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 10 (click to view)
PV-GS250PP
5 HOW TO REPLACE THE LITHIUM BATTERY (PROCEDURE)
1. Remove the Side Case (L) C.B.A.. (Refer to Disassembly Procedures.) 2. Unsolder the Lithium Battery �ML920S/F9D� and then replace the new one. (See Fig. B1.) 3. Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type.
Fig. B1
Note: The lithium battery is a critical component. (Type No.: N9ZZ00000297.) It must never be subjected to excessive heat or discharge. It must therefore only be fitted in equipment designed specifically for its use. Replacement batteries must be of the same type and manufacture. They must be fitted in the same manner and location as the original battery, with the correct polarity contacts observed. Do not attempt to re-charge the old battery or re-use it for any other purpose. It should be disposed of in waste products destined for burial rather than incineration.