Rear Panel Controls
Chapter Three: Overview
30
HEAD Connector
This 15-pin female Type “D” connector connects the cable from the 270 instrument to a pressure
sensor. Refer to Table 8 for the pin assignments.
HEAD Connector (J403) Pinout
Pin Number
Description
1
Chassis Ground
2
Analog Common
3
Heater Return
4
Mux Input
5
No Connection
6
Signal Return
7
Signal Input
8
+ Heater
9
-13 V
10
+13 V
11
No Connection
12
No Connection
13
Preamp
14
System Check
15
Oscillator
Table 8: HEAD Connector (J403) Pinout
Power Entry Module
This module contains the:
•
RFI power line filter
•
IEC power line connector
•
Line Voltage selector
•
Power line fuses (2)
For information on the Line Voltage selector, refer to How to Change the Line Voltage Selection,
page 40. The Maintenance section, page 46, discusses the types of fuses used, and how to
replace them.
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