Yamaha PSR-E473 Service Manual page 27

No. Inspection items
066 Factory Reset
067 Test Exit
4. Other Test Items (Check in normal mode)
No. Inspection items
Popping Noise Level
-
Check
- Noise Level Check
No charging the
-
batteries Check
Vibration Noise Check
-
Procedures for selection and execution of test items
Reset all the backup region of the memories to the initial factory status.
1) Press the [START/STOP] button.
2) Do not turn off the power while "Fact --" is shown on the LCD.
When initialization is complete, "Fact End" is shown on the LCD.
3) Press the [START/STOP] button to return to the test item selection screen.
Lets you exit from the Test mode to the normal mode.
1) Press the [START/STOP] button.
The Test Program mode will end, then the instrument will be restarted in normal
mode.
* Never turn off the power until the Main display appears. Doing so may cause a
malfunction.
Check that the popping noise level is proper when turning the power on and off.
1) Connect an Oscilloscope to the [PHONES] jack.
2) Set the MASTER VOLUME to the maximum position.
3) Press the [ ] (STANDBY/ON) switch to check the noise level indicated on the
Oscilloscope when turning the power of the instrument on and off.
No problem if the following conditions are satisfied.
[PHONES] (33 Ω load)
• L, R: 1.0 V peak to peak or less
Check that the noise level is proper.
1) Connect the level meter (using JIS-C filter) to the Output jack on the rear panel.
2) Set the MASTER VOLUME to the maximum position.
3) Check the output levels of L and R ch indicated on the Level meter.
No problem if the following conditions are satisfied.
[PHONES] (33 Ω load)
• L, R: -78.0 dBu
[OUTPUT] (10 kΩ load)
• L/L+R, R: -76.0 dBu
* Do not connect anything to the [AUX IN] jack.
Checks whether the voltage is supplied to batteries.
1) Connect the AC adapter to the [DC IN] jack.
2) Measure the voltage between Battery terminal A and B, and confirm that it is 0.2V
or less.
Checks whether vibration noise occurs on the instrument.
1) Select Voice No.001 (L!CGrPno).
2) Set the Main Voice volume in the Function to the default value.
3) Set the MASTER VOLUME to the maximum position.
4) Perform scaling to check that no vibration noise occurs.
Procedure
PSR-E473
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