Panametrics DigitalFlow GM868, Service Manual

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DigitalFlow™ GM868 Service Manual 49
Appendix B. Optional Enclosures
B.7.2 Circuit Board Installation
Refer to Figure 11 on page 52 and complete the following steps:
1. Position the new printed circuit board within the electronics console so that it rests on the six standoffs in the
base of the enclosure and the option card sockets are located near the rear of the enclosure. Secure the circuit
board in place with the six screws previously removed.
2. Connect the flat LCD DISPLAY CABLE connector to terminal J52 near the option card sockets. Make sure the
marked pin #1 side of the cable connector is located nearer the front of the enclosure.
3. Connect the twisted-pair DISPLAY BACKLIGHT cable to connector J2 beneath the left side of the printed circuit
board. This connector is polarized and can only be installed with the red wire closer to the rear of the enclosure.
4. Connect the flat KEYPAD CABLE connector to terminal J50 near the front of the printed circuit board. Make sure
the marked pin #1 side of the cable connector is located nearer the rear of the enclosure.
5. Install the RS232, ANALOG OUT and TRANSDUCER connectors onto the printed circuit board at the locations indi -
cated in Figure 11 on page 52. Make sure the marked pin #1 sides of the connectors face the right side (keypad
side) of the enclosure.
Note: If any leads have come loose from the screw terminals on these connectors, refer to Appendix C, Optional
Enclosures , of the Startup Guide for wiring instructions.
6. Reconnect the main POWER LEADS to the screw terminals at the rear of the printed circuit board. When properly
installed, the lead colors should be green, white and black, from left to right (as viewed from the front of the
enclosure).
7. Reinstall all option cards, as described earlier in this chapter. Insert all external option card connectors at the rear
panel of the meter.
8. After checking for any loose hardware that may have fallen into the enclosure, reinstall the top panel on the
meter and secure the panel in place with the four screws previously removed.
The Model GM868 flowmeter may now be placed back into service. Reconnect the main power and refer to Chapter
2,
Initial Setup, of the Startup Guide and Chapter 1, Calibration, of this Service Manual for instructions on properly
setting up the meter for accurate flow rate measurements.
Note:
Be sure to record the printed circuit board replacement in Appendix A, Service Record.