Join Dave step-by-step as he attempts to find the problem with a non-booting Aiphone GF NS building intercom system. Will a reset chip make a monkey out of him?
And as always, a trap for young players is explained.
Brochure:
http://www.zsing.com/download/aiphone/gf-k.pdf
Install Manual:
http://www.aiphone.net.au/media/GFNS_Install.pdf
Setup Manual: http://www.aiphone.com/home/assets/Uploads/downloads/documents/products/instructions/GF-NS%20Progr%20Instr.pdf
Datasheets:
Mitsubishi M16C: http://pdf.datasheetcatalog.com/datasheet/MitsubishiElectricCorporation/mXuuxwr.pdf
24LC128 EEPROM: http://ww1.microchip.com/downloads/en/DeviceDoc/21191s.pdf
RS232 driver: http://www.ti.com/lit/ds/symlink/ds14c232.pdf
EEVblog Main Web Site: http://www.eevblog.com
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http://www.patreon.com/eevblog
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http://astore.amazon.com/eevblogstore-20
Donations:
http://www.eevblog.com/donations/
Projects:
http://www.eevblog.com/projects/
Electronics Info Wiki:
http://www.eevblog.com/wiki/
And as always, a trap for young players is explained.
Brochure:
http://www.zsing.com/download/aiphone/gf-k.pdf
Install Manual:
http://www.aiphone.net.au/media/GFNS_Install.pdf
Setup Manual: http://www.aiphone.com/home/assets/Uploads/downloads/documents/products/instructions/GF-NS%20Progr%20Instr.pdf
Datasheets:
Mitsubishi M16C: http://pdf.datasheetcatalog.com/datasheet/MitsubishiElectricCorporation/mXuuxwr.pdf
24LC128 EEPROM: http://ww1.microchip.com/downloads/en/DeviceDoc/21191s.pdf
RS232 driver: http://www.ti.com/lit/ds/symlink/ds14c232.pdf
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
Support the EEVblog through Patreon!
http://www.patreon.com/eevblog
EEVblog Amazon Store (Dave gets a cut):
http://astore.amazon.com/eevblogstore-20
Donations:
http://www.eevblog.com/donations/
Projects:
http://www.eevblog.com/projects/
Electronics Info Wiki:
http://www.eevblog.com/wiki/
Done.
maybe that needed some delay time before pewersytem on to release reset…a simple d5second monoestable could fix that
If you're struggling to read part numbers that are waterproof coated, like in the video, try using light of just a single wavelength. You can pick up red, green, blue laser pointers, and so IR bulbs and UV lights can be used. Just trial and error, but it's handy to have at least one of each in your workshop. They are really cheap and can be extremely handy in reading difficult things. You'll be amazed how some things look like they have no writing on but under the correct sort of light appear crystal clear.
Hi David, I noticed on the scope trace that there's a triangle ripple voltage on the 5 volt supply, have you checked the rs232 chip as it may use a charge pump to drive the 232 line, maybe a faulty 232 driver chip or charge pump capacitor?
Very informative video Dave, you gave a good attempt at repairing it!
Just wondering… did you put DIP switch #1 back into the correct position after you tried the reset? Also, it might have been worth seeing if the processor was temperature-sensitive, which would rule out other parts of the cct maybe.
You've left the #1 DIP switch ON again though. Doesn't that keep it low?
So this is one of the first iPhones?
You’re still a rockstar Dave! Never would’ve gotten to the resistor pull-up/pull down whatever it was.
I'm sure you probably did off camera, but did you check the supply at the processor? Possibly being powered through the reset pin because no supply at the vcc pin?
I loved watching this video as it followed my technique but maybe in a different order . I always go for supply then reset then data to display .thanks for a great video
Did you debug that bug?
ouch 5 for 5, watched 5 repair vids in a row, 5 inconclusive or unfortunate endings. ouch 🙂
Crusty wires?
Dave is looking to knock his rent down for a month with this job!
WILD ROLLER COASTER RIDE… Please let me off 😩 But that's reality. 99% repaired works for me. Thanks
This means that the LCD Display is initialized. Power up the LCD the first Line is not visible but after the Command Power ON this will displayed. The Cursor is not at position 1 – left upper first line. Measure the EEPROM first that looks like a death counter. If you measure a Communication on the EEPROM first after Reset and then show nothing on the LCD you could be sure it depend on the information in the EE. If you have a younger System like this you can copy the information from the other 2nd System to this EEPROM and you'll see that is working. I think so I have a problem like this in a other System the System was from a Time Stamp Company.
Naice your video am standing wery happy
So you fix it so you can give it back to the building manager and tell him how you fixed it in ten minutes. Lol!
I hope you pointed to this video when you invoiced the strata manager.
That wasn't a bug, it was a baby cockroach in its egg.
"Please excuse the crudity of my finger, I didn't have time for moisturizer or to paint it."