Hello
Could someone help me troubleshoot the amp of Yamaha speakers?
This is from a friend that bout them about ten years ago and the sound was very sweet with them. Nice bass for computer speakers.
The problem is that only very low volume sound comes from speakers although i open the volume or turn it off nothing except low volume sound.
I replaced the LA4700 Chip but no difference. Problem remains
i will post some photos below for anyone willing to help of the pcb's and the voltage of LA4700
Hope this helps.
Pins Volts
1 6.5
2 0
3 6.5
4 16.5
5 13.9
6 0.6
7 0.6
8 0
9 0
10 0
11 0
12 0.6
13 0.6
14 0.6
15 0.6
16 6.5
17 0
18 6.5
Could someone help me troubleshoot the amp of Yamaha speakers?
This is from a friend that bout them about ten years ago and the sound was very sweet with them. Nice bass for computer speakers.
The problem is that only very low volume sound comes from speakers although i open the volume or turn it off nothing except low volume sound.
I replaced the LA4700 Chip but no difference. Problem remains
i will post some photos below for anyone willing to help of the pcb's and the voltage of LA4700
Hope this helps.
Pins Volts
1 6.5
2 0
3 6.5
4 16.5
5 13.9
6 0.6
7 0.6
8 0
9 0
10 0
11 0
12 0.6
13 0.6
14 0.6
15 0.6
16 6.5
17 0
18 6.5
Attachments
Finaly i found the time and did remove the pot from pcb.
The pot is Alps GT 503A.
I attached the DMM to middle pin and left pin but the measurements is 3K although i change post position.
So guess it is faulty pot since it is very loose to.
Problem is i can not find exact replacement.
From datasheet i found it is 50K
Can i connect simple stereo pot just for test purpose?
The pot is Alps GT 503A.
I attached the DMM to middle pin and left pin but the measurements is 3K although i change post position.
So guess it is faulty pot since it is very loose to.
Problem is i can not find exact replacement.
From datasheet i found it is 50K
Can i connect simple stereo pot just for test purpose?
Attachments
Finally i found the time and with a little experiment and like friend above said i used a single pot and the speakers are working again !Pictures in below link shows everything i did to repair-modifications for this speakers
Speakers Pictures
Thanks to all forum friends for their effort.
Speakers Pictures
Thanks to all forum friends for their effort.
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