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Forum Index : Electronics : 2x Pioneer cassette decks I am trying to fix...
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Hi all. I got given two Pioneer stereos to try to fix, and am hoping to make them live again. BOTH have EXACTLY the same cassette deck faults. One stereo is a DC-Z92, the other is a DC-Z82. Both have the same cassette deck mechanism, which is a dual cassette deck. Deck 1 on the Z92 unit DOES FF or REW, but deck 2 does not. Both decks on the Z82 unit do nothing at all but click. Pulling them apart reveals that they are solenoid controlled decks, with tact-button type controls. Pressing PLAY(either direction) results in a click, the motor spins, the flywheels turn, but nothing engages and as the deck then shuts off after TWO SECONDS, there is very little time to try to analyze what the problem actually is. I much prefer the old mechanical decks, cos at least you can push the machanical controls and see what is happening, and what is supposed to be engaging and when. These bloody MCU-controlled solenoid driven decks......irritate me - lets just leave it at that. I have no service manuals for either of these, so I am hoping that someone reading this may have come across either of those models before, and can suggest what is going on. Both decks belts seem fine, the motors and flywheels spin, but they just won't engage into play mode - or FF/REW, but cos they auto-stop after 2s, it makes it really hard to know what is actually causing the fault.  Can anyone off any suggestions? Perhaps someone has fixed these before and can tell me what is going on? Perhaps someone has access to service-manuals for these models? Smoke makes things work. When the smoke gets out, it stops! |
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
Google search for "pioneer dc-z82 service manual" found a few. I downloaded one for you, https://www.c-com.com.au/stuff/grogster.zip Jim VK7JH MMedit MMBasic Help |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Geez.......why didn't I think of that?! (rhetorical!) Gawd..... Had my head inside the bloody thing for too long to think of something that simple. Thanks Jim.  Smoke makes things work. When the smoke gets out, it stops! |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
My first guess is there is a sensor on the flywheel that is used to set the speed. If that sensor has gone belly up, the motor shuts down. Opto or hall effect. Happened to a car I had once. VK7JH MMedit MMBasic Help |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
You may well be right. Part #1 on both decks is "Hall IC"(page 11 or 12), and it is indeed mounted in close proximity to one of the flywheels. I will concentrate my efforts in this area first. Strange how ALL FOUR decks on two units are showing the same issue, but I suppose if that was a problem spot for that series of deck..... If anyone else has any suggestions, please feel free to post them. Smoke makes things work. When the smoke gets out, it stops! |
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| pd-- Senior Member  Joined: 11/12/2020 Location: AustraliaPosts: 122 |
Gears tend to be a problem . the plastic shrinks and then the gear cracks and spins on the shaft theirs an item listed as 7 , 69 cam gear i would be looking for what makes the sliding parts of the mechanism move. good luck its a monster |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Thanks pd--, and that makes sense. I've been studying the exploded diagrams of the mechs, and yes indeed, I would expect that the solenoids are used to pull in that cam gears(7 & 69) at certain times. The cam gear will engage with the teeth on the edge of the flywheel, and the flywheel will then drive the mech into the loaded position etc. If the cam was loose on its shaft as you say, it would become misaligned and so not engage when the solenoid tries. That is also backed up by deck #1 on the first unit - it DOES still FF/REW, but it will not play. The other unit, neither deck will do anything. What I am getting at is that deck #1 on unit one - the FF/REW cam is obviously working correctly, but the PLAY/STOP cam must have moved or cracked as you say. That is all starting to make a lot of sense. Weather it is WORTH the cost to disassemble the deck to get to these bits - and do it FOUR TIMES(once for each deck on two units) is another matter. And that's assuming I can get replacement cam gears, which you probably can't these days. Will be a costly repair in time alone, so I might go back to the customer and see if they REALLY want to do this, cos it could cost hundreds in labour charges alone. I think the term I am looking for here is "Prohibitively expensive" or simply "Uneconomic". Pioneer made some excellent equipment, but some of it - like these cassette decks - can be utter pigs to pull to bits and put back together again. I guess when they were new and failed, you would just outright replace the entire mech, but there is no way you can do that these days.  Bit of a tricky one, as they are attached to both stereo's, but just how far into one's bank account, does sentimental value go? Smoke makes things work. When the smoke gets out, it stops! |
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| pd-- Senior Member Joined: 11/12/2020 Location: AustraliaPosts: 122 |
pioneer usa show no parts available , but you may get lucky with one of the third party parts suppliers https://instrumentalparts.com/gear-azn1338/ or have them maid but the first one costs a bom and as you say the labor time will be horrendous. Another thing to look out for is that the grease has dried out and the extra load has stripped sum teeth of the gear Edited 2023-03-09 07:47 by pd-- |
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