Introduction; Line Fuse Replacement; Routine Maintenance - Keithley SourceMeter 3A 2420 Service Manual

3-2

Routine Maintenance

Introduction

The information in this section deals with routine type maintenance that can be performed by
the operator.

Line fuse replacement

WARNING
The power line fuse is accessible from the rear panel, just above the AC power receptacle (see
Figure 3-1).
Figure 3-1
Rear panel
75V
PEAK
4-WIRE
SENSE
Perform the following steps to replace the line fuse:
1.
2.
CAUTION
3.
Disconnect the line cord at the rear panel, and remove all test leads connect-
ed to the instrument (front and rear) before replacing the line fuse.
WARNING:
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
5V
HI
PK
V, Ω,
GUARD
5V
75V
5V
PEAK
PEAK
PEAK
GUARD
SENSE
LO
INPUT/
250V
OUTPUT
PEAK
IEEE-488
(ENTER IEEE ADDRESS
WITH FRONT PANEL MENU)
RS232
CAUTION:
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Carefully grasp and squeeze together the locking tabs that secure the fuse carrier to the
fuse holder.
Pull out the fuse carrier, and replace the fuse with the type specified in Table 3-1.
To prevent instrument damage, use only the fuse type specified in Table 3-1.
Re-install the fuse carrier.
MADE IN
U.S.A.
LINE FUSE
SLOWBLOW
3.15A, 250V
LINE RATING
90-250VAC
50, 60HZ
220VA MAX
TRIGGER
LINK
INTERLOCK-
DIGITAL I/O