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KEYPAD TEST

FIG. 49

This diagnostic is used to verify Keypad operation and the Microboard’s ability to respond to a pressed key. Refer to description of Keypad operation in Section 5 of this book.

Procedure

1.Press each keypad key. As the key is pressed, an illuminated LED is displayed corresponding to the key location on the keypad.

2.Press the DIAGNOSTICS key to return to the MAIN DIAGNOSTICS Screen.

Troubleshooting

If an LED is not displayed when a key is pressed, the Keypad, Keypad ribbon cable or Microboard could be defective. Use the following procedure to locate the defective component.

1.Keypad

a.Disconnect the ribbon cable from the Keypad.

b.Identify row/column coordinate of the key to be tested. Refer to Figure 46.

00568VIPC

c. In the Keypad connector, locate the pins of the row/column coordinate of the key of the key to be tested.

d. Insert the leads of an Ohmmeter into the pins identified in step “c” above.

e. Press the key to be tested. If the contact resistance is >100 Ohms, the Keypad is defec- tive.

f. Release the key. If the contact resistance is < 1 Meg Ohm, the Keypad is defective.

2.Ribbon Cable

Using an Ohmmeter, perform a continuity test on all conductors in the ribbon cable. An open circuit would indicate the ribbon Cable is defective.

3.Microboard

There are no checks or measurements to be made on the Microboard. If the Keypad and Ribbon Cable check OK per the above procedures, the Microboard is most likely the cause of the problem.

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YORK INTERNATIONAL

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York 00497VIP manual Keypad Test
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00497VIP specifications

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