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denon avr 1602 getting into standby mode after 10 minutes

 
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dk
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PostPosted: Fri Sep 18, 2009 3:37 pm    Post subject: denon avr 1602 getting into standby mode after 10 minutes Reply with quote

Hi My denon avr 1602 is getting into standby mode after 10 -15 minutes of operation. i have removed the wires of speakers and its getting in a standby mode after 15 minutes. Have also tried to replace Resistors 141 etc. but with no luck. Please help...
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Justmanuals



Joined: 21 Aug 2004
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PostPosted: Fri Sep 18, 2009 3:40 pm    Post subject: Reply with quote

This Service & Schematic manual can now be purchased for $10.77 and downloaded immediately after payment from http://www.justmanuals.com


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PostPosted: Fri Sep 18, 2009 3:55 pm    Post subject: Reply with quote

thanks..i have the manual but i am looking at a solution
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sat Sep 19, 2009 3:15 am    Post subject: Reply with quote

Short of having a bad solder connection issue, you need to try to figure out if the shut down is because of going in to protection mode OR perhaps loosing a supply voltage? Start with monitoring the shut down detect pin on main microprocessor IC201 pin 64 and see if there is any change if/when the unit shuts off. Also, if you have a problem with any of the fixed voltage regulators, it can trigger a shut down. Seems like I vaguely remember something about either one of the regulators on the heatsink IC101 or IC102? --too many possibilities without further testing.
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PostPosted: Sat Sep 19, 2009 4:03 pm    Post subject: Reply with quote

thanks vtech for responding. let me check it and i will revert
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PostPosted: Fri Sep 25, 2009 4:34 am    Post subject: Reply with quote

Dear Vtech,
The System is going into protect mode. The problem is that voltage is dropping to 2 Volt in D135 after 15 minutes and the system goes in protect mode. if that is removed the system swiches on

so the problem is that When the system is switched on shows an input voltage of 5V but in 15 mins slowly it reduces to 2 Volt and then the AVR goes into protect/standby mode
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sat Sep 26, 2009 3:34 am    Post subject: Reply with quote

Be careful not to defeat the protection with speakers hooked up to prevent cooking them. As a matter of fact it is best to unhook your speakers as a precaution. Now that you know it is the protect sense line causing the shut down, need to check and see if it is a genuine fault and the circuit doing it's job or may be there is some sort of a malfunction within the protection circuit.
As you can see there are several modes of monitoring. Various protection control transistors tied to the same protection line, each monitoring a different mode that can pull down the 5V on yellow line, including the end from the red arrow. Key is to monitor and find which line(if any) might be the offending one. Generally, you can monitor the base of each transistor to see if there is any commanding signal.
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