[Coco] CoCo2 PAL version service manual

[univax!gatech!destroyer!trantor!kandur]

Used to repair large number ofCRT VDUs having several 40 pin dips, 
like CPUs, character generators, etc. First I ground small side cutters to
narrow tips, that fit between the pins and cut them off one by one.
It was too slow and cumbersome. Then I used a Dermel cutting disc
to cut off the pins on each side, close to the case.
After that desoldered each pin individually, using solder wick or
solda-pult. Later attached an 1/8" thick copper strip to a 750 degs
Weller tip and desoldered 20 pins on each side, pulling them out at once.
If needed, some holes had to be cleaned out before a socket was installed.

Kandur

Thursday, January 8, 2015, 10:12:19 AM, you wrote:
> Definitely a temp-controlled iron is one of the first things to get if you
> are going to assemble more than a few boards.
> I bought one of these about a year ago, and it’s been one of the best
> $100 purchases I’ve ever made.  They’re even cheaper now.
> A couple of hundred thousand solder joints later, it’s still working great.  
> I used a $20 (or so) Radio Shack soldering iron before it, and I almost 
> cringe at the thought of going back to it, lol…

> The hot air is a nice option too, I’ve used it on smd stuff a few times,
> although a properly used iron is often quicker and easier for a lot of that.

> <http://www.ebay.com/itm/2-IN-1-HOT-AIR-SMD-REWORK-SOLDERING-IRON-STATION-w-5-tips-s4-852D-/331441138511?hash=item4d2b6e6b4f
> <http://www.ebay.com/itm/2-IN-1-HOT-AIR-SMD-REWORK-SOLDERING-IRON-STATION-w-5-tips-s4-852D-/331441138511?hash=item4d2b6e6b4f>>

> I bought one of these recently, when it became painfully obvious I was going
> to need an oscilloscope when working with video circuits.  Being able to see
> the signals in a circuit really opens your eyes to exactly how blind you were to
> what was going on before.

> <http://www.ebay.com/itm/HANTEK-200MHz-Digital-Storage-Oscilloscope-DSO5202B-/221584092234?pt=BI_Oscilloscopes&hash=item339770ec4a
> <http://www.ebay.com/itm/HANTEK-200MHz-Digital-Storage-Oscilloscope-DSO5202B-/221584092234?pt=BI_Oscilloscopes&hash=item339770ec4a>>

> In my opinion an oscilloscope is needed for anything beyond basic circuit debugging and
> repairs.  Otherwise you end up guessing in the dark way too much.

> - Ed




>> On Jan 8, 2015, at 11:32 AM, Daniel Campos <daniel.campus at gmail.com> wrote:

>> Hi Gene,

>> 2015-01-08 14:28 GMT-02:00 Gene Heskett <gheskett at wdtv.com>:



>>> But the scope is first, because without it, you are so blind that the
>>> soldering iron might as well be left unplugged.

>>> Please don't take this as a rant Daniel, but as friendly advice from
>>> someone who really has been there and done a lot of "that". Nearly 70
>>> years worth of BTDT. Tested and passed for certificates (A C.E.T.) and
>>> licenses (FCC 1st Phone) along the way. Bought a few T-Shirts along the
>>> way too. ;-)



>> Yes, a scope is a formidable tool for a hobbyist, but I always left it
>> aside for other concerns. In fact I also need to acquire a temperature
>> regulated solder iron and one of those Hako desoldering guns, those are
>> impressive!



>>> Cheers Daniel, Gene Heskett
>>> --


>> Regards,
>> Daniel

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