Question about Sony BM-850T Desktop Cassette Transcriber / Recorder

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Speed control no longer works when tape speed is on 1.2. Is this possible to fix myself?

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It will be hard unless you have a some Electronics background
there is a Servo motor with a control unit one of the parts could be burned or a relay

Posted on Oct 12, 2010

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I have a Tascam 688 mini studio, its 8 tracks on a cassette tape, I have just replaced the capstan belt and now the tape speed is way too fast even when I'm in variable mode with the speed turned all the...


It is possible the control transistor in the capstan motor has shorted due to age. There is a control in the deck for calibration of speed but then you need equipment and a MXT111 test tape to set the speed. So you may need a new Capstan motor or maybe just an adjustment- hard to say exactly without me looking at it- yes, I still fix them. I have been doing them for about 45 years and I worked at Teac as a Lead Tech in Arlington Heights IL.

Mar 13, 2015 | Tascam Audio Players & Recorders

1 Answer

Marantz Cassette Deck Plays Tapes Slightly Too Fast


The speed should be adjustable but the common practice is to use a frequency counter and test tape or test tape and wow and flutter meter. I look at this from a Technician's point of view as I have been fixing units for 45 years so far. Once the motor speed control is found it does not take too long. Sometime it take more time taking the cover off.

Jan 31, 2014 | Marantz Audio Players & Recorders

1 Answer

My sony cfs-w360boombox plays tape at high speed upon play, normal or high speed poition


there may be 2 possibles

1, the pinch roller is not going down and staying in the fixed when during playback, easy way to check power down the unit, press play and see if it looks firm, it will push back, if working right

if its loose, it may well have come off a little sping, and may well be an easy ish fix, by someone who know about cassette decks,

2, the speed adjustment has failed, there will be an internal speed control, which keeps the playback at a correct speed, if this has failed it may be fixable, but only by someone who can take it to bits and remove and solder a new one in, and they are very small and Sony items i have had have failed on speed control! too for me its a junker box

good luck

Sep 24, 2013 | Sony Boom Box With CD Player & Cassette...

1 Answer

I have a pear 6980, and it works just high speed and you can control the speed I wanted to know what can I do if I can fix it myself


The variable speed function is controlled by the switch. On rare occasions you can remove the switch, spray it with electronics cleaner and blow it out well to get it to work again. Usually you have to replace the switch. The switch for your impact driver is Makita part number 638326-6 and runs about $65.

Jun 06, 2012 | Makita 6980FDWDE 12V Cordless Impact...

1 Answer

I bought a used Cybex Trotter 700 T treadmill that works fine except the increase speed (+) does not work. I tried to fix it and now all of the buttons don't work. Any sugestions?


Dear Sir:
This is probably a 1(faulty speed sensor or the 2( speed sensor is not plugged in properly. Its also possibly a 3(faulty motor control board or lower board+ 4( Main motor faulty. Adjust the speed sensor see the diagram.

Run the software calibration for easy diagnose and troubleshooting.

See my personal TIPS for HELP

sincerley. God bless you.

ernesto cuadra
managua, nicaragua.
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Mar 10, 2012 | Exercise & Fitness

2 Answers

Comes up err when u turn it on in the speed window, and wont even move


Adjust the Speed Sensor:1)Make sure the sensor Speed is as close as possible to the pulley withouttouching it. You will see a magneton the face of the pulley; 2)make sure the sensor is aligned with themagnet. There is a screw thatholds the sensor in place that needs to be loosened to adjust thesensor. Re-tighten the screw whenfinished.sincerely.E.CUADRAMANAGUA,NICARAGUA.C.A

Nov 23, 2011 | York Barbell Home Use Fold-Up Treadmill

1 Answer

I purchased a varible speed controler to use on my 1/2 hp AC electric motor. I sure now that a got the wrong type (dc) not an AC type. It blow the fuse in the speed contol and made the motor buzz; wrong...


most drill presses use a capacitor start motor with internal switching . a variable speed control will not work most rely on step pulleys for speed control. possibly you could have blown your capacitor

Feb 08, 2011 | Craftsman Drills

1 Answer

Panasonic VHS VCR Playback mode Tape Stuttering between LP and SP


This is most because the control head may be dirty, this haed picks up the pulses from the tape to regulate the speed & tracking if this is off it can produce both the faults you describe. Also it is possible the pinch roller (black roller on the right hand side of the deck mechanism, sits just in front of the control head), this may be worn especially as the machine is five years old, this will cause the tape to guided off alignment.

Jun 15, 2009 | Panasonic Televison & Video

1 Answer

Speed


I assume by "last longer" you mean more record/play time.  The slp mode is the slower tape speed, which means longer record/play time.  The trade-off with the slower speed is poorer video quality.

As regards tape life, if this is what you mean- I don't know- tape life is often a matter of the quality of the tape itself. 

Oct 14, 2007 | Sanyo VWM-800 VHS VCR

5 Answers

Cassette Player


Motor speed needs to be regulated by PWM. Reducing the current (with a resistor) actually lowers the torque - which, with a given load, does result in reduced speed - however, different length tapes (60min vs 90min), as well as different quality, and even current position in the tape, will change the load and hence the speed. You need to regulate the speed via PWM. It's sometimes done on a small board built into the motor, in which case you'd have a round hole into which you could insert an INSULATED screwdriver (tiny flathead wrapped most of the way in electrical tape works). It may be done on the main board, in which case you could find a pot conveniently labeled "motor speed", or perhaps "pulse width" or "pwm" or something to that effect. Find it, mark its current position just in case, and turn it to see if it gets the effect you're after. And there are some tape decks in the world with no speed adjust - they are designed with a specific speed motor and the sizes of the wheels and gears are calculated for that speed. Also there may be a mechanical fault/malfunction causing the speed problem. An initial check and thorough cleaning of the capstan and pinch roller should be done. If there is a buildup of tape oxide or a piece of a broken tape wrapped around the capstan, the tape travel will be too fast (do to the effective increase in capstan shaft diameter). If the pinch roller isn't fully engaging, the tape can be getting pulled onto the takeup spool at a speed faster than the capstan control. A different source of trouble might be a slip clutch (possibly an idler/clutch assembly)which is binding, or otherwise not functioning the way it should. Another type of motor doesn't have it's speed controlled by an internal or external voltage.. instead, the motor has an internal centrifugal speed controller. This type of motor can be found on older tape decks, and might not have been utilized more recently. Good luck

Mar 07, 2006 | GPX HMTU3234 Shelf System

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