Sharp MZ-3500 - Manual (Page 95)

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 ROM self-test.
If the alpha/symbol (LOCK) LED were to turn on, it
indicates a failure in KBC. If not, KBC is satisfactory. /
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.
) Turn the OP/PRO siwtch to the OP side.
i) Turn on power while pushing the "DEB" key.
ii) Turn the PO/PRO which to the PRO side.
v) Push a key one at a time in accordance with the given
sequence.
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