Accuphase C-280, E-303X, P-266, P-300L, P-500 and others diagrams, repair etc.

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A

as_audio

Member
Joined 2008
I was looking for a schematic or service manual of P-300L (problem solved).

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.

Thank you for response.

Edit: 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

Edit: P-266L schematics in post 25,
C-280 in post 36 ,
P-500 in 37,
E-303X in 38.
P-300 L see post 67 - 68 69.

Edit: Accuphase P-11 power amp schematic in post 42

C-240 preamp schematic is in post 43.

M-60 mono power amp service manual see post 44.

E-303 power amp schematic here https://www.diyaudio.com/forums/solid-state/360711-accuphase-303-dc-offset-issue.html#post6362484

Somebody offered Service manual for E-550 Integrated Amp in post 45, see also post 55.

Many Accuphase and other schematics listed here : Schematics – Audio-Circuit [.dk]

More Accuphase manuals, even for service : Accuphase manuals | Hifi Manuals Free: Service Manuals, Owners Manuals, Schematics online for free download .. is this https://www.vintageshifi.com/ now defunct ?

Accuphase P-600 schematic photo is here :
https://www.diyaudio.com/community/threads/accuphase-p600.410952/#post-7644118
 
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djk

djk

R.I.P
Joined 2001
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).
 
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A

as_audio

Member
Joined 2008
Accuphase P300L transformer failure

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.
 
A

as_audio

Member
Joined 2008
djk said:
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).
Click to expand...

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.
 
A

as_audio

Member
Joined 2008
as-audio said:
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.
Click to expand...

Please read and use 0.4 amps.
 
M

masood

Member
Joined 2010
djk said:
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).
Click to expand...

dear sir,
me too send this schematics. my e mail is [Redacted by moderation].
thanks
 
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