Yamaha PSR-S750, Service Manual

Page: 69 / 139

69
PSR-S750/PSR-S950
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Other Tests
AUX IN
Check that the output is as shown in the following table when signals are input to the AUX IN.
INPUT
OUTPUT
OUTPUT (10 k Ω load) PHONES (33 Ω load)
L/L+R R L R
AUX IN L: Sine wave (1 kHz, 0 dBu)
R: No input
+7.4 ± 2 dBu -50.0 dBu or less +1.8 ± 2 dBu -40.0 dBu or less
AUX IN L: No input
R: Sine wave (1 kHz, 0 dBu)
-50.0 dBu or less +7.4 ± 2 dBu -40.0 dBu or less +1.8 ± 2 dBu
Noise Level Check
Connect the level meter (with JIS-C fi lter) to the L/R of the [PHONES/OUTPUT] jack. (33 ohms load)
Set the [MASTER VOLUME] to the maximum level and check the noise level.
· PHONES L, R: –90 dBu or less