- Safety Precautions
- Important for Laser Products
- Precautions at Disassembling and Parts Replacement
- Disassembly Method
- Adjustment Method
- Diagnosis which Uses Extension Wire Method
- Flow of Functional Operation until TOC Read
- Maintenance of Laser Pickup
- Replacement of Laser Pickup
- Description of Major ICs
- Block Diagrams
- Standard Schematic Diagrams
- Printed Circuit Boards
- Parts List
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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.
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<Rear panel assembly> Removing the tuner board (See Fig.19 and 20)
Prior to performing the following procedure, remove the metal cover. 1. Remove the two plastic rivets attaching the joint board, and remove the joint board. 2. Disconnect the card wire from connector CN1 on the tuner board. 3. Remove the two screws R attaching the tuner board on the back of the body.
CN712 S CN711 Input / output board Joint board Plastic rivets Tuner board CN1 Rear panel CN871
Removing the input / output board (See Fig.19 and 20)
Prior to performing the following procedure, remove the metal cover. 1. Remove the two plastic rivets attaching the joint board, and remove the joint board. 2. Disconnect the card wire from connector CN315 on the input / output board. 3. Remove the screw S attaching the input / output board on the lower right side of the body. 4. Remove the screw, E & F attaching the input / output board on the back of the body. 5. Disconnect connector CN870, CN871, CN711 and CN712 on the input / output board by pulling out them outward. Remove the input / output board from the body. Fig.20
(Only the model by which a digital output is installed)