Yamaha PSR-S770, Service Manual

Page: 38 / 110

38
PSR-S770/PSR-S970
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TEST■PROGRAM
1.■ Measurement■condition
1-1.■ Environment
Perform tests under following conditions.
Ordinary temperature (5°C to 40°C)
Ordinary humidity (20% to 90%)
If the test results deviate from the test standard range, however, re-test under such conditions as the ordinary temperature (5°C
to 40°C) and ordinary humidity (30% to 90% relative humidity).
1-2.■ Power■voltage
Use PA-300C for the AC adaptor.
The AC power should be 50Hz or 60Hz and the capacity should be 500VA or more.
The voltage should be ±10% of the rating voltage of the adaptor being used.
1-3.■ Measuring■instrument
Make sure that the instruments used for inspections have enough accuracy and precision.
Use the instruments with more than 1M-ohms input impedance.
• Level meter (using JIS-C filter)
• Frequency counter (should be capable of measuring to three places of decimals)
• Oscilloscope
• Oscillator
1-4.■ Test■jig
Following jigs are required for testing.
• MIDI cable
• USB cable (A-B type)
• USB flash drive
• Foot controller (FC7)
1-5.■ Terminal■condition
Unless otherwise specified, take measurement at the PHONES jack. (Use a stereo plug.)
PHONES : Install a measuring plug (L/R ch: 33-ohms load)
AUX IN : Install a measuring plug
OUTPUT [L/L+R]/[R] : Install a measuring plug (L/R ch: 10k-ohms load)
FOOT PEDAL [1]/[2]: Connect the foot controller (FC7)
1-6.■ Control■condition
Unless otherwise specified, set control knobs as follows.
MASTER VOLUME : Max
Set others in the default state when the power is turned on.
1-7.■ Measurement■unit
0 dBu = 0.775 Vrms
* If you execute Test No. 81 Factory Set, the setting data and user data will be lost. Be sure to save these data for
backup in advance. (See page 64.)
• Stereo mini-plug cable (for AUX IN)
• Monaural phone plug cable (for MIC/GUITAR INPUT jack)
• RGB input display