Last days I cleared the basement and binned tons of old stuff... but what I found to my surprise was my first and only Walkman I ever had, an Elta 5970. AM/FM Radio, 4-band equaliser, built in speakers (they do not deserved the name "speaker") and record function. I used it heavily back those days and it still has parts of my Garfield stickers on it. Well, it had seen much better days. In my juvenility I disassembled the thing for whatever reason (out of curiosity?), broke almost all cables and it ended up as all my stuff I failed on ended up... in plastic bags It must be there since 1986 when I used it the last time after my holidays at Crete. Well, I thought I give it a try and repair it although unable to find a service manual to get an idea where all the broken cables have to be mounted to. However, I figured it out after some time where the cables need to be connected to and repaired the thing. Replaced most of the cables, cleaned up everything, repaired some broken joints and potentiometers. It is working now but need a recap and new belts. Also got all the buttons but lost all screws and the DC connector is missing. Elta has been a German company which sold imported products form South Korea. Maybe anyone has seen if this one sold by another company? Would help to identify the manufacturer and to get the service manual? now its working again...
Congrats ! Another one saved , it looks sturdy with a proper capstan and motor and the pcb looks it means business . Guaranteed that it wont help find the service manual , nevertheless you can search for ( even for the fun of it ) : -ESC (Electronic Sports Collection) model (?) : High Tech 3000E this looks identical to yours. -Broksonic Tsg-45 with similar layout . -Matsui PH6182 RSP similar layout different radio scale placement. In one of your pictures can be seen something that looks like a pcb model number maybe there is a supplier logo around it , I recall that way I had found years ago , the supplier/manufacturer but not the service manual of the Universum city bummler made in Korea for Quelle , same category as yours , a walkman with tiny speakers on the back , although that too is a long shot. Your best bet is the basic schematics on the datasheets of the IC's , for very limited reference truth is , but you don't need me to tell you that. Then next time you visit Greece bring it here with you again ! Edited to add these links : https://www.retrothing.com/2010/09/hi-tech-walkman-rip-off.html http://allthebeesaredead.blogspot.com/2010/10/my-old-80s-personal-stereo-walkman.html
Actually for a mickey mouse unit that looks very well built, the flywheel looks huge for a walkman, nice save dude
Guys you are awesome! There is always someone who know this old stuff thank you! Unbelievable that it was possible to buy the Broksonic a couple of years ago. It looks almost indent, maybe it represents a new revision? The pause switch and power led is missing on my unit, even not on existing on the PCB. But it is exactly ident with the Hi-Tech 3000E. I was already searching for the model number on the PCB, it points out "JC-510" and "JC-510EQ" but this was not helpful. Always leads to a Sharp Walkman but they are different. Anyway, I ordered a set of standard belts and a bunch of caps to replace them.
Ok , I'm almost certain that these numbers refer to specific models probably for the initial brand , JC-510 for the so to speak base model and JC-510EQ for the same model plus the equalizer . A common practice , Sony used it a lot in walkmans , depending on features the model number changes but they share the same pcb with the compatible models printed on it , very useful during manufacturing and spare parts department if there was such thing in this case. Fiddling a bit with these numbers came up with : ACIKO AWR-521 an almost identical twin destined for the German language countries and Techstar JC-530 this one departs from the Elta-5970 , it has still speakers on the back , what's interesting is that there is not obvious reason why " JC " was chosen , it could be anything but I wouldn't be surprised if its pcb has printed on it JC-530. Of course all this still not very useful to find service manual or schematics but it was interesting to dig into this largely unknown walkmans.
Finally replaced all the capacitors. Bloody hell, never again, what a pain! Used some other belts and basically it is working stable. Unfortunately there is a low noise from the capstan in the speakers. Cannot remember if this is normal. Well I cannot remember what I did 5 minutes ago, how should I know things after 35 years. Grounds are fine and the signal to the capstan is stable without disruptions. Any ideas? There is still one cable which I have no clue where it should go. All functions are working, except the micro - which is missing. So maybe the cable belongs there. And I tried to find where the antenna has to be connected but unable to find it. Just used the AN7222 datasheet to trace the pins but failed. Currently it would be possible for me to buy a 3000E, maybe I should do this, not sure if it is worth all the efforts...
Certainly that was a lot of work ! Don't know if you came across this schematic (see attachment) , if not it might be helpful . I guess you mean noise from the motor when referring to capstan noise , in that case there may be a noise filtering ceramic capacitor across the leads of the motor that is out of range , sometimes it is inside the motors shield (not suggesting to open it though) . Another configuration is a capacitor to each lead of the motor and the other ends of the capacitors connected to the motors shield , I don't recall that in a walkman but is also effective . Appropriate capacitor values may need some search.
