I switch it on and one of two things happens. Either its fine, or I get no sound out from it. Then the next day it works fine again - or maybe it doesn't.
When the sound stops, it stops on both left and right channels. I get no output from CD or radio or tape so it looks like the problem is in the audio amplifier stage. Volume control rotates but has no effect. There is nothing audible from the speakers. The display light etc are on so the PSU is presumably OK. Powering on-off doesn't fix it.
I waited till it stopped working, and opened it up and "wiggled" all the connectors but it made no difference then, or after reseating them. I cannot see any dry joints, split tracks or burned components by quick inspection. I think I may have started it working after tapping it strongly suggesting an intermittent or dirty contact, or a split track in a PCB. If so, it affects both left and right channels so it must be somewhere where one fault stops both channels.
I can borrow an oscilloscope :-) but I don't have a circuit diagram :-(.
A circuit diagram would be fantastic or even hints as to how it works, or which components are which - eg which is the amplifier(s), or a circuit diagram of a system which uses the same audio chip(s) so I at least have an audio circuit to work from. WHat is the chip set number?
I am thinking of following the audio signal from the volume control.
Does anyone know how the volume control works? Does the audio signal appear across the volume control, and a proportion is fed into a constant-gain amplifier from the wiper? Or does the audio NOT appear across the volume control, and instead goes direct into the amp, and the volume control provides a control signal to the amp varying its gain?
If anyone can help I will be very grateful. It's probably not worth paying to get it repaired as it would cost more than a new one, but I hate to be beaten by what must be a really simple fault.
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Sounds like you system is set up to only provide output current when not charging via the array... its common... shut off or disconnect panels and your problem is solved but the batteries won't be receiving any charge obviously... this set up is used when the systemhas nothing to limit or control the current produced from the arrays/panels from going directly to the attached output devices. This is typical in small pv systems.
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This sounds to me like the loading mechanism is having problems. It may be as simple as the grease gumming up a bit, or the motor having a dead spot. Without seeing the machine itself, it is hard for me to say. I'd rebuild the loading mechanism and regrease it. Figure on the local labor rate for this repair as no parts should be required unless the motor has failed.
There are several things to consider re this fault.....
Normally on small systems there is a selector switch to allow you to select what you need to listen to...for example if you want to play a CD then you select the CD mode, insert the CD push play and away it goes....
In your case you need to select Radio, or maybe select AM or maybe select FM, one of these should be accessed from a digital read out menu where you select your requirements.
Please have a good look at the operating manual to see if you can work out how to select the required listening mode, and you will be sweet...
That's what we call parallel connections, Yes it's possible, but will decrease the sound wattage of the amp. Having these connections is risky, you do not want to shortage the speaker output of your amp by making mistakes of wire's color coding. Other than that, it should be fine......
A Real Speaker Jacks..
There should be a switch position on your system that you move to allow the sound to come out to standard speaker configuration or to multiple speaker configuration.
This switch may be on the front or rear panel.
Please have alook to see if its there....
Its possible the these Real speaker jacks are not wired to anything inside the amp system, and are there for use on a different model where the selector switch is supplied.
B Cassett Deck..
The clicking is caused by the motor trying to drive the wheels that turn the cassett tape.
It sounds like something is jamming the internal drive mechanism.
The drive belt may have come off or is stretched and is slipping.
Have a good look inside the front slot and you may see one of these items described above happening..