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Old 18th February 2016, 02:22 PM   #1
adason is offline adason  United States
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Default sanyo plus t35 tuner

hi gents, yes I searched...
can anyone help with schematics or even better, with service manual for sanyo plus t35 tuner?

I recently obtained both, preamp c55 and tuner t35 from flea bay, and I am working on restoration

Preamp did not need much, just cleaning the switches and pots with deoxit, it works great and sounds good even before recaping. It has four bipolar caps in signal, which I am going to replace eventually. But I could not wait, I needed to test it, you know how it goes...

When it comes to the tuner, it works, but its little more complicated as preamp. Signal meter needs adjustment, as it shows relatively full signal on the indicator, even station is far and signal is small, which is not convenient for antena positioning. Then it needs a little adjustment, as the "lock" function turns in when tuning indicator is not fully in the center, and so on. Otherwise it sounds good on strong stations. I would like to have schematics, as to identify which pot and which coil is for what. I do not want to just jump in and start touching the stuff. Plus I would like to see audio section after stereo decoder, as what caps potentially should be replaced.
Schematics would be helpful, service manual even better.
Thanks, ed
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Old 18th February 2016, 02:42 PM   #2
Mooly is offline Mooly  United Kingdom
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I'm afraid I can't help with the manual, but just a thought on the signal strength meter... it was pretty common generally for these to show full strength, and for the simple reason that it always looked better on the shop shelf to prospective customers that way.

If you need to identify coil functions then it can sometimes be worth just threatening them with a ferrous trimmer... no need to alter anything... just put it into the dust core and observe the effect as the trimmer tunes/detunes the coils.

If it uses a recognised chip set (rather than all discrete) then any application notes should show virtually a standard implementation and what any coils and presets do.
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Old 18th February 2016, 10:48 PM   #3
adason is offline adason  United States
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hi Mooly, thanks for reply, yes, that's the way its going to be, most likely. But it is going to be quite easy. Looking inside, these are the chips I see: A1231N (if section), HA1196 (stereo demodulator), LB1416 (signal level meter), TC4011BP, LA1240, and output dual opa rc4558.
Last chips are likely AM section, which I do not care about...
The reason I think the adjustement is going to be easy, because each pot is labeled what it is for!
Right next to A1231N I see 3 ceramic filters, two big poted coils for demodulation, and most importantly IF gain pot, Mute 1 pot, Mute 2 pot, and FM signal pot.
Right next to HA1196 I see 76kHz adjust, and two pots sep. wide and sep. narrow...

So over the weekend I will spend more time with it. I see its going to be fun.
It is well built 4 gang analog tuner, with analog scale plus digital readout, which slides under analog scale, as you tune in. Quite a nice looking tuner.
Offcourse there is board for digital display and so on...I do not care about that.

I can take some pictures, if forum is interested.
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Old 18th February 2016, 10:53 PM   #4
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Nice pickup on that pair...

I have a T55 tuner from the plus series that I often use to test out gear (it has variable output level). The T35 is supposed to be a good sounding tuner and the preamp is also supposedly pretty good, although I haven't owned either one.

If you look around on the web you should be able to find copies of the service manuals for both.
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Old 19th February 2016, 02:31 AM   #5
adason is offline adason  United States
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t35 has variable output as well
I found service manual for preamp on hifiengine
No luck with tuner though
I may not need it after all
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Old 19th February 2016, 03:15 AM   #6
anatech is offline anatech  Canada
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Hi Ed,
Without the proper equipment, you shouldn't touch the tuner. If it works, let it be, or have it aligned properly.

As for the improvements, start with the detector output capacitor(s), then look at the audio capacitors. With a 'scope these will be easy to find. Of course, this wouldn't be a complete "recap" (I hate that term). Same holds true of the preamplifier and especially the amplifiers. You are best not to touch an amplifier. There are some nasty surprises lurking in there, and if you do not have an oscilloscope - don't mess around in there. The amp can run and still have a problem. Some times a big problem.

I get a lot of "just recapped" equipment for repair. They are sort of TIM problems.

Technician Induced Malfunction

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Old 19th February 2016, 03:31 AM   #7
adason is offline adason  United States
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good advice anatech, i will keep that in mind
I see four electrolytic capacitors what seems like in and out of dual output opa
those would be the only one to replace

Otherwise the pot labeled "fm signal" is precisely what i was looking for, it does not change alignment, only sets the sensitivity of signal meter
i already lowered to the level, where the strongest stations are full signal, all others show less then full
as it was before all stations were in full signal no mater how weak or noisy

I will not touch any critical alignment, i just need to make sure when it does "quartz lock" it is precisely tuned...that needs to be figured out.
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Old 19th February 2016, 03:51 AM   #8
anatech is offline anatech  Canada
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Hi Ed,
That sounds very reasonable. Now the signal strength meter is useful for a change.

I hate seeing equipment heading for scrap. Good show rescuing these!

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Old 19th February 2016, 08:26 AM   #9
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by adason View Post
The reason I think the adjustement is going to be easy, because each pot is labeled what it is for!
Marked pots are always a bonus The 4558 would certainly be something to look at changing... I'm assuming its the audio line output amp and not used for PSU or other duties. Perhaps something like an NE5532 or LM4562.
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Old 19th February 2016, 02:54 PM   #10
adason is offline adason  United States
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I have not decided, but if I will feel like it, besides those four caps, I may install the socket for the output dual opa chip, that way I can swap to any, but I do not see it completely necessary, as of now the tuner sounds quite decent.
As I have Sony ST-S555ES (I have 3 of these!) as my reference, and Sanyo Plus t35 will never reach the level of Sony no matter what I replace or tune, I may just leave the 4558 in.
Sanyo sounds great on strong signals, and mono on weak signals, but does not come close to the Sony when it comes to the weak long distance stations. And that is a fact.

Now when it comes to the signal meter, Sanyo t35 has only 5 led signal strenght indicator, which, even now working fine, is far cry for good signal meter. Sony has way better signal meter, something like 30 bar signal meter (I am not at home now, its just what I recall). Similar to some Yamaha models, remember those signal meters?

But, but, when it comes to the signal strenght meter, nothing compares to better JVC tuners. I have one, X300?, do not recall now exactly, they do measure signal in digital readout in dB from 0 to 100 dB in one dB scale. Amazing. Now when it comes to signal quality, and sensitivity, JVC does not even come close to Sony, that's for sure, but I keep it just for the signal level meter. And one other feature, two separately powered AC switches, which can be programmed. Quite a useful feature...now back to work.

Last edited by adason; 19th February 2016 at 03:00 PM.
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