Yamaha SKB-180 Service-Handbuch - Seite 27
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TEST No
LCD display
20
SW Chk
020
21
A. LedChk
021
28
LCD On
028
29
LCD Off
029
34
PD4 Chk
034
35
Exp Chk
035
36
PB Chk
036
37
MIDI Chk
037
41
Rom Chk2
041
42
Ram Chk2
042
45
FRomChk2
045
47
Factory
047
48
TestExit
048
•
Other Tests
Popping Noise Check
Connect an 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.
· PHONES L, R: -78 dBu or less
Test descriptions, judging conditions, etc.
Checks the switches and LEDs on the panel. Press the switches as shown in the LCD. When a switch
is pressed, a sound is played at the prescribed pitch. (Refer to the Switch test item list on the next
page.) When a switch with LED is turned on, the LED will light up.
Make sure that "SW OK" is displayed on the LCD when all the switches are pressed as indicated.
To cancel the operation halfway, press the lowest key (white key C1) to return to the item selection
display.
Make sure that all the LEDs on the panel are turned on.
Make sure that all the dots on the LCD are turned on.
Make sure that all the dots on the LCD are turned off.
Connect a footswitch (FC-4 or FC-5) to the [SUSTAIN] jack.
Make sure that C3 is played when the [START/STOP] button is pressed while the pedal is depressed
(ON), and that C4 is played when the pedal is released (OFF). The sound will stop when the pedal is
depressed again.
Make sure that "PD4 OK" is displayed on the LCD.
Connect the Exp pedal to the [EXPRESSION] jack.
Press the [START/STOP] button to start the test and make sure that C3 is played when the
pedal is depressed (On), and that C4 is played when the pedal is released (Off).
Make sure that "Exp OK" is displayed on the LCD.
C3 is played when the [PITCH BEND] wheel is turned toward you to the minimum position (DW),
and C4 is played when the wheel is turned away from you to the maximum position (UP).
Make sure that "PB OK" is displayed on the LCD.
Connect the [MIDI IN] terminal and [MIDI OUT] terminal with a MIDI cable and then execute the
test.
Make sure that C4 is played and that "MIDI OK" is displayed on the LCD.
Checks the ROM connected to the CPU bus.
Make sure that "Rom OK" is displayed on the LCD.
It will take about 25 seconds for the check.
Checks the RAM connected to the CPU bus.
Make sure that "Ram OK" is displayed on the LCD.
Checks the FROM connected to the CPU bus.
Make sure that "FRom OK" is displayed on the LCD.
It will take about 30 seconds for the check.
Initializes the entire backup area to reset to the factory default.
"Fact" is displayed on the LCD during the test.
"Fact End" is displayed on the LCD when the test is fi nished.
This will leave the test program and change to the play mode.
KB-180/SKB-180
27