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M703E Calibrator Operator’s Manual General Troubleshooting & Repair of the M703E Calibrator
11.4.8. MOTHERBOARD
11.4.8.1. A/D Functions
The simplest method to check the operation of the A-to-D converter on the motherboard is to use the Signal I/O
function under the DIAG menu to check the two A/D reference voltages and input signals that can be easily
measured with a voltmeter.
1. Use the Signal I/O function (See Section 11.1.3 and Appendix A) to view the value of
REF_4096_MV
and
REF_GND. If both are within 3 mV of nominal (4096 and 0), and are stable, ±0.5 mV then the basic
A/D is functioning properly. If not then the motherboard is bad.
2. Choose a parameter in the Signal I/O function such as
PHOTO_LAMP_DRIVE, O3_GEN_TEMP or
PHOTO_FLOW.
Compare these voltages at their origin (see the interconnect drawing and interconnect list in
Appendix D) with the voltage displayed through the signal I/O function.
If the wiring is intact but there is a large difference between the measured and displayed voltage (±10
mV) then the motherboard is bad.
11.4.8.2. Test Channel / Analog Outputs Voltage
To verify that the analog output is working properly, connect a voltmeter to the output in question and perform an
analog output step test as follows:
DIAG AOUT ANALOG OUTPUT
[10%] EXIT
Make sure that
the M700E is
in standby
mode.
SETUP X.X SECONDARY SETUP MENU
COMM VARS DIAG EXIT
SETUP X.X ENTER PASSWORD
000 ENTREXIT
Toggle these
keys to enter the
correct
PASSWORD
DIAG SIGNAL I/O
PREV NEXT ENTR EXIT
DIAG AOUT ANALOG OUTPUT
10% EXIT
Pressing the key under “0%” pause the
test. Brackets will appear around the
value: EXAMPLE: [20%]
Pressing the same key again will
resume the test.
Performs analog
output step test
0% to 100%
STANDBY ACT =STANDBY
<TST TST> GEN STBY SEQ SETUP
SETUP X.X PRIMARY SETUP MENU
O3 SEQ CFG CLK PASS MORE EXIT
05744 Rev B 191