Bush SRP 41 Advice

[popmirrorman]

Thanks Graham, yes I did.

[Analogue man]

Worth a thought though

[John10b]

In post #1 you say the light is still glowing, but now the light is not glowing, which changes things.
If the light was on it would suggest you have mains going into transformer and feeding the light, and possibly the amplifier, with the light out you need to check mains into and out of transformer, as suggested by Graham,. Have you got the circuit diagram?
John

[popmirrorman]

Thanks John. Yes I do have the circuit diagram.

[popmirrorman]

Hi all. If anyone sees this, here's the latest. I tested resistance on the power transformer. Primary reads 128.6. the wires under the capacitor next to it read 0.558. multimeter is in auto range.

It is my understanding that 128 is a high reading. If anyone has any thoughts feel free to wade in.

Cheers.
Ian

[John10b]

The reading should be be in single figures, for that size transformer, perhaps check again making sure you get good contacts with your meter probe.
John

[popmirrorman]

Thanks John. I have taken this to a local electronics guy. Not his usual case but we'll see how it goes. Thanks to all.
Ian.

[John10b]

Ok Ian, let us know how he gets on.
John

[John10b]

Hi Ian, I was checking the service data for your rp, it was a more comprehensive version, and I noted they had the mains transformer primary resistance readings, 187 ohms. The information I gave you previously was incorrect, sorry. The circuit shows the motor connected across the primary so it's possible your reading is correct, and your transformer is ok, let's hope so.
Perhaps you could pass this on to the person looking at your player.

[popmirrorman]

Thanks for letting me know. I will be sure to pass it on.

[paul1962]

The best way of finding your issue, is to start at the mains supply inwards.

First check voltage supply to the switch, then switch on if all is well, and check the supply to the transformer. If all is well, you have eliminated the off on switch that is part of the volume control.

Then check voltage to the rectifier unit. If all good at that point, then check DC output from rectifier to circuit.

If that is ok, then you are looking at a broken wire connection to the amp board.

From the crackling noise you explained, something was arcing and I suspect a connection has failed while moving the unit.

I hope this helps.

[John10b]

Sensible advice from Paul1962
Could it be that when you removed the pcb you accidentally broke the mains connection, obviously it could be the bulb itself.
John

[popmirrorman]

Latest update for anyone interested. The chap here looked at it and told me the motor has failed. If this is the case, are replacement motors available?

Thank you for the advice in the meantime.
Ian.

[paul1962]

Hello again popmirrorman,

I have to say, something seems a little strange with the diagnosis you have been given.
If this is indeed a SRP41, then the motor is fed from the primary side of the transformer.
If this fails (short circuit), it would blow the mains fuse in the plug, and if it goes open circuit, then the amp would still be powered although the platter wouldn't spin. I can't really see how this could happen in transit with the transit screws unscrewed.

The actual circuit (assuming this is the secondary coils of the transformer feed), supplies 26Vdc with a secondary tap of 6.3v to feed the indicator light and both would be impossible to power the deck motor, being a 240Vac motor.

Just my thoughts.

[popmirrorman]

Thanks for your input Paul. Your advice above about starting with the switch seems sensible, and I haven't tried this yet so I will. Should this be done with the unit plugged in?
As for the plug fuse blowing, in this case there is no fuse in the plug. I am using New Zealand plugs.

Thanks.
Ian.

[Edward Huggins]

Originally Posted by popmirrorman

Latest update for anyone interested. The chap here looked at it and told me the motor has failed. If this is the case, are replacement motors available?

Thank you for the advice in the meantime.
Ian.

Does this mean that the motor has failed in that it no longer rotates - or that the winding voltages are not as they should be?

[John10b]

Ian do you have the record player back with you ? If so can you confirm you have mains voltage going into the record player, your post #19 suggests you have no power to he record player.

John

[Station X]

Here's a diagram showing the power supply arrangements for the player. Unless it's gone short-circuit there's no way that a fault with the motor windings can affect the operation of the player's amplifier or pilot light.

[paul1962]

Originally Posted by popmirrorman

Thanks for your input Paul. Your advice above about starting with the switch seems sensible, and I haven't tried this yet so I will. Should this be done with the unit plugged in?
As for the plug fuse blowing, in this case there is no fuse in the plug. I am using New Zealand plugs.

Thanks.
Ian.

Hello Ian,

The tests I mentioned would be with the mains supply connected and plugged in. As a caveat to that, firstly conduct an ohms test from positive to negative of the plug, the reading may only be a few ohms, but a dead short circuit of 0 ohms is a no no.

One would assume that as it is internally fused, any short circuit that would trip the electric should technically blow the fuse, but better to be safe than sorry.

So, with live voltage, input to the off on switch, and work through from there as I detailed previously. Sooner or later, if no power at any point, the fault will be found.

Best of luck and please let us know how you go on.

Kind Regards.

[Station X]

Sorry to be a pedant, but there is no positive and negative where AC mains supplies are concerned. It's LIVE and NEUTRAL.