Question about Panasonic DMR-E55 DVD Recorder
After replacing IC001 machine functions perfectly (using temporary cooling)
Circuit Info required re source of 7.5 fan supply.
Palmbeach has the correct diagnosis. The heat sink fitted to the IC001 is not adequate. I have removed screw and fitted an additional heat sink to the FRONT of the IC. The original heat sink is fitted to the BACK. Put a spot of thermal compound on the front and back of the IC.The additional heat sink is made from a piece of aluminium strip 30 mm wide and cut to 65mm (or there abouts) long. Cut two slots to clear the original heat sink where it is bent round at either end. The strip is 2.5 mm thick. Remove the self tapping screw and replace with a longer machine cut screw and a nut. This allows you to get the correct tightness. You will have to drill out the hole in the present heat sink slightly so be very careful.
When testing the repair put the cover back on so that you get the correct air flow from the front of the case out through the fan.
As Palmbeach has said the fan is thermostatically switched and does not run all of the time. This mod can be done with the minimum of change to the original. About 20 minute task if you have the tools. Thank you Palmbeach
Posted on Feb 06, 2008
I agree with Palmbeach - The PSU board contains a number of Thermistors which are devices that change their resistance with temperature, therefore when the unit gets warm enough to warrant the use of the fan it will power up !...Revieski
Posted on Jan 09, 2008
Further to my first posting, my brother has the previous modele recorder his fan comes on as soon as the unit is switched on I was assuming the later model would do the same, can anyone confirm this ?
Posted on Dec 26, 2007
Before pulling out components, take into consideration that the fan does not necessarily operate as soon as the unit is powered. It should operate when the unit has been switched on for a while. Regarding IC001, I have long felt that this component should be bolted to a proper heatsink and fixed to the inside of the cabinet with a suitable insulator. DO NOT DO THIS WITHOUT A SUITABLE INSULATOR. The cabinet would make reasonable heatsink and IC001 would only get marginly warm.
Posted on Dec 26, 2007
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