Question about Sony UVW-1800P VCR

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No video but have audio

While in servo check mode top/end sensor's are off with no tape in unit. I have no experience with this unit and no manuals to consult any help would be greatly appreciated.

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  • carlv Jan 08, 2009

    It only shows UVW-1800 on back label. It has a numbe rwhich i guess to be s/n is 37668. I work at an Univ. and am looking at it to help out.

  • marc301 Apr 08, 2009

    I am having the same problem, I am getting an audio output but not a video output. I tried what the user manual suggested but still no picture.

  • Shahid Electronics
    Shahid Electronics May 11, 2010

    I hope you have related service manual of UVW-1800 VCR (professional series) It is not consumer or low-end model.
    Approx cost of new unit is $7 thousand and it calls betacam editor.




    Service manual will help you to diagnose problem through troubleshooting chart like what to check and hwre to go for double check etc.








  • Shahid Electronics
    Shahid Electronics May 11, 2010

    This Sony professional series VCR and need qualified tech to do the job.
    Let me know exact model to look for service manual.

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  • 221 Answers

With no tape in the unit, the tape top/end sensors will be "off".

Posted on Mar 16, 2009

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1 Answer

Hi Donald. not sure how many calls you get from


The fault seems to be in the sensor and the mode switch of the loading system which is connected with the main controller processor and loading driver.
This can be a failure of the tape end detector which is a IR - infra red- emitter which is placed in the center of the tape tray and MUST feed continuous signal to the END IR detectors placed at either ends.
Also the tape seems to load with a false detection of the cassette within when the tray is closed for this reason of the failure along with a possible misplaced mode switch settings. This triggers to make the loading move without a reason and so can be due to failure of the the mode switch or unbalanced settings.You will need some experience to remove the tray unit, then check on the IR sensors and also check the settings of the loading drive and mode switch.

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Blue Screen of Death


it plays dvd's audio and video? and not channels?

Nov 12, 2007 | Panasonic PV-DF2035 20 in. TV/VCR/DVD...

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A video tape got stuck in the vcr then.


Well to get it out the vcr would have to be taken apart by someone that fixes vcr's and dvd players then for them to get it out. Or try and un plug it for 10 minutes to see if it fixes the issue if not it will need to be repairded. DOn't take it apart your self it might damage the vcr then.

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1 Answer

Panasonic vcr nv-hd650 stuck tape in machine


This can be due to many faults and need a full check up but I can fill up with few tips.
1. If the cassette loads and the take up spool does not turn then the machine will shut and rewind.
2. If the take up spool rotates but then it shuts down then the reel sensor at the bottom of the forward wheel can be faulty- there are opto devices or proximity sensors/magnetic type.
3. If the drum does not rotate it will shut down as well a fault in the SERVO section.
4. Defective HALL IC can shut the switching and so the servo will shut down the processor.
5. Fault in the power section to deliver the correct voltage to the circuits/loading servo to take up.
6. Finally if the loading is not to the MODE switch point or failure of mode can make the loading to trip as it will not complete the load to the desired point.

All the above issues can stall the loading of the tape and so will be seen as struck inside. Sometimes mechanically/manually removing by unwinding the motor can release a jamming and restore.

Jul 26, 2011 | Televison & Video

2 Answers

VCR not working--initially accepts a tape--can hear it set up to head but releases after a few seconds. No fast fwd, no rewind.


This canbe due to many faults and need a full check up but I can fill up with few tips.
1. if the cassette loads and the take up spool does not turn then the machine will shut and rewind.
2. If the take up spool rotates but then it shuts down then the reel sensor at the bottom of the forward wheel can be faulty- there are opto devices or proximity sensors/magnetic type.
3. If the drum does not rotate it will shut down as well a fault in the SERVO section.
4. Defective HALL IC can shut the switching and so the servo will shut down the processor.
5. fault in the power section to deliver the correct voltage to the circuits/loading servo to take up.
6. Finally if the loading is not to the MODE swittch point or failure of mode can make the loading to trip back to rest.
Hope you are able to check these tips.

Jul 20, 2011 | Sansui VRDVD4000 DVD Player/VCR

1 Answer

Unit keeps going in safegard mode


Possible that there is errors due to many reasons but the most possible can be:

A faulty drum servo - failure of drive or hall IC
A faulty capstan drive.
A struck up loading mechanism
Failure of the dew sensors, end sensors.
Shorting or high current drain in circuits.

Oct 11, 2010 | JVC GR-D750 Mini DV Digital Camcorder

1 Answer

My Panasonic NV-SD250 VCR displays FO4 message. The unit refuses to eject tapes.


Possible fault with the failure of the servo system, the mechanism , front loading and forward loading or the failure of the drum servo/capstan servo.
You can remove the front panel and top panel and remove up the loading mechanism by unscrewing the mounting. carefully disconnect the cylinder head strips, the audio connections and remove. manually turn to unload off the tape. then check for belt failure or visible errors. Now set back use a dummy cap to cover the end sensor emitter at the centre and manually push the loading mechanism assisting . If there is no loading the capstan is faulty, if it loads and the drums does not work it is tthe cylinder servo.
You will need some knowledge of the circuits to proceed to the correct fault.

Sep 01, 2010 | Panasonic Televison & Video

2 Answers

I recently purchased this from a pawn shop. I tried playing back a few of my old tapes and the video and audio is choppy. Is it the camcorder, settings or tapes?


It is possible that the camcorder was off use and resulted in drop of values in the servo sections. First of all open the tape door section and do a good cleaning of the audio/control head . See if any dirt had accumulatted onthe heads, be verry careful to clean or use a good quality cleaning tape. Check and see if your old tapes are tight , rewind and forward before playing stored tapes. If this wont solve the choppy playing, thenit is possible that the servo section of the camcorder needs attention. Get help if not familiar as it needs experience to open and probe, but this can also be very expensive. Hope you try the cleaning first. Good day

Aug 06, 2010 | Sony Handycam DCR-TRV103 Digital Camcorder

1 Answer

Is the top and end sensor supposed to be off in servo check mode


If the tape is inside, both sensor should be OFF because both are photo diodes and will ON when receive Light.
Tape inside covers both sensors, so no light, no ON signal.

Nov 10, 2008 | Sony UVW-1800P VCR

1 Answer

Dispays End Of Tape/Eject symbol


The tape end sensor, or record sensor has a fault, or the electronics that reads the sensors has a fault. This could be dirt on them, or an actual failure of some type. Without dissassembly and proper troubleshooting, speculation would only be a guess.

The service diagnostics do not show every possible type of failure that can occur in the camera. It only shows the main areas.

Jerry G.

Jan 07, 2008 | Sony Handycam CCD-TRV318 Camcorder

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