Sansui SC-3300 cassette deck - help please! - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

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

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
Reply
 
Thread Tools Search this Thread
Old 1st June 2010, 01:32 PM   #1
Vitold is offline Vitold  Canada
diyAudio Member
 
Join Date: Aug 2009
Default Sansui SC-3300 cassette deck - help please!

Hi

Just took the SC-3300 today.
The deck doesnt react on any button push. Capstan rotates when cassette inserted but nothing more
Lumi peak meter indicators work as well as Dolby B indicator. All bulbs light.
Any help guys? SM manual?

Thanks!
Attached Images
File Type: jpg IMG_5469.JPG (504.3 KB, 50 views)
  Reply With Quote
Old 1st June 2010, 02:09 PM   #2
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
there is a chance that your fault lays in the secondary power supply look there
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 1st June 2010, 05:55 PM   #3
Vitold is offline Vitold  Canada
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by sakis View Post
there is a chance that your fault lays in the secondary power supply look there
Sakis, I think you are right.
The belt is ok and capstan rotates as it should be.
Looks like there is no voltage at all 3 solenoids and a reel motor.
There is a DC of 0.75V at control buttons.

On the right side white bus the yellow and green wires are for reel motor (no voltage) and black and red are for capstan motor (13.5 V DC always)
On the left lower corner is a bus for solenoids supply. No voltage!

What I afraid is faulty logic IC. Which open/close power to supply reel motor and solenoids when necessary.

Any suggestions?

... and anybody - SM please!
Attached Images
File Type: jpg IMG_5476s.JPG (479.0 KB, 40 views)
  Reply With Quote
Old 1st June 2010, 06:17 PM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Could the reel motor be faulty/seized and have blown a safety resistor etc.

IC's are very reliable, it's things that handle power that give trouble.
Worked on a lot of stuff over the years (it was the day job ) and for some reason a common failure with Japanese transistors is them failing open circuit B-E, which is easily checked by measuring the voltage across it (cannot exceed 0.7 volts).

You need to trace one of the solenoids and the reel motor and see what drives them, and where that device then gets its power.
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 3rd June 2010, 03:44 PM   #5
Vitold is offline Vitold  Canada
diyAudio Member
 
Join Date: Aug 2009
Thanks to everybody! The problem was dead cold soldering somewhere on power supply/logic PB
I have tested all transistors as Mooly suggested and bent the board a bit. And a deck logic has back to life!

The 31 yrs old guy is still alive and plays very well!
Picasa Web Albums - Clifford - Sansui SC-3300

Anyway, SM anybody? Want to calibrate it
  Reply With Quote
Old 3rd June 2010, 04:45 PM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
That's good... so why not give it a full resolder. Hitachi TV's were terrible for that, some component legs were oxidised and you could never get the solder to take... it was a common fault. Definitely worth a shot.
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY cassette deck Vivek Analogue Source 50 21st July 2014 04:40 PM
Sansui SC-5330 cassette deck GregFox Analogue Source 0 12th April 2009 08:48 AM
teac a-400 cassette deck pezza89 Swap Meet 0 6th November 2007 02:14 AM
Fs: AKAI Cassette Deck TheNoodPoopler Swap Meet 1 28th May 2004 07:06 PM
Pioneer Cassette Deck TheNoodPoopler Swap Meet 2 28th May 2004 07:05 PM


New To Site? Need Help?

All times are GMT. The time now is 01:07 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2