I like watching these videos. They bring back fond memories as I'm a retired service tech. in the uk. I also like the fact that you use the correct pronunciation of the word solder. So many in the US forget the "L" and say " soder". It grates on the ears so for that fact I like you. Regards Bob.
That's because I am Canadian. We also pronounce roof correct not "ruff" as our neighbours to the south do, and we spell colour correctly even though my spell corrector is complaining every time I type it that way!
I not discouraged despite not write off on my first post asking for repair tv and replied that as you try to help others as soon as you have the time and stories already known faults :D - I have the impression that you like what you're doing and respect in your page by closing an eye on the injured English. sorry about that. P.s For my part I compared You to my father in law who has a passion for electronics and I also learned a little. Thanks for that and a willingness to share.
Thanks, another great repair - really enjoyed it. It always impresses me that you never seem to lose any of the little screws or get them mixed up when putting the gadget back together :-) Cheers, John
As a fellow youtuber, I know the diversity of messages you must get, and I understand the need to talk about it in your videos. This repair was amazing. Keep up the great work! Cheers from Ontario. No need to reply :)
I don't mind the comments in the channel, but when people look up my phone number and actually phone me asking for advice, that is going way over the line. They also usually call over Skype or some other IP based system, that I can barely understand due to all the delays and echo, and then thrown in an accent to boot.
love the video! don't let trolls and idiots get you down. anything you do here (posting videos, answering questions) is free!! if people really need answers there are so many forums with great people who can help. You are one man (and retired at that) so people need to just back off lol! I would love to see some videos of your collections and maybe other cool stuff (unfortunately Im just not a fan of the traveling videos).
I have one of these units and with the help of your videos I was able to re-cap much of the board, clean the mechanisms, and get it working again after 20+ years of sitting. I wonder if you might have a suggestion for solving an issues though. I can now play a DAT tape but there's considerable high-frequency noise onplayback. On the DATs that I recorded decades ago, I lead the tape with 1K, 10K, and 100hz tones @ -12 db. There is considerable modulation noise in the 1K tone that is audible and also clear in the time-domain waveform for both channels when dubbed to my DAW. The modulation is not the same on the left and right channels. Might this be aliasing errors from the playback circuit? Or maybe might it be more bad capacitors? The noise is present in both the spdif and unbalanced analog outs. This makes the deck unusable so I appreciate any help you might offer. D
Question: When I see some digital recorder unit advertised as a PWM unit, is this different from a DAT unit? I know that the HiFi vcr units used pwm for audio recording but is this still “Digital” as in a DAT unit? Thanks ....
Smashing tight space repair, thankyou for an enjoyable repair :-D . They should be renamed to "Crapacitors" it would be a better discription :). Ill have to remember that devices of that age are full of crapacitors, most of the things ive repaired are younger so its mostly psu caps that ive found bad. Yes a good old linear supply :-), a couple of Lm317''s and two seperate secondary windings would be my way. The lm317 is my favorite along with the 78XX series.
Hi there 12voltvids! Thanks for making this video. I am currently working on a Casio DA-7 (which is the parent/sister model of the unit in the video). Looks like I'm going to have to re-cap the board now that I've gotten power to the unit. BTW, I found a 3 pin connector that does work well...I took an LED on connector from an old computer (two pins wired, used the third connection for ground). That power connector is near impossible to find!
I lucked out as a viewer sent me one from Australia. Was set up for 240V, so I built a dual voltage +7-7 supply and "made it fit" into the original power adapter case with the creative use of zap straps. Works great. I now have 2 units, but robbed the pinch roller out of this one to fix the other one as it was in better cosmetic shape. This one now is a parts spare.
Hi, a question watching your video.I have a Dat Casio Da7 that has a single defect and does not rewind the tape while instead it records, plays and FF perfectly: it makes sense in your opinion to replace all these capacitors or the problem is of other type? Thank you!
I have a Panasonic SV-255 portable DAT machine that is doing pretty much the same as yours. When you load a tape, the head drum (this unit has the small, not full sized DAT head drum) is just spinning very slowly when you press play. I had not used this deck in 8 years, and it was working perfectly last time I used it. Do you think it's probably caps like in the one you just repaired? Wanna make another video? :-)
I'm the current custodian of SN 003389, it's box and accessories. It needs check/adjustment with TY-7551 - wondering where I can find it... I got it as a previously repaired "for parts" special, not even recognizing any tape. After complete refurbishment I've gotten it to look and sound okay now, just the odd error and the cylinder and clock pulse synchronicity is very likely off. If I can find/rent/borrow the test tapes I'd be very happy.
wow! I don't see how you crammed all that in that little space. I wish I could do that sort of stuff. and how did you remember how to put that back together? lol very cool indeed!!!
