Soundstream Reference 404

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kmarei

Member
Joined 2010
i picked up a Soundstream reference 404
but the power supply has issues
the mosfets for the power supply are bad
or at least 2 or 3 are
i will replace all 6
they are smp50n06-25, but i can't find them on mouser
An externally hosted image should be here but it was not working when we last tested it.


but is there anything else i should check before i order the parts?
i know one resistor looks dodgy( marked in red), so i will order that as well
but if it's known 2 mosfets are burnt, is there something to check ?

An externally hosted image should be here but it was not working when we last tested it.
 
K

kmarei

Member
Joined 2010
so all 6 of group 1 are to be replaced with IRFZ44
driver transistors are groups 4 and 5? i should check those.
what about 2 and 3? are those power circuit or related to the outputs?
An externally hosted image should be here but it was not working when we last tested it.



the rectifiers are the grey rectangles with the lightning symbol on them?
measure resistance of those?
they all measure 0.1 ohm
An externally hosted image should be here but it was not working when we last tested it.
 
K

kmarei

Member
Joined 2010
Perry Babin said:
The components with the lightning symbols are circuit breakers.

2 = rectifiers
3 = regulators
4 and 5 = output transistors

If you notice, all of the important letters are capitalized. The lower case 's' makes it plural.
Click to expand...

i'm having a hard time testing the mosfets
i'm getting weird measurements
none of the readings match
and i don't want to unsolder all of them to do the correct testing
i might as well replace them in the process

do you think its ok if i just replace all of them?
doesn't that buy me peace of mind later on?
don't want to replace 3 now, only for the 4th to die on me later
plus this unit is in very good condition both inside and out, so i don't mind investing in it to make it work at its best

i can't find the part number you listed for the driver transistors 2SA1562
i found the IRFZ44s so i will order 6 of those
now i need the part numbers for the 2 regulators, the 4 rectifiers, and the 16 driver transistors

thank you very much:)
 
P

Perry Babin

Member
Joined 2003
bcae1.com
There are only 6 MOSFETS in this amp. You already stated that you were going to replace all 6.

The BD140 may be good sub but you'll have to install it facing the opposite direction because the pin configuration is reversed.

It's unlikely that the regulators have failed. The rectifiers are easy enough to check in the circuit.

Are you referring to the output transistors as 'driver' transistors?
 
K

kmarei

Member
Joined 2010
Perry Babin said:
There are only 6 MOSFETS in this amp. You already stated that you were going to replace all 6.

The BD140 may be good sub but you'll have to install it facing the opposite direction because the pin configuration is reversed.

It's unlikely that the regulators have failed. The rectifiers are easy enough to check in the circuit.

Are you referring to the output transistors as 'driver' transistors?
Click to expand...


sorry i might be using the wrong terminology :)
i refer to all things with 3 legs as mosfets :)

i meant the 8 output transistors for each channel
but instead of testing the rectifiers and regulators, i was thinking of just replacing them
unless you have any data on what numbers i should be getting if i measure them in circuit?

when i flipped over one of the output transistors, it says TIP107
those i found.
is that what part you were reffering to when you said 2SA1562?
 
M

mike49504

Member
Joined 2006
The Power supply fets All have to be replaced . The ones with the yellow arrow pointing to them..

The outputs are the ones in the pic of the red arrows pointing to them There should be Both Tip 107's and Tip 102's in the red boxes with the arrows pointning to them..


The drivers for the power supply fets are circled on top of the board in the 2nd pic u need to test thoose also..


For testing the outputs in circuit set your meter to diode check and test as followed..

Legs 1-2
Legs 1-3
Legs 2-3

Do you get anything near 0 when u test them if so post the results as followed

1-2:
1-3:
2-3:

The rectifiers and regulators very rarely fail you dont need to replace them if they arent defective
 

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K

kmarei

Member
Joined 2010
Ok, i tested everything

for the 2 2SA1562s
1st
1-2: 0.007v and the meter beeps
1-3: 0.639v
2-3: 0.635v
2nd
1-2: 0.012v and the meter beeps
1-3: 0.641v
2-3: 0.634v

for the small round silver coloured cylinders with 3 legs
1-2: 0.644v
1-3: 0.001v and the meter beeps
2-3: 0.539v
second one
1-2: 0.645v
1-3: 0.014v and the meter beeps
2-3: 0.539v

for the outputs
for the 8 tip107s
1st
1-2: OL (i assume Over Limit)
1-3: 1.338v
2-3: 0.484v
2nd
1-2: OL
1-3: 1.338v
2-3: 0.484v
3rd
1-2: OL
1-3: 1.314v
2-3: 0.486v
4th
1-2: OL
1-3: 1.314v
2-3: 0.486v
5th
1-2: OL
1-3: 1.355v
2-3: 0.485v
6th
1-2: OL
1-3: 1.355v
2-3: 0.485v
7th
1-2: OL
1-3: 1.355v
2-3: 0.485v
8th
1-2: OL
1-3: 1.355v
2-3: 0.485v

for the 8 TIP102s
1st
1-2: 0.458v
1-3: 1.074v
2-3: OL
2nd
1-2: 0.458v
1-3: 1.074v
2-3: OL
3rd
1-2: 0.457v
1-3: 1.148v
2-3: OL
4th
1-2: 0.457v
1-3: 1.148v
2-3: OL
5th
1-2: 0.456v
1-3: 1.114v
2-3: OL
6th
1-2: 0.456v
1-3: 1.114v
2-3: OL
7th
1-2: 0.457v
1-3: 1.093v
2-3: OL
8th
1-2: 0.457v
1-3: 1.093v
2-3: OL

for the 2 regulators
1st
1-2: 0.885v
1-3: 0.428v
2-3: 0.640v
2nd
1-2: 0.753v
1-3: 0.990v
2-3: 0.445v

for the 4 rectifiers
1st
1-2: 0.4v
1-3: beep
2-3: 1.92v
2nd
1-2: 0.4v
1-3: beep
2-3: 1.92v
3rd
1-2: beep
1-3: beep
2-3: beep
4th
1-2: beep
1-3: beep
2-3: beep


if i had to guess
i'd say the outputs are all ok
the regulators are ok, but too different from each other so replace
the rectifiers, 2 are bad, other 2 ok (but might as well replace, to be safe)

am i correct?
:)
 
K

kmarei

Member
Joined 2010
for the rectifiers
the 1st and 2nd are FEN16DT
the 3rd and 4th are FEP16DT

for the 2 regulators
1st is LM337T
2nd is LM317T
(shouldn't they be the same?)

and when i looked at the power supply transistors
the right side is bulging a little, on both of them
that's the side that has the 1-2 junction
 
M

mike49504

Member
Joined 2006
The regulators are corrct..

The LM317 controls the Positive regulated voltages

The LM337 controls the Negative regulated voltages


The Fep16dt is for the positive rail voltages

The Fen16dt controls the Negative rail voltages..


So yes thoose are all the correct parts in the amp
 
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