Maintenance
7-4
To replace the battery, Þrst locate its holder (labeled
BT100). Use a small non-metallic tool to lift the battery
so that it can be slid out from under the retainer spring
clip.
The new battery should be reinstalled with the “+” ter-
minal facing up. Lift up on the retaining clip and place
the edge of the battery under the clip. Slide the battery
fully into the holder. Recheck previously stored set-
tings and re-enter the conÞguration as necessary.
7.4.4 Changing firmware
WARNING
Disconnect the instrument from the
power line and all other equipment
before changing the Þrmware.
Changing of the Þrmware is not a routine maintenance
item, but may be necessary as upgrades become avail-
able. The Þrmware revision levels of the main CPU and
display CPU are displayed brießy on the front panel
when the Model 7001 is switched on.
The Þrmware for the main CPU is located in EPROM
U113, a leadless IC which resides in a chip carrier on
the digital board.
Replacement of the main CPU Þrmware requires re-
moval of the instrument case, followed by removal of
the digital board and its shield.
Removal and replacement of the Þrmware EPROM
should be performed only by qualiÞed personnel using
appropriate IC extraction tools.
7.5 Disassembly of the instrument
Normal maintenance of the Model 7001 requires re-
moval of the instrument cover. Further disassembly
should only be required for repair.
WARNING
Disconnect the power cord from the
rear of the instrument and allow sev-
eral minutes for any energy stored in
the power supply or other circuits to
bleed off before opening the instru-
ment. Also, remove the IEEE-488 ca-
ble and any boards plugged into the
Model 7001 backplane.
NOTE
If the Model 7001 has been rack
mounted, the feet, handle, and handle
mounting ears will have been re-
placed by rack mount hardware. If so,
modify the disassembly and assembly
instructions accordingly.
For the following procedures, you will require a #2
Phillips screwdriver with a 4-inch shaft and a ßat-blad-
ed pocket screwdriver.
Generally, assembly is the reverse order of disassem-
bly. Some items, such as the handle, case, rear bezel,
and internal cabling, can be properly reinstalled only
one way. Make note of the orientation of any items
which you remove.
7.5.1 Removal of the case
Refer to drawing 7001-054 Final Chassis Assembly at
the end of this section.
1. Set the Model 7001 on a ßat surface, resting on its
bottom.
2. Grasp the handle at each pivot point where it at-
taches to the sides of the instrument. Simulta-
neously pull both sides of the handle gently
outward, away from the instrument. While main-
taining outward pressure on the sides of handle,
swing the handle fully below the bottom surface of
the case. At the point where the arrows on the han-
dle line up with the arrows on the mounting ears,
the sides of the handle can be separated slightly
more, permitting the handle to be completely re-
moved.
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