GE Druck TRX-II User Manual page 52

2. When normally battery powered, check the contact springs for
corrosion and spring tension.
3. Check total battery voltage with a voltmeter. Alkaline should read
around 6 Volts and NiCd should read around 5 Volts when new or
fully charged.
4. Open the TRX-II as described in the previous paragraph and
check whether the PCB interconnecting plugs are still in position.
If the unit does not measure milliamps:
5. Check the fuse (accessible from the back). Replace fuse only by
Part No. 13119 or Little fuse, Part No. 217.400.
If the unit does not measure Ohms or RTD:
6. Check the fuse accessible from the back. Replace fuse only by
p/n 13119 or little fuse No.217.400
Most other fault symptoms are not logically related to just one
possible defect.
If spare printed circuit boards are available, you could replace board
by board to find the faulty board. Note that a board replacement
requires a recalibration. Note that this procedure may also create a
problem in a new healthy board by specific defects in an original
board.
The following boards are accommodated in the TRX-II:
Power supply board (Assy 201)
Processor board (Assy 200)
Measure board (Assy 202)
Source board (Assy 203)
Always place the EMI shielding back in the original position.
EN-42
IMPORTANT:
K319 Issue 2