Panasonic EY74A1 Service Manual page 6

3.2. Trial Operation (after checking Troubleshooting Guide)
3.2.1. Assembly
• Confirm if there is no gap between housing A and B by pinching lead wires.
• There is no dust or deformation on battery terminals.
• Confirm if there is no dirt when repairing.
3.2.2. Operation
• Confirm the forward and reverse side of rotation.
• Confirm if LED lights ON. Once battery pack is removed, press the switch handle; otherwise LED does not light ON.
• Check if the motor rotation become higher as the amount of depression of switch handle.
• Check if the rotation speed is normal rated value.
High : 1,750/min (rpm) at 18V, 1,400/ min (rpm) at 14.4V
Low : 600/min (rpm) at 18V, 450/ min (rpm) at 14.4V
• Confirm the action when setting the drill mode
• Confirm if the rotation stops immediately when releasing the switch handle.
• Confirm if the chuck jaws move smoothly and hold the bit firmly.
• Check if the clutch torque changes suited for the number of clutch.
• Confirm if the chuck is assembled firmly and chuck jaws operate normally.
• Confirm if there is no abnormal sound when shaking the unit with the switch on.
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