Marantz Square Wave Problem.
12:41
2 жыл бұрын
Basic testing of an optocoupler.
15:08
Audio Repair Form for Downloading
5:25
Watts/Voltage (Peak to Peak) Table
3:28
Watts and Voltage Table to Download
2:22
The Volume Control
8:48
4 жыл бұрын
Midpoint voltage of Marantz 2215B
10:50
Transistor Leakage Testing (ICEO )
13:46
Пікірлер
@thenumber5bus
@thenumber5bus Жыл бұрын
I think the edit button pauses tape2 for you to sort the tape1 for next playback. Mine was my late grandfathers unit and I was never allowed to touch it.way back on the late 70s and I remember it like it was yesterday. I kept mine for sentiment as the tapes just chew up tapes now
@boebrahem2497
@boebrahem2497 Жыл бұрын
Hello my brother is it for sale ?
@channel4ferrets
@channel4ferrets Жыл бұрын
Some people don't like the Sankyo mechanism in Nakamichi tape decks but they are "easy" to repair, compared to others.
@yash1one556
@yash1one556 Жыл бұрын
Thanks for the information. How about we connect cell phone with DIN 5 pin to 3.5mm jack cable will the output be good enough ?
@abdljaliltaghia824
@abdljaliltaghia824 Жыл бұрын
Please I want to know the 220v input terminals of the transformer
@MarvinHartmann452
@MarvinHartmann452 Жыл бұрын
I've that trouble on a pioneer sx-1010 tone control board, it was a 2SA725, I replaced them on both sides with ksa992, got rid of the tantalum capacitor, Matched the transistors on both sides, noise was gone.
@in_tasin
@in_tasin Жыл бұрын
Brother, I used my cd player for long but last time it didn’t respond, it had a button and a light, which is not responding even when I click the button, I can open it by using a small pin in the specific space but still it was not responding, what should I do?
@retrohale_
@retrohale_ Жыл бұрын
Looks like its not too hard to reach anything inside does it? I might buy a gf9191 today and try to repair the cassette deck.
@oldfartron1205
@oldfartron1205 Жыл бұрын
You used cheap toggle switches made in china that will not last more then 6 months, ( or do you feel lucky) ??
@cristinmorandi2815
@cristinmorandi2815 Жыл бұрын
Very good demonstration in to electronics. I have a question, is it possible to test a PC123 Optocoupler on a power supply board? Thank you.
@boofter5673
@boofter5673 Жыл бұрын
Hi, would like to know the type & voltage of the stereo indicator light? Mine finds and plays the stereo stations, but the indicator light doesn't illuminate. Great informative video.
@markantonyrodriguez7998
@markantonyrodriguez7998 Жыл бұрын
Hi , your video was so good. Actually i have a silver brand Turntable comes with the same mechanism. I removed the cam gear ,but timing changed . Now the tome arm is raised when it plays for 10 seconds. Can you pls mention the model of the turntable, which is demonstrated.Thanks.
@h.c.g3459
@h.c.g3459 Жыл бұрын
hi there, the "light" button turns on the backlight behind the led-display - but its an oldfashioned fuse-like mini lightbulb with a rubber sheet over it - they re very often burned out (after 40+ years) :) PS : the display sometimes messes up...but most often a "reset" fixes the problem - by taking out , leaving out for a few minutes and putting back the 3 AA batteries in the tube behind the D-cells :) that resets the whole thing. In my experience it solves the lcd-display issue in about 1 out of 3 times. A greaaaaat device !
@marcelaparra3323
@marcelaparra3323 Жыл бұрын
Buenos días porfa me podria indicar como funciona lo del cassete gracias
@PawelGrodkowski
@PawelGrodkowski Жыл бұрын
Moje immie jest Paul Objectiw Aby sie uczyc cos koztyne i nie szukac raj. ☢
@nickfatsis9607
@nickfatsis9607 Жыл бұрын
You could try turning up the power to the laser, this will bring the output up
@dank6372
@dank6372 Жыл бұрын
I bought mine in early 2000s and it is still with me, working good) Yesterday I picked it up from my old house and now listening for the tape) The CD tray comes out but comes back only manually, but other than that everything works as it should without any maintenance which is really surprising for me after 20 years.
@dowoppido
@dowoppido Жыл бұрын
What are the dimensions of the pinch roller? I'm trying to make sure I order the right one.
