All,
I bought this turntable for $150, with the knowledge that it did not "turn on". It's a $2k turntable new and after research, I found the replacement parts for about $250. So, all in, I figure I'd have a roughly $2k turntable for about $400, after repair (so I thought!)
Anyway, I have now replaced all electronic parts of this turntable (Power PCB, Speed Control PCB, Motor, and new power supply 15V DC). After connecting all the new parts together, outside of the turn table casing, it still does not power on. Regardless of the turntable, these parts should at least power on, right? I am posting pics of the new parts connected and the 15v DC power supply and picture of the back of the turntable asking for DC power. Any thoughts of what else I could try with this thing?
I bought this turntable for $150, with the knowledge that it did not "turn on". It's a $2k turntable new and after research, I found the replacement parts for about $250. So, all in, I figure I'd have a roughly $2k turntable for about $400, after repair (so I thought!)
Anyway, I have now replaced all electronic parts of this turntable (Power PCB, Speed Control PCB, Motor, and new power supply 15V DC). After connecting all the new parts together, outside of the turn table casing, it still does not power on. Regardless of the turntable, these parts should at least power on, right? I am posting pics of the new parts connected and the 15v DC power supply and picture of the back of the turntable asking for DC power. Any thoughts of what else I could try with this thing?
Do you have any service information and circuit diagrams for this because without those its going to be difficult. All you can do is check the supply voltage is reaching all the boards and circuitry. There seems to be something that looks like a crystal on one of the boards, presumable divided down to generate the AC motor drive voltages. Scope checks on that chip (look up the data sheet) would also be an initial check.
If you have swapped 'everything' then maybe there is something simple like a missing 'on' or 'run' logic level somewhere that relies on some external input.
If you have swapped 'everything' then maybe there is something simple like a missing 'on' or 'run' logic level somewhere that relies on some external input.
Thanks, Mooly. Unfortunately, Pro-Ject seems to keep any diagrams close to the vest. The crystals are two LED's that light up to indicate 33 or 45, depending on how long you press the button.
Fair enough... I was looking at this for possibly being a crystal:
I would have thought the LED's would light of power was correctly applied and any switch/s are set correctly.
I would have thought the LED's would light of power was correctly applied and any switch/s are set correctly.
Just to be sure, have you measured the output voltage of the switching power supply?
Before replacing parts at random, you have to diagnose the problem.
Before replacing parts at random, you have to diagnose the problem.
Can the five pin connector on the power PCB be connected the other way around? It looks to be connected upside down (usually not possible, but just a thought).
Dan
Dan