Axus PA-08 Manual de Serviço descarregar pdf (Página 69)

SERVICE MANUAL TNC 415B/425

Page 64

Issue: 20.08.95

11.2 Checking the Keyboard Unit

The keyboard unit can be checked fast and reliably with the measuring adapter.

11.2.1 Checking the Key Functions

Proceeding:

Observe the safety instructions!

• Switch off the main switch.

• Disconnect the keyboard unit from the LE and connect the measuring adapter (see section 20) to

the keyboard unit.

Now the contacts of the keys can be measured at the measuring adapter with an Ohmmeter.

If e.g.

PGM

is pressed at the TNC operating panel, approx. 1 Ω can be measured at the adapter between

PIN 8 and PIN 24 (see key matrix, section 11.2.3 and 11.2.4); consider the resistance of the testing wires.

11.2.2 Measuring Setup for Checking the Functions of the NC-Keys

multimeter

X1 (9-pin)

X2 (37-pin)

BC 110/B

test adapter

Ω

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Axus PA-08 Manual de Serviço Página 69