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18-6
5.
6.
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7.
8.
9.
Replacing Model 7751/7752/7753 plug-in module fuses
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1.
2.
3.
4.
5.
6.
De-solder the blown CH41 or CH42 fuse as required, taking care not to damage the
circuit board or spread solder flux around the board.
Install a new 3A, 250V fast-blow fuse, Keithley part number FU-107-1.
Do not use a fuse with a higher current rating than specified or module
damage may occur.
Solder the new fuse in place using organic (OA based) flux solder, again taking
care not to damage the circuit board or spread solder flux around the board.
Carefully clean the repaired area of the circuit board with a foam tipped swab or
brush dipped in pure water, then blow-dry the board with dry nitrogen gas. Allow
the board to dry for several hours in a 50°C low-humidity environment before use.
Re-install the circuit board into the plastic housing, then close the top cover.
The information in this section is intended only for qualified service
personnel. Do not perform these procedures unless you are qualified to
do so.
Make sure that all plug-in module connections are de-energized and
disconnected before replacing module fuses.
The four fuses located on the Model 7751/7752/7753 module are intend
to protect the airbag being tested from detonation in the event of cir-
cuit failure on the Model 7751/7752/7753. If one of these fuses blows, it
is likely that a circuit failure has occurred and the module must be
repaired before being used to test airbags.
Turn off the power and disconnect external connections from the
Model 7751/7752/7753.
Open the Model 7751/7752/7753 top cover.
Locate the fuses F1, F2, F3, and F4 (see
Remove the circuit board from the bottom plastic housing by removing the two
bottom screws.
De-solder the blown fuse as required, taking care not to damage the circuit board or
spread solder flux around the board.
Install a new 62mA surface-mount fuse, Keithley part number FU-124-1.
Model 2790 SourceMeter
Figure
®
Switch System Reference Manual
18-4).
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