PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 78
5.1.2.4 REAR FITTING REMOVAL AND REPLACEMENT
Electric shock hazard exists when performing this procedure. Following the
outlined procedure exactly is required. Disconnect power and pressure prior
to any disassembly.
1. Remove adaptor fittings from rear panel fittings (fig 11)
2. Remove top and bottom panels. (fig 7)
3. Remove rear panel. (fig 4)
3.1. Disconnect two (2) ribbon cables P/N 401278 (W4), (W3) (fig 1) at rear
panel board P/N 40168 (fig 4).
3.2. Disconnect fan motor cable at position P3 (fig 1).
3.3. Disconnect AC power leads (three each) from rear of power entry/filter
module P/N 102417 (fig 4).
Annotate wire position on power entry module using wire color code.
3.4. Remove five (5) mounting screws securing the rear panel to the
instrument (fig 11).
3.5. Remove rear panel.
4. Remove and replace fitting to be replaced (figs 2, 3, 5 and 6).
5. Reassemble in reverse of disassembly.
When reattaching the AC power leads to the power entry/filter module, ensure
the leads are connected to the correct pins. Attaching the earth lead to the live
AC connector will result in damage to the instrument and possible electric shock.
5.1.2.5 POWER SUPPLY REMOVAL
See Figures .8, .7 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).
Notice that there are two power supplies (12 V and + 5, 15 V).
Remove only the defective part.
3. Remove connecting cables (fig. 8)
3.1. one connector on ether end of power supply.
Remember to mark cables so they go back to the correct power supply.
4. Remove power supply (fig. 8)
4.1. Remove four screws holding the power supply (100550-Z).
5. Install new or repaired part.
6. Reassemble unit using this instructions as a guide.
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