Sensor Assembly; Table 11-6: Relay Board Control Devices - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual
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.
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:
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

11.5.6.1. Sync/Demodulator Assembly
To verify that the Sync/Demodulator Assembly is working follow the procedure
below:
1. Verify that D1 and D2 are flashing.
If not check the Opto Pickup assembly, Section 11.5.6.2 and the GFC
§
Wheel Drive, Section 0.
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.
P/N 04288 REV: A

Table 11-6: Relay Board Control Devices

Function
Wheel Heater
Bench Heater
Spare AC Control
IZS Valves
IR Source Drive
TROUBLESHOOTING & REPAIR PROCEDURES
Control
In Socket
Device
K1
K2
K3
U4
U5
Yes
Yes
Yes
Yes
No
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