CPU is bad if on powering the instrument:
The vacuum fluorescent display shows a dash in the upper left hand corner.
The CPU Status LED, DS5, is not flashing. (See Section 11.1.4.1.)
There is no activity from the primary RS-232 port on the rear panel even if “? <ret>” is pressed.
In some rare circumstances this failure may be caused by a bad IC on the motherboard, specifically U57
the large, 44 pin device on the lower right hand side of the board. If this is true, removing U57 from its
socket will allow the instrument to startup but the measurements will be incorrect.
If the calibrator stops part way through initialization (there are words on the vacuum fluorescent display)
then it is likely that the DOC has been corrupted.
194 05744 Rev B