Teledyne T200, Руководство по эксплуатации, Страница: 259 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Troubleshooting & Service
257

If a modem is being used, additional configuration and wiring rules must be
observed. See Section 8.3

Incorrect setting of the DTE – DCE Switch. See Section 6.1 to set correctly.

Verify that cable (P/N 03596) that connects the serial COM ports of the CPU to J12
of the motherboard is properly seated.
12.7.9.2. TROUBLESHOOTING ANALYZER/MODEM OR TERMINAL OPERATION
These are the general steps for troubleshooting problems with a modem connected to a
Teledyne API's analyzer.
1. Check cables for proper connection to the modem, terminal or computer.
2. Check to ensure that the DTE-DCE is in the correct position as described in
Section 6.1.
3. Check to ensure that the set up command is correct (see Section 8.3).
4. Verify that the Ready to Send (RTS) signal is at logic high. The T200 sets pin 7
(RTS) to greater than 3 volts to enable modem transmission.
5. Ensure that the BAUD rate, word length, and stop bit settings between modem and
analyzer match. See Section 6.2.2.
6. Use the RS-232 test function to send “w” characters to the modem, terminal or
computer. See Section 6.2.3.
7. Get your terminal, modem or computer to transmit data to the analyzer (holding
down the space bar is one way); the green LED should flicker as the instrument is
receiving data.
8. Ensure that the communications software or terminal emulation software is
functioning properly.
Note
Further help with serial communications is available in a separate manual ―RS-
232 Program
ming Notes‖ Teledyne API's P/N 01350.
12.7.10. NO2

NO CONVERTER
Provided that oxygen was present in the Sample stream during operation for the NO
2
converter to function properly, the NO
2
converter assembly can fail in two ways:

An electrical failure of the band heater and/or the thermocouple control circuit and;

A performance failure of the converter itself.
12.7.10.1. NO
2

NO CONVERTER ELECTRICAL SYSTEM
NO
2
converter heater failures can be divided into two possible problems:

Temperature is reported properly but heater does not heat to full temperature.

In this case, the heater is either disconnected or broken or the power relay is
broken.

Disconnect the heater cable coming from the relay board and measure
the resistance between any two of the three heater leads with a multi-
meter.

The resistance between A and B should be about 1000 Ω.
06858E DCN7057