I did not know where to locate this thread, so if there is a better place, please a mod that locates it correctly.
I had a small accident with the remote control of my Prima Luna amplifier.
It fell to the ground from about 1.50 m (it is made of wood) and the impact was so great that it left a mark on it.
It did not work from that moment, I swear I only took a single glass of alcoholic drink enjoying good music ...... 😀
When I opened it, I immediately noticed that the impact destroyed the plastic battery holder and detached a connection.
I got one of terrible quality but that fulfills its function.
All tested, the circuit is powered, but the classic test of activating it in front of the cell phone camera did not work.
Ask the experts, how the crystal oscillator is the main suspect (I have not found defective SMD welding with the naked eye) it is so fragile as to stop working with a blow?
Thanks in advance !
I had a small accident with the remote control of my Prima Luna amplifier.
It fell to the ground from about 1.50 m (it is made of wood) and the impact was so great that it left a mark on it.
It did not work from that moment, I swear I only took a single glass of alcoholic drink enjoying good music ...... 😀
When I opened it, I immediately noticed that the impact destroyed the plastic battery holder and detached a connection.
I got one of terrible quality but that fulfills its function.
All tested, the circuit is powered, but the classic test of activating it in front of the cell phone camera did not work.
Ask the experts, how the crystal oscillator is the main suspect (I have not found defective SMD welding with the naked eye) it is so fragile as to stop working with a blow?
Thanks in advance !
I have some news:
I have reviewed the only diode (1) and appears to be in good condition, that is, it leads in only one direction.
But there is no reading on the ohmmeter when I test the infrared emitting diode (2), it is as if it were the same "open", that is, without conductivity.
I really do not have experience with them, I do not know if this is an index that is defective or maybe it is normal, in any case, how should it be tested?
If it is defective, can it be replaced with a similar one from other CRs or must it be exactly the same? I would like to clarify this before continuing to move forward.
Can anyone answer if the oscillating crystals are so delicate as to be damaged by a blow?
Keep in mind that this CR has a considerable weight, what I have reported is as it is, the battery compartment they see is the new one, the original I threw it in the trash, they were of a rigid plastic and it was split by the blow, I would have liked that you see the state of it ! 😱
You can enlarge the image, thanks again.
I have reviewed the only diode (1) and appears to be in good condition, that is, it leads in only one direction.
But there is no reading on the ohmmeter when I test the infrared emitting diode (2), it is as if it were the same "open", that is, without conductivity.
I really do not have experience with them, I do not know if this is an index that is defective or maybe it is normal, in any case, how should it be tested?
If it is defective, can it be replaced with a similar one from other CRs or must it be exactly the same? I would like to clarify this before continuing to move forward.
Can anyone answer if the oscillating crystals are so delicate as to be damaged by a blow?
Keep in mind that this CR has a considerable weight, what I have reported is as it is, the battery compartment they see is the new one, the original I threw it in the trash, they were of a rigid plastic and it was split by the blow, I would have liked that you see the state of it ! 😱
You can enlarge the image, thanks again.
Attachments
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Has a leg on the 455kHz ceramic resonator (the yellow do-dah) fractured? Just gently move it left to right and see if there is a break where the lead enters the body.
Ketje and Mooly
Thanks for your contributions ! 🙂 , I am with a flu-like state in bed, just overcome it, I will check those welds ! 😉
Thanks for your contributions ! 🙂 , I am with a flu-like state in bed, just overcome it, I will check those welds ! 😉
Hello friends :
It has been three days in which the flu had me very bad, but "bad grass never dies," it is said. (thanks Mooly) The most curious thing is that this year I vaccinated for the first time against it, and it has not been effective. It seems that viruses are not all the same and you have to be lucky even with the vaccine they apply to us!
Well, already told my classic OT,
let's go to ours. 😉
Today I gathered courage and decided to fix the RC.
As you can see in the photos, both the oscillator and the transistor were solidly tinned, so that was ruled out.
Then I went in search of the fault using the voltmeter, I had already verified that the circuit was powered ......
Well, but because I supported the tip (+) just between the rivet and the connecting leg! , there was continuity by the pressure exerted with the hand, closing the circuit of a defective connection ! ... 😡
(see the red arrow)
Actually, one can spend hours without noticing this, the poor quality of the battery holder.
I bought a new one (provided with the cables), I installed it temporarily, and it went perfectly.
The rest was desoldering, passing a small wick, rewiring, welding and arming.
Also, the new spare does not differ too much in manufacturing quality with the previous one, so I will try not to fall again .....
😀
It has been three days in which the flu had me very bad, but "bad grass never dies," it is said. (thanks Mooly) The most curious thing is that this year I vaccinated for the first time against it, and it has not been effective. It seems that viruses are not all the same and you have to be lucky even with the vaccine they apply to us!
Well, already told my classic OT,
let's go to ours. 😉
Today I gathered courage and decided to fix the RC.
As you can see in the photos, both the oscillator and the transistor were solidly tinned, so that was ruled out.
Then I went in search of the fault using the voltmeter, I had already verified that the circuit was powered ......
Well, but because I supported the tip (+) just between the rivet and the connecting leg! , there was continuity by the pressure exerted with the hand, closing the circuit of a defective connection ! ... 😡
(see the red arrow)
Actually, one can spend hours without noticing this, the poor quality of the battery holder.
I bought a new one (provided with the cables), I installed it temporarily, and it went perfectly.
The rest was desoldering, passing a small wick, rewiring, welding and arming.
Also, the new spare does not differ too much in manufacturing quality with the previous one, so I will try not to fall again .....
😀
Attachments
Nicely documented 🙂 Those kind of problems can be really infuriating and tricky to spot. Well done.
Thank you !
In effect, it is as you say, I confess that in a moment, some curses came out of my mouth .....
(I will not say to whom they were directed ) 😉
Uff, this went well, luckily, I'm happy.
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