Precautions On Disassembly And Reassembly; Confirmation After Reassembly - Hitachi UC 10SL2 Service Manual

2. Precautions on disassembly and reassembly

[Bold] numbers in the description below correspond to the item numbers in the Parts List and exploded
assembly diagram for the Model UC 10SL2.
WARNING: Prior to disassembly, be sure to disconnect the power plug from the power supply.
(1) Remove the four Tapping Screws (W/Flange) D3 x 18 [2] and remove Case (A).(B) Set [1]. The Printed
Circuit Board Ass'y [7] and the Cord [4] can then be taken out as an assembled body.
(2) To separate the Printed Circuit Board Ass'y [7] from the Cord [4], melt the soldered portions with a
soldering iron.
NOTE: Ideally, the soldered portions should be freed with a solder absorber. If a soldering iron
must be used, use one with a rated power of 35 W.
Reassembly can be accomplished by reversing the disassembly procedure; however, special attention
should be given to ensure that lamps, cord armor and charging terminals are properly installed in their
prescribed grooves.
Tapping Screw (W/Flange) D3 x 18 [2] ········································· 0.6 to 1.0 N•m (6.0 to 10.0 kgf•cm)
(1) After reassembly, check that the red pilot lamp on the charger goes on when charging starts.
When charging the Type BCL 1015 battery, check that the red pilot lamp remains on for about 30
minutes after the start of charging.
(2) Measure the insulation resistance and conduct a dielectric strength test.
• Insulation resistance
10 M or higher between the plug blade of the cord and the name plate or the fastening screws on the
case, with a 500 VDC megohm tester
• Dielectric strength test
(a) Between the plug blade of the cord and the charging terminal blade
(b) Between the plug blade of the cord and the name plate or the fastening screws on the case
Conduct a dielectric strength test based on the voltage listed on the name plate.
Voltage listed on the name plate
120 V
220 V to 240 V
CAUTION: Without fail, insulation resistance must be measured between the plug blade of the
cord and the name plate or the fastening screws, and a dielectric strength test must
be conducted between the plug blade of the cord and the charging terminal blade or
between the plug blade of the cord and the name plate or the fastening screws on the
case. Under no circumstances should testing be conducted between both blades of
the plug or those of the charging terminal. Doing so may cause the charger to burn
out.
Disassembly
Reassembly
Screw tightening torque

Confirmation after reassembly

Test voltage
1,240 VAC (1 minute)
3,750 VAC (1 minute)
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