Question about Panasonic DMR-E55 DVD Recorder
WHEN FIRST SWITCHED ON UNIT HAS SEVERAL ATTEMPTS TO INITIALISE, KEEPS GOING THROUGH SELF CHECK. THEN WHEN RECORDING KEEPS RESETTING ITSELF AND YOU HAVE TO SET RECORD AGAIN. EVERYTHING ELSE FUNCTIONS. AT NO TIME ARE ANY ERRORS REPORTED NEITHER IS UNIT RUNNING HOT.
Ver common fault with these. Please see one of my earlier solutions shown below...
This is a common problem with this particular model. I can tell you what the fault is but unless you feel confident in using a soldering iron, the repair is best left to someone who is.
Ok...the fault you describe is caused by failure of IC001. This is a voltage regulator on the power board. You can identify the regulator as it is fixed to along thin metal strip near the middle of the board. It gets very hot during normal operation and will fail after a couple of years. The metal strip offers very little heat dissipation so the regulator operate in excess of its limits and therefore fails.
You need to take the lid off, remove the board which is mounted on the right hand side of the unit and replace the faulty regulator.
To remove the board, remove the fixing screw above the power connector on the back of the recorder, then the 4 fixing screws that secure the board. Next carefully remove the multi-connector that connects the board to other circuitry and lift the board clear.
A new regulator type STRG 6353 and can be obtained from several online suppliers. The old regulator can be removed by unscrewing the fixing screw, cuttiing the 5 pins with wire cutters. Then using a soldering iron, carefully removing the residual pins from the printed board making sure the print is not damaged.
Use some heatsink compound on the back of the new component, this will help it to dissipate heat more easily, use an additional heatsink if you can, which will help to prolong the life of the new regulator, then tightly secure it in position before carefully soldering the 5 pins.
Check that you have soldered it correctly without any shorted pins or tracks and reassemble the unit. I have repaired dozens of these successfully with exactly this fault.
Mains voltages can be lethal so always remove the power plug before doing any work like this and be sure of your own ability. If you're not confident in tackiling this, get someone to do it. Whatever you do, don't ditch the unit for such an easy to fix fault!
From your user name, I guess you're a radio amateur, so you should be on home territory.........
Comment by Palmbeach, posted on Feb 14, 2008 By the way, I would avoid using the recorder until you have repaired it. If the regulator shorts out, it will take several other components with it. I repaired one where a couple of diodes fried and part of the print fused and burnt, together with an internal fuse which blew.
Posted on Apr 18, 2008
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