Akai GX-635D Repair - Won't Do Tape Recording 

Thanks for this video... i repaired my AKAI GX-635D it recorder only one left channel. Now it's records on Left and Right ch with great sound ....... I also recorder trimmer VU meter... Thanks again to you !!!!!

Excellent troubleshooting!

Thank you very much sir for this video...tonight i repaired my great AKAI GX-635D and it sound great and he records like new one..Thank's to you !!!!!

Thank you! I have a logical direction to start now. God bless

excellent video, thank you !

Bravo and tnx for subtitle.

Great video,much appreciated 👏👏👏

WOW! It works.

Thanks for sharing your knowledge. It’s a great clip for repairing. I have the same problem with left channel won’t record. I don’t have a schematic. Can you ping point the location of tr3 and tr4 on the preamp board? Thanks in advance.

Thank you.

Hi ! I'm not technician but found 20 transistors 2SC458 Hitachi (knew as problematics) in my unit. Unit do not recording both way. My question is if I do replace these 20 transistors 2SC458 , will my unit recording both way again ?

great vid i just started using my 635d ,,,plays fine but went to record both chan have no meter working an i made a check to see if i am hooked up right on my sta 2000 rec an i am,,, bet it has bad 458 trans on both sides i did fix the right playback side with new tran in 2007 ,,looks like i should replace all ,,,

Could you please tell me where did you buy that transistor ? Thank you so much

Do the VU meters have to move equally at all times when the music is playing? Or does the meters move according to the sound level of the music in each channel? Does anyone know? Thank you

Hello Sir! I have the same deck, maybe you can lead me the way… rewind is very very slow and sometimes it stops? And second.. the vu-lights are not bright but very low? Greetings Tony (holland europe)

I just bought this tape recorder for cheap because broken. No fast forward, No rewind, No play in either direction, capstan does not move up to push tape to head, no green led above play buttons. Amplifier and heads work because if I rotate reels manually I hear recording on the tape. The main motor in the center is spinning when turned on. Where to start? Any advice?

Have a GX-635D recently but it does not play, it powers up, but no green light comes on, nor any function works like rewind or record. Not sure what that would be. There is tape mounted on it. But no movement of the capstan or motor sound

Hello. I recently bought a broken Akai 635d. The left channel in the reverse did not work, I replaced all the transistor 458 and everything is ok with playback. The problem is with the recording, when I want to record the signal appears on the input, both indicators work, but pressing the tape there is silence. The previous recording is replaced with silence. So the recording mode works. Where could be the problem. Where in the diagram is the rec mute system, maybe it causes the problem. Please help.

I had similar problem recently in playback the right side disappeared and find that the problem is with the t7 2SC458 transistor wich hfe dropped to 34! Otherwise in diode mode the tests was ok but the DC parameters differed. After some research I found an article with the titel Defective Hitachi Brand Transistors on reeltoreeltech wich is about the corrosion problem of 2SC458 transistors: 'The theory is that the wire leads of the Hitachi transistor get corroded over time, and that corrosion slowly creeps into the To-92 package, where it corrodes the silicone substrate of the transistor. This can lead to intermittent audio, distorted audio, or high background noise levels. On occasion, an audio channel can go completely dead, but left off overnight, the channel can start working again the next day. Even more annoying, if you pull the transistors out of the tape deck, they test just fine in a transistor tester. If you put a voltmeter on the transistor, then the readings are a mile off from what they should be, so our theory is that the transistor junction breaks down when an operating voltage is applied to it, but under the lower voltage of a transistor tester, they check OK.'

This video should name: Akai 635D NO LEFT CHANNEL Output from RCA IN...because with this faul, if you tried to listen to music from RCA input, left channel will be missing, not even when you tried to record anything... No Recording problem is a total different fault on this machine.