Routine Maintenance
1-3
1.4 Fan filter cleaning
The Þlter for the cooling fan requires periodic cleaning
to maintain proper ventilation. The fan Þlter is accessi-
ble from the rear panel. Perform the following steps to
remove the Þlter for cleaning:
1. While facing the rear panel, locate the lower right-
hand corner of the Þlter cover plate.
2. At this corner, place a thin-bladed screwdriver be-
tween the cover plate and the rear panel and gently
pry the Þlter assembly away from the chassis.
The Þlter element is permanently Þxed to the cover
plate. Do not attempt to remove the Þlter element from
Figure 1-3
Rear AMPS input fuse location
Amps
Fuse
WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVIC
WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVIC
CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLA
CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLA
EXTERNAL
TRIGGER
INPUT
INPUT
1100V
PEAK
350V
PEAK
500V
PEAK
AMPS
2A MAX
AMPS
FUSE
2A, 250V
SENSE
Ω 4 WIRE
HI LO
!
OPTION SLOT
the cover plate.
WARNING
Exercise care when handling the Þl-
ter assembly. The Þlter element is a
metal screen with sharp edges that
could cause injury if not handled
carefully.
The Þlter element is made of a rugged metal screen al-
lowing the use of any type cleaning solution to clean it.
A small metal brush can be used to remove dirt and de-
bris. After cleaning the Þlter, rinse thoroughly with wa-
ter. Make sure the Þlter assembly is completely dry
before re-installing it.
1.5 Firmware updates
It is possible that you may receive a Þrmware update
from Keithley to enhance operation and/or Þx ÒbugsÓ.
The Þrmware program for the main microprocessor is
contained in U611 (EPROM). A socket is used on the pc
board for this device to make replacement relatively
easy.
The replacement procedure requires that the case cover
be removed. Also, this surface mount, static-sensitive
device requires special handling. As a result, the Þrm-
ware update should only be performed by qualiÞed
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