Service Manual with Schematics for PL0171

[marcok]

Joe ,
I know that 5 uF is not a standard value ,
but all the bords of PL 4000 use both 4,7 and 5 uF ,as described exactly in the service manual .
I realized this fact when I recapped all boards in 2 PL 4000 units .
Also PL 1000 has the same caps .
For me it's very strange and infact I replaced 5uF caps with 4,7 uF .
Ciao
Marco

 

[Gepetto]

Joe ,
I know that 5 uF is not a standard value ,
but all the bords of PL 4000 use both 4,7 and 5 uF ,as described exactly in the service manual .
I realized this fact when I recapped all boards in 2 PL 4000 units .
Also PL 1000 has the same caps .
For me it's very strange and infact I replaced 5uF caps with 4,7 uF .
Ciao
Marco

They used whatever they had Marco

The PL config control was not very strict.

 

[marcok]

Thank you Joe .
It's plausible ! It was only a curiosity .
Ciao
Marco

 

[Northwinds]

I have 3 questions for ED and for all :
- 2) Why PL 400c is not DC coupled ?
Ciao
Marco

My amp says Direct Coupled right on it and has that board so I am lost as to your question

 

[laatsch55]

Marco is referring to the Direct/normal coupling switch on the 700's.

 

[Northwinds]

Marco is referring to the Direct/normal coupling switch on the 700's.

Ok gotcha

 

[marcok]

No Lee ,
I'm referring to pl 400 C board on PL 400 .
The schematic is clear : input - cap - Q1 base .
I can't verify anything because my father's PL 400 has pl 14 a/b board .
Probably it's a mistake , but .....

Ciao
Marco

 

[laatsch55]

Sorry Marco, I stand corrected...

 

[marcok]

Lee ,
no problem : it's a normal mismatch .
Anyway I can't understand the input circuit of PL 700
( it has two imputs and a switch for normal / dc coupling ,
while PL 700b has only a switch that shorts a cap )
and the circuit of volume pot in PL 4000 .
In these cases there are not inconsistencies with diagrams .
Ciao
Marco