I have a pair of portable NXT flat speakers and I have an MP3 player and cartoon video viewer called a juiceBox and all three devices have the same issue with decomposing plastic and I'm not sure how to get rid of it. I might try this b/c Goo Gone doesn't seem to work well. Nice fix on this machine. I had a Bose Wave Radio and I had it playing and the audio just faded away to nothing. Tried to fix the caps but ended up junking it. Kept the speakers/waveguide channel. And I do still hear some glitching in the audio of this machine but it's lots better than when you got it.
I do answer many comments on the channel.I di get many more questions sent as private email. I answer what I can, but some days I receive 80-100 messages, and just don't have time to give everyone a personal response.
+12voltvids that's understandable I don't expect you to answer right away but you are pretty good at responding. By the way I liked this video DAT systems are pretty cool.
Tantalums never fail? Your kidding right. That's why I didn't have to change 50+ caps in all those Sony SL5000 Betamax units in the 80's. They use Sanyo tantalum caps, and they all went bad and caused major servo problems (capstan and drum motors hunting for speed lock)
And one question from this video: original caps was 6,3V and 10mkf and you changed to 25V 10mkf. It is good for that voltage difference? Or it was 2,5V capacitors?
+12voltvids wow that was fast answer. :) In this setting it is not important voltage diference? I had this model that you are repairing and something wrong with mine. It wont turn on after capacitors replacement. Soldering was good. Capacitor changed and nothing changed. So i donated this device.. Good video. Keep on going. :)
@@heris30 I know it's late but the voltage rating on a capacitor is it's "maximum voltage" - exceed this and it's likely to fail. Higher voltage capacitors use beefier insides (like the foil/insulator inside might be thicker) which usually means a higher voltage cap will have a larger physical size or possible higher ESR rating if equivalent physical size. The voltage a capacitor will see/charge to is dependent on the circuit that charges it.
Hi, nice video, many thanks.. Just one thing. i noticed you replaced almost all SMD capacitors, but not two of them, wich you checked with mutimeter and they seemed to be ok.. But i think it is better to replace them,too ;-)
Hi there. I own one of these and yep, when it arrived - it was all gummed up with that awful coating. The surface mount electrolytic caps were all gone so the mechanism had no strength to do anything. I replaced the surface mount caps with new ones, and where possible I would replace them with regular electrolytic caps. I had the battery reconditioned and I was able to get over 2 hours of recording on it. The microphone preamp was noisy, and there was a mod you can download from the net to improve the audio performance. Here is the website web.aanet.com.au/gwg/DAP20mods.html The only problem left with this unit was the pinch roller. I think the material it was made of was similar to the material they used on the outside. I had to clean the pinch roller every time I wanted to use it, otherwise it would ruin any tape I used in it. Cheers.
Hello m8, wonder if you could give me some advice, i have a Sony TA-636 stereo power amplifier and the MIC socket/reverb isnt working, but everything else works 100% and sounds beautiful could you give me a basic pointer as to where to look for the fault, thanks m8. i have the schematic for the amp.
OK IC402 is your mic preamp, and reverb circuit. It is powered with a +15 v supply on pin 8, and a -15v supply on pin 4.These power rails trace back to fusable resistors R505 and R506, and voltage is regulated by 2 zener diodes D507 and D508, with finter capacitors C510 and 511. Check these voltages. If one is missing or low this will cause a problem.
Hello again, ive taken her apart and i tell ya its like a jungle in there, ive located the parts you said but to take the board out it seems i will have to totally strip the amp down, the amp ic's are hard soldered with ribbon dammit, you are right about the fault causing problems as one of the display lamps isnt getting any voltage either ther other one works though theres 2 of them.
The Casio DA-2 / DA-7, Denon DTR-100, and the TEAC DA-P20 don't have a internal DC/DC converter, like the Sony TCD-D3 or other portable Sony DAT. This is the why Casio use a boring dual voltage power adapter. The economic way.
I know you're busy as you said. I would love to see how much "little" work would need to be done to get it running...not replacing all of them, but just a few caps to get it working. Something to do some day?
12voltvids, it was a very educational and informative vid :-) Now I have the Casio DA-2 DAT recorder which seems to be exactly the same machine and circuit board. I have changed the caps in the head preamp but not the single one on the main board and I get digital garbled signal and dropouts. Do you think I should change all caps on the main board to? Maybe I have issue with the rotary tape head? The mekanism is still solid and I would love to get life in to my Casio, what is your advice? I love your shows and your ability to present electric stuff and repair them with ease and useful comments ! :-)) Keep up the good work sir!!
