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Teledyne API - Model 200EH/EM Operation Manual Troubleshooting & Repair
237
Table 11-2: Relay Board Status LEDs
LED COLOR FUNCTION
FAULT
STATUS
INDICATED FAILURE(S)
LED ROW 1
D1 Red
Watchdog Circuit; I
2
C bus
operation.
Continuously
ON or OFF
Failed or halted CPU; faulty motherboard,
keyboard, relay board; wiring between
motherboard, keyboard or relay board; +5
V power supply
D2
Yellow Relay 0 - reaction cell heater
Continuously
ON or OFF
Heater broken, thermistor broken
D3 Yellow Relay 1 - NO
2
converter heater
Continuously
ON or OFF
Heater broken, thermocouple broken
D4
Yellow Relay 2 - manifold heater
Continuously
ON or OFF
Heater broken, thermistor broken
D7
1
Green Valve 0 - zero/span valve status
Continuously
ON or OFF
Valve broken or stuck, valve driver chip
broken
D8
1
Green Valve 1 - sample/cal valve status
Continuously
ON or OFF
Valve broken or stuck, valve driver chip
broken
D9
Green Valve 2 - auto-zero valve status
Continuously
ON or OFF
Valve broken or stuck, valve driver chip
broken
D10 Green Valve 3 - NO/NO
x
valve status
Continuously
ON or OFF
Valve broken or stuck, valve driver chip
broken
LED ROW 2
D5 Yellow Relay 3 - IZS heater
Continuously
ON or OFF
Heater broken, thermistor broken
D6 Yellow
Relay 4 – (O
2
sensor heater
200EH/EM)
N/A N/A
D11- 16 Green Spare N/A N/A
1
Only active for instruments with Z/S valve options installed
To enter the signal I/O test mode to manually control I/O functions such as valves and heaters, press the
following keys while observing the relay board LEDs when toggling:
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TST TST > CAL SETUP
SETUP X.X PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SETUP X.X SECONDARY SETUP MENU
COMM VARS DIAG ALRM EXIT
SETUP X.X ENTER PASSWORD:818
8 1 8 ENTREXIT
DIAG SIGNAL I/O
NEXT ENTR EXIT
DIAG I/O 0) EXT_ZERO_CAL =OFF
NEXT JUMP ENTR EXIT
DIAG I/O JUMP TO:0
0 0 ENTREXIT
DIAG I/O JUMP TO:25
0 7 ENTREXIT
DIAG AIO 25) RELAY_WATCHDOG=ON
PREV NEXT JUMP ON PRNT EXIT
Enter 07 to Jump
to Signal 7:
(CAL_LED)
Toggle this Key to
turn the CAL LED
ON/OFF
See Menu Tree
A-6 in Appendix
A.1 for a list of
I/O Signals
04521C (DCN5731)