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 22 (click to view)
SOFTENER DOES NOT FLOW IN
Is water supplied?
NO YES
Refer to �NO WATER SUPPLY� Check the wiring on the dispenser.
Wiring diagram
Are receptacles correctly connected to the terminals of the INLET VALVE ASSEMBLY?
NO
YES
Is softener put in the correct compartment of the drawer?