audio-talk

Tom petty full moon fever, just had jimi hendrix - hendrix in the West. Both on vinyl borrowed of the missus' dad.
The hendrix is a brilliant record, I shall have to buy it

Edit: in the West is being re released on 17th October as a double lp, i'll hang fire and buy a new copy when it drops

Nope dave, wasnt misleading, it looks like some models of the motor were prone to faliure exactly as you described. Failure of the ic on the control board attached to the motor underneath the plastic cover appears to have been the culprit from what I can gather. And it looks like its a pig to get it...

Ta for the current draw info neal, the sticker on the motor is that faded now that none of the relevant info is readable any more...... Its probably that my mains voltage is abit high which has pushed the figures up. Putting the meter on ac shows a varying figure between 0 and 0.3v so there's some r...

Ive done a little measuring of the power supply this morning. With no load the psu outputs 20.1v irrespective of what position the adjust pots are in, and wether 33 or 45 is selected. As you would expect. Measuring under load with the deck turning its putting 19.6v out at the connetor for the motor....

Found the correct motor type, its a matsushita mkl 15b3. I see no reason why another mkl series motor wouldnt be a drop in replacement as they seem to be 18v, and have the same physical dimensions, and the first iteration of the jbe which were the environmental sound branded ones appear to have had ...

Yep, the disc and sensor on your kd provide the feedback to the ic on the board attached to the base of the motor, wheras mine has more poles but no feedback loop I can see unless ive missed something somewhere that gives a reference back to the ic. I think it is 18v, the tx is 20v, but i assume the...

Blue train - John Coltrane. On the jvc, now with the at150sa on it but in the jelco headshell instead of the jvc one. the robot arm seems to like the jelco headshell better

Its a matsushita mkl series motor, the one in this link without the perforated disc bolted to the rotor http://liquidaudio.com.au/kenwood-kd-500550-turntable-motor-service/ I wonder if kenwood changed the motor at some point in production, my motor is dated November 79. The label has abit missing, i...

Thank gawd for that. Eyes on stalks now

i could fetch the f5 and passive, and maybe the jvc direct drive?

yes d1 is a zener and yes you were right about the connections on the transistor. I took the bloody thing off the board and the pins were marked up on the underside, nothing on the can anywhere other than the part number......... have i finally got it ? i think the bridge is now a bridge. thanks nic...

intj, parts of entj too

ive had another look at it from scratch.
hopefully this is more like it, id missed a wire link amongst other thingsErrrr by anthony cresswell, on Flickr
not sure about c2 still though, the board is tiny and my eyes are shit....

this make more sense?
Edit by anthony cresswell, on Flickr
think theres still something wrong, theres no little tab on the transistor so i cant tell which way around it is

Have I drawn the transistor upside down? I thought the diode was there for stopping back emf
Edit: I think ive drawn half the right way up and half upside down