Problème Sharp PC-1500

[javitopo]

Première excuses pour mon français, je utiliser Google traslator

Je l'ai acheté une calculatrice Sharp PC-1500 ne fonctionne pas, quand je ouvert a une sorte de caoutchouc qui a fondu et souillée partie de la carte mère et certains composants.

Je mets faible les photos.
Y at-il une solution?
Comment est-il propre?
Puis-je remplacer le caoutchouc avec un nouveau?
Puis-je supprimer le caoutchouc?

Merci beaucoup pour l'aide

[Rom1500]

You're welcome !
Could you add a presentation post here ?
viewforum.php?f=49

You can remove the black "glue".
The problem is somewhere else.

The first thing to do is a hard reset.
Put the batteries in, hold the "ON" key and simultaneously press, with a pen, the reset button (under the PC-1500).
Wait 3 seconds… and… ? Is it ok ?

If not then check the power between the black and red cables coming from the battery compartment.
You should have 6V.

Do i read correctly the firmware revision on the LCD/Keyboard board : A04
It's on the flatpack chip SC613128.
If it's A04 you have the latest firmware.

For more informations about this pocket computer visit my website : http://www.PC-1500.info
And don't forget to visit http://www.PC1500.com to get some nice software.

[javitopo]

Thank you very much for your help Rom1500

I did a hard reset, but no luck, is dead
I checked the power and effectively I have 6V

Effectively firmware revision is A04 thanks for the info

Any ideas to resurrect the calculator?

Congratulations for your website has a lot of interesting information.

[Rom1500]

Thank you, i have lot of information to publish about the PC-1500

Maybe you can disconnect the two boards and reconnect.
Remove the two metal clips, disconnect the orange flat cables, ensure the onboard contacts are clean, and reconnect, put the clips… and pray !
This pocket computer is nearly indestructible.

[destroyedlolo]

This pocket computer is nearly indestructible.

But mine as its memories died.

D'ailleurs (on en avait discuté ), toujours partant pour une operation "sauvegarde" de la bete ?

[Rom1500]

Oui, je peux changer la mémoire qui pose problème.
J'ai déjà fait l'opération en direct live pour CGH.
Dis-moi en MP quand tu veux faire ça.

[cgh]

Oui, je peux changer la mémoire qui pose problème.
J'ai déjà fait l'opération en direct live pour CGH.
Dis-moi en MP quand tu veux faire ça.

Yes ! Boulot Nickel Merci encore ...

[javitopo]

No luck, does not work.
I put new photos, to see if there are new ideas to repair

Also I have the interface Sarph CE-150 but does not have charger. What charger should I look? Any link to a store?

Thanks

[edit modo] pics too large, use links or thumbnails [/edit modo]
http://i58.tinypic.com/20supgn.jpg
http://i59.tinypic.com/2cxvyte.jpg
http://i59.tinypic.com/m7vyx2.jpg
http://i57.tinypic.com/b4gq42.jpg
http://i58.tinypic.com/15i2jck.jpg
http://i61.tinypic.com/hrk744.jpg
http://i62.tinypic.com/2iho6tw.jpg

[javitopo]

Rom1500 on your website, I found the answer to the charger CE-150

http://www.pc-1500.info/2014/10/10/powe ... /#comments

[Rom1500]

Here is it : http://www.ebay.fr/itm/EU-AC-DC-9V-1A-S ... 2c6a7e3779

I can't see anything wrong on your pictures… maybe the hybrid component that manages the power…
Can you take the voltage at a ram components like the TC5514P ? On VDD pin. You should have 5v
http://www.datasheetlib.com/datasheet/2 ... uctor.html

[javitopo]

New discovery

The calculator works well with external power, only failure with battery
But with batteries I measured the 2 cables and had 6V

Any idea to fix with the new data?

[Rom1500]

That's a good news !!!
Look in the TRM, page 88 and you will have the solution : the ISS98 diode seems to be dead.
http://www.pc-1500.info/2015/03/29/shar ... ce-manual/
Maybe the blue one one this picture (bottom)
http://fr.tinypic.com/view.php?pic=m7vy ... hAGUen02Ho

Indestructible…

[javitopo]

Thanks for your help

Unfortunately I have no knowledge in electronics but I like to experiment.
Is this the ISS98 diode ?

[Rom1500]

No, this is the Crystal for the CPU clock.

This seems to be the diode with the blue ring, under the power connector :

Check with the red wire connection to find if it's this diode.

The ISS98 diode is a Schottky Diode.
You can temporarily replace it by a common 1N4148.