Systemdek IV E Fault 33RPM

roman around
kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Systemdek IV E Fault 33RPM

Post by kdt6452 » 09 Jun 2019 21:10

Just got my turntable out from hibernation after many years. It spins and plays when I select 45rpm but not when
I select 33rpm. I fitted a new belt before I started playing it and both speeds worked for a few hours bit the 33 now doesn't but the 45 still does. Would be grateful if anyone knows what could be wrong?

Alec124c41
vinyl engineer
vinyl engineer
Canada
Posts: 23042
Joined: 28 Oct 2002 03:24
Location: North of Toronto, Canada

Re: Systemdek IV E Fault 33RPM

Post by Alec124c41 » 09 Jun 2019 21:26

Fresh oil to the platter spindle bearing is indicated. A drop to the motor bearings while you are at it.

Cheers,
Alec

kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Re: Systemdek IV E Fault 33RPM

Post by kdt6452 » 09 Jun 2019 21:59

Thanks for quick response Alec,

I should have mentioned that the motor doesn't spin on 33 but it does on 45.

Alec124c41
vinyl engineer
vinyl engineer
Canada
Posts: 23042
Joined: 28 Oct 2002 03:24
Location: North of Toronto, Canada

Re: Systemdek IV E Fault 33RPM

Post by Alec124c41 » 10 Jun 2019 00:06

You have electronic power and electronic switching of speeds. There is apparently a fault in the electronics. It might be as simple as a dirty switch or blown fuse, or a failed capacitor, or not.
I am out of my depth on this one.

Cheers,
Alec

kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Re: Systemdek IV E Fault 33RPM

Post by kdt6452 » 12 Jun 2019 18:27

Thanks for your thoughts Alec,

Have dropped the turntable into a local electronics specialist to get checked.

Many thanks

markcass
long player
long player
Great Britain
Posts: 1308
Joined: 26 Oct 2002 23:16
Location: Surrey

Re: Systemdek IV E Fault 33RPM

Post by markcass » 12 Jun 2019 18:48

Hi

Those Systemdek electronic power supplies didn't have the best reputation for reliability IIRC. If yours can't be repaired, there are external power supplies, such as the Heed Orbit, that would work with some alterations to the motor wiring. It might also be possible to fit the Hercules power supply (a replacement for the Linn Valhalla) inside the plinth.

The deck is certainly worth it.

HTH

Mark

abril
long player
long player
Georgia
Posts: 2532
Joined: 13 Oct 2002 20:48
Location: Republic of Georgia/Cornwall

Re: Systemdek IV E Fault 33RPM

Post by abril » 12 Jun 2019 20:32

Even temporarily making up a passive supply.

kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Re: Systemdek IV E Fault 33RPM

Post by kdt6452 » 14 Jun 2019 14:17

Thanks to all the responses. I'll hopefully know next week what's wrong with the deck.

cheers
Ken

kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Re: Systemdek IV E Fault 33RPM

Post by kdt6452 » 29 Jun 2019 14:13

Just been told it's the motor that's at fault, so would appreciate some advice on these options.

1. Mothball the Systemdek and purchase a new Rega PL1

2. Have a new motor fitted to the Systemdek

3. Purchase an Origin Live Turntable Motor and Power Supply.

All are roughly the same price so was wondering what you guys thought would be the best option.

Thanks
Ken

Alec124c41
vinyl engineer
vinyl engineer
Canada
Posts: 23042
Joined: 28 Oct 2002 03:24
Location: North of Toronto, Canada

Re: Systemdek IV E Fault 33RPM

Post by Alec124c41 » 29 Jun 2019 19:50

Motor. Definitely. Your choice.

Cheers,
Alec

markcass
long player
long player
Great Britain
Posts: 1308
Joined: 26 Oct 2002 23:16
Location: Surrey

Re: Systemdek IV E Fault 33RPM

Post by markcass » 30 Jun 2019 00:03

Agreed, definitely go for a new motor. It’s actually a fairly standard AC synchronous motor for turntables, used in many other makes over the years.

kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Re: Systemdek IV E Fault 33RPM

Post by kdt6452 » 30 Jun 2019 13:19

Thanks for your views. What I don't understand and worried about is how a motor can work at 45 but not 33 if
that's the only thing that's wrong.

Cheers
Ken

markcass
long player
long player
Great Britain
Posts: 1308
Joined: 26 Oct 2002 23:16
Location: Surrey

Re: Systemdek IV E Fault 33RPM

Post by markcass » 30 Jun 2019 18:49

kdt6452 wrote:
30 Jun 2019 13:19
Thanks for your views. What I don't understand and worried about is how a motor can work at 45 but not 33 if
that's the only thing that's wrong.

Cheers
Ken
Yes, that doesn't make any sense. My money's still on a power-supply fault. To take a (slightly) related example, I used to have a 'Flutterbuster' power supply, which is built on the same principles as the Systemdek supply, I believe. I used it with a Systemdek II (the round one), though that's just coincidence as it was a 'universal' supply.

After the Flutterbuster had been stored for a few years, I took it out to try it on another deck and found that only one speed actually worked (i.e. supplied power to the motor) - I can't remember whether it was 33 or 45, sorry. I suspected a component had failed on the board. Maybe the same has happened with your Systemdek supply?

HTH

Mark

kdt6452
junior member
junior member
Great Britain
Posts: 14
Joined: 09 Jun 2019 15:12

Re: Systemdek IV E Fault 33RPM

Post by kdt6452 » 01 Jul 2019 01:14

Hi Mark,

Thanks for your response. I too think there's something wrong with the power supply even although I've been told it's ok and it needs a new motor. I've attached a picture of the PSU which I think shows a burnt out capacitor (the blue .047k 250) just below the switch cable and to the left of the LAK Capacitor.

I'd appreciate it if you could take a look at the pic and let me know your thoughts.

45890

markcass
long player
long player
Great Britain
Posts: 1308
Joined: 26 Oct 2002 23:16
Location: Surrey

Re: Systemdek IV E Fault 33RPM

Post by markcass » 01 Jul 2019 18:45

Hi Ken

I'm no expert on the electronics side of these decks - there are certainly others on this board with more knowledge than me. However, that .047k cap certainly doesn't look healthy. I'm pleased to see that the company at least fitted 105ºC-rated electrolytic ones, though I really hope that's also true of the 'LAK' axial electrolytic*, as it's achingly close to one of the heatsinks! Later versions of the Systemdek electronic decks had an outboard version of the supply, which I gather was (a bit) more reliable - one of the founder's sons later admitted that this wasn't the best-engineered aspect of their decks. * Surely the designer could have laid the board out so the other components didn't wedge it against the heatsink!

My Flutterbuster's circuit board was much larger, though probably a touch agricultural in design. It had two pairs of transistors on heatsinks, however. The unit was designed so the deck's mains lead plugged straight into it, thus the board had to output 200 volts or so for UK/European decks to run! Newer plug-in supplies generally use a transformer on the output to raise the voltage, I believe.

HTH anyway

Mark

Post Reply