mitsubishi hs-412e no picture

[newzealand]

Originally Posted by Ed in Tx

Would not be surprised if the cause is a failed electrolytic capacitor. Those units used to have some cap failures and that was 20 years ago when people were paying to get them fixed. Sometimes it is obvious from looking at the circuit side of the board. The traces can get blackened around the solder connections from the electrolyte leaking out.

hi there
would you give me an idea of which board it would be? at a guess its the one that the wires form the head go to?
if i took a pic of the inside would that be an easier way to go?
i will any way
mike

[Ed in Tx]

Originally Posted by newzealand

hi there
would you give me an idea of which board it would be? at a guess its the one that the wires form the head go to?
if i took a pic of the inside would that be an easier way to go?
i will any way
mike

Yep probably the one with a shielded area where the head amp is. Unless that model has a separate head amp board behind the drum, some did. Keep in mind I haven't seen an HS-412UR (the US NTSC version) in probably 20 years. There could easily be a bad cap in the video or video muting circuit causing no video, black screen.

[newzealand]

Originally Posted by Ed in Tx

Yep probably the one with a shielded area where the head amp is. Unless that model has a separate head amp board behind the drum, some did. Keep in mind I haven't seen an HS-412UR (the US NTSC version) in probably 20 years. There could easily be a bad cap in the video or video muting circuit causing no video, black screen.

i have found the board that has head amp stamped on it,
is this the one i need to check?
i had a good look with a micro glass and can not find any signs of heat or failure,
ill do a few more checks and if nothing ill bin it
do you have any recommendations on what model to look for that are kind of reliable ?
i have tried a few sonys ,jvcs ,national, all were no good for long electronically,
im thinking of going euro as they have got to be better than these jap units ,
what do you think
mike

[Ed in Tx]

Originally Posted by newzealand

i have found the board that has head amp stamped on it,
is this the one i need to check?
i had a good look with a micro glass and can not find any signs of heat or failure,
ill do a few more checks and if nothing ill bin it
do you have any recommendations on what model to look for that are kind of reliable ?
i have tried a few sonys ,jvcs ,national, all were no good for long electronically,
im thinking of going euro as they have got to be better than these jap units ,
what do you think
mike

Bad caps don't always show visible signs of failure. You need an ESR meter to test them in-circuit. If you had an oscilloscope you could connect to the RF output test point of the head amp and see right away if it is working or not. I suspect something else down line in the video processing or muting circuits.

Far as a reliable VCR most are going to be old and loaded with electrolytic caps and rubber parts. Find a newer model that works. A "euro" VCR? Only one I knew about was the Grundig Video 2000, a failed format. Most all brands sold worldwide were Made in Japan (preferred) until they became cheap commodity items made in China.

[newzealand]

Originally Posted by Ed in Tx

Yep probably the one with a shielded area where the head amp is. Unless that model has a separate head amp board behind the drum, some did. Keep in mind I haven't seen an HS-412UR (the US NTSC version) in probably 20 years. There could easily be a bad cap in the video or video muting circuit causing no video, black screen.

well ,
i re fitted the board and now seems to have started to blow fuses ,so its now gone ,
i might just bin my movies to ,i have about 400 all up ,might be cost effective to burn them as rubbish costs here in nz
thanks to all of you who tried to help me
mike