Routine Maintenance; Introduction; Line Voltage Selection; Line Fuse Replacement - Keithley 6517 Service Manual

4.1

Introduction

The information in this section deals with routine type main-
tenance that can be performed by the operator. This informa-
tion is arranged as follows:
4.2 Line voltage selection: Describes how to select the
correct line voltage.
4.3 Line fuse replacement: Explains how to replace a
blown power line fuse.
4.4 INPUT connector cleaning: Discusses how to clean
the INPUT jack should its insulators become
contaminated.
4.5 Firmware updates: Recommends a course of action
for firmware updates provided by Keithley.
4.2

Line voltage selection

The operating voltage is selected using the rear panel
SELECTED LINE VOLTAGE switch (see Figure 4-1).
Before connecting the Model 6517A to line power, be sure
that line voltage selection switch is set for the correct voltage
as marked on the rear panel. Settings are as follows:
• 115V: 105-125V (90-110V)
• 230V: 210V-250V (180-220V)
CAUTION
Operating the Model 6517A on an incor-
rect line voltage may result in instru-
ment damage. If the line voltage setting
is changed, the line fuse will also require
replacement. See paragraph 4.3.

Routine Maintenance

4.3

Line fuse replacement

Disconnect the line cord at the rear
panel, and remove all test leads con-
nected to the instrument (front and
rear) before replacing the line fuse.
The power line fuse is accessible from the rear panel, just
below the AC power receptacle (see Figure 4-1). Perform the
following steps to replace the line fuse:
1. Insert a flat-bladed screwdriver into the slot of the fuse
carrier.
2. While pushing in, turn the screwdriver counterclock-
wise until the spring-loaded fuse carrier releases from
the fuse holder.
3. Pull out the fuse carrier and replace the fuse with the
type specified in Table 4-1.
To prevent instrument damage, use only
the fuse type specified in Table 4-1.
4. Reinstall the fuse carrier.
If the power line fuse continues to blow, a
circuit malfunction exists and must be cor-
rected. Refer to the troubleshooting sec-
tion of this manual for additional
information.
WARNING
CAUTION
NOTE
4
4-1