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carlday1
carlday1, Engineer
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Have a late 70/s TRANSISTOR record player model GF819/053

Resolved Question:

hi
have a late 70/s TRANSISTOR record player model GF819/053
moter powers amp . but now glass fuse on amp blows any idea/s
regards
keith
Submitted: 10 months ago.
Category: Electronics
Expert:  carlday1 replied 10 months ago.

Hi Keith,

Thank you for using Just Answer my name is ***** ***** I will help with your question. I suspect the problem is that one of the transistors has gone short circuit and that's what blows the fuse. The first thing I would suggest is to have a good look over the pcb for burn marks also have a look at the transistors for any holes in them. It may not be a transistor that has failed it could be something else but when I am looking for shorts I tend to start with semiconductors (transistors and diodes).

Do you have a multimeter? would you be looking at repairing the unit your self?

Customer: replied 10 months ago.
there r no burns on the board and have a multimeter
Customer: replied 10 months ago.
i know so much fromm when i worked at samsung years ago
Expert:  carlday1 replied 10 months ago.

I would start testing all the diodes and transistors are see if you can find any that are faulty. I will have a look and see if I can find a schematic for the player. Could you send me the make also if you could send me a photo of the amp that would be a great help too.

Customer: replied 10 months ago.
just took photo of amp just seing how to send pics to you
Customer: replied 10 months ago.
pic 3
Customer: replied 10 months ago.
amp has no diodes and not sure about transistors tested them still in amp all open circuitunless i have to take them out to test them do i
Customer: replied 10 months ago.
the transistos are AC176
Customer: replied 10 months ago.
there is 1 solid state rectifier and 1 capacitor
Customer: replied 10 months ago.
anybody there. oh well byeeee
Expert:  carlday1 replied 10 months ago.

Sorry hectic day. I always test the transistors in circuit on the diode setting on my meter. Could you check the capacitors it could be they have dried out. Did you have any buzzing on the speakers before it packed up?

Did you test the BC147 and BC148 transistors?

carlday1, Engineer
Category: Electronics
Satisfied Customers: 321
Experience: Self Employed Electronic Engineer
carlday1 and other Electronics Specialists are ready to help you
Customer: replied 10 months ago.
hi carldaysoz am now working away from home so i will contact when i get bk to look at the record player also i have ordered some transistors.
regards keith
Customer: replied 9 months ago.
hi there bk frm working away. have replaced transistors cap and fuse.now get a humming soundthen fuse blows so i am asuming the rectifier is dead.

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