[TechAssist] Re: Sony KV20S11
- From: "DAMON BRUNGER" <damoneb@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 05 Dec 2005 06:33:33 -0500
So the autoprogram mode just totally misses 27 to 77, the clock pulses take
a dump at that time too.
Can you get any channel in the 27-77 zone by using the keyboard??
If I saw the clock pulses change like that, my FIRST assumption would be the
tuner.
But you've replaced that....
My next assumption would be the Micro, since it generates the clock
pulses....
But the third assumption would be the EEprom, since it tells the Micro to go
thru those channels
So now the key is....do you see 27-77 displayed during autoprogramming? And
the clock "takes a dump" at that time?
I think I'd disconnect the clock from the tuner if it does, and observe
it....see if it gets "pulled down"
If it does while it's disconnected, and it DOES run thru those channel
numbers.....I'd bet the lunch (not the house) on the MICRO.
But if you want to just get it done, replace both.
Now remember, if it jumps immediately from 27 to 78 I'd replace the EEprom.
That would be my plan of action.
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Paul" <dntwntv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, December 04, 2005 7:48 PM
Subject: [TechAssist] Re: Sony KV20S11
>
> Damon
>
> Autoprograms all channels to Ch26 then jumps to 78. It will not tune
any thing above ch26 manually and It will not tune anything above 78 either.
I have 5v-9v-12v&30v. at the tuner. The clock, data & latch enable pulses
are normal except above ch 26 the clock pulses change dramatically.The data
and latch enable pulses are a bit unsteady but they are there with the same
amplitude and shape. The horiz sync is present at pins 1&6. This looks more
like an eeprom to me. What say you ?
>
> Paul
> DAMON BRUNGER <damoneb@xxxxxxxxxxx> wrote:
> I think I might have had a bad EEprom in one of these......
>
> 2 questions.....Can you Direct-dial-in channels above 26 to 78? Yes/No
> If you Autoprogram, does it step thru the 26 to 78 band while it's
> Autoprogramming? Yes/No.
>
> The direct-dial question will indicate the Micro is capable of commanding
> the tuner.
> The Autoprogram question will indicate the software in the Micro is
> correctly working.
>
> Next question, if you Autoprogram and it steps thru 26 to 78, does it lock
> in ANY stations?
> ABOVE 26 Yes/No
> Below 26 Yes/No
> Above 78 Yes/No
>
> You should have a 5V , a 9V, a 12V and a 30 V supply present at the
> tuner......got those?
> Pin3 Ic101 = AFT
>
> Pin41 - clock
> Pin31 - data
> Pin 14 -latch/enable
> These should be present with 5 V data at the Tuner...the latch may only
have
> activity when the tuner gets an active command or possibly only during
> Autoprogram.
>
> The AFT voltage may be a steady-state voltage which only "fine-tunes" the
> tuner, thus the Micro would create it, which means the Micro would need to
> see sync....(pin 1 and 6 of micro has H sync). Check those too.
>
>
> Damon B
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: "Paul"
> To:
> Sent: Friday, December 02, 2005 7:24 PM
> Subject: [TechAssist] Sony KV20S11
>
>
> > Set will not tune past ch-26. After 26, ch- up, goes to 78 then nothing.
> Tuning is controlled by I/C 101 Micro. I/C 102 is eeprom. Question, can a
> defective eeprom cause this symptom. Have replaced tuner.
> >
> > Paul
> >
> >
> > Paul ,B
> > Central TV&Video
> > 911W Grand Ave
> > Grover Beach Ca.
> > (805)481-8084
> >
>
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>
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
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