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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
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Excellent printing quality.
A complete and very usefull service manual with all details.
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4096-00X
Paper Feed Service Check
If your machine does not have paper jam problems, continue with the service check. If your machine does have a paper jam problem, examine it for the following before you begin the service check:
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Check the entire paper path for obstructions. Be sure there is not too much paper in the sheet feeder. Be sure the correct type of paper is being used. Check for static in the paper.
FRU 1 System Board
Action Turn the printer on and verify the paper feed motor activates. Be sure the end-of-form sensor lever is in the down position. Turn the printer off and disconnect N7 from the system board. Check for motor pins shorted to the motor housing. If you find a shorted pin, replace the paper feed motor. If you still have a failure after replacing the paper feed motor, replace the system board. A noisy or chattering motor or a motor that fails to turn, can be caused by an open or short in the motor, an open or short in the motor driver on the system board, or a bind in the paper feed mechanism. With the paper feed motor cable N7 disconnected from the system board, check for 80 ohms (±7 ohms) between the following pins on the motor: Pin 1 to Pin 2, Pin 1 to Pin 4 160 ohms (±7 ohms) between pins 2 and 4. If the readings are incorrect, replace the paper feed motor and drive train assembly. Although the paper feeds in a forward direction only, the paper feed motor turns in two directions. If the paper feed motor turns in one direction only, replace the system board. Binds in the paper feed motor or gear train can cause intermittent false paper jam errors. Remove the paper feed motor and check the shaft for binds. Also check for loose or worn motor gear.
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Paper Feed Motor
2-8 Service Manual
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