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TROUBLESHOOTING & REPAIR PROCEDURES
11.5.6.3. Status Outputs
The procedure below can be used to test the Status outputs:
1. Connect a jumper between the "D" pin and the "s" pin on the status output
connector.
2. Connect a 1000 ohm resistor between the +5V and the pin for the status output
that is being tested.
3. Connect a voltmeter between the "D" pin and the pin of the output being tested
(see table below).
4. Under the DIAG à SIGNAL I/O menu (see Section 11.1.3), scroll through the
inputs and outputs until you get to the output in question. 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.
11.5.6.4. Control Inputs – Remote Zero, Span
The control input bits can be tested by the following procedure:
1. Connect a jumper from the "+" pin on the Status connector to the "U" on the
Control In connector.
2. Connect a second jumper from the Digital Ground pin on the Control In
connector to the A pin. The instrument should switch from SAMPLE mode to
ZERO CAL R mode.
3. Connect a second jumper from the Digital Ground pin on the Control In
connector to the B pin. The instrument should switch from SAMPLE mode to
SPAN CAL R mode.
In each case, the M400E should return to SAMPLE mode when the jumper is
removed.
262
Table 11-7: Status Outputs Check
Pin
(LEFT TO RIGHT)
1
2
3
4
5
6
7
8
Model 400E Ozone Analyzer
Status
SYSTEM OK
CONC VALID
HIGH RANGE
ZERO CAL
SPAN CAL
DIAG MODE
SPARE
SPARE
Instruction Manual
P/N 04316 Rev: B
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