Yamaha PSR-E343, Service Manual

Page: 28 / 49

28
PSR-E343/PSR-E344/YPT-340
•
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. Make
sure 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 fi lter) 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: –75 dBu or less
Battery Charging Check
Connect the AC adapter to the [DC IN] jack.
Con fi rm that the unit shall be performed normally, and no voltage is generated between spring terminal A - B.
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TEST
No.
LCD display
Test descriptions, judging conditions, etc.
57
057: FRomChk2
Checks the FROM connected to the CPU bus. (Full address)
Make sure that “
FRom OK ” is displayed on the LCD.
It will take about 100 seconds for the check.
60
060: Factory
Initializes the entire backup area to reset to the factory default.
“
Fact -- ” is displayed on the LCD during the factory set.
“ Fact End ” is displayed on the LCD when the factory set is fi nished.
Do not turn off the power during this process.
61
061: TestExit
This will leave the test program, reset the system and change to the play mode.
Do not turn off the power until the main screen is displayed.