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TROUBLESHOOTING & REPAIR PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
214
P/N 04288 Rev: A
Table 11-10: Status Outputs Check
PIN
(left to right)
Status
1 SYSTEM
OK
2 CONC
VALID
3 HIGH
RANGE
4 ZERO
CAL
5 SPAN
CAL
6 DIAG
MODE
7 SPARE
8 SPARE
11.5.7.5. Control Inputs – Remote Zero, Span
The control input bits can be tested by the following procedure:
22. Connect a jumper from the +5 pin on the Status connector to the x5V on the
Control In connector.
23. Connect a second jumper from the ‘-‘ pin on the Status connector to the A pin
on the Control In connector. The instrument should switch from
SAMPLE
mode to
ZERO CAL R
mode.
24. Connect a second jumper from the ‘-‘ pin on the Status connector to the B pin
on the Control In connector. The instrument should switch from
SAMPLE
mode to
SPAN CAL R
mode.
In each case, the M300E should return to SAMPLE mode when the jumper is
removed.
11.5.8.
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.
1. 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.)