Yamaha an200 Service Manual page 32

AN200
C-11 PB RAM
Check RAM of the plug-in board which is built in the unit.
Display of Test Results
OK:
NG:
Test End
The test result is displayed and the test will be finished.
C-12 PB MIDI IN
Transmit the test pattern from the unit to MIDI IN of the plug-in
board, which is built in the unit, and then transmit the test result to
the unit. Then confirm the test result.
Display of Test Results
OK:
NG:
Test End
The test result is displayed and the test will be finished.
C-13 PB MEL
Check if the power and MEL OUT of the plug-in board are working
properly. Confirm that MEL OUT outputs properly to OUTPUT (L,
R) of the unit.
Set MEL OUT of the plug-in board in the unit to output properly to
OUTPUT (L, R) of the unit. Then insert the appropriate phone plugs
into each output jack of the OUTPUT (L, R) and connect them to a
frequency counter, oscilloscope and AC volt meter.
The VOLUME control must be set at maximum.
Verify that the following signals are output from OUTPUT-L.
Frequency: 1kHz +/- 3Hz
Level: -2.0dBm +/- 2dBm
32
Display of Test Results
Not appearing
Test End
Rotate [DATA ENTRY] knob clockwise to proceed to the next test.
C-14 FACTORY SET
This test is used to initialize the data to the factory settings.
Following operation will execute the test.
Press [STORE] to execute the factory settings.
Press [EXIT] to indicate the LCD display where you can select the
next test number.
C-15 EXIT
Following operation ends the test mode and returns to the play mode.
Press [STORE] to end the test mode.
Press [EXIT] to indicate the LCD display where you can select the
next test number.
OTHERS
When the unit exits the test mode, it executes a normal start-up se-
quence same as what it does when the power switch is turned ON.
When the [STANDBY] switch of the unit is turned ON and OFF,
confirm that the clicking noises of the OUTPUT (L, R) is less than
0.5 V p-p.
When the unit exits the test mode and returns to the play mode, con-
firm that the noise levels of each output are as follows. An AC volt
meter must be connected for the measurements.
less than -88dBm (load 33k Ω)
OUTPUT (L,R):
less than -88dBm (load 33k Ω)
PHONES (L,R):