Teledyne MODEL T703 Manual Do Utilizador
Teledyne API T703 Calibrator Operation Manual
General Troubleshooting & Repair
197
11.3. USING THE INTERNAL ELECTRONIC STATUS LEDS
Several LEDs are located inside the instrument to assist in determining if the calibrators CPU, I
2
C bus and Relay
PCA are functioning properly.
11.3.1. CPU STATUS INDICATOR
DS5, a red LED, that is located on upper portion of the motherboard, just to the right of the CPU board, flashes
when the CPU is running the main program loop. After power-up, approximately 30 – 60 seconds, DS5 should
flash on and off. If characters are written to the front panel display but DS5 does not flash then the program files
have become corrupted, contact customer service because it may be possible to recover operation of the
calibrator. If after 30 – 60 seconds neither DS5 is flashing and no characters have been written to the front
panel display then the CPU is bad and must be replaced.
when the CPU is running the main program loop. After power-up, approximately 30 – 60 seconds, DS5 should
flash on and off. If characters are written to the front panel display but DS5 does not flash then the program files
have become corrupted, contact customer service because it may be possible to recover operation of the
calibrator. If after 30 – 60 seconds neither DS5 is flashing and no characters have been written to the front
panel display then the CPU is bad and must be replaced.
Motherboard
CPU Status LED
Figure 11-2:
CPU Status Indicator
11.3.2. RELAY PCA STATUS LEDS
There are seven LEDs located on the Relay PCA. Some are not used on this model.
11.3.2.1. I
2
C Bus Watchdog Status LEDs
The most important is D1 (see, which indicates the health of the I
2
C bus.
Table 11-4: Relay PCA Watchdog LED Failure Indications
LED
Function
Fault Status
Indicated Failure(s)
D1
(Red)
(Red)
I
2
C bus Health
(Watchdog Circuit)
Continuously ON
or
Continuously OFF
or
Continuously OFF
Failed/Halted CPU
Faulty Motherboard or Relay PCA
Faulty Connectors/Wiring between Motherboard or Relay
PCA
Failed/Faulty +5 VDC Power Supply (PS1)
Faulty Motherboard or Relay PCA
Faulty Connectors/Wiring between Motherboard or Relay
PCA
Failed/Faulty +5 VDC Power Supply (PS1)
If D1 is blinking, then the other LEDs can be used in conjunction with DIAG Menu Signal I/O to identify hardware
failures of the relays and switches on the Relay.
failures of the relays and switches on the Relay.
07223B DCN6378