Motorola HT1250-LS+

Maintenance 3-3
● Be careful not to form solder bridges between the connector pins.
● Examine your work closely for shorts due to solder bridges.
Flexible Circuits
The flexible circuits are made from a different material than the rigid boards, and require different
soldering techniques. Excessive prolonged heat on a flexible circuit can damage the material.
Therefore, avoid excessive heat and excessive bending.
For parts replacement, use the ST-1087 Temperature-Controlled Solder Station with a 600-700
degree tip, and use small diameter solder such as ST-633. The smaller size solder will melt faster and
require less heat to be applied to the circuit.
To replace a component on a flexible circuit:
1. Grasp with seizers (hemostats) the edge of the flexible circuit near the part to be removed.
2. Pull gently.
3. Apply the tip of the soldering iron to the component connections while pulling with the seizers.
3.5 Disassembling and Reassembling the Radio — General
Since these radios may be disassembled and reassembled with the use of only four (board to casting)
screws, it is important to pay particular attention to the snaps and tabs, and how parts align with each
other.
The following tools are required for disassembling the radio:
● 3/16” flat blade screwdriver
● Penknife-size screwdriver
● TORX® T6 screwdriver
If a unit requires more complete testing or service than is customarily performed at the basic level,
send this unit to a Motorola Authorized Service Center. (See Chapter 1, section 1.2.4 Technical
Support on page 1-3 for a list of authorized service centers.)
The following disassembly procedures should be performed only if necessary:
section 3.6.2 Chassis Assembly Disassembly on page 3-6
section 3.6.3 Keypad, Display, and Keypad/PassPort Option Board Disassembly on page 3-6
section 3.6.4 Speaker, Microphone, and Universal Connector Flex Disassembly on page 3-8
section 3.6.5 PTT Disassembly on page 3-9
section 3.6.6 Control Top Disassembly on page 3-9
section 3.7.7 Option Board Installation on page 3-12
NOTE
Do not attempt to puddle-out components. Prolonged application of heat may
damage the flexible circuit.