Assembling The New Ubb Baseboard; Disassembling The Existing Baseboard - Troxler 3401 Installation Procedures Manual

Disassembling the existing baseboard:

1. Turn off the gauge and place the gauge on a
standard block. Remove the top shell,
disconnect the batteries, discharge the high
voltage and remove the existing baseboard
and metal plate assembly.
2. Remove the He3 tube from the assembly by
removing the curved support bracket and
then pulling the tube downward away from
the baseboard.
3. Use a 5/16 nut driver to remove the screws
securing the GM tube holders.
tube holders are slotted and are held by the
metal plate. One end of the GM tube holder
will still be connected to the baseboard by
soldered resistors. Slide off the other one
and remove the tubes. Figs 1, 2 and 3.
4. Do not discard the copper grounding
springs, as they are needed with the new
UBB assembly.
5. The nylon spring supports and small coil
springs are located in the resistor connected
end of the GM tubes and may drop out if the
tube is turned downward during removal.
Save these.
6. Separate the metal base plate from the
baseboard by removing the screws on the
top of the baseboard.
7. Slide the metal base plate off the remaining
GM tube holder.
8. From the top of the board, use a de-
soldering tool to disconnect the resistors
from the baseboard. This will allow you to
remove the remaining GM tube holder from
the old baseboard.
9. You are now ready to assemble your new
UBB board.

Assembling the new UBB baseboard:

1. Remove the metal cover from the UBB by
removing the screws.
2. Locate the 3 groups of jumpers on the UBB.
Fig 5.
Fig.3
The GM
Reuse these parts
2
Fig. 5
Fig.6