ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hey everyone, I picked up a Beocenter 9000 of craigslist for cheap, knowing that it wasn't fully functional. When plugged in, I can hear a few clicks from the relays, and sometimes, but not always, the tape spindles start spinning. Otherwise there is nothing else. Anyone have any ideas on where I should start, or has seen a possilbe solution to this? It is such a gorgeous piece, I'd love to get it back to working condition. I've searched a few other threads, but a lot just trail off.
Thanks,
Max
Welcome to Beoworld !
First thing would be a check for clean voltages from the power supply. Check the voltages and the amount (and frequency) of ripple.Next would be to check the reset circuit for the processor. Without a well-defined and proper timed reset, things willnot go right.
Martin
After doing some minor proding, I've found that C5 on PCB 62 is reading OV. Possible explanation or symptom of something else.
Thanks for the quick reply! I don't have an easy spec sheet I can work off of. Could you possibly give a little detail as to how I would go about this?
hi, it's easy
You must check the dc voltage on pin of eeprom, you must have +5v on main processor
if no, you need to pull out the cd to have access to power supply, there are bad soldering on the 4 capacitors, the + positive at the center of them
if you have +5v your problem is inside the calculator
it can be a lot of things inside!
Sorry for my ignorance, but where would the reset circuit and eeprom? Replace the cap, but no luck, although the tape spindle now doesnt stay spinning.
Sorry for asking this, but do you have any education in electronics ?From the questions you ask, it could seem that this task is not for you.
I'm more used to working on 60-70s stereo equipment, so no computers are not my forte. I was hoping to get a rough idea what was wrong, if I could fix it, or not and have to take it to a repair shop, however I am not near many.
Kind of posting this for posterity, but finally got a schematic and actual time to work on it. Replaced C5,6, and 12 and am waiting for C17 in the mail. V across P50,4 shows ~4.5V (low). CD does a little start up movement, and I had response form my beolink 1000, it would start and stop the tape spindle.
This thread was helpful, but alas, nothing tried has worked for me, aside from yet getting C17. No test, or the tried reset. Still have to check out TR15,16 as suggested.