Sony TC-458 not changing speed . - Page 4 - UK Vintage Radio Repair and Restoration Discussion Forum

ms660 · 31st Jan 2019, 11:57 am

From post number 8:

Quote:

Originally Posted by NorfolkDaveUK

OK measurements taken in FWD play mode :

7 - 14.5v
8 - 14.7v

I'm now confused.

Lawrence.

NorfolkDaveUK · 31st Jan 2019, 3:08 pm

Different board bud . I`ll take another set of measurements , I`m beginning to think this board is as dud as the one i swapped it with . Bear with me.

NorfolkDaveUK · 31st Jan 2019, 8:20 pm

OK here`s the mess this thing is in - first number what it should be , second number what its reading playing in forward .

1 - 5v -- 0.002v
2 - 0v -- 0.002v
3 - 1v -- 2.026v
4 - 2v -- 1.999v
5 - 8v -- 7.65v
6 - 8.5v -- 8.37v
7 - 15.5v - 11.86v
8 - 15v - 4.76v
9- 0.75v - 1.116v
10 - 1.8v -- 2.186v
11 - 1.8v -- 7.03v
12 - 0v -- 0.000v
13 - 0.2v -- 0.184
14 - 0.2v -- 0.184

The differences from previously are because we thought the IC was borked due to no voltage on 2 pins there for I purchased a new board(obviously used) from the states (from a USA machine !! does this matter

its the same IC) )

Maybe I should try putting the new ic in the old board ...lol (joking)

NorfolkDaveUK · 31st Jan 2019, 9:07 pm

I`m done with this one for a bit , i`m going to put it under the bench and come back to it , I have a teac I need to get ready for sale . I`ll see if I can find another one to compare this one with . I`ll be back to this in due course .

31st Jan 2019, 3:08 pm	#62
NorfolkDaveUK Banned Join Date: May 2018 Location: Norwich, Norfolk, UK. Posts: 605	Re: Sony TC-458 not changing speed . Different board bud . I`ll take another set of measurements , I`m beginning to think this board is as dud as the one i swapped it with . Bear with me.

31st Jan 2019, 8:20 pm	#63
NorfolkDaveUK Banned Join Date: May 2018 Location: Norwich, Norfolk, UK. Posts: 605	Re: Sony TC-458 not changing speed . OK here`s the mess this thing is in - first number what it should be , second number what its reading playing in forward . 1 - 5v -- 0.002v 2 - 0v -- 0.002v 3 - 1v -- 2.026v 4 - 2v -- 1.999v 5 - 8v -- 7.65v 6 - 8.5v -- 8.37v 7 - 15.5v - 11.86v 8 - 15v - 4.76v 9- 0.75v - 1.116v 10 - 1.8v -- 2.186v 11 - 1.8v -- 7.03v 12 - 0v -- 0.000v 13 - 0.2v -- 0.184 14 - 0.2v -- 0.184 The differences from previously are because we thought the IC was borked due to no voltage on 2 pins there for I purchased a new board(obviously used) from the states (from a USA machine !! does this matter its the same IC) ) Maybe I should try putting the new ic in the old board ...lol (joking)

31st Jan 2019, 9:07 pm	#64
NorfolkDaveUK Banned Join Date: May 2018 Location: Norwich, Norfolk, UK. Posts: 605	Re: Sony TC-458 not changing speed . I`m done with this one for a bit , i`m going to put it under the bench and come back to it , I have a teac I need to get ready for sale . I`ll see if I can find another one to compare this one with . I`ll be back to this in due course .