Accuphase P300L and others Service Data

[as-audio]

I am looking for a schematic or service manual.

Data of the mains transformer alone would be nice also,
because it is burnt.

This is not for the first time a defective transformer is
encountered on Accuphase amps or japanese gear
in general.

The german importer will not provide schematics any
more "because of sole property of Accuphase". This has
been different in the past though.

I can help with diagrams for C240 , C280 , E202 , E204 ,
E303 , E305 , P11 , P266 , P500 as paper copies, maybe
PDF later.
Edit for search engine: C-240 , C-280 , E-202 , E-204 ,
E-303 , E-305 , P-11 , P-266 , P-500

Thank you for response.

[djk]

I have the schematics for the P300, send me your e-mail address if you want them (two bit-map about 2.3MB).

Transformer has dual 120-100-0 primary. 54.5-47-0-47-54.5 secondary with 20-0-20 also.

I would check the voltage selector, the 10A (slo-blo) Primary fuse, and the four 2A
Secondary fuses. There may be an internal thermal fuse in the transformer (although none is shown).

[as-audio]

A short in one of the electrolytic capacitors C28 or C29 on the
main amp boards leads to destruction of the bridge rectifier D28
and subsequent failure of the mains transformer. R76, R77 went
open on this board subsequently.

I strongly recommend to insert fuses in the two yellow transformer
leads to prevent this. 0.2 amps slow blow should be fine. The trans-
former wiring can be accessed from the bottom of the amp.

This transformer has an internal thermal fuse, but in my workshop
the defective item had an internal short, both thermal fuse and main
fuse were OK.

[as-audio]

Originally Posted by djk

I have the schematics for the P300, send me your e-mail address if you want them (two bit-map about 2.3MB).

Transformer has dual 120-100-0 primary. 54.5-47-0-47-54.5 secondary with 20-0-20 also.

I would check the voltage selector, the 10A (slo-blo) Primary fuse, and the four 2A
Secondary fuses. There may be an internal thermal fuse in the transformer (although none is shown).

On the P300L the primary windings are as indicated by djk.

The secondaries are
yellow stacked 55V
red main48V
black ground
red main48V
yellow stacked55V
and
green grey green 15.5 , ground, 15.5V for meters etc.

[as-audio]

Originally Posted by as-audio

A short in one of the electrolytic capacitors C28 or C29 on the
main amp boards leads to destruction of the bridge rectifier D28
and subsequent failure of the mains transformer. R76, R77 went
open on this board subsequently.

I strongly recommend to insert fuses in the two yellow transformer
leads to prevent this. 0.2 amps slow blow should be fine. The trans-
former wiring can be accessed from the bottom of the amp.

This transformer has an internal thermal fuse, but in my workshop
the defective item had an internal short, both thermal fuse and main
fuse were OK.

Please read and use 0.4 amps.

[masood]

Originally Posted by djk

I have the schematics for the P300, send me your e-mail address if you want them (two bit-map about 2.3MB).

Transformer has dual 120-100-0 primary. 54.5-47-0-47-54.5 secondary with 20-0-20 also.

I would check the voltage selector, the 10A (slo-blo) Primary fuse, and the four 2A
Secondary fuses. There may be an internal thermal fuse in the transformer (although none is shown).

dear sir,
me too send this schematics. my e mail is khan.shahid251@gmail.com.
thanks

[ionbogie]

I am looking for The service manual for Accuphase P 266 actualy I need it to reset the bias on my amp does anybody has this service manual ???
or know where to get one ?