Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Need help fixing a tape deck, if possible.
Need help fixing a tape deck, if possible.
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 23rd April 2012, 02:58 PM   #1
Navyblue is offline Navyblue  Singapore
diyAudio Member
Join Date: Mar 2012
Default Need help fixing a tape deck, if possible.

I just bought an old tape deck for fun. It's a Technics RS-TR373. It has electronically controlled head and door movement, but no newer features like skipping to the next song, and it says "made in Japan", so I am guessing it is probably from the late 80s or early 90s.

I cleaned up the head and the roller as best I can with IPA. I think the heads are squeaky clean now as far as I can tell, and it looks very shiny. But still there are a few problems with it.

1. The left deck sounds more muffled than the right one. At times it plays good for the first few seconds and then turn muffled. At times I can also hear both channels' sound modulating in loudness and treble response. The modulation is not in unison on both channels. Does this sound like capacitors needing replacement? Or is it something more dire and there is nothing much to do? I understand that there is no way that you would know what is going on for sure, but an educated guess or point me in the right direction are welcome here.

2. As I said, the right deck sounded better, but it has another sets of problem. That is it can't play in the reverse direction. When I do that it would output some soft static and then reverse or stop itself. This is probably something more complicated that I can't fix, but if you have any insight I'd be happy to hear. I've also notice at times the left channel turning very soft and muffled.

I downloaded the schematic online, but of course it doesn't mean a thing to me.

Last edited by Navyblue; 23rd April 2012 at 03:00 PM.
  Reply With Quote
Old 23rd April 2012, 03:02 PM   #2
KatieandDad is offline KatieandDad  United Kingdom
diyAudio Member
KatieandDad's Avatar
Join Date: Nov 2011
Location: UK
Try de-magnetising the heads.

Muffled sound is usually down to either:

1. Faulty components.
2. Magnetised heads.
3. Poor tape path.
  Reply With Quote
Old 23rd April 2012, 03:36 PM   #3
aptquark is offline aptquark  United States
diyAudio Member
aptquark's Avatar
Join Date: Jun 2010
Location: MS
get a screrw driver and realign the head on the left deck. Use your ears, get a really good tape. Auto reverse decks are a pain in the azz, always issues with alignments. At this point, you have nothing to lose.
  Reply With Quote
Old 23rd April 2012, 03:46 PM   #4
Phat Daddy Mark is offline Phat Daddy Mark  United States
diyAudio Member
Join Date: Aug 2007
Hi Navyblue,

This may not be so bad. I have a lot of experience with older Technics decks from the 70's and 80's. With any luck the low muffled sound and low volume is a dirty record/play switch.

Take off the cover and look for something about 8 to 10 mm wide and 50 to 80 mm long. Use some good contact cleaner and cycle the switch for a minute or two.

The reverse direction problem is usually related to insufficient take-up torque in the reverse direction or the sensor for the reverse direction. Sometimes you can clean the clutch and it will fix it. The sensor is a little more difficult to find without test equipment.

Hope this helps.
I have proof that God exists; he divinely inspired the invention of spell check just for me.
  Reply With Quote
Old 23rd April 2012, 04:21 PM   #5
Navyblue is offline Navyblue  Singapore
diyAudio Member
Join Date: Mar 2012
Thanks guys, those certainly helps.


I don't know if the head is magnetised in the first place, but in my reckless attempt to demagnetise it, I think I have magnetised it because it now sounded a lot more muffled than it was. So other potential problem aside, now I need a real demagnetising solution.

I see there are a few cheapish demagnetiser, most are from the US, which I assume they are for 110V mains, would they by any chance work for 230V mains? Since I assume they are just solenoids.

Or, can I just coil either the live or the neutral of a lamp cord on a screw driver or wrench and move it to the head slowly? I think there is a chance that it would work since coiling BOTH the live and neutral actually works on magnetising the head.


I'll get to that after I fixed the mess I just made.


You sounded like you will be my saviour. I 'll get to that after demagnetising the head.
  Reply With Quote


Need help fixing a tape deck, if possible.Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tape Deck Motors tmblack Analogue Source 3 12th October 2011 06:36 AM
fixing a tape deck stephen Bishop Parts 12 9th November 2006 01:33 PM
Can I save my tape deck? Brion55 Analogue Source 4 29th July 2005 06:36 AM
GC for tape deck use? dine1967 Chip Amps 2 11th May 2004 01:42 PM
Tape-Deck for sale! Cobra2 Swap Meet 1 15th March 2004 10:43 PM

New To Site? Need Help?

All times are GMT. The time now is 12:20 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio