DH Instruments PPC2 AF - Barometer Board Replacement; Cooling Fan Removal and Replacement

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 79 © 1998 DH Instruments, Inc.
5.1.2.6 BAROMETER BOARD REPLACEMENT
See Figures .1 and .7.
Remove all power and pressure prior to disassembly.
1. Remove top (fig. 7)
2. Remove two allen screws at diagonal corners on board (fig. 1) (ENG400461)
3. Carefully pull board out from connector.
Be careful not to damage pins on connector J1.
4. Install new board.
5. After re-assembly, power up the PPC2 AF.
6. The temperature coefficients must be input.
6.1. SPECIAL, DIAG, CALIB, TEMP,
6.2. Type in Addr. and Multi. if needed.
6.3. ENTER, type in Amb Pres Coef:
6.4. ENTER
7. A pressure adder and multiplier may be used if desired.
7.1. SPECIAL, INTERNAL, CAL, EDIT, BAROMETER
7.2. ENTER, type in PA and PM, ENTER.
5.1.2.7 COOLING FAN REMOVAL AND REPLACEMENT
See figures 7, 4 and 1.
Remove all power and pressure connections prior to any disassembly.
1. Remove top and bottom covers (fig. 7)
2. Remove left side panel (fig. 1)
2.1. Loosen eight allen screws on top and bottom side (101010-Z).
2.2. Slide the side up off the rails (100260).
3. Remove connecting cable (fig. 1)
3.1. One connector on circuit board (P3).
3.2. Push grommet down through slotted hole.
4. Remove cooling fan.
4.1. Remove four screws holding the fan in place. (100970-2)(fig. 4)
5. Install new fan.
6. Reassemble PPC2 AF.