Panasonic DMR-E85H

Self Check / Overheating Problem.    
 



After great service for it's guarantee period plus 2 weeks......

THE SYMPTOMS......

During a "High Speed" HDD to DVD Dub, The machine
switched off and went into "Self Check" mode about ten times. 

After this, whenever waking from "off" or "external link",
it would "Self Check" at least 5 times. Sometimes for ten minutes.

After reading many forums, the problem was revealed to be one small component,
a voltage regulator IC on the Power supply curcuit board.
When using both drives at high speed, it overheats and then the "Self Check" fails. 

Here are a set of pictures and instructions for how to replace it.
If you can take a few cross-head screws out, solder reasonably carefully
and aren't too clumsy, it's a couple of hours well spent.

Details of where to obtain the part / serial numbers are at the bottom of the page.

My machine now works pefectly again. About £12.00 all in.

I take no responsibility if you bugger up your machine though.

(All these images can be enlarged by clicking on them).

Here goes......

LOCATING THE COMPONENT.

Remove the 2 silver screws from the sides and three black screws from the rear.
Slide the top cover backwards and then upwards to remove it.

   

At this stage, to make things easier, you can remove the front panel.
there are 3 clips underneath and one on each side. lift the clips just enough
to allow you to slide them over the lugs. It is better removed at a later stage but the
circuit board is a little more difficult to access. I left mine in place until the last
minute to protect the display on the front of the recorder.



The circuit board we need to access is below the Hard drive, (HDD).
It's cover is secured with 3 screws, one each side and a further one
which also holds the data ribbon in place. Remove these......

        

And place the cover somewhere safe.



Remove this screw which holds in place a plastic shield.
Make a note of exactly where it is located.

 

Carefully disconnect the HDD power supply and data cables.

 

The Hard Drive and its soft surround can now be lfted clear to
reveal it's mounting plate. Remove it's 5 securing screws. The one at
the front is difficult to access if you have left the front panel on.

       

The circuit board is connected to the rest of the machine with an unusual
connector. Carefully ease the locking tab slightly open and Very Carefully,
lift each end a little at a time until it releases.

 

Remove the screw from the rear of the machine which is just above the AC inlet.
Remove the 5 screws that hold down the circuit board. 
The circuit board can now be removed.
NOW is the best time to remove the front face from the recorder.

 

Here is the component which is at fault.
The heat sink is inadequate and the circuit board
shows evidence of overheating.

 

THE REPAIR.

Remove the securing screw then cut the legs to remove the component.
If you attempt to remove it by de-soldering all 5 legs at the same time,
you will have problems. The heat involved will also de-solder some very small
surface mounted components so, ......chop the legs off then carefully de-solder
one leg at a time.



Again, working carefully and with the minimum amount of heatng time,
prepare the holes by tinning them. the IC comes with pre-tinned legs to make your task easier.

I applied a little thermal compound (The type used for CPUs)
to the rear of the IC to assist in cooling. Insert the legs into the Circuit board
and screw it to the heatsink. Tight, but remembering it is plastic.

 

The legs are soldered individually to prevent too much heating
of the surrounding components. There is no need to trim the ends
as there is plenty of clearence when the Circuit board is in position.

 

If you haven't already done so, the front panel must now
be removed to allow you to replace the PCB.

  

REASSEMBLY.

Slide the PCB back into position.
Screw it down.
Insert the black connector.
Replace the small, black screw just above the AC inlet.

 

Replace the cover and screw it down.



Replace the HDD in it's foam surround and re-connect
the power and data cables.

 

Replace the top cover and the small plastic shield.



Clip the front of the machine back on.
Slide the top case into position and secure with
the 2 side screws and 3 rear screws.

JOB DONE.

OK, If you feel you can tackle this......
The component is a:-
SANKEN STR-G6353 IC

        

It is available from      HERE