It can be identified from the following aspects:

1. Functional aspects of the electronic keyboard

1. Standard keys, the tone must be accurate, and the number of keys must be at least 61. With velocity, velocity is used to express different timbres.

2. There must be at least 50 timbres and at least 20 basic rhythms. The minimum polyphony number of the piano should not be less than 16 (preferably more than 24), otherwise the sound will be lost when playing certain works.

3. It must be equipped with a stereo output and an interface for connecting an external sustain pedal.

4. It must have some special functions: keyboard splitting and timbre superposition.

5. There are also some optional functions. For example, CASIO's timbre synthesizer, rhythm mixer, and multi-track recording. Floppy drive function of YAMAHA series.

2. The quality of the electronic keyboard

Test the sound: Check the timbre, timbre quality and intonation by trial playing and listening to see whether the timbre is pure, the sound quality is stable, and whether the noise is too loud. Then touch the keys with your hands to check whether the elasticity is uniform and reliable, and whether the sound response is sensitive.

2. Function check: After reading the instructions carefully, check whether each function is reliable, sensitive, and malfunctioning. Check the accompanying sound and whether the beat is accurate.

3. Tone performance: You can ask experienced people to check the timbre performance indicators. Generally speaking, electronic keyboards have beautiful and rich timbres, and can imitate the sounds of a variety of musical instruments, as well as various sounds in nature.

4. Appearance inspection: Check whether the components including the piano case, keyboard, power supply, control buttons, etc. are closely arranged and regular and smooth. Whether there are scratches, cracks, etc. on the surface. Check whether the trademark, factory number, quality specification certificate and instruction manual are complete and consistent.

3. Workmanship

1. The color is really full and well-made, as shown in the picture.

2. The fake ones are rough in workmanship and dull in color.

Extended information:

Yamaha differs from three aspects: model, function and price

1. Differences in models:

Yamaha series electronic keyboards It is divided into PSR-world model, KB-China customized series, and DGX-world model.

2. Differences in functions:

PSR-a world model, an entertainment piano with powerful functions and high entertainment value.

KB-China customized series, piano for teaching, easy to operate and practical.

DGX-world model, multi-keyboard configuration with 76 keys. Compared with the 61 keys of the previous two series, it has an extra set of half keyboards. Its functions are basically the same as those of PSR mid-price products.

3. Different prices:

PSR-world models: PSR-F51 699 yuan, PSR-E253 850 yuan, PSR-E363 995 yuan, PSR-E453 2700 yuan

PSR-S series: PSR-S670 6,030 yuan, PSR-S770 9,900 yuan, PSR-S970 13,500 yuan

KB-China Customized Series: KB90 1,049 yuan, KB19 2,075 yuan, KB191 2,210 yuan , KB290 2420 yuan, KB291 2550 yuan

Official website - Yamaha series