Question about Panasonic AG-DS555 S-VHS VCR

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Seems like TBC won't lock, blue cast, picture unstable, weird colors, no contrast

I just got this deck and I love it. I'm a ham guy/computer tech., have solder station, can perform surgery.
You mentioned replacing all the caps on the vid boards. Before I do this, I notice lots of internal trim pots. Is it possible the unit needs a tune-up? Seems to get more stable after warmed up -- jog/shuttling back and forth will eventually get it to lock on. Does it playing tape as well as video in, so I'm convinced it's in the output somewhere -- TBC, video out. This deck won't let you turn the TBC off? Tried the setup procedure from the user manual for the TBC. Any help appreciated. Sounds like you really know your stuff. Actually, mine is the AG-DS550. Cheers, Duncan McAllister

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  • Anonymous Nov 26, 2008

    I have DS555 and it's not recording properly: slightly shaky picture.

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Change in stability after warm-up is a sign of defective capacitors. the DS550 and DS850 both are notorious for capacitor failures. don't touch the trim pots unless you have a service manual and a wfm/vectorscope.

Posted on Nov 24, 2008

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I have a video Panasonic AG-1980. Defect: When I am assisting a cassette and the key this TBC in off the image is normal and the color also. I slide the control soft-sharp and the silent image according to...


these decks are notorious for bad surface mount capacitors in the video and servo circuits. there will be quite a few that will need to be replaced. if you cant do it yourself, it will probably cost too much to repair. you will need access to an esr meter (pasive capacitor checker that checks the capacitor in circuit and the part does not have to be removed), a good soldering iron with a small tip, flux, thin solder, hemostats,solderwick blue and patients. the capacitors in question are the little round silver capacitors soldered directly to the boards. test all caps and locate caps with bad readings and mark them as bad but dont cover up the value marked on the top.the voltage is listed as a letter followed by the series of cap.(eg: 16 jhb would be a 16 mfd, j voltage rating, hb series cap) you can buy these caps cheap from digikey online. you need to be very careful when replacing the caps as if you do it wrong you will pull a trace and have to do major jumper wire work to replace the broken trace. the key to removing the bad cap is to grab them with the hemostats and squeeze, once the hemostats have a good grip of the cap start spinning the cap, dont pull just spin.you are trying to break the leads. once they break take your hot iron and wipe off what is left of the cap leads, let it cool and go back and remove remaining solder with the solderwick. clean the spot on board where cap was with anhydrous alcohol to clean any fluid that leaked out of the cap and made it bad. gently grab replacement cap with hemostats so you can hold it and apply flux to bottom of leads, place cap in its place watching polarity( black line on cap is negative and lines up with solid white side of silksceen on board or opposite the little plus on the board, if there is not a line on the cap or if there is a small "n" on the board it is a non polarized cap and direction does not matter)put a small(SMALL)amount of solder on your iron and touch it to the remaining exposed lead. if you fluxed enough and you used the correct amount of solder it should jump to the lead and leave a small shiny round solder joint. practice makes perfect and this will fix your problem. you may have to replace 40 to 50 caps maybe more, depends on how many are bad. good luck with your repair, 1980's were good decks!

Aug 20, 2011 | Panasonic AG-1980 S-VHS VCR

1 Answer

Was looking to buy one, and before the seller


the tape deck has jumped timing and can cost 40 to 100 dollars depending on how quick it takes the tech

Jan 05, 2010 | Panasonic AG-1980 S-VHS VCR

1 Answer

Unit will not reject tape stuck inside


If you are handy. Unplug the VCR from the power outlet and remove the top. You may be able to see what the tape is caught around and maybe using a tweezers remove the tape to get it up out of it's elevator.
May be a good idea to have the deck cleaned after this a clogged or shinny pinch roller is the culprit for this type of problem.
A/V Media Tech Guy.

Nov 23, 2009 | VCRs

1 Answer

Digitized picture playing out from Panasonic AJ-D230H


There are several PCB's in the DVC:

Input TBC
Video IO
Audio
Mechanical \ IF
Digital Core
RF
AVSYSCON
backplane

all of these boards have lots of, electrolytic can, surface mount capacitors:
upon researching the MFG specifications of the caps used by Panasonic, i found that they have a lifetime use rating in hours at a given temperature..

3000 hours of use at 100 deg c

these caps dry up and the power supplys get noisy and the caps that are employed in time constant circuit applications function out of spec ( if at all )

For about 3 months have been refurbinshing units successfully by replacing all of these caps

panasonic makes all of thes caps available as a service part kit

however the pcb's are very deleicate

I am only successful because I have 15 years of electronics engineering ecperience..

there is a tool call a Capacitor ERS analyzer ( Equivalt Series Resistance )
a good cap will measure .25 to 2 ohms and anything above 5 ohms is stale

I am getting set up in a new building for serviceing 230's and 255's at first and then i'll expand
I use a electronics assembly house to do the replacment of alll of the cap that go stale.

I have put together caps lists and digikey part #'s and generated my own re-capping kit that is much cheaper that the kit offered bt panasonic.

if you are interested in my services I am Ed
artiedc@yahoo.com

Mar 26, 2009 | Panasonic AJ-D230H DV/Mini DV VCR

1 Answer

Monitor and recorded picture out of sync.


It sounds like the sync pulse is not being recorded properly. I don't see too many PAL decks here in the Us, so I'll have to research this a bit. One thing you can try though, is to play back a previously recorded betacam tape and report the results. We need to determine whether the problem is in the record or playback circuitry.

Thanks,
Dan

Mar 19, 2009 | Sony VCRs

2 Answers

Sony VO 9800 Chroma Output


There is a converter called the YCP-688 that did exactly this-- converted the Y/C 688 signal coming out of the Umatic deck to a Y/C 358 signal that any modern device with a s-video port (VCR, edit deck, capture card) could accept.
The company went out of business in 2007 , don't know if they are still for sale-- here's a link to it-
http://www.smithav.com/ycplus/docs/688.pdf

Nov 17, 2008 | Sony VO-9800 VCR

1 Answer

Any idea how to setup and allign the internal switches of tbc boards in br-s822


JVC still hass the manual for this machine; call them and ask to buy one.

Apr 30, 2007 | JVC BR-S822DXU VHS/S-VHS playback VCR

3 Answers

No colour at playback when tbe switch is on


The DNR boards for these machines can go bad and produce a black and white picture. Try swapping the DNR board.

Apr 30, 2007 | JVC BR-S822DXU VHS/S-VHS playback VCR

1 Answer

DV input to DV deck


it is a matte of TBC lack your editter don't produce tbc signals with the video out you need to install a tbc board while your old panasonic has built in tbc board regards please don't forget to rate ,thx

Mar 05, 2007 | Sony DHR-1000 DVHS VCR

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