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.
Text excerpt from page 10 (click to view)
ssembly of FPC(Flexible PC board) onto Roller ass'y
Turn Roller ass'y by 2 times. Hook the end of Roller ass'y to the tongue. Insert the FPC into the slit of Roller ass'y then release the end of Roller ass'y and the tongue.