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110 General Information TM9100 Service Manual

Spare Cans

It is good practice to discard any can that has been removed and replace

it with a spare can. If this is not done, special precautions are needed

when re-installing the original can. These precautions are discussed as

part of the training for accreditation.

4.7 SMT Repair Techniques

Standard Procedures Service centers carrying out level-2 repairs are expected to be familiar

with the standard techniques for the replacement of SMT components.

However, certain components on the main board require non-standard

techniques and these are discussed below. Another issue of concern is the

procedure for removing and installing cans. A discussion of the issue

concludes this section.

Non-standard

Procedures

Do not use the standard SMT repair techniques when replacing the

capacitors C548 and C565 and the inductors L601 and L602.

The standard techniques tend to produce excessive heat, which will

damage these components. Do not use a hot-air tool or heat gun. Instead

use solder paste and a standard soldering iron with an iron tip with a

specified temperature of 600°F (315°C). The capacitors are part of the

frequency-synthesizer circuitry under the

SYN TOP can. The inductors are

part of the SMPS of the power-supply circuitry on the bottom-side of

the board. Figure 4.5 on page 111 shows the locations of the

components.

Tait TM9100 Service Manual

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