Teledyne Carbon Monoxide Analyzer 300 User Manual download pdf (Page 91)

absence of these actions will usually indicate either a CPU or Display failure. To

determine which module is defective, perform the following procedure:

1. Turn off power.

2. Remove the ribbon cable from the CPU board to the Display;

3. Turn Power on.

4. A cursor character should appear in the upper left corner of the display. If

it does not, the display is defective and should be replaced. If the cursor

does appear, it is probable that the CPU is faulty.

10.2.3 Checking the keyboard

During normal Analyzer operation, depressing the right most key of the keyboard should

cause a change of display modes. If it does not, check:

- Cable connections;

- CPU and Display operation (see Section 10.2.2)

If these checks are satisfactory, it is probable that the keyboard is defective and should be

replaced.

10.3 Troubleshooting using warning messages

The most common and/or serious instrument failures will result in a warning message (or

messages) being displayed on the front panel. Table 10-1 below lists the warning

messages which the Analyzer may display, along with their meaning and the

recommended corrective action. It should be noted that if multiple (more than 2 or 3)

warning messages occur at the same time, it is often an indication that some fundamental

analyzer sub-system (power supply, V/F board, CPU) has failed rather than an indication

of the multiple failures referenced by the warnings. In this situation, it is recommended

that proper operation of power supplies (see Section 10.6.4) and the V/F Board (see

Section 10.6.3) be confirmed before addressing the specific warning messages.

WARNING MESSAGES

Warning Message Meaning Corrective Action

SOURCE WARNING The CO REF value is

greater than 5000 mV or

less than 2500 mV

Check and adjust the

Sync Demodulator and

optical alignment as

described in Section

10.6.6 and 10.6.8

SYNC ERROR No modulation is present

on the output of the IR

detector.

Check IR source, IR

detector/pre-amp, and

Opto interrupter

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Teledyne Carbon Monoxide Analyzer 300 User Manual Page 91