Yamaha EZ-EG Service Manual - Page 18

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EZ-EG

DEMO

SOUND

TUNING

–

INSPECTION

(Preparation) PA-D09 (AC adaptor) is used. Set the [MASTER VOLUME] to maximum.

Jigs: Oscilloscope, voltmeter

Turn on the [POWER ON/STANDBY] switch.

(1) Check the speaker wires.

Select SOUND No. 5 and then generate sound C3 (6th string, 8th fret). Check that there is no static and no other abnormalities with the sound.

(2) MASTER VOLUME check.

Operate the [MASTER VOLUME] from its highest setting to its lowest setting. Check that there is no static and that the operation can

be performed smoothly.

(3) Check the sound source.

While pressing the [SOUND] button, use the [+] and [-] buttons to select the tones from No. 1 to No.5. Then at each tone, generate a

sound for each string. Check that the tone changes for each No. and that there are no other abnormalities.

(4) Pop noise check.

Connect an oscilloscope to the [PHONES/OUTPUT] jack and then turn the [POWER ON/STANDBY] switch on and off. Check that

the pop noise is less than 1.0 Vp-p.

(5) Battery operation check.

Insert a battery into the battery case. Then unplug the AC adapter from the DC-IN jack. Check that the unit performs normally by battery.

(6) Battery charger check.

Plug the AC adapter into the DC-IN jack. Then measure the voltage of the battery terminal. Check that the main unit operates normally

and that there is no voltage at the battery terminal.

(7) Static check.

Select Sound No. 5 and play all strings (with the [MASTER VOLUME] set to maximum and all other switches at their default

settings). Check that there is no static.

(8) Check the levelness of the neck.

Place the instrument on a level surface and check for neck deformation. Make sure there is no obvious next deformation.

(9) Check for foreign objects inside the main body.

With the power on, lift the unit up and then shake it up and down and from side to side. Check that the unit is clean and operating

properly and that there is no foreign material inside the unit or the LED.

(10) Visual inspection of the main body.

Visually inspect the condition of the entire unit including areas such as the neck switch section and the space between the fingerboard

and the upper case.

Check that there are no scratches and that the unit is clean. Also check that the tops of the switches are aligned and that none of the

switches is tilted or raised up. There should also be less than 0.5 mm of space between the fingerboard and the upper case.

(11) Setting to factory settings.

Momentarily turn off the power supply. Then, while holding down E3 (6th string, 12th fret), turn the [POWER ON/STANDBY]

switch on again.

Turn off the power supply to complete the inspection.

SONG

STRUM

1st fret of

1st string

CHORD

BOTH

2nd fret of

12th fret of

1st string

6 11 12

3 9 10

TEMPO

BALANCE

1st fret of

12th fret of

2nd string

6th string

CAPO