G Disassembling/Reassembling; Disassembly/Adjustment Prohibited Items; Paint-Locked Screws; Red-Painted Screws - Konica Minolta BIZHUB C3100P Service Manual

G DISASSEMBLING/REASSEMBLING

1. Disassembly/adjustment prohibited items

1.1 Paint-locked screws

NOTE
• To prevent loose screws, a screw lock in blue or green series color is applied to the screws.
• The screw lock is applied to the screws that may get loose due to the vibrations and loads created by the use of machine or due to
the vibrations created during transportation.
• If the screw lock coated screws are loosened or removed, be sure to apply a screw lock after the screws are tightened.

1.2 Red-painted screws

NOTE
• The screws which are difficult to be adjusted in the field are painted in red in order to prevent them from being removed by
mistake.
• Do not remove or loosen any of the red-painted screws in the field. It should also be noted that, when two or more screws are
used for a single part, only one representative screw may be marked with the red paint.

1.3 Variable resistors on board

NOTE
• Do not turn the variable resistors on boards for which no adjusting instructions are given in Adjustment/Setting.

1.4 Inspection before Servicing

• To avoid electric shock, after turning OFF the power
switch, do not touch the DC power supply unit for 9
minutes.
If the DC power supply unit is faulty, it may take time
before its voltage drops sufficiently.
• When removing a circuit board or other electrical component, refer to
"Handling of PWBs" and follow the corresponding removal
procedures.
• The removal procedures given in the following omit the removal of
connectors and screws securing the circuit board support or circuit
board.
• Where it is absolutely necessary to touch the ICs and other electrical
components on the board, be sure to ground your body.

1.5 Precautions for disassembly

• When accessing a hard-to-view or narrow spot, be careful about sharp edges and burrs of the frame and parts.
They may injure your hands or fingers.
• If it is absolutely necessary to service the machine with the door open or external covers removed, always be attentive to the motion of the
internal parts.
A normally protected part may cause unexpected hazards.
• When removing a part that secures a motor, gear, or other moving part, disassembling a unit, or reinstalling any of such parts and units, be
careful about moving parts and use care not to drop any part or unit. During the service procedure, give sufficient support for any heavy unit.
You may be injured by a falling part or unit.
G DISASSEMBLING/REASSEMBLING > 1. Disassembly/adjustment
WARNING
CAUTION
G-1
prohibited i...