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Repairs: Repairs

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#293920 - 21/05/2007 20:59 Re: FM dropping out - Original tuner [Re: Magnus]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
The output stage op-amp is failing and needs replacement.
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One of the few remaining Mk1 owners... #00015

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#293921 - 22/05/2007 13:02 Re: FM dropping out - Original tuner [Re: schofiel]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14491
Loc: Canada
Quote:
The output stage op-amp is failing and needs replacement.


In this case, I traced the fault back to the RF module.
So you must be referring to an op-amp inside the RF module, right?

-ml

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#316120 - 08/11/2008 18:40 empeg tuner radio repair rf module replacement [Re: mlord]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14491
Loc: Canada
Just bookmarking this thread with searchable subject, so I can find it more easily in the future!

(doing 2 of these repairs here today).

Cheers

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#316124 - 08/11/2008 20:14 Re: empeg tuner radio repair rf module replacement [Re: mlord]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14491
Loc: Canada
Originally Posted By: mlord
Just bookmarking this thread with searchable subject, so I can find it more easily in the future!

(doing 2 of these repairs here today).

Both tuners now working fine.

Cheers

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#343566 - 20/03/2011 17:16 Re: empeg tuner radio repair rf module replacement [Re: mlord]
MMorrow
journeyman

Registered: 07/01/2002
Posts: 65
Loc: Bellingham, WA USA
My original tuner module failed recently. I was hoping for a loose wire in the harness, but after swapping players, sleds and it with a PCAT tuner, I've come to the realization that it is the tuner module.

It typically works for a minute or two before dropping to a extremely low (unlistenable) volume. Antenna signal strength remains fine even after the sound cuts out. Are these the symptoms of a bad RF module, or could it be the op-amp, or something else? In either case are parts still available for a repair?

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#343568 - 20/03/2011 17:28 Re: empeg tuner radio repair rf module replacement [Re: MMorrow]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14491
Loc: Canada
It's probably that op-amp inside the RF module. The failure mode matches exactly what you describe.

I've never tried isolating it down to the specific component and replacing the component -- which would be the ideal repair. I have replaced RF modules with PCATS versions and some hackery, with a 75% success rate. But I don't do that any more.

Cheers

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#343575 - 20/03/2011 18:14 Re: empeg tuner radio repair rf module replacement [Re: mlord]
MMorrow
journeyman

Registered: 07/01/2002
Posts: 65
Loc: Bellingham, WA USA
Oh, so the op-amp is a sub-component of the RF module. I was hoping it might be a separate and more common part. I'll contact Eutronix to see about the possibility of a repair. Thanks for your help Mark.

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#343610 - 21/03/2011 14:20 Re: empeg tuner radio repair rf module replacement [Re: MMorrow]
maczrool
pooh-bah

Registered: 13/01/2002
Posts: 1649
Loc: Louisiana, USA
Hi Mark (Morrow). I got your message and would be happy to help, but your emails are bouncing and you don't accept private messages here. If you could turn on PMs or provide me an alternate we can take this offline.
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If you want it to break, buy Sony!

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#343634 - 21/03/2011 20:54 Re: empeg tuner radio repair rf module replacement [Re: maczrool]
MMorrow
journeyman

Registered: 07/01/2002
Posts: 65
Loc: Bellingham, WA USA
Hadn't realized my PM receipt was set to off, but it is now on. I'll send you my work email too in case there is some issue with my personal one. I look forward to hearing from you.

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#344484 - 25/04/2011 12:56 Re: empeg tuner radio repair rf module replacement [Re: MMorrow]
matthew_k
pooh-bah

Registered: 12/02/2002
Posts: 2298
Loc: Berkeley, California
My tuner module is having the same symptoms, somehow I missed this thread on the first go around. As a data point, the FM always works, and the AM drops out, usually after an hour of being on.

I've got a spare tuner, and a uncompleted (murdered by me personally) pcats kit. As soon as I open up my dashboard the parts of a working tuner will be up for grabs for the cost of postage.

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#346354 - 11/07/2011 22:07 Re: FM dropping out - Original tuner [Re: mlord]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
It's usually a bad output stage op-amp, the tuner modules are bullet proof.
_________________________
One of the few remaining Mk1 owners... #00015

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