Other Tests; Popping Noise Check; Noise Level Check; Battery Charging Check - Yamaha PSR-E443 Service Manual

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Other Tests

Popping Noise Check

Connect the oscilloscope to the L/R of the [PHONES/OUTPUT] jack and turn on and then off the [STANDBY/ON] switch.
Confi rm that popping noise level is 1.0 Vp-p or less, and that no abnormal sound or popping noise is output from the speakers.

Noise Level Check

Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack. (33 Ω load)
Set the [MASTER VOLUME] to the maximum level and check the noise level. Do not insert any plugs to [AUX-IN] jack.
· PHONES L, R: –77 dBu or less

Battery Charging Check

Connect the AC adapter to the [DC IN] jack.
Confirm that the unit shall be performed normally, and no voltage is generated between spring terminal A - B.
PSR-E443
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