Canon 3245 Troubleshooting Manual page 92

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Finisher-S1/Puncher Unit-R1 (Optional)
2-32
Lift and pull out the staple case from the stapler unit, holding it by the
green tab.
Place the staple case, as shown below, press the area indicated by PUSH,
and then pull out the staple cartridge.
Insert the new staple cartridge.
Press the spring-loaded case down until it clicks into place.