@zim2493
@zim2493 Жыл бұрын
What is the test voltage in ICEO
@AbdulKalam-bl8wg
@AbdulKalam-bl8wg Жыл бұрын
Dear sir I have a 555E and volume button and bass treble are not working please suggest me something it would be very kind of you
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
I would try to clean the the contacts with a contact spray. With the power off, of course. Spray and then work the buttons a number of times. In fact, I would do that to all controls/buttons.
@Колх-Апсуа
@Колх-Апсуа Жыл бұрын
SHARP GF- 9494x.👍
@eddysokoloff8738
@eddysokoloff8738 Жыл бұрын
Fascinating/I use cassette recorders and always wondered how a motor looked like. Thank you.
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Thanks, for your kind words and for watching.
@free1.1
@free1.1 Жыл бұрын
Hi I need a manual as well i would really appreciate it. It's been Next to impossible to find one. Thank you
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Hello. We have been vacationing. I have started looking for the service manual, but haven't found it yet.
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Looks like I found it. If you still want it, let me know.
@elielj.3542
@elielj.3542 Жыл бұрын
What if my VCR is feeding itself too much tape and gets clogged?
@hawk4366
@hawk4366 Жыл бұрын
Great video. How can I adjust the motor speed ? As mine runs a bit slow. There seems to be no adjustment hole in the back of the motor? Thanks
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Thanks. Really not too much you can do. It's probably got one of those old mechanical type governors it it doesn't have a hole or some kind of potentiometer set-up on a board. Make sure the capstan/flywheel isn't binding, make sure the pinch roller isn't binding, and your belts aren't worn, especially it they have been in there for decades. Not sure if this applies you, but If the belts have been in there for so long, why are they still in there? And also make sure to try different cassettes.
@AStrangersBaby
@AStrangersBaby Жыл бұрын
thanks for taking the time to share this knowledge!
@EJEuth
@EJEuth Жыл бұрын
Great restoration and what a patience, surely needed. About carbon track cleaning: alcohol or contact cleaner wouldn’t soften the carbon film, making it easier to be scratched off by the normal operation of the sliding/rotating contacts? Thanks for sharing! P.S.: I can’t imagine why someone would glue all potentiometers - this is crazy.
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Thanks for commenting, sir. I didn't have problems cleaning this because I worked gently. You could remove the carbon if you rubbed too hard. What has your experience been? The spray seems to have no adverse effects. That was a bizarre case of glue in the sliders. Although it was a few years ago, that boombox seemed quite worn out. Sorry that I didn't write so quick, but I am not on KZbin very much at the moment
@johnfranz8531
@johnfranz8531 Жыл бұрын
Hey, I have a Scott R-376 and when I turn the volume up slightly, the audio shuts off. I can play it at a very low volume, but when I go to turn up even 1 click, audio shorts out. A fuse would not allow any audio if it was bad, right? Any ideas?
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
You should clean the volume control for starters. Spray it while the power is off, off course. Sorry, takes me a while to respond, since I am barely on KZbin nowadays.
@TanyaRadic
@TanyaRadic Жыл бұрын
Why did u drag me through this?
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Time is precious. Don't watch till the end. Hit the stop button and have a nice day.
@mattcero1
@mattcero1 Жыл бұрын
Is an audio generator the same as a signal generator? I'm needing to get sound to come off of speakers I'm testing. What would you recommend me to get to get audio out of speakers? Thank you.
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
As the name "audio generator" implies, it puts out audible frequencies, that is, what the human ear can hear. A signal generator can go much higher in frequency. Not needed for your purpose. I would try to get a used solid-state audio generator, maybe from ebay. One of the major manufacturers such as Heathkit, Leader, HP, etc. Seems like you are just looking for something real basic.
@josephfindley4850
@josephfindley4850 Жыл бұрын
Thanks for your videos, Do you know the specs for the headphone jack impedance? How many ohms impedance should my headphones have?
@hawk4366
@hawk4366 Жыл бұрын
Any idea where I can get a set of idoler tires for this model?
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Original is not available, I believe. Try an o-ring.
@ufukguven2354
@ufukguven2354 Жыл бұрын
And what voltage comes on the meter lamp sir? Is it 6.3 volts and what is the oruginal fuse type lamp's spec? Is it 8 volt 40mA? Tuning lamps (5 of them) are 8 volts 20mA for the old ones and the new LEDs are 8 volts 200mA? Am I right? Both lamp circuits are 6.5 volts?
@ufukguven2354
@ufukguven2354 Жыл бұрын
What is the voltage that flows in those lamps in the corcuit, is it 6.3 volts that goes through those 8 volt lamps sir?
