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|21st December 2008, 12:27 AM||#1|
Join Date: Dec 2008
SL1210 MK2 Intermittent pitch problem
I hope im posting in the right place,Im new to this forum so please go easy on me...
I have a problem with one of my 1210's.
The turntable has been sitting for about a year or two due to the fact that it would turn on at all so after some investigation, I found that the wire for the target light was very close to snapping inside the pop up unit so i just removed it all together thinking if its not there than it will be fine and it was for a few weeks then this started.......
When i turn it on and press the start button, it starts as it should but then the pitch speeds up intermittently then back..all within say 5 seconds and then starts again,the red dots by the on/off switch are all over the place and the pitch increase/decrease is very noticeable over the sound system i have.
the pitch fader is in good condition and i have checked for any other shorts but cant find anything..
Im fairly able with a soldering iron and multimeter but even so im still abit stuck for info on how to sort this problem.
Any info will be greatly appreciated.
|21st December 2008, 12:47 AM||#2|
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
well- I'll try to guess - usually when power wire for target light snaps, touching case - main regulator transistor is in danger ;
probably that transistor in your TT is damaged from that reason , and he's acting funny
Q1 is 2SD1265 - under the clamp on metal part of case , and Q2 and Q3 are little ones on pcb - you'll find them looking at overlay on pcb .
both are 2SD637
check also D1 , which is 5V1 zenner diode .
in case that you are not able to check that by your self , find a tech .
you must see 21V6 after Q1 emiter
do not power up TT without platter ;
OK - you can power up it without platter , but be careful to not press start without it
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