Keithley 3730 User Manual

Section
9: Series 3700 Module Schematics and Connections Series 3700 System Switch/Multimeter
User's Manual
9
-18 Document Number: 3700S-900-
01 Rev. A / August 2007
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 may 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 #4-40 screw (1) as shown in the "Model 3721 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. Replace the fuses:
 The fuse locations for channels 41 and 42 are shown in the "Model 3721 fuse location" figure
below.
 Gently lift out the old fuse from the fuse holders. Holders are labeled FH1A-FH1B for Channel
41, and FH2A-FH2B for Channel 42. Pull the fuse away from the PCB and it should snap out
of the holders.
 Place the new fuse by gently pushing it downwards towards the PCB into the fuse holders. It
should snap into the holder on each side. Make sure that the fuse body is inline with the
holders before applying force. Do not use excessive force. Check that the fuse is contacting
each holder.
 Discard the old fuse.
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 #4-40 screw (1).
4. The card may now be returned to service.

Keithley 3730 Specifications

General

Brand	Keithley
Model	3730
Category	Multimeter
Language	English