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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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HOW TO REPLACE A ROTARY UPPER DRUM (777HF, 778HFMODEL)
See below for note.
1) 2) 3)
HOW TO REMOVE A ROTARY UPPER DRUM
Remove screw 1 (+P3 Ã 8) and remove the ground shaft assembly 2. (Refer to Fig. 4.) Remove soldering which is marked by arrow and remove the rotary upper drum board completely. Remove two screws 3 (PSW3 Ã 8) and remove the rotary upper drum in the direction of A. (Refer to Fig. 5.) If removal is difficult, remove it while rotating it slowly.
HOW TO ATTACH A NEW ROTARY UPPER DRUM
Pay attention so that finger print or like must not be put when inserting a new upper drum into lower drum. Align mark of the rotary upper drum board with the mark of the rotary transformer board so that the screw hole on the upper drum and that on the lower drum are aligned. (Refer to Fig. 5.) If attaching is difficult, attach a upper drum while rotating it slowly.
Note: If removal is difficult, check again if soldering is removed completely.
2 Ground shaft assembly 1 Screw (+P3 Ã 8)
Note: Pay attention not to damage the video heads. Confirm that the upper drum is inserted completely. 4) 5) Tighten the two screws 3 (PSW3 Ã 8). (Refer to Fig. 5.) Fix the earth shaft 2 by tightening the screw 1 (+P3 Ã 8) so that protrusion at the tip of the earth shaft contacts the center of the drum shaft.
4 Plate spring
Drum when viewed from the top
Note: When attaching the ground shaft assembly 2, never give force to the plate spring 4.
3 PSW3 Ã 8
Upper drum assembly DZR-45-R (8-848-576-02) (777HF, 778HF)
Align the two arrow marks.
Lower drum assembly DZL-51B/J-RP (8-848-666-11) (777HF, 778HF)
NOTE : There are two types of drum assembly built in models except SLV-788HF (DZH-94A/Z-RP only). [Discrimination]
UPPER DRUM ASSEMBLY DZR-45-R (777HF, 778HF) (8-848-576-02)
DRUM ASSEMBLY DZH-94A/Z-RP (8-839-044-02)
There are two printed circuit boards on the top.
There is no printed circuit board.
Note: It cannot be divided to two parts, the upper and the lower drum assemblies.