Sharp MZ-3500 service manual Keyboard controller ROM test, Keyboard test

MZ3500

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11-3. Keyboard unit test functions

1)Keyboard controller ROM test

(1)After power on in a normal condition, it starts to carry out the ROMself-test.

If the alpha/symbol (LOCK) LED were to turn on, it indicates a failure in KBC. If not, KBC is satisfactory. t Key self check functional specification (simplified check)

2)Keyboard test

(1)As the power is turned on with the "DEB" in depres- sion, it goes into the keyboard self-test mode.

(2)Depress key in a given sequence. If key is depressed in a correct sequence, it makes the alpha/symbol (LOCK) LED activated each time a key is pushed.

If the key was pushed in a wrong sequence or when a failure is met in the key, it makes the LED blinked.-

(3)It returns to the normal mode upon completion of testing all keys. With this, the LED goes out.

(4)Observe the following key-in sequence to test.

i)Turn the OP/PRO siwtch to the OP side.

ii)Turn on power while pushing the "DEB" key.

iii)Turn the PO/PRO which to the PROside.

iv)Push a key one at a time in accordance with the given sequence.

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