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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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Ad justment part 3.H-CENT
Description 13. Receive a c ircle pattern s ignal. 14. Select 3.H-CENT and set the initial setting value. 15. Adjust H-CENT to make C=D. 16. Press the MENU/OK key and memorize the set value.
Ad justment of Signal H. CENTER gener ator Remote control unit
Ad justment of H.SIZE
17. Receive a cross-hatch signal. 18. Select 4.H-SIZE and set the initial setting value. 19. Adjust H-SIZE and make sure that the horiz ontal sc reen size of the picture size is in the bellow table. 20. Press the MENU/OK key and memorize the set value. 21. Input a NTSC VIDEO signal (60Hz) from the EXT terminal, and make sure that the horizontal screen size is in the below table. 22. Press the MENU/OK key and memorize the set value.
ASPECT MODE ADJ. ITEM H-SIZE REGULAR 92%
ZOOM ZOOM 16 : 9
Ad justment of EW-PIN
23. Select 6.EW-PIN and set the initial s etting value 24. Adjust EW-PIN and mak e the 2nd.vertic al lines at the left and right edges of the s creen straight. Also make sure that the 3rd vertical lines are straight. 25. Press the MENU/OK key and memorize the set value.