Precautions On Disassembly And Reassembly; Disassembly; Reassembly - Hitachi UC 18YML2 Technical Data And Service Manual

9. PRECAUTIONS ON DISASSEMBLY AND REASSEMBLY

[Bold] numbers in the descriptions below correspond to item numbers in the Parts List and
exploded assembly diagram for the Model UC 18YML2.

9-1. Disassembly

(1) Remove Case (A) [2] after removing the four Case Rubber [13] and the four Tapping Screw
(W/Flange) D3 x 18 [12].
(2) Remove the Fan [21] after removing the two Tapping Screw (W/Flange) D3 x 25 [20], and
then remove the connector of the Fan [21] from the Printed Circuit Board Ass'y [19].
(3) Remove Fin (A) [8] and Fin (B) [10] from the Printed Circuit Board Ass'y [19] after removing
the three Machine Screw (W/Washers) M3 x 12 [9], three Nut M3 [6] and four TP Tapping
Screw D3 x 8 [4].
(4) Remove Insulator (A) [7] and Insulator (A) [7] from the Printed Circuit Board Ass'y [19].
(5) Remove the Terminal Holder [16] after removing the three TP Tapping Screw D3 x 8 [4] and
the connector of the Terminal Holder [16] from the Printed Circuit Board Ass'y [19], and then
use a soldering iron to melt the soldered connections of the red and black lead wires of the
Terminal Holder [16], and finally remove the wires.
(6) Remove the Cord [18] from the Printed Circuit Board Ass'y [19] after melting the soldered
connections with a soldering iron.
(7) The Prism [15] for pilot lamps is built into Case (A) [2] and the filter is stuck on Case (A) [2].
NOTE:
Ideally, the soldered portions should be freed with a solder absorber. If it is
•
necessary to use a soldering iron, use one with rated power of 35 W.
As excessive heat may damage the material of the printed circuit board, use of the
•
soldering iron should be limited to less than three seconds at one time.

9-2. Reassembly

Conduct reassembly by reversing the disassembly procedures; however, special attention should
be given to ensure that lamps, cord armor and charging terminals are properly installed in the
prescribed grooves.
(1) Screw tightening torque
Machine Screw (W/Washers) M3 x 12 [9] ---------------- 0.4 to 0.7 N
•
TP Tapping Screw D3 x 8 [4] -------------------------------- 0.6 to 1.0 N
•
Tapping Screw (W/Flange) D3 x 18 [12]------------------ 0.6 to 1.0 N
•
Tapping Screw (W/Flange) D3 x 25 [20]------------------ 0.6 to 1.0 N
•
-11-
m (4.0 to 7.0 kgf cm)
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m (6.0 to 10.0 kgf cm)
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m (6.0 to 10.0 kgf cm)
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m (6.0 to 10.0 kgf cm)
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