I was looking at your posts on pinkfishmedia so far no schematic .
I have seen mosfets blown in SMPS and SMD large wattage resistors burnt out but as SMPS,s aren't my power supply of choice maybe somebody here will provide more information.
Looks a good engineers steel ruler in your first picture .
I have seen mosfets blown in SMPS and SMD large wattage resistors burnt out but as SMPS,s aren't my power supply of choice maybe somebody here will provide more information.
Looks a good engineers steel ruler in your first picture .
Thanks Duncan - as you will appreciate trying to proceed with no circuit diagram/schematic puts anyone at a great disadvantage.
I'm not a fan of cross-Forum Posting but needs must on occasion?
This SMPS has four open-drain MOSFETs (20N60S5) which are probably 'gubbed'! There is some scorching on the metal enclosure/sleeve but that seems to be under the ETD-39 transformer - can't find a data sheet for that either (8+4 pin) so it's not been a great start!
Glad you liked my steel ruler which is frequently used with a scalpel on various materials.
I'm not a fan of cross-Forum Posting but needs must on occasion?
This SMPS has four open-drain MOSFETs (20N60S5) which are probably 'gubbed'! There is some scorching on the metal enclosure/sleeve but that seems to be under the ETD-39 transformer - can't find a data sheet for that either (8+4 pin) so it's not been a great start!
Glad you liked my steel ruler which is frequently used with a scalpel on various materials.
No problem with me on cross-Forum Posting as it actually helps in gathering information and in any case you are far from the only one .
Yes Linn moved from Castlemilk to a "posher " area , I took a great interest in Linn and Ivor he is one of the best self promoters , no harm in that got good write ups from some UK "golden ears " like Ivan Gold who visited the Music Room that used to be in St.Vincent St.
A flat I owned was not far from there.
If you don't have a semiconductor tester a Fet/Mosfet tester is easily built but open drains are certainly not right.
Simple MM test-
How to Check a MOSFET Using a Digital Multimeter | Homemade Circuit Projects
Yes Linn moved from Castlemilk to a "posher " area , I took a great interest in Linn and Ivor he is one of the best self promoters , no harm in that got good write ups from some UK "golden ears " like Ivan Gold who visited the Music Room that used to be in St.Vincent St.
A flat I owned was not far from there.
If you don't have a semiconductor tester a Fet/Mosfet tester is easily built but open drains are certainly not right.
Simple MM test-
How to Check a MOSFET Using a Digital Multimeter | Homemade Circuit Projects
Hi Duncan - thanks for your continued interest and support.
Some of the larger components are easily measured as they have some form of ID but then we get to the ETD-39 transformer where I can't find a datasheet for this 8+4 pin configuration? Unless I know the windings I can't check?
Also the 20N60S5 FETs have me puzzled as only the two outer legs are connected leaving the central leg (Drain?) floating - never seen that before so don't know how to check - see attached image.
Some of the larger components are easily measured as they have some form of ID but then we get to the ETD-39 transformer where I can't find a datasheet for this 8+4 pin configuration? Unless I know the windings I can't check?
Also the 20N60S5 FETs have me puzzled as only the two outer legs are connected leaving the central leg (Drain?) floating - never seen that before so don't know how to check - see attached image.
I need to take a step back as I can't see the wood for the trees!
With this FETs I found a data sheet on Mouser that had this pin arrangement:-
https://www.mouser.co.uk/datasheet/2/196/SPB20N60S5_Rev.2.3-337824.pdf
I can only assume that the Drain is connected to the tab which must be conductive and is maybe flow soldered onto the PCB for it to act as a heatsink as well as the Drain connection?
With this FETs I found a data sheet on Mouser that had this pin arrangement:-
https://www.mouser.co.uk/datasheet/2/196/SPB20N60S5_Rev.2.3-337824.pdf
I can only assume that the Drain is connected to the tab which must be conductive and is maybe flow soldered onto the PCB for it to act as a heatsink as well as the Drain connection?
The reverse side has the drain -
20N60S5 INFINEON Discrete Semiconductors - Jotrin Electronics
I am sorry I cant find a schematic for the SMPS and while the ETD-39 is a standard there are many ways to wind the transformer and LInn,s could be an in-house design.
20N60S5 INFINEON Discrete Semiconductors - Jotrin Electronics
I am sorry I cant find a schematic for the SMPS and while the ETD-39 is a standard there are many ways to wind the transformer and LInn,s could be an in-house design.
Progress has been stymied as the FET heat sink tabs, which also have the Drain connection, have been flow-soldered to the PCB and through to the underside to act as a heat sink! Impossible, for me, to replace!
There is a cable with four connections from the SMPS to the Amp board - does anyone know the output voltage and current for these supplies as I'm now considering a non-Linn SMPS?
Thanks.
Thanks.
Linn SMPS
So progress with this Linn Classik Movie Di has completely stopped as I am unable to source:-
1. A replacement SMPS
2. A circuit diagram/schematic
3. Details of the outputs from the SMPS to the Amp board?
Can anyone help with any of these options - thanks in advance!
So progress with this Linn Classik Movie Di has completely stopped as I am unable to source:-
1. A replacement SMPS
2. A circuit diagram/schematic
3. Details of the outputs from the SMPS to the Amp board?
Can anyone help with any of these options - thanks in advance!
As you live in Glasgow Donald do you know anybody who works at the new factory ?
I did know somebody from the old Castlemilk factory but that was many decades ago ,on phoning him he has long retired .
I did know somebody from the old Castlemilk factory but that was many decades ago ,on phoning him he has long retired .
Linn SMPS
Thanks Duncan - although I do live in Glasgow and know a number of staff at the Watefoot factory it may as well be the others side of the world/galaxy/universe in terms of any assistance from Château Tiefenbrun!!!
Thanks Duncan - although I do live in Glasgow and know a number of staff at the Watefoot factory it may as well be the others side of the world/galaxy/universe in terms of any assistance from Château Tiefenbrun!!!
Linn was was ever thus Donald , although not related directly to your problem I have found a website where at least some Linn schematics/parts/advice is given on various Linn equipment -dated around 2000.
It is significant that Linn advises -quote- "their circuits are not easy to understand and repair and require specialized equipment to do so " -end quote -
Linn - Audio-Circuit.dk
It is significant that Linn advises -quote- "their circuits are not easy to understand and repair and require specialized equipment to do so " -end quote -
Linn - Audio-Circuit.dk
Quick update - I have obtained a Linn Miniline Universal PSU to play with. Only problem (challenge!) is that this PSU has a ten-pin output adapter while the Classik Movie Di has a four-pin input adapter! 🙂
Any pointers on a possible way forward would be most welcome.
Any pointers on a possible way forward would be most welcome.