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 19 (click to view)
2-8. A/C HEAD UNIT
DECK POSITION : Normal
LEAD CONNECTOR a a A/C HEAD UNIT
(Removal)
1. Remove the LEAD CONNECTOR of the A/C HEAD UNIT shown in Fig. 2-8. 2. Remove the two screws (a) fastening the A/C HEAD UNIT shown in Fig. 2-8 to remove the A/C HEAD UNIT.
Head
(Installation)
1. Install the A/C HEAD UNIT shown in Fig. 2-8. Note : Never touch the head of the A/C HEAD UNIT shown in Fig. 2-8. Clean dirt on the head with alcohol, if necessary. 2. Install the LEAD CONNECTOR of the A/C HEAD UNIT shown in Fig. 2-8. 3. Perform �3-3. A/C HEAD Adjustment� and �3-4. Phase Adjustment� of �3. Interchangeability Adjustment of the Mechanism.�
Fig. 2-8
2-9. F/E HEAD
DECK POSITION : Normal
F/E HEAD
(Removal)
1. Lift the F/E HEAD shown in Fig. 2-9-1 in the direction shown by arrow A to remove it. Note : Be sure to replace the removed F/E HEAD with a new one.
A Counterclockwise
(Installation)
1. Install the F/E HEAD shown in Fig. 2-9-1. Note : Never touch the head shown in Fig. 2-9-2. Clean it with alcohol, if necessary.
