Keithley 2010 Service Manual

Introduction
This section of the manual will assist you in troubleshooting and repairing the Model 2010.
Included are self-tests, test procedures, troubleshooting tables, and circuit descriptions. It is left
to the discretion of the repair technician to select the appropriate tests and documentation needed
to troubleshoot the instrument.
WARNING The information in this section is intended for qualified service personnel
only. 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 2010, 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 2010 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 2010. 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 2010 must
be recalibrated. See Section 2 for details on calibrating the unit.
Power-on self-test
During the power-on sequence, the Model 2010 will perform a checksum test on its EPROM
(U156 and U157) and test its RAM (U151 and U152). If one of these tests fails, the instrument
will lock up.
4-2 Troubleshooting

Keithley 2010 Specifications

General

Frequency Range	3 Hz to 300 kHz
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
DC Current Range	3 A
DC Current Accuracy	0.05%
AC Current Range	3 A
Resistance Accuracy	0.01%
Interface	GPIB, RS-232
Power Supply	50 Hz or 60 Hz