Teledyne 360E 11.5.5. Relay Board , 11.5.6. Sensor Assembly

Model 360E Instruction Manual TROUBLESHOOTING & REPAIR PROCEDURES

11.5.5. Relay Board

The relay board PCA (04135) can be most easily checked by observing the condition of the its status LEDs on

the relay board, as described in Section 11.1.4.3, and the associated output when toggled on and off through

signal I/O function in the diagnostic menu, See Section 11.1.3.

1. If the front panel display responds to key presses and D1 on the relay board is NOT flashing then either

the wiring between the Keyboard and the relay board is bad, or the relay board is bad.

2. If D1 on the relay board is flashing and the status indicator for the output in question (heater power,

valve drive, etc.) toggles properly using the signal I/O function, then the associated control device on the

relay board is bad. Several of the control devices are in sockets and can be easily replaced. The table

below lists the control device associated with a particular function:

Table 11-8: Relay Board Control Devices

FUNCTION CONTROL

DEVICE IN SOCKET

Wheel Heater K1 Yes

Bench Heater K2 Yes

Spare AC Control K3 Yes

IZS Valves U4 Yes

IR Source Drive U5 No

The IR source drive output can be verified by measuring the voltage at J16 with the IR source disconnected. It

should be 11.5± 0.5 VDC.

11.5.6. Sensor Assembly

To verify that the Sync/Demodulator Assembly is working follow the procedure below:

1. Verify that D1 and D2 are flashing (they flash at different rates, see Table 11-3).

 If not check the opto pickup assembly, Section 11.5.6.2 and the GFC wheel drive, Section 11.5.6.3.

 If the wheel drive and opto pickup are working properly then verify that there is 2.4 ±0.1 VAC and

2.5 ±0.15 VDC between digital ground and TP 5 on the sync demod board. If not then check the

wiring between the sync/demod and opto pickup assembly (see interconnect drawing 04216). If

good then the sync/demod board is bad.

2. Verify that the IR source is operating, Section 11.5.6.4.

3. With the analyzer connected to zero air, measure between TP11 (measure) and analog ground, and

TP12 (reference) and analog ground.

 If they are similar to values recorded on the factory data sheet then there is likely a problem with the

wiring or the A/D converter.

 If they are not then either the sync demodulator board or the IR-photodetector are bad. See Section

11.4.1.4 for problems with the IR-photodetector TEC drive.

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