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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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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.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
R-7A55(W)/(B) R-7E45(W)/(B)
MAGNETRON REMOVAL
1. CARRY OUT 3D CHECKS. 2. Remove the air separate duct B from the chassis support and the air intake duct. 3. Disconnect the H.V. wire B and filament lead of the transformer from the magnetron. 4. Remove the one (1) screw holding the chassis support to the magnetron. 5. Move the air intake duct to left. 6. Remove the air deflector from the magnetron. 7. Carefully remove four (4) screws holding magnetron to waveguide, when removing the screws hold the magnetron to prevent it from falling. 8. Remove the magnetron from the waveguide with care so the magnetron antenna is not hit by any metal object around the antenna. 9. Remove the magnetron cushion from the magnetron. CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE THE R.F. GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.
FAN MOTOR REPLACEMENT
REMOVAL 1. CARRY OUT 3D CHECKS. 2. Remove the one (1) screw holding the noise filter to the chassis support. 3. Release the noise filter from the tabs of the fan duct. 4. Disconnect the wire leads from the fan duct. 5. Remove the one (1) screw holding the capacitor holder to the oven cavity back plate. 6. Release the tabs of the capacitor holder from the fan duct. 7. Remove the one (1) screw holding the fan duct to the oven cavity back plate. 8. Remove the fan duct from the oven. 9. Remove the fan duct from the fan motor shaft according the following procedure. 1) Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers. CAUTION: � Make sure that any pieces do not enter the gap between the rotor and the starter of the fan motor. Because the rotor is easy to be shaven by pliers and metal pieces may be produced. � Do not touch the pliers to the coil of the fan motor because the coil may be cut or injured. � Do not transform the bracket by touching with the pliers. 2) Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand. 3) Now, the fan blade will be free.
Coil
CAUTION: � Do not use this removed fan blade again. Because the hole (for shaft) of it may become bigger than a standard one. 10. Remove the two (2) screws and nuts holding the fan motor to the fan duct. 11. Now, the fan motor is free. INSTALLATION 1. Install the fan motor to the fan duct with the two (2) screws and two (2) nuts. 2. Install the fan blade to the fan motor shaft according the following procedure. 1) Hold the centre of the bracket which supports the shaft of the fan motor on the flat table. 2) Apply the screw lock tight into the hole (for shaft) of the fan blade. 3) Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet. CAUTION: � Do not hit the fan blade strongly when installed because the bracket may be transformed. � Make sure that the fan blade rotates smooth after installed. � Make sure that the axis of the shaft is not slanted. Install the fan duct to the oven cavity back plate with the one (1) screw. Insert the tabs of the capacitor holder to the fan duct. Install the capacitor holder to the oven cavity back plate with the one (1) screw. Install the noise filter to the fan duct and the chassis support with the one (1) screw. Re-connect the wire leads to the fan motor.
Shaft
3. 4. 5. 6.
Groove joint pliers
7.
Stator Gap Bracket Rotor
Shaft
Rear view
Axis Stator Rotor
These are the position where should be pinched with pliers
Table
Center of bracket
Side view
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