Replacement
Follow the removal steps in reverse order.
Logic Board - Model 003
Logic Board Component Inspection
During the logic board removal procedure it is necessary to visually inspect the logic board modules and
components for burns, cracks, discolorations, or other indications of damage. If damage is found, use
Figure 124 and the Logic Board Component Inspection Reference to identify the damaged driver circuit.
Replace the cable and component related to the damaged circuit in addition to the logic board. For example, if
you discovered a burned area around the U38 module, you would replace the AFTA motor and the AFTA
cable, as well as the logic board.
Attention: The electronic parts of this printer can be damaged by electrostatic discharge (ESD). Use ESD
protection devices and procedures, including a static discharge wrist strap, while working on the printer.
DANGER
To prevent serious personal injury from electrical shock when connecting or disconnecting the interface
cable, set the printer power switch to O (Off) and unplug the power cord.
Chapter 5. Removals and Adjustments
366
Summary of Contents for 4247
Page 1: ...4247 Printers Maintenance Information Document Number SA24 4400 05 Part Number 27P8450 IBM ...
Page 241: ...e90apc15 Figure 24 Main Input Power Supply Ground Chapter 3 Circuit Diagrams 241 ...
Page 257: ...Figure 32 Stacker Motor Wiring Chapter 3 Circuit Diagrams 257 ...
Page 261: ...Stacker Cable Wiring Figure 36 Tractor Assembly Cable Wiring Chapter 3 Circuit Diagrams 261 ...