HP48SX seems fully functional won't run SELF TESTS?

[Bruce Larrabee]

Hi everyone,

Okay got this HP48SX. SO far it seems fully functional. But, I am unable to run any of the self tests. I am not experienced with this model. Can anyone explain this?

Thanks so much folks.

[Bruce Larrabee]

Sorry folks, false alarm! I'm an idiot! Unit passes all tests!
Thanks again and sorry...

[Luiz C. Vieira (Brazil)]

Hi.

First, get ready to use the following keys: [ON], [E] and [C]. Procedure is as follows:

- press and hold [ON];

- while holding [ON] pressed, press and release [E];

- release [ON].

it starts a cyclic self test, with patterns and messages that should lead to a

[HP48SX OK! | | | ]

and start all over again. To stop it, you need a system halt (no memory clear with this procedure, only stack levels are cleared):

- press and hold [ON];

- while holding [ON] pressed, press and release [C];

- release [ON].

That should do. Do you believe a keyboard test is needed as well?

Cheers.

Luiz (Brazil)

[Luiz C. Vieira (Brazil)]

Nah... I'd clear it but will let it here. Just in case...

[Bruce Larrabee]

Thanks so much Luiz. I didn't understand the key sequences for the self tests. After thinking about it for a while I figured them out.

It is passing all of the tests!

Thanks again.

[Luiz C. Vieira (Brazil)]

Good news, indeed!

Never mind asking, it's better knowing what to do correctly than trying on with no guidance.

Cheers.

Luiz (Brazil)