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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Setting idling current
Hi...
I decided to check the idling current settings in a Denon AVR-3000. There is a complicated process involving connecting a meter of test points, adjusting intermediate voltage settings, then final settings of 3mv +/- .5mv after 10 minutes . I have the meter connected exactly as shown in the manual, but all readings are negative, not positive. Could the manual be in error about this?? Ken |
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#2
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Setting idling current
Ken123 wrote: I decided to check the idling current settings in a Denon AVR-3000. There is a complicated process involving connecting a meter of test points, adjusting intermediate voltage settings, then final settings of 3mv +/- .5mv after 10 minutes . I have the meter connected exactly as shown in the manual, but all readings are negative, not positive. Could the manual be in error about this?? Is the speaker load still connected ? That can cause errors measuring idling current. Otherwise, yes , I'm sure the manual could have got it wrong. If you understand the circuitry you may be able to deduce it from that. Graham |
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#3
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Setting idling current
"Eeyore" wrote in message ... Ken123 wrote: I decided to check the idling current settings in a Denon AVR-3000. There is a complicated process involving connecting a meter of test points, adjusting intermediate voltage settings, then final settings of 3mv +/- .5mv after 10 minutes . I have the meter connected exactly as shown in the manual, but all readings are negative, not positive. Could the manual be in error about this?? Is the speaker load still connected ? That can cause errors measuring idling current. Otherwise, yes , I'm sure the manual could have got it wrong. If you understand the circuitry you may be able to deduce it from that. Graham Yes, I left speakers disconnected as per the instructions. I'll study the schematic. Thanks. |
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#4
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Setting idling current
"Ken123" wrote in message . .. Hi... I decided to check the idling current settings in a Denon AVR-3000. There is a complicated process involving connecting a meter of test points, adjusting intermediate voltage settings, then final settings of 3mv +/- .5mv after 10 minutes . I have the meter connected exactly as shown in the manual, but all readings are negative, not positive. Could the manual be in error about this?? If the absolute values are as expected, it could simply be meter polarity. Sure, the manuals are often wrong and backwards :) |
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#5
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Setting idling current
Ken123 wrote:
Hi... I decided to check the idling current settings in a Denon AVR-3000. There is a complicated process involving connecting a meter of test points, adjusting intermediate voltage settings, then final settings of 3mv +/- .5mv after 10 minutes . **Hint: THAT is not a complicated process. It is one of the easiest things you can do. Try tuning up an analogue tuner sometime. I have the meter connected exactly as shown in the manual, but all readings are negative, not positive. Could the manual be in error about this?? **Swap the meter probes over. In the final analysis, it doesn't matter anyway. Just adjust for the correct absolute value. Positive or negative is unimportant. Trevor Wilson -- Posted via a free Usenet account from http://www.teranews.com |
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#6
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Setting idling current
In all praticality, if the polarity was really incorrect, the amp
would be having problems. If you do mess with the bias adjustments, make sure that there is no DC to the speaker outputs with no load. Also check that the DC voltage ballance is correct. Refer to the service manual for details. I am speaking genericaly here, and not model specific. The service manual should have the proper set-up info for your amp. Jerry G. --------- Ken123 wrote: Hi... I decided to check the idling current settings in a Denon AVR-3000. There is a complicated process involving connecting a meter of test points, adjusting intermediate voltage settings, then final settings of 3mv +/- .5mv after 10 minutes . I have the meter connected exactly as shown in the manual, but all readings are negative, not positive. Could the manual be in error about this?? Ken |
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#7
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Setting idling current
"Jerry G." wrote in message oups.com... In all praticality, if the polarity was really incorrect, the amp would be having problems. If you do mess with the bias adjustments, make sure that there is no DC to the speaker outputs with no load. Also check that the DC voltage ballance is correct. Refer to the service manual for details. I am speaking genericaly here, and not model specific. The service manual should have the proper set-up info for your amp. Jerry G. --------- I was pretty much thinking along the same lines. I'll just follow the instructions and ignore the minus sign. Thanks. Ken |
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