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Hitachi FDS 12DV Manual page 2

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(3) After housing (B) has been removed, the parts inside may either be removed together in an assembled state,
or removed individually. First, remove the Shift Arm [15] and Shift Knob [16], being very careful not to allow
the Shift Spring [17] to fly out unexpectedly.
(4) Removal of the Motor [21]
(a) Take off the Cap [9], Spring Holder [10], Spring [11], Thrust Plate [12], and Steel Balls [13], in that order.
At this time, be particularly careful not to lose the four Steel Balls [13].
(b) Remove the four D3 x 8 Tapping Screws [18], and remove the Motor [21].
(5) Disassembly of electric components
[NOTE] The three lead wires from the FET (Field Effect Transistor) and the two lead wires from the diode are
permanently connected to the DC-speed control switch [21] and should not be detached.
Remove the two M3 x 10 FT Screws [25]. The FET of the DC-speed control switch [22] and the Fin Ass'y
[26] can then be disassembled. Then, use a soldering iron to disconnect the lead wires of the DC-speed
control switch [22] from the Motor [21] and the lead wires of the DC-speed control switch [22] from the
Terminal [27].
1-1-2. Reassembly
Perform reassembly in the reverse order of disassembly while observing the given precautions and taking care
of the following points.
(1) Reassembly of electric components
(a) Ensure that the wiring is connected as shown in the diagram in Fig. 8.
The red mark indicates the
positive (
Negative terminal
Lead wire (yellow)
M3 x 10 FT Screw [25]
) terminal side.
FET
Fin
Lead wire (white)
Motor [21]
Positive terminal
Lead wire (white)
Diode
M3 x 10 FT Screw [25]
Lead wire (yellow)
Terminal [27]
Fig. 8
−2−
DC-speed control switch [22]

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