G'day Andre,
yes the poly midi out works fine, controlling a voce electric piano.
i previously determined there was clock and signal gettting to the tone
generator, but no sound out on its output ports,
so i figured that was the defective port.
best regards,
Marcus
On Thursday, July 22, 2004, at 02:25 AM, Andre Schaap wrote:
> As i said ic34 is responsible for scanning the keyboard, so if this ic
> is defective, you won't hear a sound. So far the manual is right.
> However, since Marcus said midi out is ok, i presume that the keyboard
> is working, otherwise you'd have no midi output, except for the
> sequencer.
> Maybe Marcus can reply to confirm this.
>
> English is not my first language , so i hope you understand.
> Please send me page 6 and if possible the complete manual.
>
> Regards
>
> Andre
>
> x x wrote:
>> Then why does it say on page six that if no sound is heard at all that
>> this is the cause?
>> I can email the page to you Andre...
>> Inm just wondering.
>>
>> ∗/André_Schaap <andre@...>/∗ wrote:
>>
>> hi,
>>
>> If you don't have schematics you can find it here:
>> http://www.oldcrows.net/~patchell/poly800/poly800.html
>>
>> ic 34 is responsible for scanning of the keyboard matrix.
>> So, if you say midi out is ok then this ic is not defective.
>> If ic34 is defective, you still should have sound when using midi
>> in.
>>
>> If you have an oscilloscope you can check pins 28 to 36 of ic 3
>> for
>> tone
>> output.
>>
>> This is the sound generator ic.
>>
>> Please check and report.
>>
>> BTW, TC40H138 is a very common ic.
>> If you can't find the toshiba version, there are plenty of other
>> manufacturers that produce this ic.
>>
>> Regards,
>>
>> Andre
>>
>> Marcus Wilson wrote:
>>> CHEERS!$!@$
>>>
>>> will take a look at my stuff n see what i can see!
>>>
>>> most grateful thanks!
>>>
>>> Marcus
>>>
>>> On Wednesday, July 21, 2004, at 06:17 PM, x x wrote:
>>>
>>> let me know if you got my info on the chip # ic 34 page six of the
>>> repair manual for vers one and 2 is the same in this realm. TC40H138
>>> fails there will be no xound heard for some or all of the groups.
>>> This seems logical to assume that since all other functions seem
>>> working that this would be the answer.When you get it to work I have
>>> patches to trade.Good luck
>>> Alien
>>>
>>> ∗/Marcus Wilson /∗ wrote:
>>>
>>> sounds like an excellent start anyway!@
>>>
>>> i have put my poly to one side at the moment, as i had no clue as to
>>> where to proceed, this at least gives me a direction.
>>>
>>> once again thank you for the info, hopefully it will bring one more
>>> poly back to life!
>>>
>>> thanks!
>>>
>>> Marcus
>>> On Monday, July 19, 2004, at 05:34 AM, x x wrote:
>>>
>>>> Ok im looking up chip today you will have to find the chip on the
>>> net
>>>> I dont think ill have one to spare. It wasnt easy locating the last
>>>> set ...
>>>> It sounds so like the main problem described in the tech notes up
>>> date
>>>> that I fixed a poly with ....
>>>> Will let you know today.
>>>> Patrick
>>>>
>>>> Marcus Wilson wrote:
>>>>
>>>> awesome!~
>>>> i'd be very keen to find out more.
>>>>
>>>> Mine was dead until i replaced a couple of power transistors in
>>> the +/-
>>>> 5V stage that were buggered, and had been poorly messed with by a
>>>> previous owner.
>>>> I bought mine for $10 in a carpark junk sale, and took it home,
>>>> managed to get the midi control side going so now i can control my
>>>> other gear with the poly,
>>>>
>>>> all of the patches etc can be edited stored etc, and i managed to
>>>> reload factory settings too, but no sound out.
>>>>
>>>> It looked like the clock and everything was performing properly
>>> but no
>>>> tone out of the tone generator.
>>>>
>>>> Soldering is easy for me, so if you can point me to the correct
>>>> component, i should be able to make it happy again, and that
>>> would be
>>>> awesome!
>>>>
>>>> thanks again for your info so far.
>>>>
>>>> Marcus
>>>> On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>>>>
>>>>> It is one toshiba chip that needs to be replaced.
>>>>> It is mentioned in the service manual should all work but no
>>> sound be
>>>>> heard from the poly 800. Its on the main board. The number of the
>>>> chip
>>>>> is on my schematics . I cant gurentee it but it is in the service
>>>>> notes. apperntly enough of the same prob happend that this was a
>>>> major
>>>>> note. Im not saying this is or isnt .But Ive bought a few poly
>>> 800s
>>>>> and its one or the other chips for the output control to the
>> sound
>>>>> source of the poly 800....
>>>>> If interested Ill get the part number and email the service
>>> note. If
>>>>> you can solder very finely its not a big chip. I dont know if I
>>> have
>>>> a
>>>>> spare im pretty much building up parts to keep for me when this
>>>>> happens again. SinceI have three and I bought some extras let
>>> me see
>>>>> what I find out when I look through my parts bin I collect
>> toshiba
>>>>> chips and major processors for the poly .Im now starting to
>>> with the
>>>>> juno. I will sale poly 800 keys now and some other stuff .This
>>> will
>>>>> also change I bid on every broken one I can find...
>>>>> Peace
>>>>> Alien
>>>>>
>>>>>
>>>>> Marcus Wilson wrote:
>>>>>
>>>>> mines a poly800 yeah
>>>>>
>>>>> all works for midi control
>>>>> no tone generation tho
>>>>>
>>>>> looking for a working tone generator for it
>>>>>
>>>>> Marcus
>>>>> On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
>>>>>
>>>>>> is that a poly 800?
>>>>>>
>>>>>> Marcus Wilson wrote:
>>>>>>
>>>>>> have you got any tone generator chips you could send me?
>>>>>>
>>>>>> my poly works on the digital side, all the patches store etc,
>>> midi
>>>>> out
>>>>>> works, just nothing comes out of the tone generator!
>>>>>>
>>>>>> ive put a cro over the data lines, and signals and clock all
>>> appear
>>>>> to
>>>>>> be working, just that chip has no output on the tone lines.
>>>>>>
>>>>>> any help available?
>>>>>>
>>>>>> best regards,
>>>>>>
>>>>>> Marcus in Oz
>>>>>> On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
>>>>>>
>>>>>>> I collect dead poly 800s////
>>>>>>>
>>>>>>> skunkride wrote:
>>>>>>>
>>>>>>>
>>>>>>> Nice one Julio ! Gives me hope about my dead Poly....
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
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