Troubleshooting; Introduction - Picotest M3500A Service Manual

3

Troubleshooting

3.1 Introduction

The information provide in this section will assist you in troubleshooting the
M3500A. This section is arranged as follows:
Introduction – Introduce what is provided in this section includes some

considerations that should be noted before making any repairs to the
M3500A.
System function block – Provides brief descriptions about the principles

of operation in M3500A.
Front panel module – Provides the procedure to test the functionality of

the front panel module.
Main board module – Provides the test procedures and brief operation

theories of the main board module, includes power supply circuitry,
analog front-end circuitry, DSP & MCU, and main control circuitry.
Self-Test – Explain to the self-test procedures built in M3500A.

Warning! Some procedures in this section may expose you to
hazardous voltage or damage your instrument. Do not perform these
procedures unless you are qualified to do so.
Be sure to read the following considerations before making any repairs to
the M3500A.
Repairs will require various degrees of disassembly. Please refer to the

section 4 of this manual for detail disassembly instructions of M3500A.
It is recommended performing self-test procedure prior to any
disassembly.
Do not make repairs to the PC-board unless you are equipped and/or

qualified to do so. Without proper equipment and training, you could
damage a surface mount PC-board before repair. It is recommended
26