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Quality scan, great manual. I solved my problem with this manual.
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.
Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
 Disc Loading
Switch ON! Disc arm(L) Disc arm(R)
(1) Turning the loading switch ON 1) When a disc is inserted, the disc arms open to the left and right and the claw below disc arm (L) sets the loading switch ON. 2) The above starts the motor rotation.
(2) Loading the disc 1) When the motor starts rotation, the worm gear also starts to turn as shown in the figure. 2) The rotation force is transmitted to the gear train. 3) When the force is transmitted to the final gear, the rollers rotate to pull in the disc.
Disc guide Disc IN Rubber rollers
Disc OUT Roller
The disc is pulled in or out when the rollers are pushed against the disc guide.
Side view Disc IN
 Operation of Slider (R)
(1) Activating the trigger arm 1) When the disc is pulled in by the rollers, the disc edge pushes the trigger arm and rotates it.
Position pushed by the disc Trigger arm
Center of rotation
2) When the disc is an 8cm disc, it is pulled upwards by the tapering on the disc guide. The trigger arm is rotated when the disc pushes the claw (section A) located before the trigger arm.
Disc Clamper chassis
When the 8cm disc reaches the loading end position, the roller areas supporting the disc decreases. To prevent the disc from dropping in this case, the claw is provided with a projection for supporting the disc.
Claw (A) Projection 8cm Disc Disc