Sony EA-80, Руководство по обслуживанию

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2-5 EA-80
2-5. NOTES ON REPAIR PARTS
2-5-1. Notes on Repair Parts
(1) Safety Related Components Warning
Components marked
!
are critical to safe operation.
Therefore, specified parts should be used in the case of
replacement.
(2) Standardization of Parts
Repair parts supplied from Sony Parts Center may not
be always identical with the parts which actually in use
due to “accommodating the improved parts and/or
engineering changes” or “standardization of genuine
parts”.
This manual's exploded views and electrical spare parts
list are indicating the part numbers of “the standardized
genuine parts at present”.
(3) Stock of Parts
Parts marked with “o” SP (Supply Code) column of the
spare parts list are not normally required for routine
service work. Orders for parts marked with “o” will be
processed, but allow for additional delivery time.
(4) Units for Capacitors, Inductors and Resistors
The following units are assumed in schematic diagrams,
electrical parts list and exploded views unless otherwise
specified.
Capacitors :
µ
F
Inductors :
µ
H
Resistors : Z
2-5-2. Replacement of Chip Parts
Required Tools
Soldering iron : 20 W
If possible, use a soldering-iron tip
heatcontroller set to 270
±
10 ˚C.
Braided wire : Solder Taul or equivalent
Sony part No. 7-641-300-81
Solder : 0.6 mm dia. is recommended.
Tweezers
Soldering Conditions
Soldering iron temperature : 270
±
10 ˚C
Soldering time : Less than 2 seconds
per pin
Replacement of Resistor and Capacitor
1. Place the soldering-iron tip onto the chip part and heat it
up until the solder is melted. When the solder is melted,
slide the chip part aside.
2. Make sure that there is no pattern peeling, damage and/
or bridge around the desoldering position.
3. After removing the chip part, presolder the area, in which
the new chip part is to be placed, with a thin layer of solder.
4. Place new chip part in the desired position and solder
both ends.
NOTE Do not use a chip part again once it has been removed.
Replacement of Transistors and Diodes
1. Cut the terminals of the chip part with nippers.
2. Remove the cut leads with soldering iron as above.
3. Make sure that there is no pattern peeling, damage and/
or bridge around the desoldering positions.
4. After removing the chip part, presolder the area, in which
the new chip part is to be placed, with a thin layer of solder.
5. Place new chip part in the desired position and solder the
terminals.
Replacement of ICs
1. Using the braided wire, “SOLDER TAUL” (Sony Part No.
7-641-300-81), remove the solder around the pins of the
IC-chip to be removed.
2. While heating up the pins, remove the pins one by one
using sharp-pointed tweezers.
3. Make sure that there is no pattern peeling, damage and/
or bridge around the desoldering position.
4. After removing the chip part, presolder the area, in which
the new chip part is to be placed, with a thin layer of
solder.
5. Place new chip part in the desired position and solder the
pins.
Terminals Terminals Terminals
Terminal
Capacitor Resistor Transistor, Diode
Nipper
Transistor