Technics RS-TR255 Cassette Decks
in [Repair]
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From: Arfa Daily on 18 Feb 2010 21:04 "William R. Walsh" <wm_walsh(a)hotmail.com> wrote in message news:4a0db9b3-639b-4155-86c7-35068c40d54c(a)y17g2000yqd.googlegroups.com... > Hi! > > If it's not engaging in the recording mode, have you checked to be > sure the record prevention safety switch is doing its job? > > There should be a small arm that senses whether or not the erase- > protection tabs have been removed from the cassette. If the switch or > optical sensor attached to this arm aren't working, the deck will > refuse to record on a tape. > > If it's a switch, you could try shorting across it temporarily and > attempting to engage the recording mode. For a full logic deck like > the one you have, you will need to have a tape in place for it to work > properly--otherwise the tape spill sensor may well shut it down if it > starts in the first place. (Most won't operate without a tape in > place.) > > William I think that he is more referring to the deck by function to identify which one he is talking about in case it makes a difference to the diagnosis, rather than talking about the problem being specifically record-associated. i.e. the unit has two decks, one of which is a record / play deck (the one the OP is referring to) and the other being play only. This is a common arrangement on dual deck machines, as there is no valid case for having both decks capable of recording. Arfa
From: Arfa Daily on 18 Feb 2010 21:15 "David Nebenzahl" <nobody(a)but.us.chickens> wrote in message news:4b7dcf5d$0$3261$822641b3(a)news.adtechcomputers.com... > On 2/18/2010 12:50 PM Puddin' Man spake thus: > >> There are a series of contacts just above the cassette. I cleaned >> them as best I could with alcohol and Q-tip: made no difference. > > I don't think those are contacts; those sound like the springs to hold the > cassette in. > > > -- > You were wrong, and I'm man enough to admit it. > > - a Usenet "apology" There usually are several sets of contacts, one of which is the cassette sense switch, the others being for sensing the record prevention tab (at left side), and auto tape-type detection (right centre). Are you sure that you actually got to the contacts ? These leaf switches normally have a clear plastic cover over them, and it is necessary to remove this to clean them successfully. This often involves withdrawing the pcb that they are soldered to. When you can genuinely get to the contacts, they are best cleaned by drawing a piece of paper soaked in switch cleaner through them, whilst keeping some tension squeezed on them. Another place that you might look is on the main body of the deck. I can't remember if Technics decks have this additional switch or not, but many decks do. It is another leaf switch, but usually an open type, and somewhat smaller than the cassette sense switches. It is operated by the top edge of the head plate pressing on it as the heads go fully in, to inform the system control micro that the loading sequence has completed. These switches often go intermittent like the sense switches, and again give the same symptom of the deck going through the loading sequence, then dropping back to neutral before the tape starts to transport. Arfa
From: Arfa Daily on 19 Feb 2010 21:02 <Meat Plow> wrote in message news:3hiriq.mrv.19.6(a)news.alt.net... > On Fri, 19 Feb 2010 02:04:27 -0000, "Arfa Daily" > <arfa.daily(a)ntlworld.com>wrote: > >> >>"William R. Walsh" <wm_walsh(a)hotmail.com> wrote in message >>news:4a0db9b3-639b-4155-86c7-35068c40d54c(a)y17g2000yqd.googlegroups.com... >>> Hi! >>> >>> If it's not engaging in the recording mode, have you checked to be >>> sure the record prevention safety switch is doing its job? >>> >>> There should be a small arm that senses whether or not the erase- >>> protection tabs have been removed from the cassette. If the switch or >>> optical sensor attached to this arm aren't working, the deck will >>> refuse to record on a tape. >>> >>> If it's a switch, you could try shorting across it temporarily and >>> attempting to engage the recording mode. For a full logic deck like >>> the one you have, you will need to have a tape in place for it to work >>> properly--otherwise the tape spill sensor may well shut it down if it >>> starts in the first place. (Most won't operate without a tape in >>> place.) >>> >>> William >> >>I think that he is more referring to the deck by function to identify >>which >>one he is talking about in case it makes a difference to the diagnosis, >>rather than talking about the problem being specifically >>record-associated. >> >>i.e. the unit has two decks, one of which is a record / play deck (the one >>the OP is referring to) and the other being play only. This is a common >>arrangement on dual deck machines, as there is no valid case for having >>both >>decks capable of recording. >> >>Arfa >> > > I own a pretty high end Sony dual and only deck B records. I don't > recall one that records on both like you mention there is no need. Quite so. Arfa
From: Puddin' Man on 27 Feb 2010 17:52
Much thanks for numerous responses. It looks like I'll have to attempt to dissemble a dysfunctional drive. Without schematic or other doc. Other bonfires have taken precedence. I dunno when I'll be able to get back to the "Lazarus-From-The-Dead" cassette project. :-) But your help was much appreciated, and, with luck, may yet provide the needed guidance. Cheers, P On Wed, 17 Feb 2010 12:14:08 -0600, Puddin' Man <puddingDOTman(a)gmail.com> wrote: > >This may well qualify as a "Lost Cause", but ... > >I have 2 dual decks per the subject line. On both, the record drive will >not spin a (good, tested) tape. Same tape works OK in the play-only >drive. > >On a workbench with the case open, I push button for play or record or >rewind (forward or backward), the machine appears to do a check for >end-of-tape, clicks, and stops. > >I disconnected a motor thinking it might be frozen: it was not. > >The behavior it exhibits is identical to what the device is supposed >to do when I, say, tell it to play a tape that is pre-positioned to >end-of-tape. I'm guessing that the problem is with the end-of-tape >sensor. > >I am neither expert nor helpless with electronics. > >Any hope for repairing such a beast? > > TIA, > Puddin' > >"Law Without Equity Is No Law At All. It Is A Form Of Jungle Rule." "Law Without Equity Is No Law At All. It Is A Form Of Jungle Rule." |