Troubleshooting With Power Distribution Board Status Leds; Figure 8-2. Power Distribution Board Status Leds Used For Troubleshooting; Table 8-5. Power Distribution Board Status Led Failure Indications - Teledyne T750 User Manual

Troubleshooting with Power Distribution Board Status LEDs

Figure 8-2. Power Distribution Board Status LEDs Used for Troubleshooting

Table 8-5. Power Distribution Board Status LED Failure Indications

LED INDICATES
D6 GPT Valve Status
D7 Photometer Meas/Ref Valve
D8 O Generator Valve Status
3
D10 Cal Gas Status
D13 Diluent Valve Status
D9 O Photometer Pump Status
3
D15
Photometer Heater Status
Green
D16
O Generator Heater Status
3
Green
D1 = Watchdog; D2 thru D5, D11, D12, D14 = Spares
083730750B DCN8606
ACTIVATED BY
DIGITAL OUTPUT
GPT_VALVE
Valve should audibly change states. If not:
• Failed Valve
Photo Ref Valve
• Failed Relay Drive IC on Relay PCA
O3 Gen Valve
• Failed Relay PCA
Cylinder Valve
• Faulty +12 VDC Supply (PS2)
Faulty Connectors/Wiring
Input Valve
Pump should start /stop. If not:
• Failed pump
• Failed Drive IC on Power distribution
O3 Pump On
• Failed Power distribution board
• Faulty +12 VDC Supply
• Faulty Connectors/Wiring
Voltage displayed should change. If not:
Photo Lamp Heater
• Failed Heater
• Faulty Temperature Sensor
• Failed AC Relay
O3 Gen Lamp Heater
• Faulty Connectors/Wiring
DIAGNOSTIC TECHNIQUE
board
139