Audio Systems: amplifier ready light dosent com on, reverse polarity, blown fuse

Question
-------------------------
Followup To
Question -
kenwood stereo amplifier & receiver, model kr-v7060 approx. nine years old. ready light does not come on when plug cord into ac outlet. also the remote has been working irratically for some time prior to ready light problem. i've worked on electronic equipment in the past. can you give me some ideas as to what may be the cause of these problems? please advise.    thank you, jim (follow up question) tom, thank you for the quick reply. i found a loose wire which gave me back ac power. when i start up receiver and play a radio station, everything is fine as long as i don't make any changes but receiver freezes up if i make any kind of change ie: change stations, stereo to pro logic, turn off receiver etc.. i then have to unplug ac cord, wait a few minutes and plug ac cord back in to get it working again until i make another change. also i notice cooling fan on rear of receiver is not working. checked fan coil and it seems to be ok. checked fan feed and i'm getting a reverse polarity voltage (judgeing by fan wire colors) that reads about 2.5 volts dc but increases as the volume increases. also remote control still dosen't work but a friend checked it for me and said control is working fine. any help would be appreciated.    thank you, jim
Answer -
Jim,
If the standby light doesn't light up, the cause may be a blown fuse or the small standby transformer has an open primary due to some kind of surge. as for the remote control, in most cases if any buttons are slow or sticky, the key pad in the remote control may have dirty contacts. I have also found in these remotes, defective connections due to the remotes being dropped on the floor several times too many.


TOM,
T&D ELECTRONICS
tdeser@zoominternet.net  

Answer
Jim,
It sounds like the rcvr has a power feed problem. The 5 volt supply to the processor may be lower than normal possibly just enough voltage to make the rcvr work, however when you press any button the voltage will drop below a level that causes the processor to lock up. A good place to monitor this voltage will be on the pins of the remote control receiver module. You should measure about 5 to 5.3 volts DC. As for the cooling fan, it is controlled by the level of the audio output. The fan will only turn on when the volume is turned up to about the 9 oclock position.

TOM,
T&D ELECTRONICS
tdeser@zoominternet.net