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Your problem is most likely one of three things: the zoom rocker (or wires connecting it to the main control) have gone bad, the zoom motor has failed, or you have bad capacitors in the camera which are causing the controls to not operate as they should. In any case, the camera will probably need servicing to restore it to complete function.
I have to say, yikes, since my camera has just recently has the same issue. It's a lense issue. The service men said a lense isnt something to joke around with or try to have just "anyone" to look at.
This isnt something you can just fix on your own. You need to notify the manufacturer regarding the OEM manufacturer of the lense.
Or, get their information on who to have inspect it.
Typically, its something broken, and very small that is articulate and impossible to fix on your own, otherwise there is something off with the focus on the lense..or its creating this issue.
Again, dont mess with it it will only make it worse when you hear that grinding sound, trust me..I messed with mine and made it worse then it could have been...
There is control switch block that has zoom/wide switch along with play, rewind, forward, stop, pause buttons and this switch block flip up and down while ejecting/ load tape in camcorder, this will be replaced as zoom/wide switch got defective and sending continues command of zoom to system control chip. Let me know if you need part number of switch block control for DCR-TRV120
This is for Sanyo VPC-HD1, VPC-HD1A black screen problem how to clean auto iris unit.First you have take apart camera : remove 4 screws from right side (in battery compartment) 2 screws from bottom, 2 screws from top (there are different short one is from rear) and last screw from front,
now pull left cabinet from top and take appart.Be carefull !!! there is flash capacitor you need to discharge it before doing anything else.You can discharge with 1Kom 5watt resistor .
After that remove 1 screw holding speaker, disconnect and remove speaker.Now pull power board PW-1
there is a screw holding lense ring remove that screw, disconnect 2 connectors from lense assy
(from ccd just pull, from lense unlock and pull flat cable now you can remove lens assy.
Next remove 3 small screws holding heat sink (rear of lens assy) after that remove spacer (black tape from top of lense and another small tape at rear top of lense. Now you can see 7 white screws and 1 black screw remove all of them.Black screw holding iris unit.Now carefully lift zoom motor focus motor 2 sensors nd filter assy and iris unit they came out all together.Next thing main thing you have to open iris unit it is easy to do with sharp blade on the edge of iris unit you will find 2 locks holding
metall casing of iris unit put blade between metal and plastic case and pry to remove metall case.
Now you will find iris 2 blades there are different you need to remember wich is wich.Now carefully remove both blades (they might stick to each other because of grease) and place them into isoprophyl alcohol after that put them on to napkin fold napkin so blades are inside and dry them
you also need to clean iris unit where blades are going from grease and also clean zoom motor and focus motor shafts to remove grease. Now put everything back together and i hope you can do that.
There are two components to a camera lense. One adjusts the final lense distance from the CCD imaging chip the other adjusts the distance between the lenses in the assembly (which zooms the image in and out). It sounds like something inside the lense came loose and when you zoom the lense the focal lense is moving with the rest. The lense will probably have to be replaced if it cannot be taken apart. Odds are something is broken inside anyway. This could be something you might be capable of, I have no way of knowing. If you do not think you are up to the task, have a reputable repair shop do it. Cost should not be excessive. I would think less than $100 US plus the cost of the part. Good luck.