Section 9: Series 3700 Module Schematics and Connections
Series 3700 System Switch/Multimeter User's Manual
9-24
3700S-900-01 Rev. C / July 2008
Model 3721: AMPS channels fuse replacement
Channels 41 and 42 are protected by series fuses. In the event of an overload,
both channels and the DMM input are protected. The two fuses are replaceable
and are located on the printed circuit board of the Model 3721 switch card. The
Model 3721 must be removed from the Series 3700 and all power disconnected
in order to access these fuses.
Amps channel fuse replacement procedure
WARNING
Disconnect all external power from the equipment and the
line cord before performing any maintenance on the Series
3700.
Make sure 3721 card is removed from the system before
replacing the AMPS fuse.
CAUTION
Do not use a fuse with a higher current rating than specified or
instrument damage can occur. If the Instrument repeatedly
blows fuses, locate and correct the cause of trouble before
replacing the fuse.
1. Remove the top shield cover:
Unscrew the number 4-40 screw (1) as shown in the "Shield removal"
figure below.
Slide the top cover in a direction away from the D-sub connectors,
disengaging the cover from the printed circuit board.
Lift the top shield cover off of the printed circuit board.
2. Set jumpers per options listed below.
3. Replace the top shield cover.
Slide the top cover in a direction toward the D-sub connectors, engaging
the cover onto the printed circuit board, and securing with the number 4-
40 screw (1).
4. The card can now be returned to service.
