Look closely at the back of the cassette player circuit board (or through a tiny hole in the outer casing, often labeled "SFR" or near the motor).
Turn the unit over to the back shell. Locate and remove the visible small Phillips screws. Keep them organized in a magnetic tray.
Spray a tiny burst of electronic contact cleaner into the openings of the volume wheel and the AM/FM/Tape function switch. Rotate the wheel and slide the switch back and forth 20 times to clear out internal corrosion. Step 6: Reassembly and Speed Calibration
The best starting points are , Remont-aud.net , and Diagram.com.ua , which all reference the HS-TA293. You can also find the HS-TA293YL Chinese repair manual for free on JD-manual.com. The Russian site remont-aud.net explicitly lists the HS-TA293 among its manuals.
Use a Q-tip with a drop of isopropyl alcohol to gently clean the playback head (the silver rectangle) and the pinch roller (the rubber wheel). Dust here kills high-end frequencies.
Press the PLAY button. Observe if the motor turns, the belt moves seamlessly, and the black plastic take-up reel rotates vigorously. Press STOP. Remove the batteries to complete reassembly. Step 7: Reassembly
Several websites list the Aiwa HS-TA293 service manual, though availability varies:
The drive belt is the most likely culprit when cassette playback fails. Over time, original belts become loose, stretch, or turn into sticky black goo.