Marantz JJ221 turntable

pirx1949 · 12th April 2011, 10:47 AM

I just got a direct drive JJ221 turntable and it works but there is a high frequency flutter present at all speeds. I checked the motor control circuit, all the transistors are ok, DC voltages are ok but the voltages to the motor coils are very much distorded, I expected more or less sines.
Any advice? Should i replace the IC (PC1043C)?
Pirx

kevinkr · 13th April 2011, 01:28 AM

Quote:

Originally Posted by pirx1949

I just got a direct drive JJ221 turntable and it works but there is a high frequency flutter present at all speeds. I checked the motor control circuit, all the transistors are ok, DC voltages are ok but the voltages to the motor coils are very much distorded, I expected more or less sines.
Any advice? Should i replace the IC (PC1043C)?
Pirx

Try recapping first.. And I bet that chip is near unobtainium..

pirx1949 · 19th April 2011, 08:43 PM

The chip is available from several sources but quite expensive...
I will try the caps.
Pirx

12th April 2011, 10:47 AM	#1
pirx1949 diyAudio Member Join Date: Apr 2011	Marantz JJ221 turntable I just got a direct drive JJ221 turntable and it works but there is a high frequency flutter present at all speeds. I checked the motor control circuit, all the transistors are ok, DC voltages are ok but the voltages to the motor coils are very much distorded, I expected more or less sines. Any advice? Should i replace the IC (PC1043C)? Pirx

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19th April 2011, 08:43 PM	#3
pirx1949 diyAudio Member Join Date: Apr 2011	The chip is available from several sources but quite expensive... I will try the caps. Pirx

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