Axiohm 7156 Especificações descarregar pdf (Página 17)

Chapter 2: Troubleshooting 9

printer and the monitor, and an angular orientation of the monitor to

the printer.

Improper System Ground Bonding

The metal structures and the logic and power grounds in the printer

must be securely bonded together and electrically connected to the

system ground at the host. The bonding path includes the

communication cable connecting the printer to the host.

Ground Testpoint (GND)

Power

Ground

Testpoint

(PGND)

To test the ground bonding, remove the top cover of the printer and

disconnect all cables, including the power supply, except the

communication interface which is to be connected as normally

required between the printer and the host. Measure the resistance

between the power ground (PGND) or logic ground (GND) and the

control board’s steel shield with the interface cable still connected to

the printer and the host. The test points are shown in the illustration

above. The exact location of test points may vary depending on your

printer model. The resistance must be less than 5 ohms; if the

resistance is greater then 5 ohms, repair the open fault and then repeat

the MICR read test.

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Axiohm 7156 Especificações Página 17