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 105 (click to view)
Pin No. 22 23 24
Pin Name CTRL3
________
I/O I I �
______________
Description
______________
Controls whether or not to input the VSYNC signal to the SEPIN input. L: to input the
______________
VSYNC signal. H: not to input the VSYNC signal. RST VDD1 System reset input terminal. Pull-up resistor is built-in. (Hysteresis input). Power supply. (+5V digital power supply).