Transport door stuck, suspect tape wound about capstan.
Tascam 202 Mk III in storage 5 years. L hand deck worked OK 1st time. R hand deck worked OK for several moments and then stopped. Deck door refused to open. I removed the cover to see if the door could be accessed from behind. I didn't want to attempt the work without a service manual. How difficult would it be with one? Ideas?
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Dual cassette deck are often poorly built and full of problem with age. They are typically not worth repair. Get a good deck like the Tascam 122 Mk II as these can be repairs.
I have consulted with clients that have dual decks and the cost to repair will get you a Tascam 122 Mk II in restored condition and it works much much better. I should know as I have been repairing decks for 40 years so far.
With this kind of mechanism you need to open the deck up and assist the cam wheel by hand to get the eject block and heads to go down to the stop mode. This is the only way to get a tape out without destruction to both tape and machine. I have done it a few times. If you can not do it yourself, I am in the Chicago area as Skywave Tape Deck Repair. I can get the tape out.
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.
That complexity of the unit can not be repaired remotely. It needs to go to a Technician that is capable. Teac people that are still in the business are Russ at New Jersey Factory Service and Skywave Tape Deck repair in Chicago area. I am the Skywave guy.
They have them at Consolidated Electronics but you need to order by size. They will not know what you are talking about with a model number- the job is best worked on by a Technician. I work on these on occasion.
Well which is it 122 mk III or the 238?
The grease in the 122 will harden with time and gear crack or lose teeth. The deck needs to be worked on. There is myself in Chicago,
Russ in New Jersey that are still working Teac Technicians. There is Adrian in CA but I am not sure he wants to work on cassette decks.
The problem is a lack of movement in the transport to tell the controller that it has completed it cycle. This is most of the time caused by the grease they used and sometimes a gear with broken teeth on it. These gears have been discontinued and I am having some made but it will take a few months to set up. I do have some in stock right now for repairs. The transport will need to be cleaned of old grease and new grease put into it. They also suffer from decaying capstan surface mount caps. These are replaced when I do the gear correction. After that they are good decks.
The Tascan 122 Mk III does not have a computer in it to give error codes. I suspect that you have a power supply issue but I can only help you if I see the unit. I am in the Chicago area and run a shop for fixing these decks. I have been doing it for 40 years and have worked at the Teac Factory Service in IL. firstname.lastname@example.org if you need my help. The symptoms are recognized as a cracked transport gear that is resolved by a new gear and a transport cleaning and new grease put in. I have done about 6 of them as this is described. I have parts in stock.
It is hard to guess what is causing this but for all of the gain to be reduced like that either the deck has seen some really high input signal in the past that blew out some amplifiers or that there is a power supply component that has taken the input electronics down. I suspect that you will need to have a Technician look at it. If you are near Chicago, I may be your answer, I have been working with these Teac units for 40 years and was a Lead Tech at Chicago Factory Service in Arlington Heights. I can be reached at email@example.com If you are far off- I have other people that can do the job one in New Jersey and a few others.
Ensure the rubber pinch roller presses the tape against the capstan drive shaft....ensure the capstan drive motor is turning..and the belt to the flywheel is snug, and not slipping. the tape transport engage relay might be stuck...a relay maybe corroded ...may need cleaning. Without seeing it cant say clearly what may be the problem. also ensure the tape tension/shut-off arm is under tension by tape that is correctly installed.