help reading a circuit diagram

[Maxmerx]

Hello forum,
I'm trying to repair an old amplifier (Philips f4212), I would need some help with one component, I don't understant what number 2522 is.
Thank you for your help.
https://goo.gl/photos/bJn2QmCmbVB6UUvPA

Max

 

[MaxHeadRoom78]

Photo does not show?
M.

 

[Ian Rogers]

Wow!! That's a lot of caps... Must be a big circuit..... over 3586 resistors and over 2528 capacitors....

 

[Maxmerx]

In case the link didn't work, here the pictures.
The component is the 2522. I don't know what it is, I just know that is broken on one side and it has many small cracks, probably due to age and heat.

 

[Les Jones]

It is a mullard C280 series polyester capacitor 18 nF (0.018 uF) 10% tolerance 250 volt DC rating. I would think any film capacitor of the correct value will work in that application. (Tone control circuit.) If it is faulty it will not stop the amplifier from working. It will prevent the tone control from working. As others have said the 2522 is just a component number. The 18n is the value in nF which ties up with the colour coding on the picture of the capacitor.

Les.

 

[Maxmerx]

Thank you very much for the quick reply and detailed explanation.
regards
Max

 

[Nigel Goodwin]

Wow!! That's a lot of caps... Must be a big circuit..... over 3586 resistors and over 2528 capacitors....

As there's no smiley I don't know if you were joking or not, but fairly obviously the component numbers don't start at one

At a guess, they start at 2500 for resistors, and 3500 for capacitors - transistors 'perhaps' start at 1500? - it's just a weird Philips thing.

 

[Ian Rogers]

Cheers for clearing that up.... I would suppose a big company that produces several boards for one product would do this...

I always start at 1.. Live and learn!!

 

[alec_t]

According to an ex-Philips guy :-
"The first digit identifies the type of component which helps when looking at the pcb layout diagram rather than the schematic.
1000 Misc (Switch, connector etc)
2000 Capacitor
3000 Resistor
4000 Jumper
5000 Coil, Relay or Transformer
6000 Diode
7000 Transistor or IC
8000 ?
9000 ?

The second digit refers to the pcb. All the components on the same board start in the same range, for example
1) if a tuner board is 1, the capacitor numbering starts at 2101, the resistors start at 3101 etc,
2) if a front board is 4, the switch numbering starts at 1401, coils at 5401 and IC's 7401 etc.

The last two digits are incremental (the second digit can change if there are more than 99 components of the same type)."

 

[Colin]

"8000 ?
9000 ? "

8000 and 9000 is for when they invent things like MOSFETs.

 

[gophert]

"8000 ?
9000 ? "

8000 and 9000 is for when they invent things like MOSFETs.

Umm. I wonder what that T in MOSFET means.

 

[audioguru]

Umm. I wonder what that T in MOSFET means.

Thingy. It is a Metal Oxide Semiconductor Field Effect Thingy. Some people even call an ordinary bipolar transistor a thingy.

 

[ShawnR]

Lol