Boss BR600, digital recorder, 2006

N

N_Cook

Guest
Boss BR600, digital recorder, 2006
Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in
it. Marking
BB
??F1
probably ?? as 1 or 2 missing characters
3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest
of the circuit via the on/off switch.
Quite a bit of space to fit something bigger than the original, but what
sort of rating or identity and then data for a BB??F1 top code SMD ? So
far not found an 8pin BB powerfet identity

further reading
http://www.thegearpage.net/board/archive/index.php/t-508133.html
but no identity of the powerfet,
www images swamped with external views of course and 1 out of focus pic
of the diode fudge in the above thread
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006
Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in it.
Marking
BB
??F1
probably ?? as 1 or 2 missing characters
3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest of
the circuit via the on/off switch.
Quite a bit of space to fit something bigger than the original, but what
sort of rating or identity and then data for a BB??F1 top code SMD ? So
far not found an 8pin BB powerfet identity

further reading
http://www.thegearpage.net/board/archive/index.php/t-508133.html
but no identity of the powerfet,
www images swamped with external views of course and 1 out of focus pic
of the diode fudge in the above thread
Click to expand...


The Service Manual identifies it as VEC2302



Gareth.
 
On 12/07/2013 09:52, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006
Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in it.
Marking
BB
??F1
probably ?? as 1 or 2 missing characters
3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest of
the circuit via the on/off switch.
Quite a bit of space to fit something bigger than the original, but what
sort of rating or identity and then data for a BB??F1 top code SMD ? So
far not found an 8pin BB powerfet identity

further reading
http://www.thegearpage.net/board/archive/index.php/t-508133.html
but no identity of the powerfet,
www images swamped with external views of course and 1 out of focus pic
of the diode fudge in the above thread



The Service Manual identifies it as VEC2302



Gareth.
Click to expand...
Ta for that
Dual p-ch 3A,30V, buried in the datasheet Marking: BB
With the ex-SOIC off the board then traces are consistent with the
pinout of that IC with both devices paralleled
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krop5d$94c$1@dont-email.me...
On 12/07/2013 09:52, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006
Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in
it.
Marking
BB
??F1
probably ?? as 1 or 2 missing characters
3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest
of
the circuit via the on/off switch.
Quite a bit of space to fit something bigger than the original, but what
sort of rating or identity and then data for a BB??F1 top code SMD ? So
far not found an 8pin BB powerfet identity

further reading
http://www.thegearpage.net/board/archive/index.php/t-508133.html
but no identity of the powerfet,
www images swamped with external views of course and 1 out of focus pic
of the diode fudge in the above thread



The Service Manual identifies it as VEC2302



Gareth.



Ta for that
Dual p-ch 3A,30V, buried in the datasheet Marking: BB
With the ex-SOIC off the board then traces are consistent with the pinout
of that IC with both devices paralleled
Click to expand...


Both devices are in series:

S1 -- D1/D2 -- D1/D2 -- S1

1 7 8 5 6 3

This is in parallel with the not fitted D2, so you can just fit a diode in
position D2. Maybe a Shottky.

D2 Anode ----------- D2 Cathode



Gareth.



Gareth.




Gareth.
 
Both devices are in series:

S1 -- D1/D2 -- D1/D2 -- S1

1 7 8 5 6 3

This is in parallel with the not fitted D2, so you can just fit a diode in
position D2. Maybe a Shottky.

D2 Anode ----------- D2 Cathode



Gareth.



Gareth.




Gareth.
Click to expand...

Oops, I left my Space Echo on.



Gareth.
 
On 12/07/2013 13:16, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krop5d$94c$1@dont-email.me...
On 12/07/2013 09:52, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006
Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in
it.
Marking
BB
??F1
probably ?? as 1 or 2 missing characters
3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest
of
the circuit via the on/off switch.
Quite a bit of space to fit something bigger than the original, but what
sort of rating or identity and then data for a BB??F1 top code SMD ? So
far not found an 8pin BB powerfet identity

further reading
http://www.thegearpage.net/board/archive/index.php/t-508133.html
but no identity of the powerfet,
www images swamped with external views of course and 1 out of focus pic
of the diode fudge in the above thread



The Service Manual identifies it as VEC2302



Gareth.



