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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Text excerpt from page 4 (click to view)
2. SERVICE MODE
Service Mode 1. While Mains cord is disconnected, press DISPLAY Button on the unit and plug in the Mains cord. 2. Version number of the front micom software is displayed. 3. Turn JOG dial to either direction then Display segment test begins. 4. First all the segments will light and then a segment turns off one by one. 5. Disconnect Mains cord to quit service mode.
Emargency Eject
1. Remove 5 screws on the top cover and remove the top cover. 2. Remove 4 screws on the bottom. (Pointed with the arrows in the picture above.)
3. Disconnect the flexible wire. 4. Remove the MD mechanism component from the unit and remove the 4 screws on the both sides. (Pointed with the arrows in the picture above.)
5. Slide the lever pointed with the arrow to the direction of the arrow.
6. Slide the pin pointed with the arrow to the direction of the arrow.