[DSP-10] Fwd: Re: DSP10 question

[Yamamoto Jiro]

This mail from Ron was sent to me, but looks like the one for this 
mailing list. So it is just being forwarded to here... 

Jiro JQ2LMG

----- Begin forwarded message -----
From: Ron Meiring <rmeiring at iinet.net.au>
Date: Mon, 21 Mar 2005 05:38:59 +0800
To: Yamamoto Jiro <jyamamoto at katch.ne.jp>
Subject: Re: DSP10 question
X-Mailer: PocoMail 2.63 (1077) - Licensed Version

To all replying to this topic.

Thank you for the ideas and tips on how to remove the IC.
I decided to sacrifice the IC, because I don't rely on them after 
removal. (and the value of the board is more than the component ...)

Any way I lost 3 pads doing that. 
Pad 14 lost, no problem, this was only a pad, with no connection.
Pad 15 same thing.
Pad 16 minor problem, have to make a small bridge to C56, which is 
fed from R44.

All in all scary stuff. I have never heard from Chip Quick, sounds to 
good to be true. Will see if I can order it here in VK.
Who has a good source  for the MC145170  (U7)

On Jiro's picture I also noticed that Q105 and Q106 where not mounted 
as shown on the top Silk. Is that how they should be mounted.

Noticed theat the voltage regulators U103 and U13 had the same 
problem. Is there more like this.

I mounted the Mixers under the board, had the feeling that this would 
give better isolation and grounding to the mixer ... Any feedback 
here ?



On Sun, 20 Mar 2005 22:50:29 +0900, Yamamoto Jiro wrote:
> Ron san
> 
> Here are the pictures for U110, U7 and U6 from my DSP-10;
> 
>     <http://bagdad-cafe.homedns.org/mono/dsp10/U110.gif>
>     <http://bagdad-cafe.homedns.org/mono/dsp10/U7.gif>
> 
> Seeing your picture attached in the mail, U110 is correct. U6 is
> hard
> to see... Maybe it is OK. Unfortunately U7 seems to sit upside
> down...
> You need to remove U7 first. I think that is not easy without a
> special
> removing iron.... If you don't have it, I hope someone on the list
> will
> help you by an alternative way (I want to know it if any!) Be
> careful
> not to damage the IC. It is very fragile. Good luck!
> 
> Jiro JQ2LMG
> 
> On Sun, 20 Mar 2005 20:12:54 +0800, Ron Meiring wrote:
>> Hello Jiro San,
>> 
>> I have a DSP10 here, but am not sure about where pin 1 is on U7
>> and on U110.
>> 
>> Normally an IC has a point or something to indicate where pin 1 is
>> situated. I got my package from Tapr and can't work out where pin 1
>> is.
>> 
>> At least I am not 100 percent sure.
>> 
>> Could you please show me how these IC's are mounted.
>> 
>> Kind regards
>> Ron  VK6KDD
> 
>