Akai AX-M400 ...

[Arfa Daily]

Why is it that no matter how many old schematics and manuals you've got
stuffed in your filing cabinets, you've never got the one you actually need
?

Anybody help me out with the schematics for this old beast ? Only need the
bit around the STK4142 output hybrid. Theres an obscure problem with it
taking about three minutes to unmute. I can see a voltage that creeps up
slowly on one of the pins, and I can see a pair of resistors that I thik it
comes via. Trouble is that area is so inaccessible for getting components
out to check the values of, so it would be helpful to just see what value
these resistors are supposed to be, as I think the 'upper' one has probably
gone high (there's what I think is probably a delay cap at the junction).

In case anyone's got the diagram, but not in pdf or can't be bothered to
scan it, the resistors in question are R20 and R21.

TIA

Arfa

 

[N_Cook]

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:21E9m.30670$qu3.9545@newsfe18.ams2...

Why is it that no matter how many old schematics and manuals you've got
stuffed in your filing cabinets, you've never got the one you actually
need
?

Anybody help me out with the schematics for this old beast ? Only need the
bit around the STK4142 output hybrid. Theres an obscure problem with it
taking about three minutes to unmute. I can see a voltage that creeps up
slowly on one of the pins, and I can see a pair of resistors that I thik
it
comes via. Trouble is that area is so inaccessible for getting components
out to check the values of, so it would be helpful to just see what value
these resistors are supposed to be, as I think the 'upper' one has
probably
gone high (there's what I think is probably a delay cap at the junction).

In case anyone's got the diagram, but not in pdf or can't be bothered to
scan it, the resistors in question are R20 and R21.

TIA

Arfa

AX M430 uses STK4142-2
R20 from gnd to pin 1, 56K
R21 from grounded 47uf to pin 2, 330R

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

 

[Arfa Daily]

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:h474cf$vak$1@news.eternal-september.org...

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:21E9m.30670$qu3.9545@newsfe18.ams2...
Why is it that no matter how many old schematics and manuals you've got
stuffed in your filing cabinets, you've never got the one you actually
need
?

Anybody help me out with the schematics for this old beast ? Only need
the
bit around the STK4142 output hybrid. Theres an obscure problem with it
taking about three minutes to unmute. I can see a voltage that creeps up
slowly on one of the pins, and I can see a pair of resistors that I thik
it
comes via. Trouble is that area is so inaccessible for getting components
out to check the values of, so it would be helpful to just see what value
these resistors are supposed to be, as I think the 'upper' one has
probably
gone high (there's what I think is probably a delay cap at the junction).

In case anyone's got the diagram, but not in pdf or can't be bothered to
scan it, the resistors in question are R20 and R21.

TIA

Arfa



AX M430 uses STK4142-2
R20 from gnd to pin 1, 56K
R21 from grounded 47uf to pin 2, 330R

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Thanks, but not quite the same. On the '400, R20 and R21 are associated with
the ripple filtering between pins 9 (supply -ve) and 8 (base of internal
transistor)

Arfa