[TechAssist] Re: Rockwood 800W-4CH
- From: "Rafael Gallegos" <gallegra@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 14 Feb 2002 18:52:57 -0700
most of these amps use irfz44 fets, you can get those from dalbani corp
they sell for about 1.50 each, the 48 ohms and the c914 must be the
snubber filter in the power supply, I think the typical value of the cap
is .0027 uF. after you replace bad components check for pulse out of the
lm494, frecuency should be around 35khz amplitud 12v they come out of
pin 9 and 10 of lm494.
GOOD LUCK.
>>> rstek@xxxxxxxxxx 02/14/02 02:57PM >>>
I'm going to warn you about those amps, I bet the MOSFET's in the
power
supply are bad and are quite expensive. Also was it connected
backwards to
damage it or did it overheat? Also Rockwood amps are on the lower end
of
the quality scale. I'd check the large diode across the12v in. If
it's
shorted or open then it's going to be expensive. I work on a lot of
MA
Audio and Audiobahn amps as well as enter simple competitions with my
own
setup so I've seen a lot of different amps. Unless the cust. has deep
pockets and has someone who can re-install it properly as well as set
it up.
Frank
Rs-Tek
----- Original Message -----
From: <tvdoctors@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 14, 2002 2:23 PM
Subject: [TechAssist] Rockwood 800W-4CH
> Giving an estimate on this 800 watt car stereo amp. Looks like the
only
problem I can see is in the power supply circuit. C914 is shorted and
in
series with R919 which is discolored. R919 measures 48 ohms and is a 1
watt
resistor. I have no model number or schematic for this unit but hope
that
someone out there might have some info on this unit. Besides the
numbers
listed above, it also says Scorpion on the plexiglas top plate that
lights
up and the whole thing is chrome and red
>
> TV Doctors 108 W. Main St. Monroe,Wa. 98272 360-794-6469
>
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Rafael Gallegos
Lead electronics technician
Rockford corp.
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