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RF Prime R500-1d help identify components!
RF Prime R500-1d help identify components!
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Old 3rd November 2017, 11:12 PM   #1
ray9043 is offline ray9043  Mexico
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Default RF Prime R500-1d help identify components!

Hi everyone! Im trying to fix a Prime r500-1d, 2 months ago i fix a Jl jx 500/1 is the same board and has the same problem, the ic mp18021 is blown, but this one has the board very burnt.


Anyone here has a good quality Pic of the board? I foubd one but i cant read the resistor values and the tracks.

Thanks!
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Old 3rd November 2017, 11:25 PM   #2
Perry Babin is offline Perry Babin  United States
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jl amp
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Old 4th November 2017, 12:01 AM   #3
ray9043 is offline ray9043  Mexico
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Thanks men!!
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Old 4th November 2017, 01:20 AM   #4
ray9043 is offline ray9043  Mexico
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Hi Perry , do you know the diode value for D12 location? Its in parallel with the 33ohm resistor on each MOSFET gate.
Other doubt, the pin 3 of the ic DVRH is tied to ground or where is tied?

Thanks
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Old 4th November 2017, 01:33 AM   #5
ray9043 is offline ray9043  Mexico
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I found d15 and d16 in short, labeled l4w, schotky barrier 30v single diode. I cant find It!! Can i replace with 1n5818? Both are 30v schotky diodes.
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Old 4th November 2017, 01:35 AM   #6
Perry Babin is offline Perry Babin  United States
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Not 100% sure but the diode is likely a 1n4148 type switching diode.

One drv goes to one bank of FETs, the other drv output goes to the other bank of FETs.
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Old 4th November 2017, 01:45 AM   #7
Perry Babin is offline Perry Babin  United States
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BAT54 is readily available.
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Old 4th November 2017, 03:26 AM   #8
ray9043 is offline ray9043  Mexico
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Ok, i live in México, very hard to find smd components, i Will look on some amp boards i have around.
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Old 4th November 2017, 05:07 AM   #9
Perry Babin is offline Perry Babin  United States
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Digikey and mouser likely ship to Mexico.
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Old 8th November 2017, 09:11 PM   #10
ray9043 is offline ray9043  Mexico
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Hi! Bad news, i put new mp18021, and the schotky diodes, now the 494 is off, i try to replace the lm358 with no luck. If i tie the pin 16 of the 494 to ground, pwm signal appears on the Gates. Any ideas?
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