I am by no means an expert on this type of troubleshooting but I can follow direction real well.
I'm no stranger to using a meter and soldering iron so I'm looking for some help in fixing an old amplifier/system I got. This is part of a system "V-1200" by Aiwa where there are several components. My first problem seems to be the amplifier.
It seems to be in protection. When first turned on I hear the inital relay coming on but never the second relay which is connected to the protection IC. I don't see any obvious bad components on the board. If I ground the control side of the protection relay nothing blows up... the relay clicks on and I hear a loud hum from the speaker but this may be due to the pre-amplifier. When the pre-amp is plugged in the 125hz bar of the spectrum analyzer on the amplifier lights up as if its getting a fairly loud signal at about that frequency. I have not yet attempted to jumper the protection relay without the pre-amp as they seem to need each other to work. I may try to jumper them together without the audio out portion connected but I need to find some jumpers to do so and I'm at work currently.
So, I'm asking for help in figuring out why the protection circuit isn't enabling the relay.
The repair manual is available online here:
https://archive.org/details/manual_B...e/n11/mode/2up
I'm no stranger to using a meter and soldering iron so I'm looking for some help in fixing an old amplifier/system I got. This is part of a system "V-1200" by Aiwa where there are several components. My first problem seems to be the amplifier.
It seems to be in protection. When first turned on I hear the inital relay coming on but never the second relay which is connected to the protection IC. I don't see any obvious bad components on the board. If I ground the control side of the protection relay nothing blows up... the relay clicks on and I hear a loud hum from the speaker but this may be due to the pre-amplifier. When the pre-amp is plugged in the 125hz bar of the spectrum analyzer on the amplifier lights up as if its getting a fairly loud signal at about that frequency. I have not yet attempted to jumper the protection relay without the pre-amp as they seem to need each other to work. I may try to jumper them together without the audio out portion connected but I need to find some jumpers to do so and I'm at work currently.
So, I'm asking for help in figuring out why the protection circuit isn't enabling the relay.
The repair manual is available online here:
https://archive.org/details/manual_B...e/n11/mode/2up
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