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Driverboard. Boss audio amp
Driverboard. Boss audio amp
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Old 3rd April 2016, 07:13 AM   #1
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
Default Driverboard. Boss audio amp

Anyone know the value of these 2 resistors that are missing ?
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Old 3rd April 2016, 07:51 AM   #2
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
R50 = 220 ohms
R93 = 1.2k
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Old 8th April 2016, 08:32 AM   #3
S Merlington is offline S Merlington  United States
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Do you happen to know the value of R84? I noticed it was burnt also

1 other question also do you know what transistors commonly fail on this board ?

There are 4 outputs in this amp 2 of the outputs get hot fast the outputs that are heating up are the outputs with their 3rd leg connected to the inductor .
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Old 8th April 2016, 09:10 AM   #4
Perry Babin is offline Perry Babin  United States
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R84 = 560 ohms.

If the 560 ohm resistor burned, it's not a common failure. You'll have to check every component.

Those outputs are the high-side outputs. Their drivers are the four transistors nearest to the op-amp.
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Old 8th April 2016, 10:37 AM   #5
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
Found the problem ..

Someone tried to repair this before ..

They had MPSA42'S in Q42,43,44 they should be MPSA92'S
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Old 20th October 2017, 11:59 AM   #6
MarioRestucci is offline MarioRestucci  Italy
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Join Date: Aug 2012
Location: NAPOLI
Hi, anyone have schematic for this driver board?
i've tried to reverse enginering, but i've failed.
my email joetvanelliclub@gmail.com
thanks to all
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Old 11th November 2017, 03:30 AM   #7
jacampb2 is offline jacampb2  United States
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Join Date: Aug 2007
Location: Beaverton, Mi 48612
Quote:
Originally Posted by MarioRestucci View Post
Hi, anyone have schematic for this driver board?
i've tried to reverse enginering, but i've failed.
my email joetvanelliclub@gmail.com
thanks to all

Generic Asian Clone driver board RE and Clone
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