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PAGE 42
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
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.
Summary of Contents for VS-A50
Page 2: ......
Page 58: ...Page 58 MODELS VS A50 WS A48 WS A55 WS A65 POWER SUPPLY ...
Page 59: ...Page 59 MODELS VS A50 WS A48 WS A55 WS A65 VIDEO COLOR PATH ...
Page 60: ...Page 60 MODELS VS A50 WS A48 WS A55 WS A65 SYNC PATH ...
Page 61: ...Page 61 MODELS VS A50 WS A48 WS A55 WS A65 DEFLECTION HV CIRCUIT ...
Page 62: ...Page 62 MODELS VS A50 WS A48 WS A55 WS A65 X RAY PROTECT ...
Page 63: ...Page 63 MODELS VS A50 WS A48 WS A55 WS A65 HV REGULATION ...
Page 64: ...Page 64 MODELS VS A50 WS A48 WS A55 WS A65 SOUND PATH ...
Page 65: ...Page 65 MODELS VS A50 WS A48 WS A55 WS A65 CONVERGENCE CIRCUIT ...
Page 66: ...Page 66 MODELS VS A50 WS A48 WS A55 WS A65 CONTROL CIRCUIT ...