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Model 400E Ozone Analyzer
Instruction Manual
TROUBLESHOOTING & REPAIR PROCEDURES
P/N 04316 Rev: B
251
11.1.5.
Relay Board Status LED'S
There are sixteen LED’s located on the Relay Board. Some are not used on this
model.
11.1.5.1.
I
2
C Bus Watchdog Status LED’s
The most important is D1, which indicates the health of the I
2
C bus.
LED
Function
Fault Status
Indicated Failure(s)
D1
(Red)
I
2
C bus Health
(Watchdog
Circuit)
Continuously ON
or
Continuously
OFF
Failed/Halted CPU
Faulty Mother Board, Keyboard or Relay Board
Faulty Connectors/Wiring between Mother Board,
Keyboard or Relay Board
Failed/5 VDC Power Supply (PS1)
If D1 is blinking, then the other LED’s can be used in conjunction with
DIAG
Menu
Signal I/O to identify hardware failures of the relays and switches on the Relay.
Zero/Span Valve
Measure/Reference Valve
Sample/Cal Valve
UV Lamp Heater
O3 Gen Heater
Metal Wool Scrubber Heater
I2C Watchdog LED
Figure 11-4: Location of Relay Board Status LED’s
Содержание 400E
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