Yes the ones on the main board will be the problem. That is the servo board. You are getting the digital noise because the capstan motor is not running at the correct speed.
I have 2 Panasonic Plasma sets here I fixed. One had a handful of parts on the SS board that failed because they forgot to put lock washers on the screws that hold the SS board in place. The screws get loose, cause arcing, and blow parts.Of course Samsung is also guilty of this shoddy construction.
I have had to change more buffer ICs on the buffer boards than I can count. I wont EVER do that again! What a pain... and the silicone sealant for the pins is a MUST. Grrr....
I like watching these videos. They bring back fond memories as I'm a retired service tech. in the uk. I also like the fact that you use the correct pronunciation of the word solder. So many in the US forget the "L" and say " soder". It grates on the ears so for that fact I like you. Regards Bob.
That's because I am Canadian. We also pronounce roof correct not "ruff" as our neighbours to the south do, and we spell colour correctly even though my spell corrector is complaining every time I type it that way!
+12voltvids I do apologise. I hope I didn't insult you too much.
I have teenagers at home. Nothing insults me!
I not discouraged despite not write off on my first post asking for repair tv
and replied that as you try to help others as soon as you have the time and stories already known faults :D
- I have the impression that you like what you're doing and respect in your page by closing an eye on the injured English.
sorry about that.
P.s
For my part I compared You to my father in law who has a passion for electronics and I also learned a little.
Thanks for that and a willingness to share.
Thanks, another great repair - really enjoyed it. It always impresses me that you never seem to lose any of the little screws or get them mixed up when putting the gadget back together :-)
Cheers, John
As a fellow youtuber, I know the diversity of messages you must get, and I understand the need to talk about it in your videos. This repair was amazing. Keep up the great work! Cheers from Ontario. No need to reply :)
I don't mind the comments in the channel, but when people look up my phone number and actually phone me asking for advice, that is going way over the line. They also usually call over Skype or some other IP based system, that I can barely understand due to all the delays and echo, and then thrown in an accent to boot.
love the video! don't let trolls and idiots get you down. anything you do here (posting videos, answering questions) is free!! if people really need answers there are so many forums with great people who can help. You are one man (and retired at that) so people need to just back off lol! I would love to see some videos of your collections and maybe other cool stuff (unfortunately Im just not a fan of the traveling videos).
I have one of these units and with the help of your videos I was able to re-cap much of the board, clean the mechanisms, and get it working again after 20+ years of sitting. I wonder if you might have a suggestion for solving an issues though. I can now play a DAT tape but there's considerable high-frequency noise onplayback. On the DATs that I recorded decades ago, I lead the tape with 1K, 10K, and 100hz tones @ -12 db. There is considerable modulation noise in the 1K tone that is audible and also clear in the time-domain waveform for both channels when dubbed to my DAW. The modulation is not the same on the left and right channels. Might this be aliasing errors from the playback circuit? Or maybe might it be more bad capacitors? The noise is present in both the spdif and unbalanced analog outs. This makes the deck unusable so I appreciate any help you might offer. D
Question: When I see some digital recorder unit advertised as a PWM unit, is this different from a DAT unit? I know that the HiFi vcr units used pwm for audio recording but is this still “Digital” as in a DAT unit? Thanks ....
Smashing tight space repair, thankyou for an enjoyable repair :-D
.
They should be renamed to "Crapacitors" it would be a better discription :).
Ill have to remember that devices of that age are full of crapacitors, most of the things ive repaired are younger so its mostly psu caps that ive found bad.
Yes a good old linear supply :-), a couple of Lm317''s and two seperate secondary windings would be my way.
The lm317 is my favorite along with the 78XX series.
I have called them that in past videos. The power supply I will build will be linear with an lm 78xx an 79xx regulatos.
Hi there 12voltvids! Thanks for making this video. I am currently working on a Casio DA-7 (which is the parent/sister model of the unit in the video). Looks like I'm going to have to re-cap the board now that I've gotten power to the unit. BTW, I found a 3 pin connector that does work well...I took an LED on connector from an old computer (two pins wired, used the third connection for ground). That power connector is near impossible to find!
I lucked out as a viewer sent me one from Australia. Was set up for 240V, so I built a dual voltage +7-7 supply and "made it fit" into the original power adapter case with the creative use of zap straps. Works great. I now have 2 units, but robbed the pinch roller out of this one to fix the other one as it was in better cosmetic shape. This one now is a parts spare.
