Panasonic EY7420 Service Manual page 6

3.1. Trial Operation (after checking Troubleshooting Guide.)
3.1.1. ASSEMBLY
1. Confirm if there is NO gap between Housing A and B by pinching the lead wires.
2. Confirm all screws are tightened firmly.
3. There should be no metallic sound and abnormal sound.
4. There is no dust or deformation on battery terminals.
5. Confirm if there is no dirt when reparing.
3.1.2. OPERATION
1. Confirm the forward and reverse side of rotation.
2. Confirm the smooth changing of HIGH and LOW handle and its changing mode.
3. Confirm if LED rights ON. Once battery pack is removed and attached, press the switch handle, otherwise LED does not right
ON.
4. Confirm the smooth sliding of bit holder and to hold the bit firmly.
5. Confirm if the rotation;
HIGH: 0-900 +150/-100 rpm
3.1.3. SWITCH
1. Confirm the rotation of speed if it changes in proportion to the amount of pushing level on switch handle.
2. Confirm if the rotation stops when releasing the switch handle.
3. Confirm if the auto-stop operation with clutch "5"
3.1.4. CLUTCH
1. Check if the clutch torque changes suited for the number of clutch.
LOW: 0-300 +50/-30 rpm
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