Switching Regulator Replacement; Fuse/Ic Link Replacement - Sony MKS-8080 Maintenance Manual

1-3. Switching Regulator Replacement

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Unplug the power supply cord before replacing the
switching regulator.
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Do not disassemble the switching regulator.
1. Remove the top plate. (Refer to Section 1-1-1.)
2. Raise the wiring clip.
3. Remove the flexible card wire from the connector
(CN1). (Refer to Section 1-1-2.)
4. Remove the two screws (B3 x 8).
5. Remove the screw (BVTP3 x 10).
6. Remove the four screws fixing the connectors.
7. Remove the three screws (PSW3 x 6), then remove
the CPU-323/CPU-449M board.
8. Remove the five solders fixing the switching regulator.
9. Remove the switching regulator from the CPU-323/
CPU-449M board.
Switching regulator
Wiring clip
CPU-323/
CPU-449M board
PSW 3x6
B 3x8
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On installing the switching regulator, install it in the
reverse order of the removal steps 1 to 9.
MKS-8080/8082

1-4. Fuse/IC Link Replacement

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A fuse and an IC link is critical parts to safe operation.
Replace this component with Sony parts whose part
numbers appear in this manual published by Sony.
If not, this may cause a fire or electric shock. Be sure to
use specified component in this manual.
The MKS-8080/8082 has a fuse and an IC link for circuit
protection.
A fuse and an IC link will blow when abnormality occurs
and an overcurrent flows in this equipment.
Be sure to replace an old fuse and an IC link with the
specified fuse or IC link as shown below after removing
the foreign substances that may cause the shorts.
Board
CPU-323/
CPU-449M PS1 (C-2) IC link, Chip 2A
NOTE: The character in parentheses ( ) indicate the address on board.
PSW 3x6
Washer
Connector
screws
BVTP 3x10
Ref. No. Part name
H.B.C fuse 2A, 250V !1-576-228-51
F1 (A-2)
Part No.
!1-533-282-21
1-3 (E)