American Dynamics AD1981 Spezifikationen PDF herunterladen (Seite 14)

Connection and Setup of the AD2079 2-5

Built-in Keyboard Operations Test

CAUTION !

The following procedures expose internal electrical components

and should be performed by qualified service personnel only.

The AD2079 has built-in test capability to verify the operational integrity of the unit's hardware

and firmware. Built-in test functions include the following:

• speaker test

• LED lamp test

• LED brightness test

• LED seven segment test

• joystick calibration / speed test

• key functionality test

• keyswitch test

• serial communications test

• ROM checksum test

Procedure to Initiate Built-In Test

1. Unplug the keyboard's wall transformer.

2. Disconnect the matrix switching system's modular cable from the dual terminal block (J2).

3. Connect a jumper wire to pins 4 and 5 on the J1 side of the dual terminal block.

4. Detach the bottom plate of the keyboard by removing the four screws.

5. Press and hold down the button labeled "test switch", while simultaneously plugging in the

wall transformer.

Each of the tests is performed in sequence. Press the test switch button to advance to the next test

procedure. To quit the test sequence, unplug and then re-plug the wall transformer.

2079 KEYBOARD

UNDERSIDE

TRANSFORMER

XMIT/RCD SELF-TEST

JUMPER CONNECTION

MODULAR CABLE

DUAL TERMINAL BLOCK

TEST SWITCH

DO NOT CONNECT TO SYSTEM

DURING BUILT-IN TEST

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American Dynamics AD1981 Spezifikationen Seite 14