Service manual

37Printer Applicator System PAM 3600
Service Manual PAM 3600 4 Replacing Assembly Units
4.9 Replacing the CPU PCB
WARNING!
Mortal danger by electric shock!
Disconnect power supply!
Switch off compressed air!
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3 42 5
Figure 4m Replacing the CPU PCB
1 Fixing screw
2 Stepper motor driver
3 CPU PCB
4 Heat conductor pad
5 Cooling rib
If possible backup the settings of the printer conguration on a CompactFlash card as described in the chapter
"Save NVRAM".
Pull out all interface connectors at the side of the printer.
Remove a possibly installed interface card (Ethernet, USB Slave, Twinax-/Coax Converter, RS-422/485).
Remove the cover.
Remove the cable across the CPU PCB (3).
Pull out all plugs of the CPU PCB (3).
Remove the 4 screws (1) xing the PCB.
Remove the CPU PCB (3).
To provide reliable functioning of the printer, a good thermal contact between the stepper motor driver (2) on the
CPU PCB (3) and the cooling rib (5) of the chassis is necessary. Therefore a pad of heat conductor foil (4) is located
between the cooling rib and the stepper motor driver.
When replacing the CPU PCB, the pad may remain on the defective board. To replace a pad, one spare pad (Part
No. 5943182) is delivered with the replacement board.
9. Check if the heat conductor pad (4) is sticking on the cooling rib (5) after removing the defective board.
10. Before attaching the new heat conductor pad, remove any pieces of old foil from the cooling rib. Peel the cover
foil from the white pad surface rst and stick it to the cooling rib as shown in the gure.
11. Now peel the cover foil from the pink surface of the heat conductor pad.
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