Specifications

7193 Service Guide Chapter 5: Disassembling and Reassembling the Printer
August 1998 53
Replacing the Print Mechanism
Replacing the PC Board Assembly on the Print Mechanism
See “Separating the Print Mechanism and PC Board Assembly” for more information.
1. Place the PC board next to the right side of the print mechanism in a vertical position,
so that J2 and J3 connectors are up.
The printhead area of the mechanism should be facing you with the board next to it
and to your right. The ZIF printhead connector (J8) should be to the left side of the
board (closest to you).
2. Align the PC board and the mechanism in the following areas:
• The rear communication connector with the rear cutout area
• The power connector with the channel
3. Reconnect the cables and harnesses.
4. Make sure nothing is pinching and that the printhead cable is not creased.
5. Line up the screw hole in the PC board with the screw slot.
6. Replace the screw and tighten slowly with a screwdriver.
Do not over tighten.
Reconnecting the Cables and Harnesses
Reconnect the Printhead Cables
See “Separating the Print Mechanism and PC Board Assembly” for more information.
The solder side of the PC board should be up when it is reconnected.
1. Insert the 4-pin frame ground (J7) into position in its connector.
2. Lift up the locking outer shell of the larger ZIF connector, insert the cable to the
bottom, and push down on the shell.
Make sure the cables are placed so they are straight.
Reconnect the Knife and Paper Feed Motor Cables
See “Separating the Print Mechanism and PC Board Assembly” for more information.
1. Hook up the knife harness to connector J2 and the paper feed harness to J3.
The number labels on each harness should be facing out to the edge of the board.
2. Push gently until they are in position.
Reconnect the Sensor Harness
The sensor harness is for the knife home, paper out, and cover open switchesSee
“Separating the Print Mechanism and PC Board Assembly” for more information.
1. Plug the sensor harness into connector J1.
2. Make sure that its keyed area fits properly.