Pioneer TX9800 tuner goes off tune - diyAudio
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Old 2nd August 2012, 06:48 PM   #1
stevieg is offline stevieg  United Kingdom
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Default Pioneer TX9800 tuner goes off tune

I have a battleship Pioneer tuner from thirty years ago that has just recently started to go off tune, and also lets its little birdies sing. Any ideas where to start looking? One of these fellows.

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Cheers Steve
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Old 2nd August 2012, 07:07 PM   #2
Mooly is online now Mooly  United Kingdom
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Where to start... service manual for starters and whatever you do don't twiddle anything internally

Something like that could be difficult to fix. I would check the basics such as making sure the rails are clean and correct. If they vary or drift that will affect the tuning and alignment.

If it is a real RF fault then things get tough. It could be anything... a ceramic cap going leaky, old electroylitics etc etc. Tuner faults are rare.

A can of freezer may help, not blasting parts but just dripping a little onto any suspect items.
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Old 3rd August 2012, 08:11 PM   #3
stevieg is offline stevieg  United Kingdom
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Thanks Mooly. I've removed thirty odd years of dust, and can't see anything that seems to have let the magic electric smoke out, so I will start experimenting with the aerial environment (plant growth) and move slowly inwards. I have a couple of other tuners to check.

Cheers Steve
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Old 4th August 2012, 06:56 PM   #4
kevinkr is offline kevinkr  United States
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Probably about time for a recap, electrolytics only.. And as Mooly has indicated twiddle not yee internal coils, and pots!

Anecdotally speaking my Mitsubishi DA-F10 had started to die, replacing all of the electrolytics (a day's work in itself) brought it back to the expected levels of performance.
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Old 4th August 2012, 07:45 PM   #5
stevieg is offline stevieg  United Kingdom
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Thank you Mr kr. I promise I won't mess with the pots and coils, in an effort to solve the wrong problem. I will take your words on board, especially as I did troubleshoot my Leak Troughline 3 tuner (the conceptual opposite to the Pioneer) by replacing a cap. If all fails I shall console myself that with metal prices the way they are, scrap value of this battleship will probably be more than I paid for it!

Cheers Steve
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Old 4th August 2012, 07:53 PM   #6
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If the tuner is PLL, I would change the varicap diode.
I have no experience of this, only told by others.
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Old 5th August 2012, 07:09 PM   #7
rsavas is offline rsavas  Canada
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With a slide dial I doubt very much it is PLL. I agree start with the Ecaps and then see what happens. I have Pioneer SX950, same vintage, i found the var cap gets noisy with age, so I designed a Si4735 receiver, so no moving parts and RDS +++

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