Phaser 6121MFP Service Manual 8-5
Service Parts Disassembly
Fastener Types
The following table lists the primary types of Posi-Drive screws used to assemble 
the printer. The procedures provide dimensional specifications for screws being 
removed.
Use care when installing self-tapping screws in plastic. To properly start the 
screw in plastic, turn the screw counter-clockwise in the hole until you feel the 
screw engage the threads, then tighten as usual. Improperly aligning or over 
tightening the screw can result in damage to previously tapped threads.
Always use the correct type and size screw. Using the wrong screw can 
damage tapped holes. Do not use excessive force to remove or install either a 
screw or a printer part.
Posi-Drive Screw Types Used in this Product
Type Application Shape Characteristics
Self-tapping, 
plastic
1. Silver colored.
2. Screw thread is coarse 
compared to metal 
screw.
3. Screw tip is thin.
Sheet Metal, 
silver
1. Silver colored.
2. Diameter is uniform.
Sheet Metal, 
with flange
1. Silver colored.
2. Screw has a flange.
3. Diameter is uniform.
Sheet Metal, 
silver with lock 
washer
1. Silver colored.
2. Includes a toothed 
washer.
3. Diameter is uniform.
4. Used for grounding 
terminals.