C-1
APPENDIX C
SCHEMATICS
This appendix contains the schematics for the standard and optional printed circuit
boards contained in the Model 48C. Always turn off the instrument and unplug the
power cord before removing any printed circuit board. For more information about
appropriate safety precautions, see Chapter 7, “Servicing.” A description of each
board can be found in Chapter 8, “Theory of Operation.”
PC Board Schematic No. Part No. Page
Motherboard 42P939 9831 C-2
Pushbutton Board 1 93P906 9950 C-3
Pushbutton Board 2 93P906 9952 C-3
Processor Board 93P907 9837 C-4
Analog/Digital Board 42P941 8331 C-5
Digital/Analog Board 93P908 9839 C-6
Power Supply Board 42P940 8931 C-7
Preamplifier 42P948 8938 C-8
Input Board 42P936 9989 C-9
Bias Power Supply Board 42P938 8933 C-10
Temperature Control Board 42P937 8935 C-11
C-Link Board 93P914 9843 C-12
4-20 mA Outputs (optional) 93P912 9954 C-13
Input/Output Board (optional) 93P913 9956 C-14
Rear Connector Interface Board 93P915 9903 C-15
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