Disassembly
3-6
U611, a leadless IC which resides in a chip carrier on
the digital board.
Perform the following steps to replace the CPU Þrm-
ware:
WARNING
Disconnect the instrument from the
power line and remove all test leads
before changing the Þrmware.
1. Remove the case cover as explained in paragraph
3.4.1.
2. Turn the instrument upside down to gain access to
the digital board.
3. Locate U611 (EPROM) on the digital board. It is the
only device installed in a chip carrier (socket).
CAUTION
EPROM U611 is a static sensitive de-
vice. Be sure to adhere to the han-
dling precautions explained in
paragraph 3.3.
4. Using an appropriate chip extractor, remove U611
from the chip carrier.
5. Position the new EPROM on the chip carrier. Make
sure the notched corner of the chip is aligned with
the notch in the chip carrier.
6. With the EPROM properly positioned, push down
on the chip until it completely seats into the chip
carrier.
3.9 Instrument re-assembly
The instrument can be re-assembled by reversing the
previous disassembly procedures. Make sure that all
parts are properly seated and secured, and that all con-
nections are properly made. To ensure proper opera-
tion, shields must be replaced and fastened securely.
WARNING
To ensure continued protection
against safety hazards, verify that
power line ground (green wire at-
tached to AC power receptacle) and
the power transformer ground are
connected to the chassis.
3.10 Assembly drawings
The following assembly drawings are provided to as-
sist in disassembly and re-assembly of the instrument.
Also, the Keithley part numbers for most mechanical
parts are provided in these drawings.
Front Panel Assembly; 2001-040
Analog Shield Assembly; 2001-050
Chassis Assembly (Analog Board); 2001-051
Chassis Assembly (Front Panel and Miscellaneous);
2001-052
Chassis Assembly (Digital Board); 2001-053
Chassis Assembly (Case Cover and Handle); 2001-054
Chassis Assembly (Fan, Banana Jacks and Miscella-
neous); 2001-060
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