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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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Removing the power supply board (See Figs. 18 and 19.)
Remove the left and right side panels. 1. Disconnect the wires from connectors CN901, CN902, CN903 and CN904 on the power supply board. 2. Remove the screw L retaining the earth wire. 3. Remove the screw M retaining the power supply IC. 4. Remove the power supply board by pinching the four studs retaining the board using radio pliers, etc.
Stud CN903 Chassis Earth wire Stud Power transformer CN904 Stud CN902 Power supply IC
Radio pliers, etc.
Removing the main board (See Figs. 20 and 21.)
Remove the left and right side panels. Remove the top cover. Remove the front panel assembly. Remove the CD/Video mechanism assembly. 1. From the back side of the main body, remove the two screws N retaining the FM antenna terminal of the main board. 2. Remove the two screws P retaining the speaker terminal of the main board. 3. From the top side of the main body, remove the screw Q retaining the heat sink of the main board. 4. Slide the main board toward the front to remove it from the chassis. [Note] After assembly, apply a locking agent to the screw Q.
Power supply board Stud Chassis
FM antenna terminal Rear panel
N R P
Removing the voltage selector board (See Figs. 20 and 21.)
Remove the left and right side panels. Remove the top cover. 1. From the back side of the main body, remove the two screws R retaining the voltage selector board. 2. Slide the voltage selector board toward the front to release it from the studs. [Reference] To replace the voltage selector board, it is required to disconnect all of the wires from the power transformer and the power cord.
Stud Voltage selector board