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Troubleshooting & Repair
10.6.7.4. CONTROL INPUTS
The control input bits can be tested by the following procedure:
10.6.8. CPU
10.6.9. RS-232 COMMUNICATION
10.6.9.1. GENERAL RS-232 TROUBLESHOOTING
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1. Connect a jumper from the +5 V pin on the STATUS connector to the U on the
CONTROL IN connector.
2. Connect a second jumper from the
the CONTROL IN connector. The instrument should switch from SAMPLE mode to
ZERO CAL R mode.
3. Connect a second jumper from the
the CONTROL IN connector. The instrument should switch from SAMPLE mode to
SPAN CAL R mode.
In each case, the T100 should return to SAMPLE mode when the jumper is removed.
There are two major types of CPU board failures, a complete failure and a failure
associated with the Disk-On-Module (DOM). If either of these failures occurs, contact the
factory.
For complete failures, assuming that the power supplies are operating properly and the
wiring is intact, the CPU is faulty if on power-on, the watchdog LED on the motherboard
is not flashing.
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 start up but the
measurements will be invalid.
If the analyzer stops during initialization (the front panel display shows a fault or warning
message), it is likely that the DOM, the firmware or the configuration and data files have
been corrupted.
This section provides general RS-232 communication information.
Teledyne ML's analyzers use the RS-232 protocol as the standard, serial communications
protocol. RS-232 is a versatile standard, which has been used for many years but, at
times, is difficult to configure. Teledyne ML conforms to the standard pin assignments in
the implementation of RS-232. Problems with RS-232 connections usually center around
4 general areas:
Incorrect cabling and connectors. This is the most common problem. Refer to Section
3.4.8.3 for connector, pin-out and setup information.
The communications (baud) rate and protocol parameters are incorrectly configured.
Refer to Sections 3.4.8.3 and 5.1.5 for baud rate information.
The COMM port communications mode is set incorrectly (refer to Section 5.1.4).
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
pin on the STATUS connector to the A pin on
pin on the STATUS connector to the B pin on
06807A(DCNxxxx)
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