Hi, a question watching your video.I have a Dat Casio Da7 that has a single defect and does not rewind the tape while instead it records, plays and FF perfectly: it makes sense in your opinion to replace all these capacitors or the problem is of other type? Thank you!
I have a Panasonic SV-255 portable DAT machine that is doing pretty much the same as yours. When you load a tape, the head drum (this unit has the small, not full sized DAT head drum) is just spinning very slowly when you press play. I had not used this deck in 8 years, and it was working perfectly last time I used it. Do you think it's probably caps like in the one you just repaired? Wanna make another video? :-)
I'm the current custodian of SN 003389, it's box and accessories. It needs check/adjustment with TY-7551 - wondering where I can find it... I got it as a previously repaired "for parts" special, not even recognizing any tape. After complete refurbishment I've gotten it to look and sound okay now, just the odd error and the cylinder and clock pulse synchronicity is very likely off. If I can find/rent/borrow the test tapes I'd be very happy.
Oh, that coating, which turns sticky over time.
Sony used that crap on quite a few of their products, such as some of their shelf stereos.
wow! I don't see how you crammed all that in that little space. I wish I could do that sort of stuff. and how did you remember how to put that back together? lol
very cool indeed!!!
me not like proprietary plugs. sooo, did Tandberg dole out their cheap stuff to Panasony too?
I have a pair of portable NXT flat speakers and I have an MP3 player and cartoon video viewer called a juiceBox and all three devices have the same issue with decomposing plastic and I'm not sure how to get rid of it. I might try this b/c Goo Gone doesn't seem to work well.
Nice fix on this machine. I had a Bose Wave Radio and I had it playing and the audio just faded away to nothing. Tried to fix the caps but ended up junking it. Kept the speakers/waveguide channel.
And I do still hear some glitching in the audio of this machine but it's lots better than when you got it.
Hey man you always answer me but anyways keep up the videos. I find electronics interesting and I like the stuff you repair.
I do answer many comments on the channel.I di get many more questions sent as private email. I answer what I can, but some days I receive 80-100 messages, and just don't have time to give everyone a personal response.
+12voltvids that's understandable I don't expect you to answer right away but you are pretty good at responding. By the way I liked this video DAT systems are pretty cool.
DAT should never have gone out. Or at least it should see a revival like vinyl and even cassette.
Top cleaning tip...thanks
I wonder if you could use Tantalum solid electrolytic capacitors in place of the wet electrolytic capacitors so as not to have the problem ever again.
Tantalums never fail? Your kidding right. That's why I didn't have to change 50+ caps in all those Sony SL5000 Betamax units in the 80's. They use Sanyo tantalum caps, and they all went bad and caused major servo problems (capstan and drum motors hunting for speed lock)
And one question from this video: original caps was 6,3V and 10mkf and you changed to 25V 10mkf. It is good for that voltage difference? Or it was 2,5V capacitors?
OK to go up a bit in voltage. The caps are a little larger physically, but I got em in. You can't go down in voltage if you want it to last.
+12voltvids wow that was fast answer. :) In this setting it is not important voltage diference? I had this model that you are repairing and something wrong with mine. It wont turn on after capacitors replacement. Soldering was good. Capacitor changed and nothing changed. So i donated this device.. Good video. Keep on going. :)
@@heris30 I know it's late but the voltage rating on a capacitor is it's "maximum voltage" - exceed this and it's likely to fail. Higher voltage capacitors use beefier insides (like the foil/insulator inside might be thicker) which usually means a higher voltage cap will have a larger physical size or possible higher ESR rating if equivalent physical size. The voltage a capacitor will see/charge to is dependent on the circuit that charges it.
Hi, nice video, many thanks.. Just one thing. i noticed you replaced almost all SMD capacitors, but not two of them, wich you checked with mutimeter and they seemed to be ok.. But i think it is better to replace them,too ;-)
Anyone did find proprietary 3 pin power supply connector as spares ? Many thanks
i had a radio that went sticky just like that...i had to take off all the covers and take it to the sink to try and get it off.. and it was not easy
thanks for sharing ...
Good job.
What were the values of the new capacitors you used to replace the old silver surface mounted capacitors?
The same as the ones that came out.
@@12voltvids 33uf 10V, and 22uf 16V? I have the same model and I'm trying to replace them.
@@caden564 don't remember. It was a long time ago i was into that one.
@@12voltvids No worries, thanks anyways. The video helps alot!
