Test Program & Initialize - Yamaha an200 Service Manual

AN200
TEST PROGRAM & INITIALIZE
1. TEST PROGRAM
PREPERATIONS
Following measuring instruments and jigs are required for the test.
Measuring instruments : frequency counter(input impedance: more than 1M Ω)
Jigs :
Confirm to rotate every control/knob counterclockwise to bottom.
Precautions before starting the test program:
After disassembling/ assembling the unit, confirm that following caution is properly observed before performing any test program.
After assembling the panel assembly, confirm that the voltage between the measuring points TP1 and TP2 (ground) on the soldered
surface of the DM circuit board is from 2.9 V up to 3.4 V (during the power standby mode).
Start up of the test program
While pressing the [SHOW VALUE], [STORE] and [EXIT] keys, turn on the STANDBY switch.
Proceeding through the test program
When the test program is started, first "TEST" will appear on the LED display for about one second and then the test program version
and the test number will appear consecutively.
Display on the starting up of the test program
Display of the test version
Rotate the [DATA] knob to select the appropriate test program.
Press [STORE] key to perform the test.
When the result is normal (OK), the number of the next test will appear on the LED.
In each test, if "NG" (No Good) error is detected, [Test No. nG] will be displayed on the LED and the program will be put on hold.
Press [EXIT] key to proceed to the next program.
The test procedure when an error is detected
In each test, if "NG" (No Good) error is detected, press [EXIT] to indicate the LCD display where you can select the next test number.
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oscilloscope(input impedance: more than 1M Ω)
volt meter(JIS-C curve, input impedance: more than 1M Ω, 0 dBm: 1mW 600 Ω)
distortion meter(input impedance: more than 1M Ω)
digital multimeter(input impedance: more than 1M Ω)
keyboard amplifier(a KS15-equivalence)
MIDI cable