Troubleshooting
Connector Pin Descriptions
Thermo Electron Corporation Model 42i Low Source Instruction Manual 6-13
3 AC-Ground
AC 24VPWR PJ2 1 AC-HOT
2AC-NEUT
3 AC-Ground
AC INTF BD PJ3 1 AC-HOT
2AC-NEUT
3 AC-Ground
Table 6-4. Measurement Interface Board Connector Pin Descriptions
Connector
Label
Reference
Designator
Pin Signal
Description
DATA IPJ8 1 Ground
2 +RS485 from Motherboard
3 -RS485 from Motherboard
PRES MJ3 1 Pressure Sensor Input
2 Ground
3 +15V
4 -15V
INPUT BD MJ8 1 +15V
2 Ground
3 -15V
4 +5V
5 Ground
6 Measurement Frequency Output
7 Amplifier Zero Adjust Voltage
8 SPI Output
9 SPI Clock
10 SPI Board Select
AMB TEMP MJ9 1 Ambient Temperature Thermistor
2 Ground
HVPS MJ10 1 HV Power Supply Voltage Adjust
2 Ground
Table 6-3. Motherboard Connector Pin Descriptions, continued
Connector
Label
Reference
Designator
Pin Signal Descriptions
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