Chip parts replacement – MITSUBISHI ELECTRIC WS-48315 User Manual

Page 42

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Page 42

MODELS: WS-48315 / WS-55315 / WS-65315

CHIP PARTS REPLACEMENT

Some resistors, shorting jumpers (0 Ohm resistors),

ceramic capacitors, transistors and diodes are chip parts.
The following precautions should be taken when replacing
these parts.

Cautions:

1. Use a fine tipped, well insulated soldering iron

(approximately 30 watts), and tweezers.

2. Melt the solder and remove the chip parts

carefully so as not to tear the copper foil from
the printed circuit board.

3. Discard removed chips; do not reuse them.
4. Do not apply heat for more than 3 (three)

seconds to new chip parts.

5. Avoid using a rubbing stroke when soldering.
6. Take care not to scratch, or damage the chip

parts when soldering.

7. Supplementary cementing is not required.

Chip Parts Removal (Resistors, Capacitors, etc.)

1. Grasp the part with tweezers. Melt the solder

at both sides alternately, and remove one side
of the part with a twisting motion.

2. Melt the solder at the other side and remove

the part.

Chip Parts Removal (Transistors)

1. Melt the solder of one lead and lift the side of

that lead upward.

2. Simultaneously melt the solder of the other

two leads and lift the part from the PCB.

Replacement

1. Presolder the contact points on the circuit

pattern.

2. Press the part downward with tweezers and

apply the soldering iron as shown.

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