Ta for that
Dual p-ch 3A,30V, buried in the datasheet Marking: BB
With the ex-SOIC off the board then traces are consistent with the pinout
of that IC with both devices paralleled



Both devices are in series:

S1 -- D1/D2 -- D1/D2 -- S1

1 7 8 5 6 3

This is in parallel with the not fitted D2, so you can just fit a diode in
position D2. Maybe a Shottky.

D2 Anode ----------- D2 Cathode



Gareth.



Gareth.
Click to expand...
I was going to put an IRF9532 in there as plenty of space for a TO220
but I've no idea what the seriesing is all about so a couple of
paralleled shottky SM diodes went in at D2 pads, reassembling/testing
next week.
 
"N_Cook" wrote in message news:krpgn2$e8k$1@dont-email.me...

On 12/07/2013 13:16, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krop5d$94c$1@dont-email.me...
On 12/07/2013 09:52, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006
Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in
it.
Marking
BB
??F1
probably ?? as 1 or 2 missing characters
3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest
of
the circuit via the on/off switch.
Quite a bit of space to fit something bigger than the original, but
what
sort of rating or identity and then data for a BB??F1 top code SMD ? So
far not found an 8pin BB powerfet identity

further reading
http://www.thegearpage.net/board/archive/index.php/t-508133.html
but no identity of the powerfet,
www images swamped with external views of course and 1 out of focus
pic
of the diode fudge in the above thread



The Service Manual identifies it as VEC2302



Gareth.



Ta for that
Dual p-ch 3A,30V, buried in the datasheet Marking: BB
With the ex-SOIC off the board then traces are consistent with the pinout
of that IC with both devices paralleled



Both devices are in series:

S1 -- D1/D2 -- D1/D2 -- S1

1 7 8 5 6 3

This is in parallel with the not fitted D2, so you can just fit a diode in
position D2. Maybe a Shottky.

D2 Anode ----------- D2 Cathode



Gareth.



Gareth.
Click to expand...
I was going to put an IRF9532 in there as plenty of space for a TO220
but I've no idea what the seriesing is all about so a couple of
paralleled shottky SM diodes went in at D2 pads, reassembling/testing
next week.




That puzzled me too. I honestly can't see the point of this IC, or
understand what it does.


Gareth.
 
On 13/07/2013 09:55, N_Cook wrote:
On 12/07/2013 19:47, Gareth Magennis wrote:


"N_Cook" wrote in message news:krpgn2$e8k$1@dont-email.me...

On 12/07/2013 13:16, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krop5d$94c$1@dont-email.me...
On 12/07/2013 09:52, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006

That puzzled me too. I honestly can't see the point of this IC, or
understand what it does.


Gareth.





Owner lost the original plug in ps, and tried using another 9V one of
the wrong polarity. I changed the connector and polarity and the unit
worked for about 10 hours and then bounced back. So something to do with
reverse polarity stressing or knocking out one powerFET initially but
continued for those 10 hours with the other one or something like that
Click to expand...
 
On 13/07/2013 09:55, N_Cook wrote:
On 12/07/2013 19:47, Gareth Magennis wrote:


"N_Cook" wrote in message news:krpgn2$e8k$1@dont-email.me...

On 12/07/2013 13:16, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krop5d$94c$1@dont-email.me...
On 12/07/2013 09:52, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:krmjjn$pu4$1@dont-email.me...
Boss BR600, digital recorder, 2006

That puzzled me too. I honestly can't see the point of this IC, or
understand what it does.


Gareth.





Owner lost the original plug in ps, and tried using another 9V one of
the wrong polarity. I changed the connector and polarity and the unit
worked for about 10 hours and then bounced back. So something to do with
reverse polarity stressing or knocking out one powerFET initially but
continued for those 10 hours with the other one or something like that
Click to expand...

Talking to an engineer familiar with solar PV controls. He was reminded
of the anti-shadowing bypass "diodes" in solar panels. Otherwise a
shadow over as little as one cell will kill the output of the whole
array, so as little as a good dollop of seagull shit is all that is
required. Say 50 cell panels and each sector of 5 can be bypassed by one
of these 2pin powerFET devices built into each panel , output falls in a
sector below a trigger level and "diode" kicks in bypassing the 3amps or
so of the rest of the array but only dropping .05 volt, so overall array
efficiency drop of 1% instead of 90% or whatever with the shadow of a
chimney or telephone pole or whatever.
 
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