Veris Technologies pH Manager - Operating Instructions - Manual (Page 59)

Pub.# OM17-MSP-pH
6-14
3. Testing continuity from the circuit board through the communication cable
a) Remove the steel cover and unscrew the plastic lid from the external Controller.
b) Look for the brown Molex 3-pin connector circled in Figure 4. The color sequence
(left->right) should be white-green-black. CAREFULLY wiggle each wire to check for
a loose connection.
c) Check continuity between the following pins:
Figure 3.4 Brown Molex connector on circuit board (POWER MUST BE DISCONNECTED
BEFORE TESTING)
d) Check continuity from brown Molex connector to 9 pin serial connector; this tests
continuity from the circuit board to the DataLogger or PC. (Figure 5)
Figure 3.5 Testing continuity from Molex connector to serial connector
Molex Connector 4-pin connector 9 pin serial connector
White 2 3
Green 1 2
Black 3 5