SECTION IX
9.0 HUB COVER AND P.C. BOARD REPLACEMENT
To replace the turning drum hub cover and P. C. Board, follow the steps outlined below:
9.1 Remove the six machine screws from the hub cover, and extract cover, gasket and P.C. Board.
9.2 Unplug battery cap.
9.3 Unsolder wires that go to small horn (Note that these wire originate from same strip that
connects battery cap).
9.4 Now carefully examine three conductor strips that originate at upper right hand corner of P.C.
board. These wires may not be the same color code as the replacements hub P.C. Board and it
is important that they be connected to the correct points. Note that one wire (ground) has a
terminal lug attached and therefore replaces the previous wire with terminal lug.
9.5 Now make a note of the wires that go to top and bottom splices of outer tape conductors. One
of these wires goes to a point on P.C. Board Labeled "+V". The other to a point on P.C.
Board labeled "SIG". Note which goes to top and which goes to bottom conductor. For
example: "SIG" to top connector and "+V" to bottom connector.
9.6 Unsolder spliced conductors and remove the nut ground connecting the gauging tape to the
driving drum. This now completes disassembly and the old hub assembly can be put aside.
9.7 Position new hub cover and P.C. Board and solder to horn and insulate the two free wires
originating from the battery cap strip line. The polarity of these two wires is not important.
9.8 Reconnect ground wire with terminal lug to driving drum ground post and replace and tighten
nut.
9.9 Re-solder and insulate “+V” and "SIG" wire to outer tape conductors taking careful notice
of where they originated. (see Step 10.5 above)
9.10 Replace battery and connect battery cap.
9.11 Re-assemble hub cover and attached P. C. Board with six machine screws being careful to
line up neoprene gasket.
9.12 Perform temperature calibration in accordance with Section VII.
.
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