Question about JVC DRMH20 DVD Recorder
Unit flashes 'loading' continually on power up. I have been led to believe that this is a power supply problem that can be fixed by changing a couple of caps on the power supply board and adding a resistor to prevent the problem re-occuring. Can anybody supply me with details of the modifications required?
Voltages on CN5303 should be 12V and 5V. I found 5V to be2,5....3V.Check input of regulator MM1665A(should be 6V). If 6V ok,remove connector CN5303 and check if 5V ok.If so,here is my way to fix this "loading" problem.(create a new regulated 5V circuit)
Replace C5206 with 1000uF/25V,C5306 with 100uF/25V,isolate anode of D5213 from transformer,
wire one and an half turn around transformer,connect one end to ground and the other to the anode of D5213,remove MM1665A and replace with 7805 on appropriated radiator.
Input on 7805 is around 11,8V reason why you need to install it on a radiator.
Posted on Oct 06, 2008
This is a well-documented fault. In the USA power lobbiests got JVC to recall the units and fix the problem. The fault is a small component that was wrongly specified - when it reaches a set 'maximum' temperature is fails and causes a protection shut down. Over time it fails to allow start up. It is worth finding your nearest JVC approved repairer (if it is out of warranty) and have the recorder repaired.
Here's the official help as in the good old USA -
A limited number of units of certain models of DVD recorders (Models-DR-MV1S, DR-M10S, DR-MH30S, DRMX1S, SR-MV30U) have experienced the symptoms described. While manually resetting the unit, as set forth in the question, restores normal operation, the symptoms may reappear. JVC has identified the cause of these symptoms and will make the necessary adjustments to affected units to eliminate the likelihood that the symptoms reappear. Adjustments will be made free of charge at JVC Factory Service Centers. Click the Factory Service Center link at top left of this page to obtain your nearest location. Please call 1-800-252-5722 and select option 4-3 if you have any questions regarding this process.
Presumably the UK JVC Centres will also carry out these free of charge ! NO SUCH LUCK! We are 'Rip-off' Britain - as always.
Here - for your further understanding - what happens in the UK:
Repairs to JVC products are carried out through the JVC dealer network. All JVC dealers are aware of the technical support that is available from the JVC Service and Engineering Division if required. Unfortunately JVC UK are unable to quote the repair rates for JVC independent service dealers. We recommend that you call these dealers in order that they can communicate their repair charges to you.
The JVC Service Centre in the DE postcode area is: Trade Services, Holbrook Rd, Belper. Tel: 01773 822073
Repair Dealer : Relliance, Babbington Lane, Derby. Tel: 01332 363488
JVC (U.K.) Ltd
Customer Service Dept.
Good luck - once it's fixed, keep the receipt and guarantee, just in case.
Posted on Jan 04, 2008
Throw it away and don't buy any more jvc ****, thats what i did.
Posted on Oct 11, 2008
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