hi there
i have a small problem with this amplifier... to be exact with relay that does muting/output selection.. it works fine when i put a bit pressure on it... on power on it usually clicks several times instead of just once 😕
i tried to look in service manual but under part name says only SSY-107
google also doesn't find anything useful
so i'm asking if anyone knows the substitution for this relay ?
thanks for your reply
i have a small problem with this amplifier... to be exact with relay that does muting/output selection.. it works fine when i put a bit pressure on it... on power on it usually clicks several times instead of just once 😕
i tried to look in service manual but under part name says only SSY-107
google also doesn't find anything useful
so i'm asking if anyone knows the substitution for this relay ?
An externally hosted image should be here but it was not working when we last tested it.
thanks for your reply
Are you 100% sure it is the relay at fault and not the drive to the relay that is responding to the pressure... in other words a poor joint in the amp somewhere and the relay is doing its job of protecting the speakers.
You need to measure the voltage across the relay coil to be sure it is present and the relay NOT engaging.
If the relay is faulty then there should be suitable replacements available. They usually follow a standard pinout. Coil voltage and its resistance would have to be matched and the rating of the contacts at least as high as the original.
You need to measure the voltage across the relay coil to be sure it is present and the relay NOT engaging.
If the relay is faulty then there should be suitable replacements available. They usually follow a standard pinout. Coil voltage and its resistance would have to be matched and the rating of the contacts at least as high as the original.
will check it out and report.. but since now there hasn't been any problems that's why i think its the relay
hi there
i'm pretty sure it's the relay... everything seems fine.. no poor joints
voltage across coils is present
and the relay also reacts to slightest touch from side.. like poke it a bit it works normally... poke it again it doesnt work anymore
i'm pretty sure it's the relay... everything seems fine.. no poor joints
voltage across coils is present
and the relay also reacts to slightest touch from side.. like poke it a bit it works normally... poke it again it doesnt work anymore
From what you say that does point to the relay. If the voltage is present across the relay coil then it should work.
As to a replacement. You will have to determine if it is a standard pin out by comparing against other relays in the catalogues. It might help to see a picture of the underneath of it. If a pin compatible one can't be found then it's a simple matter to hard wire a different replacement in.
You need to measure the coil resistance (it says its a 24 volt coil on the relay) and choose one with similar or higher resistance. If it was much lower then it may not operate correctly or overload the relay driver transistor. Seeing the circuit of the relay driver would help in that case.
As to a replacement. You will have to determine if it is a standard pin out by comparing against other relays in the catalogues. It might help to see a picture of the underneath of it. If a pin compatible one can't be found then it's a simple matter to hard wire a different replacement in.
You need to measure the coil resistance (it says its a 24 volt coil on the relay) and choose one with similar or higher resistance. If it was much lower then it may not operate correctly or overload the relay driver transistor. Seeing the circuit of the relay driver would help in that case.
strangely it started to work properly .. probably because i was fiddling with muting/output selection circuit.. so this thread can be closed and deleted 🙂
But will it last 😀
Its well worth going over all the joints on the PCB to resolder them, particularly any parts that run hot.
Its well worth going over all the joints on the PCB to resolder them, particularly any parts that run hot.
well you were right about lasting part... they are back 🙁
so this is what my relay looks like from the bottom
also i'm going to put it in another case that is more opened to monitor the problems right away...
so this is what my relay looks like from the bottom
An externally hosted image should be here but it was not working when we last tested it.
also i'm going to put it in another case that is more opened to monitor the problems right away...
Lets be sure...
Monitor the DC voltage across D412 constantly and see what happens to it when the amp fails.
The joint highlighted is typical of one that could become a problem The solder is "crusty" around the component lead and looks to have formed an inner ring. Thats absolutely typical of a dry joint and you will almost certainly find these throughout the amp. R401 is a 3 watt resistor feeding the relay. Check the joints on it.
If the 24 volts relay drive voltage is present across D412 then you are going to have to "make" a new relay fit either by hardwiring or by drilling the PCB to accomodate a different pin spacing.
Monitor the DC voltage across D412 constantly and see what happens to it when the amp fails.
The joint highlighted is typical of one that could become a problem The solder is "crusty" around the component lead and looks to have formed an inner ring. Thats absolutely typical of a dry joint and you will almost certainly find these throughout the amp. R401 is a 3 watt resistor feeding the relay. Check the joints on it.
If the 24 volts relay drive voltage is present across D412 then you are going to have to "make" a new relay fit either by hardwiring or by drilling the PCB to accomodate a different pin spacing.
Attachments
i already heated up some critical joints power transistors.. relay... inputs.. etc
i'll solder one UTP wire on that contact to monitor it when it's working for few hours (if it will) 😀
i'll solder one UTP wire on that contact to monitor it when it's working for few hours (if it will) 😀
You need your meter ACROSS D412. Nothing else will do 🙂
Don't measure from ground to the relay, the measurement has to be across it (which is D412)
Don't measure from ground to the relay, the measurement has to be across it (which is D412)
I have deal many times with this problem, if you tap it and it comes back, well just open relay and use a small file and make those relay contact shiny, they are making bad contacts inside relay due to sparking from contacts with time.😉
Hi, i have an su-v505 with noise in left channel. I checked the power and pre transistors and everything its ok. I'm note two resistor in vamp plate that not comes in service manual which are damaged.
could you please help me by testing in your 505 the value of the two resistor?
could you please help me by testing in your 505 the value of the two resistor?
hi, sory for delay.
the two resistors are in short-circuit. if its possible know the value?
thank you
the two resistors are in short-circuit. if its possible know the value?
thank you
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
identified in service manual as J ????
- Status
- Not open for further replies.