Teledyne Model 300EU manual Fault Diagnosis With Test Functions, M300EU, table continued, Rev A1

TROUBLESHOOTING & REPAIR	M300EU
	Addendum to M300E/EM Manual P/N 04288

11.2.1. FAULT DIAGNOSIS WITH TEST FUNCTIONS

The following table supersedes Table 11.2 of the M300E/EM Operators Manual (P/N 04288).

Table 11-2: Test Functions - Indicated Failures

TEST

FUNCTIONS

(As Displayed)

TIME

RANGE

STABIL

CO MEAS

&

CO REF

MR RATIO

PRES

SAMPLE FL

SAMPLE

TEMP

BENCH TEMP

WHEEL TEMP

BOX TEMP

OVEN TEMP

(table continued)

INDICATED FAILURE(S)

Time of day clock is too fast or slow

To adjust See Section 6.6of the M300E/EM Operators Manual (P/N 04288). Battery in clock chip on CPU board may be dead.

Incorrectly configured measurement range(s) could cause response problems with a Data logger or chart recorder attached to one of the analog output.

If the Range selected is too small, the recording device will over range.

If the Range is too big, the device will show minimal or no apparent change in readings.

Indicates noise level of instrument or CO concentration of sample gas (See Section 11.4.2 of the M300E/EM Operators Manual for causes).

If the value displayed is too high the IR Source has become brighter. Adjust the variable gain potentiometer on the sync/demod board (See Section 11.6.3 of the M300E/EM Operators Manual)

If the value displayed is too low or constantly changing and the CO REF is OK:

oFailed multiplexer on the mother board o Failed sync/demod board

o Loose connector or wiring on sync/demod board

If the value displayed is too low or constantly changing and the CO REF is BAD:

oGFC wheel stopped or rotation is too slow o Failed sync/demod board IR source

o Failed IR source o Failed relay board o Failed I2C buss

o Failed IR photo-detector

When the analyzer is sampling zero air and the ratio is too low:

oThe reference cell of the GFC wheel is contaminated or leaking.

oThe alignment between the GFC wheel and the segment sensor, the M/R sensor or both is incorrect. o Failed sync/demod board

When the analyzer is sampling zero air and the ratio is too high:

oZero air is contaminated o Failed IR photo-detector

See Table 11-1for SAMPLE PRES WARN

Check for gas flow problems. see Section 11.1.6 of the M300E/EM Operators Manual)

SAMPLE TEMP should be close to BENCH TEMP. Temperatures outside of the specified range or oscillating temperatures are cause for concern

Bench temp control improves instrument noise, stability and drift. Temperatures outside of the specified range or oscillating temperatures are cause for concern. See Table 11-1for BENCH TEMP WARNING

Wheel temp control improves instrument noise, stability and drift. Outside of set point or oscillating temperatures are causes for concern. See Table 11-1for WHEEL TEMP WARNING

If the box temperature is out of range:

oCheck the motherboard stabilization fan (see Figure 3-1). o See Table 11-1for BOX TEMP WARNING.

If the oven is temperature is out of range, check both of the oven heater fans in the power supply module. Areas to the side and rear of instrument should allow adequate ventilation.

oCheck the both of the oven fans (see Figure 3-1). o Check both of the oven heaters.

See Table 11-1for OVEN TEMP WARNING.

62 05514 Rev A1