anyone knows about lanzar 50?

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#24
have to get back later for frequency.but pin 13-14 is shorted by pcb layout include pin 15,and goes by 2.7k to pin 2 and split to capacotor that goes to pin 3 ,other split goes to a 22k and as it looks like to middle pin of both tip147 and fen16 rectifier.and to some more after that.witch is nearly impossible to follow.
 
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#25
ok soon time for Winter hobbies again,=repair broken things, i Think the problem in this amp is the frequency by a capasitor to the pwm ciruit,it seems to benn has soldering Before,proberly Another try to solve the problem,,,well is there any limits or maby selected vaule for the capacitors for this pwm to work propertly? i Think that who was solderded in was mutch to hight, type 0,47 and i read somwhere it maby be 01. 0r 0.01..sorry for my bad English.
 
#27
i have now tested with a 0,033uf cap and now it not runs heat no more,instead now nothing happens.not even the protect led lights,( i checked both leds and them works)can i have found the right cap value? the resistor is 3k,(have not change that)
 
#30
Is it still at a point where nothing happens when you apply power, if so, post the voltage on all terminals of the TL494 driver IC.

Copy and paste the following list and fill in the blanks.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
 
#31
Pin 1: 1.425
Pin 2: 1.29 not stable
Pin 3: 1.06 not stable
Pin 4: 130mv
Pin 5: 0.6.v
Pin 6: 22.3mv
Pin 7: 0v
Pin 8: 13.6v
Pin 9: 5mv not stable
Pin 10: 6.6mv
Pin 11: 13.6
Pin 12: 1.455
Pin 13: 0.81
Pin 14: 0.81
Pin 15: 0.81
Pin 16:1.06v


all mesured with appa and use a commander 6 A regulated dc supply.
all komponents in.not correct timing for 594 not checked pinconfig so the list is from 1+16 in top and 8+9 in bottom end of ic.
 
#33
now i got it to start for first time .added ct 0.01 to the rt 3k and put bias full ccw.but drinks 3,7A in idle!! and irfz 44 goes warm (clamped) with 2piece 35x40 metal that orginally hold the parts to the chassie.i guess timing or deadtime is wrong somehow.
 
#35
forget what i wrote about getting the amp running, i was to tired to realise that i mixed up the leds,its still protection that lids.even of the run led blink ones .i solder 2 thin wire from the place for tc to a ic socket so i can test more caps without break the board with to many changes and solders. now im back to beginning with rectifiers out,and amp still goes to protection and run irfz44 hot and seems to get nothing out from place of rectifiers.maby its easyer to learn the amp to fly then repair it.🙂
 
#37
now i messed up big time.by accident i throw away the recifiers.i fought i was the irfz44 i was i mind to replace a´gain.( to many beers maby)@@@,can i use like 4001 to make a rectifier just to make the amp (maby) run in idle.you know one par with the catode together and one par with anode.and get three conections of one pair.i hope you understand. my english isnt that good, and real bad when comes to try explain in technical terms.
 
#38
4001? I've wondered about this myself as in-place of MUR1620CTR/CTRG devices. The first problem I see is 1n4001 is only rated for 50v. If you are going to try this, I suggest 1n4002/3 or 4. What's the rated voltage on rail caps? Being a 'tiny' 50 amp maybe you'd be within voltage range... Try it? Otherwise if you are going to be repairing amps; get MUR1620CT/CTR devices.
 
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