Grundig V7200

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starbender
Messaggi: 15
Iscritto il: mar 23 ott 2018, 21:51

Grundig V7200

Messaggio: # 5357Messaggio starbender
dom 30 dic 2018, 20:58

I'm trying to save busted v7200.

Someone messed with it pretty bad. I repaired most of the parts. But I can't be sure about the right side. Because right sidd foil side already destroyed by former owner. Service manual is not show traces clearly.

Is anyone have v7200 here? If so,can you please took pictures of the right foil side?

Thanks

grunf
Messaggi: 363
Iscritto il: ven 27 apr 2018, 19:41

Re: Grundig V7200

Messaggio: # 5378Messaggio grunf
mar 1 gen 2019, 21:25

I'm not sure I understand what you mean with "right foil side"... can you post a picture of the defective part?
Il Cancro

starbender
Messaggi: 15
Iscritto il: mar 23 ott 2018, 21:51

Re: Grundig V7200

Messaggio: # 5385Messaggio starbender
mer 2 gen 2019, 13:32

I mean; bottom pcb traces are destroyed. Service manual has bad scan quality, traces are not clearly visible. So I need something to compare. A photo of undamaged pcb traces for an example. If this is not possible, I have to trace schematic.
20181226_073322.jpg

grunf
Messaggi: 363
Iscritto il: ven 27 apr 2018, 19:41

Re: Grundig V7200

Messaggio: # 5390Messaggio grunf
mer 2 gen 2019, 21:23

Here's the link to some pictures I took from my second V7200, not in great condition, hope they can help. Ignore the grey cables soldered and glued...
https://drive.google.com/open?id=1dfAwc ... wxkZkBhfS7
Il Cancro

starbender
Messaggi: 15
Iscritto il: mar 23 ott 2018, 21:51

Re: Grundig V7200

Messaggio: # 5400Messaggio starbender
gio 3 gen 2019, 11:22

Thank you so much! That will definitely help :)

starbender
Messaggi: 15
Iscritto il: mar 23 ott 2018, 21:51

Re: Grundig V7200

Messaggio: # 6351Messaggio starbender
sab 16 feb 2019, 12:05

grunf ha scritto:
mer 2 gen 2019, 21:23
Here's the link to some pictures I took from my second V7200, not in great condition, hope they can help. Ignore the grey cables soldered and glued...
https://drive.google.com/open?id=1dfAwc ... wxkZkBhfS7
Still trying to revive this v7200. I'm stuck somewhere..

How hermal shalter wired to the board? Thermal shalter has two cables goes to speaker post socket. I'm not sure if this two cable tied to the same spot on board or not. I seen photos around the web pin 1 and 2 soldered seperately but shorted on board. But pcb schematic shows its not. Anyone knows how it is wired and soldered?

Two channels has same behaviour. I adjust bias to 30mv. But it begins to rise step by step until 100mv. It takes 3-5min to reach this high bias. There is some sort of oscillation i think. Output transistors are tip142&147.
Allegati
20190216_140455.jpg

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