Repair considerations
Before making any repairs to the Model 2000, be sure to read the following considerations.
CAUTION The PC-boards are built using surface mount techniques and require special-
ized 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 re-
pairs or limit repairs to the PC-board replacement level. Without proper
equipment and training, you could damage a PC-board beyond repair.
1. Repairs will require various degrees of disassembly. However, it is recommended that
the Front Panel Tests and Built-In-Test be performed prior to any disassembly. The dis-
assembly instructions for the Model 2000 are contained in Section 3 of this manual.
2. Do not make repairs to surface mount PC-boards unless equipped and qualified to do so
(see previous CAUTION).
3. When working inside the unit and replacing parts, be sure to adhere to the handling pre-
cautions and cleaning procedures explained in Section 3.
4. Many CMOS devices are installed in the Model 2000. These static-sensitive devices re-
quire special handling as explained in Section 3.
5. Anytime a circuit board is removed or a component is replaced, the Model 2000
must be recalibrated.
Power-on test
During the power-on sequence, the Model 2000 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.
Troubleshooting 2-3
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