3M SST, Manual

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SST Transport and Burster Mechanism Manual 75-0302-1450-8, Version 1 Ch. 6 Performing Field Repairs • 55
❑
Slide the Upper Belt Tensioner forward or backward to achieve proper tension.
Moving the Tensioner forward loosens the belt. Moving it backward tightens the
belt.
❑
Retighten the screw while holding the Upper Belt Tensioner in the correct
position.
4. Adjust the lower belt tension by completing the following steps;
❑
Loosen the Lower Belt Tensioner, shown in Figure 6.4, using a Phillips
screwdriver. The bearing will drop and the lower belt will visibly loosen. Move
the bearing in one of the following directions:
• Up tightens the belt.
• Down loosens the belt.
❑
When you can push the lower belt up or down 1/16 inch, (1.6 mm), and the upper
belt is not too tight or loose, hold the roller and tighten the bolt. Hold the Lower
Belt Tensioner in place. This keeps the white nylon Belt Tensioner from moving.
5. If you have no additional repairs to perform, reinstall the SST/HP-4 Transport in the
device cabinet.
6. Restore power to the device.
Replacing the PCB-4 PC Board
The 50-pin connector on the PCB-4 Board routes signals from the CPU Board to the SST/HP-4
Transport. The PCB-4 Board also houses the four photo sensors for the hole punch.
1. If you are working with the SST/HP-1 Transport, remove the stepper motor.
2. Open the cabinet of the device in which the SST/HP-4 Transport resides.
3. Back out any tickets, if applicable, from the SST/HP-4 Transport by using the green but-
ton on the CPU Board.
4. Disconnect the power to the SST/HP-4 Transport.
Warning! Disconnect power before removing the SST/HP-4 Transport. If you do not dis-
connect power, you may damage the unit or severe personal injury may occur.
5. Remove the SST/HP-4 Transport. Close the cabinet.
Note: Do not carry the SST/HP-4 Transport by the Print Head. Carrying it by the Print Head may
bend the bracket and cause printing problems. Always carry the SST/HP-4 Transport from
the bottom.
6. Unplug the following connections. Figure 6.5 illustrates the connections.