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#1
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Studer Revox PR99 problem
I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? Thanks Joe
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#2
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Studer Revox PR99 problem
message ...
I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? There is a photo-cell on the left below the heads that detects if there is tape. If it does not "see" the tape it will disenage the transport. /Preben Friis |
#3
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Studer Revox PR99 problem
On Wed, 20 Mar 2013 08:23:19 +0100, "Preben Friis"
wrote: message ... I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? There is a photo-cell on the left below the heads that detects if there is tape. If it does not "see" the tape it will disenage the transport. /Preben Friis --Right. At Revox B77 / PR99, that arrangement works well but does have some quirks. Running the machine without head cover at strong light or sunlight shining directly on the sensor ie. phototransistor disengages the transport. Also running a thin, partially transparent, tape, does the same. I placed a tiny drop of black lacquer at the top of the IR LED, thus making it a kind of floodlight source; this solved the thin tape problem. Even taking a close-up photography with a flash of the tape-end sensor while the machine is on can reportedly blow the phototransistor and possibly the first transistor thereafter. Please check the service manual for PR99, Section 7/7. Place your finger over the sensor opening and run the machine. If it disengages while the opening is covered, then there is a fault. All the best, Edi Zubovic, Crikvenica, Croatia |
#4
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Studer Revox PR99 problem
wrote:
I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? Thanks Joe Is the shorting plug in the remote control unit jack? If the shorting plug is missing, this will happen. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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Studer Revox PR99 problem
On Tuesday, March 19, 2013 10:35:35 PM UTC-4, wrote: I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? Thanks Joe
Thanks to all that have posted. I already know its not the end of tape sensor and this model does not need a dummy plug in the remote socket as the A77s do |
#6
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Studer Revox PR99 problem
wrote:
Thanks to all that have posted. I already know its not the end of tape sens= or and this model does not need a dummy plug in the remote socket as the A7= 7s do If it's like the B77 it does... the PR-99 is a B77 that has been sort of upgraded for broadcast use, though, and it may not be. The switch assemblies on the B77 are prone to breaking, though... and since they are all one module they cannot be repaired per-se.... and they cannot be replaced since Revox no longer stocks them. I would check the switch panel and make sure the stop switch is good. If that's good, your next step is to start tracing with the voltmeter. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#7
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Studer Revox PR99 problem
On Wed, 20 Mar 2013 15:00:59 -0000, Scott Dorsey wrote:
wrote: Thanks to all that have posted. I already know its not the end of tape sens= or and this model does not need a dummy plug in the remote socket as the A7= 7s do If it's like the B77 it does... the PR-99 is a B77 that has been sort of upgraded for broadcast use, though, and it may not be. I've never seen a B77 that has needed a shorting plug in the remote socket. Mine certainly works without one - but it is a Mk2 so maybe the Mk1's needed one. It really sounds like there's something wrong with the photocell automatic stop circuitry. James. -- http://www.jrpmusic.net |
#8
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Studer Revox PR99 problem
miercuri, 20 martie 2013, 04:35:35 UTC+2, a scris:
I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? Thanks Joe check fader start pcb, capacitor c2-3.3uF blue tantalum possibly failed (in short circuit) |
#9
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Studer Revox PR99 problem
Check the date of the post to which you replied
Mark |
#10
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Studer Revox PR99 problem
On Monday, October 13, 2014 at 3:39:33 PM UTC-4, wrote:
miercuri, 20 martie 2013, 04:35:35 UTC+2, a scris: I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? Thanks Joe check fader start pcb, capacitor c2-3.3uF blue tantalum possibly failed (in short circuit) Correct capacitor for this fix is C4, shorts causes 24 volts to stop port. Same value 3.3/35volt capacitor. BR99 MKII version. |
#11
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Studer Revox PR99 problem
On Saturday, November 18, 2017 at 11:08:14 AM UTC-5, wrote:
On Monday, October 13, 2014 at 3:39:33 PM UTC-4, wrote: miercuri, 20 martie 2013, 04:35:35 UTC+2, a scris: I have a Studer Revox PR99 player only that I cant keep in play, rewind,fast forward mode unless I keep ho;ding that button down. As soon as I let the button go it stops. Any ideas where to look? Thanks Joe check fader start pcb, capacitor c2-3.3uF blue tantalum possibly failed (in short circuit) Correct capacitor for this fix is C4, shorts causes 24 volts to stop port. Same value 3.3/35volt capacitor. BR99 MKII version. I did, thought this might help someone else, likely not helpful to original requestor. |
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