MKS 670B - Y-Cable 25-pin Female Connector Pinout

Troubleshooting Cha
p
ter Ei
g
ht: Maintenance and Troubleshootin
g
132
Troubleshooting Chart
Before continuing to use the troubleshooting chart, verify that all vacuum fittings are tight and
that the transducer is properly pumped down below its resolution. Low range absolute
transducers (100 mmHg and below) will be overranged at atmospheric pressure.
Does the SYS CHK (System Check) read
properly? The readin
g
should be between
9.5 and 10.5 Volts.
Problem is in the
sensor mechanics
YES
Problem may be in the sensor
electronics, the cable, or the 670.
Perform Test A. Does it pass?
Problem is in the
sensor electronics
YES
Problem may be the cable or the 670.
Perform Test B. Does it pass?
Problem is in the 670. Press the
CAL key, enter the F.S. screen, and
press ENTER. Does it work properly?
Problem is internal to the 670.
Call MKS to receive an ERA
number and return the unit.
Problem is in the
sensor cable
YES
YES
NO
NO
NO
NO
Problem is in the input
circuits of the 670. Call
MKS to receive an ERA
number and return the unit.
Figure 18: Troubleshooting Flow Chart
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