mitsubishi hs-412e no picture

[newzealand]

hi all
i have found one of these players, its in great cond and i have replaced the belts,
all mechanical operations are working well ,
however im not sure how to get a picture from the unit,im using the yellow video out rca along with the red and white stereo out puts for the sound,
i get the sound no problems,
i have no experience with vcr hook up,is there a setting that changes picture output from the ariel to the video rca plug?
or a button that needs to be pushed to get picture ? i guessed that since the sound is good it should produce a picture?

has any one seen one of these units or worked on one? its very heavy and seems to be solidly made ,
it looks like a 80s unit,
im so excited about getting it going and watching my video collection thats been sitting about for years
any input would be helpful
mike

[Electronic M]

The RCA output jacks on any working VCR should always put out audio and video...only the RF output can be turned on and off.

If the RCA video output is dead, try the RF, if the RF is also dead try connecting the AV or RF output from a DVD player (or similar signal source) to the input of the VCR and see if you can get that to pass through the VCR. If the VCR will pass an external video signal through but not give video signal with tape than the video heads are dirty or dead, or the video circuits in the VCR are dead (only the first problem is easy to fix).

[newzealand]

Originally Posted by Electronic M

The RCA output jacks on any working VCR should always put out audio and video...only the RF output can be turned on and off.

If the RCA video output is dead, try the RF, if the RF is also dead try connecting the AV or RF output from a DVD player (or similar signal source) to the input of the VCR and see if you can get that to pass through the VCR. If the VCR will pass an external video signal through but not give video signal with tape than the video heads are dirty or dead, or the video circuits in the VCR are dead (only the first problem is easy to fix).

ok ill try these things and see what happens ,thanks for your in put
mike

[newzealand]

Originally Posted by Electronic M

The RCA output jacks on any working VCR should always put out audio and video...only the RF output can be turned on and off.

If the RCA video output is dead, try the RF, if the RF is also dead try connecting the AV or RF output from a DVD player (or similar signal source) to the input of the VCR and see if you can get that to pass through the VCR. If the VCR will pass an external video signal through but not give video signal with tape than the video heads are dirty or dead, or the video circuits in the VCR are dead (only the first problem is easy to fix).

ill try to get a pic of model and its inside soon

[newzealand]

Originally Posted by Electronic M

The RCA output jacks on any working VCR should always put out audio and video...only the RF output can be turned on and off.

If the RCA video output is dead, try the RF, if the RF is also dead try connecting the AV or RF output from a DVD player (or similar signal source) to the input of the VCR and see if you can get that to pass through the VCR. If the VCR will pass an external video signal through but not give video signal with tape than the video heads are dirty or dead, or the video circuits in the VCR are dead (only the first problem is easy to fix).

ok i have tried what i can and found it is not out putting a signal,
the heads look good ,its not out putting any thing at all so i checked for a bad plug or solder joint and they seem good,
i dont have a dvd player to try for the input but i only want to play tapes so that i think is not to important ,

well ill just dump this (another) player and find another i guess,i really had hoped this one was going to work after the belts were changed ,
mechanically this machine was working very well after a lube and belts,
oh well in the rubbish it is
ill contact you all once i find another ,they are getting hard to find in this area of the world and good reason it seems ,
this is the 6th one that has ether come to me not going or stopped working shortly after getting it,
ill try once more to get a vcr i think and if no go ill just dump all the tapes i have and try to get the movies on dvd
thanks for your input on all my threads
mike

[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.

[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

[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

[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.

[Electronic M]

You can get cheap ~$15 ESR testers on ebay that also do RLC tests and diode and transistor tests...I only go to that effort on decks I really care about.
3-7 years ago the thrift stores here were absolutely full of VCRs (probably 30 on the electronics shelves any given day in any one store) and I skimmed the cream. I've got probably around a dozen S-VHS decks and I prefer working on vacuum tube based electronics so I only bother with decks I consider special/worth my time...
If VCRs are hard to get in your part of the world then they probably merit more in depth repair attempts than what I typically bother with.

[newzealand]

well i found a player that will do for ow as this one appears to run,it is not a stereo model which is a shame as it would be a perfect unit for me if it had been, its in as new cond cosmetically,
i like the look of the flip door sonys but this is a fairly smart looker ,
the make and model is panasonic nv-d48
has any one used one before? i have only tested it very briefly, im guessing befor it goes in to service ill need to do some maintenance, dose this model have any problems that might be best to sort out before some thing breaks in service,cogs breaking and the like?
mike