Yamaha BBT500H Service Manual page 33

c. Change the position of LINE SOURCE switch THRU → PRE EQ → POST EQ and check the
indication of LED "2.6c" → "2.6r" → "2.7L".
Change the position of SP SIM switch OFF → LINE → ON and check the indication of LED
LED "2.7c" → "2.7r" → "2.8L".
Change the position of OUTPUT LIMITER switch OFF → ON and check the indication of LED
LED "2.8r" → All LED → "3.".
3 - 4.VR check
a. Check the position of SOUND TYPE,COMP,GAIN,MASTER,LOW MID,MID,HIGH MID,TREBLE, OUTPUT
are center.
b. Push FUNCTION while LED indicates "3.". Then LED indicates "3.0L" and MODERN lights.
Turn left SOUND TYPE one click at a time and check change lighting LED MODERN → VINTAGE....
When turn to left end SOUND TYPE then all LED lights one time. LED indicates "3.0r" and FLAT lights.
Turn right SOUND TYPE one click at a time and check change lighting LED FLAT → TUBE....
When turn to right end SOUND TYPE then all LED lights one time and LED indicates "3.1L".
Return SOUND TYPE to center.
c. LED indicates "3.1L". Turn left COMP. Then all LED light one time and LED indicates "3.1r".
Turn right COMP. Then all LED light one time and LED indicates "3.2L". Return COMP to center.
Repeat the same thing from GAIN to OUTPUT and check the indication of LED "3.2r" → "3.3L"..."3.9r".
d. Turn right OUTPUT. Then LED indicates "4.".
3 - 5. MIDI check
a. Check that both terminals of MIDI IN &MIDI OUT are connected with MIDI cable.
b. Push FUNCTION while LED DISPLAY indicates "4.".Then All LED of PN sheet light one time and
LED DISPLAY indicates "5.".
c. If LED indicates "Er0", it is the error.
3 - 6. ROM Check
a. Push FUNCTION while LED DISPLAY indicates "5.".Then All LED of PN sheet light one time and
LED DISPLAY indicates "6.".
b. If LED DISPLAY indicates "E0","E1","E2","E3",it is the error.The details of errors are
E0 : Generate an error when delete the sector.
E1 : Can't delete the sector.
E2 : Generate error when write the sector.
E3 : Written data is not true.
4. Electric charactristics check
a. Push FUNCTION while LED indicates "6.".Then LED indicates "dSP".
b. Input the signal and mesure following items.
c. Check the wave forms of output signals are sine wave when check the value of output signals.
4 - 1.Light Check
Input point Input frequency Input level State
INPUT
(JK301)
LD301(red) and LD302(green) don't light.
-40dBm
1kHz -30dBm LD301(red) lights but LD302(green) doesn't light.
LD301(red) and LD302(green) light.
-10dBm
BBT500H
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