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Post by 24century on Sept 5, 2018 16:34:16 GMT -5
It is a nice smaller woofer and it use to work for the previous years but not anymore.
Put it is the garage with no use about a year then it reacting like this:
When it powers on from cold (off the power line) it work for a while (a few hours) by hearing the sound and watching the power LED light but the power light from front panel went off and of course no bass will be produce, , can provide service manual, need help |
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Post by 24century on Sept 6, 2018 13:44:41 GMT -5
Opened up and did the initial visual check, no bad caps by eyes check I can tell but I have a feeling it has to be the caps was causing the problem
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Post by mastertech on Sept 6, 2018 16:03:22 GMT -5
If you think it is caps then you need to start ESR ing them. Otherwise you should start testing voltages.
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Post by 24century on Sept 6, 2018 16:16:10 GMT -5
Can you instruct where can I start to test voltages?
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Post by mastertech on Sept 6, 2018 17:18:21 GMT -5
Well I guess first would be on the main (2) PCB test across C241 for about +8v
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Post by 24century on Sept 7, 2018 12:06:02 GMT -5
I am getting +8V (7.82) by C241 all time
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Post by mastertech on Sept 7, 2018 14:14:45 GMT -5
Thats good. Now on Main 1 pcb test across caps C29,C30,C58 and C59.
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Post by 24century on Sept 7, 2018 16:06:09 GMT -5
C29 14.30v
C30 14.80
C58 47.7
C59 47.6
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Post by mastertech on Sept 7, 2018 20:18:51 GMT -5
Ok, good. Now on main 3 pcb, locate ic201. Use pin 1 for your neg probe of your DMM and test all 7 remaining pins on the ic with pos probe and give me all the voltages.
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Post by 24century on Sept 8, 2018 16:26:50 GMT -5
IC201
Pin2 4.12V
Pin3. 6.49
Pin4. 7.81
Pin5 5.2V
Pin6. 2.93
Pin7. 3,24
Pin8. 7.81
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Post by mastertech on Sept 8, 2018 18:15:13 GMT -5
That all looks good. Is the green power light on?
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Post by 24century on Sept 8, 2018 23:09:51 GMT -5
That all looks good. Is the green power light on? Yes the green light is on, but the test is from cold start and that last sometime till it will shut itself off. |
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Post by mastertech on Sept 9, 2018 9:17:50 GMT -5
I thought it was not working anymore but if it is still working cold for a few hours then all of this testing was not relevant. You would have to test after it stopped working.
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Post by 24century on Sept 9, 2018 11:45:20 GMT -5
Will do and let you know, and, that will take some time to wait to produce the problem
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Post by 24century on Sept 10, 2018 14:05:15 GMT -5
So far it works as the way it suppose to be for the entire yesterday, put boards in and screws back because it is hard to monitor the work status, front panel has the light to show.
Was using it as the 2ndary woofer with my main stereo via a Y connector, when it happens, front panel light just went off, can't wake it up not until a full power circle.
Now doing a directly solo connection, will get the V read once it happens again, thx
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