Hi guys
I'm having a problem with my subwoofer that I'm attempting to fix. The thing is that the timeout for auto switch-off is just about 1 minute. As you can imagine, it switches off and on quite frequently during TV programs and even movies.
I already tried increasing the sub volume in my AVR, but that didn't help. Even setting the sub at +10db and the main speakers at -10db doesn't help. The timeout delay of 1 minute is just too short, as there are many movies and TV programs that don't send low frequencies for this amount of time interval. I also tested different cables.
I already sent the sub back to the manufacturer, but the guy in charge said that after testing it, their conclusion was that the problem is my AVR. I don't agree.
The sub in particular is a Taga Harmony Platinum SW-10 v.2. The manual has about 2 pages without any schematics.
I'm good at technology in general but not particularly in electronic design and repair. So here's my thought process and pictures I took after opening the sub.
On the PCB I can see a bordered area marked "Caution, High voltage". On the border at that area is a relay, it looks like it's connecting the main board with the high voltage area. My common sense says that this relay must be the one taking care of the auto-standby.
On the low voltage side of the relay:
- one pin goes to a transistor of which I think one leg is connected to GND
- other pin goes to a 47 Ohm resistor and then a cap of 330 uF.
I was thinking of replacing the 330 uF cap with a 680 uF cap (biggest electrolytic cap I could find with the same diameter, which is 8mm) but I would 1) really need a second opinion on this because I'm just guessing here really and 2) if that would double the standby timeout from one to two minutes, that still may not be enough.
Specs of the relay:
cirrus logic
jzc-32f
005HS
pick up voltage: 3.75 V
drop out voltage: 0.25 V
max allowable voltage: 6.5 V
If you guys could share your insight and some of your magic, that would be greatly appreciated!
I'm having a problem with my subwoofer that I'm attempting to fix. The thing is that the timeout for auto switch-off is just about 1 minute. As you can imagine, it switches off and on quite frequently during TV programs and even movies.
I already tried increasing the sub volume in my AVR, but that didn't help. Even setting the sub at +10db and the main speakers at -10db doesn't help. The timeout delay of 1 minute is just too short, as there are many movies and TV programs that don't send low frequencies for this amount of time interval. I also tested different cables.
I already sent the sub back to the manufacturer, but the guy in charge said that after testing it, their conclusion was that the problem is my AVR. I don't agree.
The sub in particular is a Taga Harmony Platinum SW-10 v.2. The manual has about 2 pages without any schematics.
I'm good at technology in general but not particularly in electronic design and repair. So here's my thought process and pictures I took after opening the sub.
On the PCB I can see a bordered area marked "Caution, High voltage". On the border at that area is a relay, it looks like it's connecting the main board with the high voltage area. My common sense says that this relay must be the one taking care of the auto-standby.
On the low voltage side of the relay:
- one pin goes to a transistor of which I think one leg is connected to GND
- other pin goes to a 47 Ohm resistor and then a cap of 330 uF.
I was thinking of replacing the 330 uF cap with a 680 uF cap (biggest electrolytic cap I could find with the same diameter, which is 8mm) but I would 1) really need a second opinion on this because I'm just guessing here really and 2) if that would double the standby timeout from one to two minutes, that still may not be enough.
Specs of the relay:
cirrus logic
jzc-32f
005HS
pick up voltage: 3.75 V
drop out voltage: 0.25 V
max allowable voltage: 6.5 V
If you guys could share your insight and some of your magic, that would be greatly appreciated!
Attached Files
Thanks again.
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