@ufukguven2354
@ufukguven2354 Жыл бұрын
I have the same amp and I need a solution to replace of the 5+1=6 dial bulbs. I think the voltage for the lighting circuit is 6.3 volts for my 110 volt Marantz 2215B amplifier. The old bulbs were 8 volt 200mA. I live in europe so the voltage here is 220 volt. And the cycle is not 60hz, it is 50hz. So should I go for LEDs that are in the video or SMD type leds? Should I wire 3 Leds on a board and use a resistor? Please help sir. Kind regards
@bigslouch7836
@bigslouch7836 Жыл бұрын
what fuse was in this?
@Ultrafrozen
@Ultrafrozen Жыл бұрын
Notice the two piece volume knob instead of a balance knob. They are friction bound together and rotate as one but can be adjusted individually to favour left or right channel with a little force.
@RRDfinland
@RRDfinland Жыл бұрын
My car ecu has ( 3T01NDK19: ) crystal quarz 2pin what herz it has? Google doesn say anything guessings k19=19.000Hz?
@Gorilla.Guitar
@Gorilla.Guitar Жыл бұрын
did i just witness somebody take a jumper lead & connect one end to cap+ & the other end to cap- to discharge it?
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Don't even remember this video, but could be, although I do have a discharge resistor. This was probably a small, low voltage cap. In the old days (when I first went to television repair school), we used to use screwdrivers. Nowadays you would have a 100 people on KZbin chastizing you.
@patrickjmorgan
@patrickjmorgan Жыл бұрын
I’ve finished repairing a Marantz PM00AV and both modules were blown. I replaced them from a Chinese supplier and it’s been on the bench for a few weeks run up daily with no issues. The gout who sold me the amp was probably aware that he had dropped it. The amp fell on the volume pot, smashing it off its daughter board and breaking the board itself. My feeling is it put full power into both inputs and that’s what blew it. The chips themselves have the circuit for dc sending and dropping a relay, so each models has a speaker protection circuit as it’s a Dolby surround amp. Anyway, I remade the fibreglass board and bridge the tracks where broken and repaired the pot- which is 50k 4 gang with motor- so rare as rocking-horse.
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Cool! You really put some effort into this. I wish I was still like that. 😅
@viantdf4256
@viantdf4256 Жыл бұрын
thats work? I have same trouble.. sharp 9191 gf..
@K-R-I-O
@K-R-I-O Жыл бұрын
Thanks for the explanations ! i rebuilt a GF-8989 which is the same mecanism ! The pinch roller was stuck. With your video : i managed to repair it ! Thanks a lot !
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Glad it helped and you got it fixed. Good job!
@hawk4366
@hawk4366 Жыл бұрын
Awsome man, thanks
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Thanks! Am glad my video helped a little.
@Canoneosmiami
@Canoneosmiami Жыл бұрын
How does it compare to something like gf 777 ?
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
I haven't had the luck of getting a GF-777 since they are so expensive. I would take a GF-777 before I take a GF-9797. The power output of the GF-777 should be higher. And overall a classier and better unit. This is just my personal opinion; no doubt there are some people that probably think otherwise.
@RickRoseIsAwesome
@RickRoseIsAwesome Жыл бұрын
Please do a video where you call HP tech support for something simple on this analyzer.
@jakelencher817
@jakelencher817 Жыл бұрын
I have no idea what this is for but I found it in our shipping container and trying to figure out how to use this thing.
@RoshanTV3
@RoshanTV3 Жыл бұрын
toshiba RT 200S )))
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Old school stuff.
@3dsmaxrocks699
@3dsmaxrocks699 Жыл бұрын
Boy I wish you'd come back on youtube with new videos. Really love your work!
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Thanks, 3dsmax! I actually got three units lined up for videos: 1 amp and 2 boom boxes.
@3dsmaxrocks699
@3dsmaxrocks699 Жыл бұрын
Just bought the Tenma 72-540 which is basically the same exact unit. Brand new in the box with probes but no manual. Anybody have a copy? Not that you really even the manual to use one .....but I'd like it to be a complete set since I have a brand new one.
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Unfortunately, I only have a paper copy of a small manual for the Sansei and it is in the German language. I don't think even that it is an original manual since the pages are stapled, I believe. But as you might have noted, the unit is really easy to use.
@glenstevenson9274
@glenstevenson9274 Жыл бұрын
Best sound
@OldSchoolElectronics
@OldSchoolElectronics Жыл бұрын
Sound is great 👍