New goods operation Panasonic Panasonic thin high-quality sound model portable cassette player RQ-SX53-S maintenance goods Operation has been confirmed with an external AA battery box, and there is no problem using a gum battery on hand. Play/Stop/Fast forward/Rewind/Auto-reverse has been tested over a long period of time. The playback speed of both FWD and REV is stable and normal, and the speed difference has been measured and confirmed to be within the allowable range. Both FWD and REV have no annoying sound fluctuations, and the results of the wow and flutter measurement are good. Each operation button and each switching button on the main unit have been tested. Equipped with a 3.5mm standard earphone jack, you can enjoy using commercially available earphones. The included gum battery has not been tested Since this is a portable system, the driving force is weaker than that of a deck, so if you use a tape that is 90 minutes or longer, a tape that has deteriorated over time, or a poor quality tape made overseas, the sound may shake, the tape may not run, or the tape may get entangled. We do not recommend using it as it may cause malfunction. [Maintenance details] Body and accessories cleaning, overall clean finish Replacing high-quality, high-durability drive belts (no inferior general-purpose belts are used) idler gear repair pinch roller cleaning Capstan shaft cleaning Repainting of gear part grease Head cleaning, degaussing, azimuth adjustment Improved conduction of each contact part Victor 3KHz 0dB TEST TAPE for speed adjustment and wow and flutter measurement -etc. We do not mark merchandise values below value or mark items as “gifts” – US and International government regulations prohibit such behavior.