Service manual

The Internal Cables
5-21
5The Internal Cables
Cabling between the power supply board, the control board, the capacitor board, and the
printhead has changed since the PageWriter 100, 200, 200i, and 300pi cardiographs were
introduced. The cabling for your cardiograph may be different from the replacement parts
you are installing. Refer to the exploded drawings and replacement parts lists in Chapter 6
for an explanation of the changes.
Replacing the Power Supply Cables
Your power supply cables may have different part numbers. See Bottom Case Assembly
Parts in Chapter 6 for replacement history.
Two cables connect the power supply board and the control board. To replace these
cables:
1. Perform the procedures “Removing the Battery” and “Removing the Keyboard
Assembly”.
2. Perform the procedure “Opening and Removing the Top Cover Assembly”.
3. Using a 7 mm or 9/32 inch wrench, loosen the nut on the ground lug.
4. Separate the power supply board from the lower case.
5. Lift the black ferrite bead on the battery cable out of its pocket in the lower case.
6. Disconnect the cable from the power supply by grasping all the wires of the cable and
evenly pulling away from the power supply board.
7. Disconnect the other end of the cable from the control board.If the cable you are
replacing is part number M1770-61604, there is also a connection to the capacitor
board. In this case, you must also replace the old capacitor board with the new capac-
itor board (p/n M1770-60172), and add the new cable (p/n M1770-61666) between
the capacitor board and the control board
8. Connect the replacement cable to the control board using the end of the cable closest
to the ferrite bead. Substantial force is needed to fully seat the connectors.
9. Connect the other end of the cable to the power supply board.
10. Pull the power supply cables snugly, but not too tightly, around the back and under
the power supply board so that the cables are aligned with the slot in the bottom edge
of the board.
NOTE