Sony BKDM-3020, Maintenance Manual

Page: 63 / 78

3-5 (E)
3-5. Replacement of Printed Circuit Boards
3-5-2. KEY-32A Board
1. Remove the three knobs.
2. Remove the bottom plate.(Refer to the section 3-2.)
3. Remove the three screws securing the floppy disk
drive and FD bracket.
(Refer to the step 2 in section 3-4-1.)
4. Disconnect the five connectors (CN6 through CN10)
on the KEY-32A board.
5. Remove the eleven screws on the KEY-32A board.
6. Remove the KEY-32A board together with the rotary
encoder and the KEY bracket (1).
7. Install a new KEY-32A board in the reverse order of
the steps 1 through 6.
3-5-3. KEY-32B Board
1. Remove the bottom plate. (Refer to the section 3-2.)
2. Disconnect the connector CN1 on the KEY-32B board.
3. Remove the five screws on the KEY-32B board.
4. Remove the KEY-32B board with the KEY bracket
(3).
5. Install a new KEY-32B board in the reverse order of
the steps 1 through 4.
Knobs
Rotary
encoders
KEY bracket(1)
BVWH3
X
8
BVWH3
X
8
CN10
CN9
CN6~CN8
KEY-32A board
KEY bracket(3)
KEY-32B board
BVWH3
X
8
CN1
BVWH3
X
8