Relay Board Status Led's; Figure 11-4: Location Of Relay Board Status Led's - Teledyne 400E Instruction Manual

Model 400E Ozone Analyzer
Instruction Manual

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
The most important is D1, which indicates the health of the I
LED Function
2
D1 I
(Red) (Watchdog
Circuit)
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.
P/N 04316 Rev: B
2
C Bus Watchdog Status LED's
Fault Status
C bus Health Continuously ON
or
Continuously
OFF

Figure 11-4: Location of Relay Board Status LED's

TROUBLESHOOTING & REPAIR PROCEDURES
Indicated Failure(s)
Failed/Halted CPU
Faulty Mother Board, Keyboard or Relay Board
Faulty Connectors/Wiring between Mother Board,
Keyboard or Relay Board
Failed/Faulty +5 VDC Power Supply (PS1)
UV Lamp Heater
O3 Gen Heater
Sample/Cal Valve
Measure/Reference Valve
Zero/Span Valve
Metal Wool Scrubber Heater
I2C Watchdog LED
2
C bus.
251