Return To The ZX450v.2

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:19 pm

Alright, here we are.......I have begun the work on the ZX450v.2......this is what it looked like originally....no LED's, gain pots are a bit too wide, a chip is missing near the speaker terminals......I was going to paint it......but now I will be sending it to Hyde's Custom Franking Shop for a Frank'd out finish of some kind

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:21 pm

Here I cleaned the 450 up just a bit

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:26 pm

Here it got LED's......and then I tried a LED fan

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:34 pm

Then I stripped it and painted it.....but I'm liking that Hyde finish....so it's stripped again

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:37 pm

Then I cleaned the board, in preparation for working on it

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:45 pm

While cleaning it, I came across these.....here's what Jason said about them

That resistor smokes because of high DC on the input signal. Either a problem at the HU, or the line out is in hard clipping and you have what amounts to pulsed DC on the input. The Capacitor acts like a dead short to DC and passes it all through that 1/8w resistor to physical ground. If it is over driven hard enough, long enough it burns the little critter up.

dBincognito · Post by **dBincognito** » Thu Jul 30, 2009 8:56 pm

Which brings us to now......today I removed the input and rail capacitors, all of the NE5532P op-amps....got started on the BA4560 op-amps....and removed the sections of wire that were remaining from the OEM fan, and the OEM remote wire.

Post by **smgreen20** » Fri Jul 31, 2009 6:33 am

How much time, patience, and practice does it take to de-solder things and have a clean, unburnt looking board?
What exactly do you use to suck up the solder? Solder sucker? Is that what they're called? What wattage iron do you use? I have an M50 board that needs parts added to it, but until I get a job she's on hold.

Looks good.

lopezi · Post by **lopezi** » Fri Jul 31, 2009 7:54 am

smgreen20 wrote:How much time, patience, and practice does it take to de-solder things and have a clean, unburnt looking board?
What exactly do you use to suck up the solder? Solder sucker? Is that what they're called? What wattage iron do you use? I have an M50 board that needs parts added to it, but until I get a job she's on hold.

Looks good.

I've always used this stuff and have had great success. Smaller components on a board you may want to use a 15W fine tipped iron and for larger components (transistors with thicker leads or other larger components) a 30W regular tip....some irons have a switch between low and high output.

dBincognito · Post by **dBincognito** » Fri Jul 31, 2009 9:34 am

smgreen20 wrote:How much time, patience, and practice does it take to de-solder things and have a clean, unburnt looking board?
What exactly do you use to suck up the solder? Solder sucker? Is that what they're called? What wattage iron do you use? I have an M50 board that needs parts added to it, but until I get a job she's on hold.

Looks good.

Desoldering everything on this board took about 2.5 hours......it's not that hard, more tideous than anything....you need good eyes and a steady hand.....I use a solder sucker....inexpensive...like $10, and much faster than copper braid....I use a 60 watt iron.

Here we are now.....all of the BA4560 op-amps have now been removed.

knightrider358 · Post by **knightrider358** » Fri Jul 31, 2009 2:15 pm

this would be a great how-to upgrade or replace post randy, Great work man! I salute ur talented hands. I hope the same goes into the 2 amps I sent and gave u to have them turn out great amps. Keep up the photos and instructions man.

oldskoolmseriesfan · Post by **oldskoolmseriesfan** » Fri Jul 31, 2009 5:13 pm

Another great job Randy. You have way more patience than I, that is for sure, and dont worry I will get those amps and eq installed, Ive just been really, really busy with things.