Axis does not turn on. No light on, no smoked parts. The motor in circuit reads 3 K ohms on each leg.
This appears to be an early model S/N 002851.
Any help would be greatly appreciated.
Klinker
This appears to be an early model S/N 002851.
Any help would be greatly appreciated.
Klinker
Hi,
you need to check the mains lead fuse.
any fuses either side of the mains transformer.
check with a multimeter there is AC into and out of the mains transformer.
check there is appropriate DC to the circuit boards.
after that circuit details are needed.
🙂/sreten.
you need to check the mains lead fuse.
any fuses either side of the mains transformer.
check with a multimeter there is AC into and out of the mains transformer.
check there is appropriate DC to the circuit boards.
after that circuit details are needed.
🙂/sreten.
Check the fuse.... No transformer on an axis psu by the way.
Also check the high voltage caps and resistors of 15K (big ones).
Also check the high voltage caps and resistors of 15K (big ones).
Your absolutely right. It's abvious you've seen this before.
Linn was kind enoough to send me the schematic for the board.
It has no values so I calculataed the 15K resistors. Do you know what wattage they are? They look like 3 or 4 watt metal oxide.
Thanks to everyone for the help.
Regards,
Klinker
Linn was kind enoough to send me the schematic for the board.
It has no values so I calculataed the 15K resistors. Do you know what wattage they are? They look like 3 or 4 watt metal oxide.
Thanks to everyone for the help.
Regards,
Klinker
Dunno wattage but the 5 Watt Welwyn that I fitted have been 100 % for 6 months or so now.
Does one of them measure high?
Does one of them measure high?
Thanks for the input, I ordered 3W. I couldn't find 5W metal oxide.
Yes, I'll be glad to if I can figure out how!!
Klinker
Yes, I'll be glad to if I can figure out how!!
Klinker
Hi All,
I too have a dead Axis - no turn on the motor and no LEDs illuminated. I can get the motor to spin by applying power direct to the motor terminals, but not through the board.
Has anyone found a solution or can advise what to change out?.
Also can anyone supply a circuit diagram ?
Thanks.
I too have a dead Axis - no turn on the motor and no LEDs illuminated. I can get the motor to spin by applying power direct to the motor terminals, but not through the board.
Has anyone found a solution or can advise what to change out?.
Also can anyone supply a circuit diagram ?
Thanks.
Linn Axis schematic PCAS011
Thanks to LINN I'm able to forward the schematic to anyone who emails me at: *klink_f@msn.com. Please remove the * before mailing.
Happy listening.
Thanks to LINN I'm able to forward the schematic to anyone who emails me at: *klink_f@msn.com. Please remove the * before mailing.
Happy listening.
Hi Klinker,
Just wondering if you ever managed to revive your Axis PSU ?.
I e-mailed you about the schematic about a week ago - not sure if you received it. My Axis suffered similar fate - no life signs apart from mains voltage 'everywhere' on the board. I've managed to get hold of a schematic since, but am struggling to make sense of it. Any thoughts / advice would be much appreciated.
Redart.
Just wondering if you ever managed to revive your Axis PSU ?.
I e-mailed you about the schematic about a week ago - not sure if you received it. My Axis suffered similar fate - no life signs apart from mains voltage 'everywhere' on the board. I've managed to get hold of a schematic since, but am struggling to make sense of it. Any thoughts / advice would be much appreciated.
Redart.
I have a dead axis power supply also. I"ll replaced the filter caps and the coupling caps but I"m still getting low voltage at the motor output. 26V on one leg, 16V on the other leg at 331/3 and 26V and 19V at 45 rpm. I think one of the power transistors is blown. I would really appreciate a copy of the schematic also.
tkwou,
If you still need schematic I can e-mail it to you. Don't think this board supports file attahments.
Redart
If you still need schematic I can e-mail it to you. Don't think this board supports file attahments.
Redart
Hi ReDart. That would be great if you could email it to me. I'm having quite a time trying to sort out the circuit from the pcb traces.
tkwou,
The board is a bit of a head scratcher for sure. Watch out for the mains voltages !.
The forum's e-mail links don't seem to allow attachments so I'll need your actual e-mail address.
The board is a bit of a head scratcher for sure. Watch out for the mains voltages !.
The forum's e-mail links don't seem to allow attachments so I'll need your actual e-mail address.
Many thanks to Redart and Klinker for your assistance. I finally repaired my Axis power supply but not without significant trials and tribulations. I certainly learned my lesson. Never embark on repairing a complex circuit without a schematic and doing your research first. I had just finished fixing my Valhalla supply so when my Axis supply died I assumed the similar parts had died. In restrospect I was correct. Replacing all the electrolytic filter caps, decoupling caps and coupling caps got the power supply working again but the motor would only start up and run for about ten seconds and then stop. Assuming there was still something wrong I proceeded to find out what. It was only after speaking to the Linn technician that I discovered that this was normal. The Axis power supply starts up at 70V and then switches to quiet mode after about ten seconds when the output drops to under 25V where it will stays until it detects load. Once a load is detected it will adjust voltage to keep the speed consistent, ie it will not run without the platter connected. Too little knowledge too late for me. While trying to figure what was wrong I accidently shorted the motor outputs. Many things blow when this happen. The surge protector blew. The power transistors for each motor winding blew. I replaced these items and the output circuit was up and running with all the right voltages but the ps still didn't work. I checked the low voltage circuit and I only got 2.2 volts across the 15V zener. I replaced the zener with no change. I knew something was badly shorted in the low voltage circuit. I hooked up a 12v ps directly to the low voltage circuit. The output opamp chip got real hot. I replaced the LM324 opamp and my low voltage went up to 9V. A bit better.
My V+ was now 9V but the V/2 was only 2.2V. This was traced to a short in the CMOS switch 4066 chip. Now the V+ was up to 12.5V. Then I replaced the other LM324 in the load sensing circuit and V+ was back to the normal 13.5V. The LED's lit up properly with the switch and I got 33 1/3 but no 45rpm and no response to load. The voltages at the motor seemed alright. The problem was the 10 ohm resistor that lifts the common winding off of ground. Well after all that I'm finally up and running again. Thanks again. Never would have made it without the schematic.
My V+ was now 9V but the V/2 was only 2.2V. This was traced to a short in the CMOS switch 4066 chip. Now the V+ was up to 12.5V. Then I replaced the other LM324 in the load sensing circuit and V+ was back to the normal 13.5V. The LED's lit up properly with the switch and I got 33 1/3 but no 45rpm and no response to load. The voltages at the motor seemed alright. The problem was the 10 ohm resistor that lifts the common winding off of ground. Well after all that I'm finally up and running again. Thanks again. Never would have made it without the schematic.
Hi,
I have a Linn Axis with a blown powersupply. So when I googled about it, I found this forum and this thread. Is it possible, also to get the schematics you guys were talking about? That would really be great! my e-mail is silverface<at>gmx.net
Thank you very much,
silverface.
I have a Linn Axis with a blown powersupply. So when I googled about it, I found this forum and this thread. Is it possible, also to get the schematics you guys were talking about? That would really be great! my e-mail is silverface<at>gmx.net
Thank you very much,
silverface.