User manual

Section 16: Maintenance Series 3700 System Switch/Multimeter Reference Manual
16-2 3700S-901-01 Rev. C / July 2008
WARNING Disconnect all external power from the equipment and the
line cord before performing any maintenance on the Series
3700.
Failure to disconnect all power may expose you to
hazardous voltages, that if contacted, could cause personal
injury or death. Use appropriate safety precautions when
working with hazardous voltages.
Figure 16-1: Fuse location
Fuse
location
Rating
Keithley Instruments part
number
(1) Analog
backplane
fuse
250V, 3A fast blow 5x20mm
FU-99-1
(2) Instrument
fuse
250V / 1.25A slow blow
5x20mm
FU-106-1.25
To replace a fuse:
1. Using a flat-tip screwdriver, disengage the fuse holder by rotating it counter-
clockwise.
2. Pull out the fuse holder and replace the fuse with the correct type (see
table).
3. Reinstall the fuse holder.
If the fuse continues to blow, a circuit malfunction exists and must be corrected.
Return the unit to Keithley Instruments for repair.