Main Circuit Board; Replacing The Lithium Battery; Jk2 Circuit Board; Jk1 Circuit Board - Yamaha DM1000 Service Manual

9.

MAIN Circuit Board

(Time required: About 12 minutes)
9-1. Remove the SP1000. (See procedure 1.)
9-2. Remove the MB1000. (See procedure 2.)
9-3. Fasten the control panel assembly. (See procedure 3.)
9-4. Remove the rear assembly U. (See procedure 4-5.)
9-5. Remove the OPT circuit board. (See procedure 8.)
9-6. Remove the ten (10) screws marked [12C]. The
MAIN circuit board can then be removed. (Fig.4)
10.

Replacing the Lithium Battery

(Time required: About 7 minutes)
10-1. Remove the SP1000. (See procedure 1.)
10-2. Remove the MB1000. (See procedure 2.)
10-3. Fasten the control panel assembly. (See procedure 3.)
10-4. You can replace the lithium battery from the MAIN
circuit board. (Fig.4)
The lithium battery is not part of the MAIN
circuit board. When you replace the MAIN
circuit board, you should remove the lithium
battery from the board, and install in the holder
on the new circuit board.
Important data should be backed up by MIDI
dump. (See page 146.)
11.

JK2 Circuit Board

(Time required: About 12 minutes)
11-1. Remove the SP1000. (See procedure 1.)
11-2. Remove the MB1000. (See procedure 2.)
11-3. Fasten the control panel assembly. (See procedure 3.)
11-4. Fasten the rear assembly U. (See procedure 4-4.)
11-5. Remove the OPT circuit board. (See procedure 8.)
11-6. Remove the two (2) hexagonal locking screws
marked [D]. The JK2 circuit board can then be
removed. (Fig.4)
12.

JK1 Circuit Board

(Time required: About 14 minutes)
12-1. Remove the SP1000. (See procedure 1.)
12-2. Remove the MB1000. (See procedure 2.)
12-3. Fasten the control panel assembly. (See procedure 3.)
12-4. Fasten the rear assembly U. (See procedure 4-4.)
12-5. Remove the OPT circuit board. (See procedure 8.)
12-6. Remove the JK2 circuit board. (See procedure 11.)
12-7. Remove the three (3) screws marked [350A]. The
heat sink and the DCAIC angle can then be removed.
(Fig.3)
12-8. Remove the three (3) screws marked [130A], the
five (5) screws marked [140], the four (4) screws
marked [145], the three (3) screws marked [150],
the two (2) hexagonal locking screws marked [160]
and the two (2) hexagonal locking screws marked
[E]. The JK1 circuit board can then be removed.
(Fig.4)
DM1000/MB1000/SP1000
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