Robert Gault wrote:

What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?

The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Robert Gault wrote:

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Two of the bridge diodes were dead. While I was in there I replaced the
two electrolytic caps and the LM324N. It's working!

By the way, I've found a source for the service manual. When it arrives
I'll try to upload it to one of the turntable site (probably
www.vinylengine.com).

Thanks to all for the help.
--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

Robert Gault wrote:

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Two of the bridge diodes were dead. While I was in there I replaced the
two electrolytic caps and the LM324N. It's working!

By the way, I've found a source for the service manual. When it arrives
I'll try to upload it to one of the turntable site (probably
www.vinylengine.com).

Thanks to all for the help.
--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

Robert Gault wrote:

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Two of the bridge diodes were dead. While I was in there I replaced the
two electrolytic caps and the LM324N. It's working!

By the way, I've found a source for the service manual. When it arrives
I'll try to upload it to one of the turntable site (probably
www.vinylengine.com).

Thanks to all for the help.
--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

Robert Gault wrote:

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Two of the bridge diodes were dead. While I was in there I replaced the
two electrolytic caps and the LM324N. It's working!

By the way, I've found a source for the service manual. When it arrives
I'll try to upload it to one of the turntable site (probably
www.vinylengine.com).

Thanks to all for the help.
--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

On my TD166, I hadn't used it for about a year. When I finally did turn it
on, I discovered that one of the power supply electrolytic caps had shorted.

Pete

Robert Gault wrote in message
...
Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or
a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

On my TD166, I hadn't used it for about a year. When I finally did turn it
on, I discovered that one of the power supply electrolytic caps had shorted.

Pete

Robert Gault wrote in message
...
Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or
a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

On my TD166, I hadn't used it for about a year. When I finally did turn it
on, I discovered that one of the power supply electrolytic caps had shorted.

Pete

Robert Gault wrote in message
...
Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or
a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

On my TD166, I hadn't used it for about a year. When I finally did turn it
on, I discovered that one of the power supply electrolytic caps had shorted.

Pete

Robert Gault wrote in message
...
Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or
a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.

Len Moskowitz wrote:
Robert Gault wrote:


What voltage, if any, do you read at the motor terminals? Likewise as
you move from the wall mart through the PCB board?


The regulator diodes are overheating, indicating a short somewhere. The
two analog ICs (LM324N and MC34001) are not getting Vcc. I disconnected
the motor (which should be run by 110 VAC anyway) and saw no change (as
expected). I pulled both ICs and saw no change. There's one
small three-terminal device that could be either a voltage regulator or a pass
transistor -- that's the next thing I'll look at.

Anyone know what voltage Thorens runs its analog ICs at?

I'm trying to track down a schematic or service manual for the TD-146.
All leads appreciated.

Make sure that none of the diodes in the full wave bridge have blown.
This is frequently a problem.