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 26 (click to view)
VC-M522HM VC-MH722HM VC-MH732HM
INSTALLING THE MASTER CAM (AT REAR SIDE OF MECHANISM CHASSIS)
1. Make sure beforehand that the shifter is at the point as shown below. 2. Place the master cam in the position as shown below.
REPLACEMENT OF LOADING MOTOR
� Removal
E ring (XRESJ30-06000) Master cam Apply grease Apply grease
Fully turn clockwise
Fully turn counterclockwise Face the wide tooth side ward No grease
Figure 4-44-1.
Note: See the figure below for the phase matching between the master cam and the casecon drive gear. 3. Finally fix with the E ring.
Master cam
Figure 4-45.
Casecon drive gear
Half-round notch Round mark
� Replacement Remove the loading motor, and install the replacement loading motor as shown below.
10.2 +0.2 mm �0.2
When installing the master cam, align the casecon drive gear round mark with the half-round notch of master cam.
Figure 4-44-2.
Figure 4-46. The loading motor pressing-in must be less than 147 N (15 kgf). Adjust the distance between motor and pulley to 10.2 +0.2 mm).
�0.2
