4700 Refrigerated Sampler Service Guide
Section 4 CPU and Power Supply
4-6
4.2 Test Points
Test points and their values for the 4700 CPU are listed below in
Table 4-1. See the schematic diagram in Figure A-5, Appendix A,
which shows their board connections in red for easier viewing.
Table 4-1 Test Point Functions and Values
Test Point
Function
Value
TP1
2.5V reference voltage
2.462 to 2.538 volts (1.5% accuracy)
TP2
Home output from distributor stepper
motor driver
Goes low when both phases are being driven at 70.7%.
TP3
Liquid Detect after filter
This is the filtered AC signal from the liquid detector.
TP4
Liquid Detect A-D input on the processor With liquid present, this value should be above 0.75V.
TP5
–3.3V voltage
–2.9 to –3.3 volts
TP6
MCKO (Master Clock Output): This out-
put is enabled when in the CPU board
test mode (TEST command through the
serial port). See Section 4.3.
8 MHz signal (125 nsec period)
TP7
TP8
TP9
VB – power to RAM
About 2.7V on battery, 3.3V on AC power
2.5V minimum.
TP10
Battery current minus
Should be less than 3µA. Best measured with 12V
power completely disconnected. Reading may depend
on meter used.
TP11
Load current on lithium battery.
TP12
Power Fail input to CPU
Goes low when 12V power to board falls to about 8
volts.
TP13
RS232 Invalid output
If a valid RS232 signal is present on any receiver input,
this output will be high.
TP14
Analog input pulses
About 1200 Hz (0.8 ms period) at 10 mA input.
TP15
Ground. Return for TP14.
TP16
TP17
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