Hi there. I own one of these and yep, when it arrived - it was all gummed up with that awful coating. The surface mount electrolytic caps were all gone so the mechanism had no strength to do anything. I replaced the surface mount caps with new ones, and where possible I would replace them with regular electrolytic caps. I had the battery reconditioned and I was able to get over 2 hours of recording on it. The microphone preamp was noisy, and there was a mod you can download from the net to improve the audio performance. Here is the website
web.aanet.com.au/gwg/DAP20mods.html
The only problem left with this unit was the pinch roller. I think the material it was made of was similar to the material they used on the outside. I had to clean the pinch roller every time I wanted to use it, otherwise it would ruin any tape I used in it.
Cheers.
Hi. Thank you for your video I sort out My Teac.
Great
Hello m8, wonder if you could give me some advice, i have a Sony TA-636 stereo power amplifier and the MIC socket/reverb isnt working, but everything else works 100% and sounds beautiful could you give me a basic pointer as to where to look for the fault, thanks m8. i have the schematic for the amp.
I'd have to see the schematic but I would start in the microphone preamp circuit.
Thank you, the schematic is here m8, www.electronica-pt.com/esquema/func-startdown/17967/
OK IC402 is your mic preamp, and reverb circuit. It is powered with a +15 v supply on pin 8, and a -15v supply on pin 4.These power rails trace back to fusable resistors R505 and R506, and voltage is regulated by 2 zener diodes D507 and D508, with finter capacitors C510 and 511. Check these voltages. If one is missing or low this will cause a problem.
thank you so much for your help ill give it a shot and let you know how it goes
Hello again, ive taken her apart and i tell ya its like a jungle in there, ive located the parts you said but to take the board out it seems i will have to totally strip the amp down, the amp ic's are hard soldered with ribbon dammit, you are right about the fault causing problems as one of the display lamps isnt getting any voltage either ther other one works though theres 2 of them.
Cool video... Interesting... Sorry to hear you have had unappreciative fans being impatient.
Only a few. Probably the ones that thumbs down the videos.
nice one another unit back from the brink :)
The Casio DA-2 / DA-7, Denon DTR-100, and the TEAC DA-P20
don't have a internal DC/DC converter, like the Sony TCD-D3 or other portable Sony DAT.
This is the why Casio use a boring dual voltage power adapter. The economic way.
CORRECT!And they get to sell you an expensive ac adapter and battery.
12voltvids cara tu és ninja concertar walk dad é magica ! parabéns
Microsoft used to use similar coating for their mice
I think a similar type of coating was on the old Psion 5 organisers as well. Wiped that off with IPA - looked a hell of a lot better afterwards!
IBM Thinkpad did as well.
Hey don't you have a Camera that has a Butt load of those SMD caps to replace ;) "hint hint" you did say you would tackle that at a later date,.
Oh that B/W Burle. Yep still have that thing somewhere.
I know you're busy as you said. I would love to see how much "little" work would need to be done to get it running...not replacing all of them, but just a few caps to get it working.
Something to do some day?
I'm surprised there's a belt drive capstan in this.
For the reels
@@12voltvids Oh right, thanks for the clarification.
12voltvids, it was a very educational and informative vid :-) Now I have the Casio DA-2 DAT recorder which seems to be exactly the same machine and circuit board. I have changed the caps in the head preamp but not the single one on the main board and I get digital garbled signal and dropouts. Do you think I should change all caps on the main board to? Maybe I have issue with the rotary tape head? The mekanism is still solid and I would love to get life in to my Casio, what is your advice?
I love your shows and your ability to present electric stuff and repair them with ease and useful comments ! :-))
Keep up the good work sir!!
Yes the ones on the main board will be the problem. That is the servo board. You are getting the digital noise because the capstan motor is not running at the correct speed.
Cool, Thanks, you'r genius!!! :-)))
I have a DA-2 with exactly the same fault - thanks to 12voltvids, I think there's a fix !
Yup, not that hard to fix. This is a real easy unit to work on.
Weren't most of those surface mounted caps rated for 1,000 hours? Well, at least Panasonic made decent plasma sets to their credit.
I have 2 Panasonic Plasma sets here I fixed. One had a handful of parts on the SS board that failed because they forgot to put lock washers on the screws that hold the SS board in place. The screws get loose, cause arcing, and blow parts.Of course Samsung is also guilty of this shoddy construction.
I have had to change more buffer ICs on the buffer boards than I can count. I wont EVER do that again! What a pain... and the silicone sealant for the pins is a MUST. Grrr....
After long time i see your video, i understand then panasonic capacitor, are pretty crappy.
So sad......
Have you seen bad 200v caps before.
For sure. Tons of screen capacitors in tube TVs. They were typically 10uf at 250 or higher.