Alinco DJ-S17 - Manual (Page 60)

10.Maintenance and Reference
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4. Attach the connective stay and the insulation
sheets to cover the terminals to avoid short-
circuiting.
5. Connect the other ends of the DC cable to the
output terminals of the power supply.
Be mindful to the polarities of the terminals.
Caution
This insulation sheet marked * is provided to all EDC-143/144 series chargers.
Please be sure to cover the bottom of the charger with this sheet as shown
above to prevent short-circuiting before using them for the first time.