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Technics 1200 mk2 Turntable Erratic Pitch
Technics 1200 mk2 Turntable Erratic Pitch
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Old 30th November 2017, 11:28 PM   #1
Bean333 is offline Bean333
diyAudio Member
 
Join Date: Nov 2017
Default Technics 1200 mk2 Turntable Erratic Pitch

Hi All....I'm new here, sorry if I posted in the wrong place.

One of my Technics (1200 MK2) is having an erratic pitch issue. This happens after the deck is warmed up. On zero, the table spins fine, as soon as I slide the pitch up or down, the dots go wacky and pitch is all over the place. So far I have done the following:
-changed pitch control with PCB
-changed diode 301 on main board
-changed ic301 (AN6682).
-calibrated pitch

I have read other threads on here addressing this issue, but, nothing I've seen here or researched online has helped me with this yet.

Any other suggestions would be appreciated. Cheers!
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Old 1st December 2017, 12:50 AM   #2
Tajzmaj is offline Tajzmaj  Slovenia
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Join Date: Mar 2011
Location: Ljubljana
Check power supply. I think you need 20V at it's output(from my memory). You might have defective pass transistor( or some other ones). Check electrolytic capacitors especially if your unit is well used and old. Service manual is available online.

cheers
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Old 1st December 2017, 01:03 AM   #3
Bean333 is offline Bean333
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Join Date: Nov 2017
Thank you, I will check it out.
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Old 4th December 2017, 07:06 PM   #4
Lordlidder is offline Lordlidder  England
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Join Date: Nov 2017
Location: Devon
Quote:
Originally Posted by Bean333 View Post
Hi All....I'm new here, sorry if I posted in the wrong place.

One of my Technics (1200 MK2) is having an erratic pitch issue. This happens after the deck is warmed up. On zero, the table spins fine, as soon as I slide the pitch up or down, the dots go wacky and pitch is all over the place. So far I have done the following:
-changed pitch control with PCB
-changed diode 301 on main board
-changed ic301 (AN6682).
-calibrated pitch

I have read other threads on here addressing this issue, but, nothing I've seen here or researched online has helped me with this yet.

Any other suggestions would be appreciated. Cheers!
Hello I've found most problems with technics turntables can be diagnosed via YouTube.... Viper frank I seem to recall. Best of luck chap
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