Keithley 2182, Service Manual, Page: 49 / 120

4-2 Troubleshooting
Introduction
This section of the manual will assist you in troubleshooting and repairing the Model 2182.
Included are self-tests, test procedures, troubleshooting tables, and circuit descriptions. Note
that disassembly instructions are located in
Section 5 , while component layout drawings may be
found at the end of Section 6 .
WARNING The information in this section is intended only for qualified service
personnel. Do not perform these procedures unless you are qualified to do
so. Some of these procedures may expose you to hazardous voltages that
could cause personal injury or death. Use caution when working with
hazardous voltages.
Repair considerations
Before making any repairs to the Model 2182, be sure to read the following considerations.
CAUTION The PC-boards are built using surface mount techniques and require
specialized equipment and skills for repair. If you are not equipped and/or
qualified, it is strongly recommended that you send the unit back to the
factory for repairs or limit repairs to the PC-board replacement level.
Without proper equipment and training, you could damage a PC-board
beyond repair.
• Repairs will require various degrees of disassembly. However, it is recommended that
the Front Panel Tests be performed prior to any disassembly. The disassembly
instructions for the Model 2182 are contained in
Section 5 of this manual.
• Do not make repairs to surface mount PC-boards unless equipped and qualified to do so
(see previous CAUTION).
• When working inside the unit and replacing parts, be sure to adhere to the handling
precautions and cleaning procedures explained in
Section 5 .
• Many CMOS devices are installed in the Model 2182. These static-sensitive devices
require special handling as explained in
Section 5 .
• Whenever a circuit board is removed or a component is replaced, the Model 2182 must
be recalibrated. See
Section 2 for details on calibrating the unit.