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Return To The ZX450v.2
Posted: Thu Jul 30, 2009 8:19 pm
by dBincognito
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
Posted: Thu Jul 30, 2009 8:21 pm
by dBincognito
Here I cleaned the 450 up just a bit
Posted: Thu Jul 30, 2009 8:26 pm
by dBincognito
Here it got LED's......and then I tried a LED fan
Posted: Thu Jul 30, 2009 8:34 pm
by dBincognito
Then I stripped it and painted it.....but I'm liking that Hyde finish....so it's stripped again
Posted: Thu Jul 30, 2009 8:37 pm
by dBincognito
Then I cleaned the board, in preparation for working on it
Posted: Thu Jul 30, 2009 8:45 pm
by dBincognito
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.
Posted: Thu Jul 30, 2009 8:56 pm
by dBincognito
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.
Posted: Fri Jul 31, 2009 6:33 am
by smgreen20
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.
Posted: Fri Jul 31, 2009 7:54 am
by lopezi
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.
Posted: Fri Jul 31, 2009 9:34 am
by dBincognito
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.
Posted: Fri Jul 31, 2009 2:15 pm
by knightrider358
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.
Posted: Fri Jul 31, 2009 5:13 pm
by oldskoolmseriesfan
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.