Disassembly Procedure - Yamaha Portatone PSR-550 Service Manual

DISASSEMBLY PROCEDURE

1. Lower Case Assembly
(Time required : About 5 min.)
[440A]
[430A]
2. Spring Terminal
(Time required : About 10 min.)
2-1. Remove the lower case assembly. (See procedure 1)
2-2. Remove the BAT connector assembly (red/black)
soldered to the spring terminal (+)/(-). (Fig. 2)
2-3. Remove the battery cover assembly. (Fig. 1)
2-4. Remove the spring terminal by releasing hooks
(2 locations for each). (Fig. 3)
BAT Connector
Assembly (Black)
(Fig.2)
Hook
(Fig.3)
Battery Cover Assembly
[430A]
[430A] : Bind Head Tapping Screw-P
[440A] : Bind Head Tapping Screw-P
Lower Case BAT Connector
Assembly Assembly (Red)
Hook
Spring Terminal
1-1. Remove the fourteen (14) screws marked [430A]
and the four (4) screws marked [440A]. The lower
case assembly can then be removed. (Fig. 1)
[430A]
Lower Case Assembly
[430A]
3.0X12 MFZN2Y (EP600300)
3.0X25 MFZN2Y (VK228100)
(Fig.1)
3. DM Circuit Board, Shield Box U and L
(Time required : About 10 min.)
3-1. Remove the lower case assembly. (See procedure 1)
3-2. Remove the two (2) screws marked [430B] and the
fourteen (14) screws marked [450]. The shield box
U and the DM circuit board can then be removed.
(Fig. 4)
3-3. Remove the three (3) screws marked [420A]. The
shield box L can then be removed. (Fig. 4)
4. Floppy Disk Drive Assembly
(Time required : About 10 min.)
4-1. Remove the lower case assembly. (See procedure 1)
4-2. Remove the DM circuit board and the shield box
U and L. (See procedure 3)
4-3. Remove the four (4) screws marked [460]. The
floppy disk assembly can then be removed. (Fig. 5)
5. AM Circuit Board
(Time required : About 15 min.)
5-1. Remove the lower case assembly. (See procedure 1)
5-2. Remove the DM circuit board and the shield box
U and L. (See procedure 3)
5-3. Remove the eleven (11) screws marked [420B].
The AM circuit board can then be removed. (Fig. 5)
[440A] [430A]
[430A]
PSR-550
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