NCR 7156, Service Manual

Page: 78 / 206

Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide
September 1998 64
Disconnecting Cables from the Common PC Board
The common PC board replaces older RS-232C and LCSIO (RS-485) PC boards. The board
is populated differently for each interface. See “Removing the PC Board” in chapter 9 for
more information.
When the common PC board replaces the LCSIO (RS-485) PC board with the MICR check
reader option, the MICR amplifier board must also be removed. See “Removing the MICR
Amplifier Board: LCSIO (RS-485) Models” in chapter 9 for more information. Three
extender cables are available in a kit that must be used to connect the following three
cables to the Enhanced Common PC board:
•
MICR Read Head Cable
•
MICR Buckhead Cable
•
MICR Solenoid Cable
See “Appendix C: Common PC Board and Extender Cables” for more information about
the extender cables. See the Parts Information Manual for the kit number.
Caution: Electro Static Discharge may damage the PC board. Wear a grounded wrist strap
and use a static mat or other ESD protected work surface whenever you work with the PC
board.
1. Remove the following cables by gently tugging on the connector:
•
Receipt feed motor cable
•
Receipt low sensor cable
•
Receipt exhaust switch cable
•
Knife motor cable (knife unit)
•
Printhead ground strap (connected to ZIF connector)
2. Remove the flat, thermal printer cable from the 30-pin ZIF connector.
a. Carefully pry up the outer shell of the ZIF connector with a screwdriver.
b. Remove the flat flex cable from the connector, leaving the inner white connector
attached to the PC board.