Routine Maintenance; Line Voltage Selection; Changing The Fuse; Changing The Battery - Keithley 7001 Instruction Manual

7.4

Routine maintenance

The following procedures summarize routine mainte-
nance for the Model 7001. These procedures require
disassembly of the instrument (also see paragraph 7.5).

7.4.1 Line voltage selection

The Model 7001 power supply board automatically ad-
justs to line voltage and frequency. There are no inter-
nal switches for this purpose.

7.4.2 Changing the fuse

WARNING
Disconnect the instrument from the
power line and all other equipment
before replacing the line fuse.
The Model 7001 uses a single fuse which is mounted on
the power supply board. This board is located on the
underside of the instrument, immediately beneath the
power switch pushrod.
Replacement of the fuse requires removal of the instru-
ment case. The snap-in fuse can be replaced without re-
moving the power supply board.
If the fuse should fail, try to determine the cause before
installing the replacement. The correct fuse type is as
follows:
Line voltage Type
5 × 20mm
All
CAUTION
Use only the speciÞed fuse type, or
instrument damage may occur.
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
Rating
250V, 2A - Fast Blow

7.4.3 Changing the battery

WARNING
Disconnect the instrument from the
power line and all other equipment
before changing the battery.
The volatile memories in the Model 7001 are protected
by a replaceable battery when power is off. Typical life
for the battery is approximately ten years. This battery
should be suspected if the instrument no longer retains
scan lists or other user-programmed operating param-
eters. If the battery is absent or totally exhausted, the
display will show the message "No Comm Link"
shortly after the Model 7001 is switched on. (This is just
one of the causes of the "No Comm Link" message. See
paragraphs 7.7.1 and 7.8.1 for more causes.)
The battery is a 3V wafer-type lithium cell, Duracell
type DL2450 or equivalent (Keithley part number BA-
44), which is located on the digital board.
Replacement of the memory back-up battery requires
removal of the instrument case, followed by removal of
the digital board and its shield. (See paragraph 7.5 for
the disassembly procedure.)
WARNING
The precautions below must be fol-
lowed to avoid possible personal in-
jury.
1. Wear safety glasses or goggles when working with
lithium batteries.
2. Do not short the battery terminals together.
3. Keep lithium batteries away from all liquids.
4. Do not attempt to recharge lithium batteries.
5. Observe proper polarity when inserting the bat-
tery into its holder.
6. Do not incinerate or otherwise expose the battery
to excessive heat (>60°C).
7. Bulk quantities of lithium batteries should be dis-
posed of as a hazardous waste.
Maintenance
7-3