Yamaha YDO-323 Service Manual page 27

TEST PROGRAM
1. Preparation
• Following items are required for testing. (Input impedance of measuring instrument is more than 1MΩ)
- Level meter (with JIS-C Filter)
- Frequency counter: Below decimal point 3 or more figures measurement is possible.
- MIDI cable
• Set each control as follows.
- MASTER VOLUME: Max
- PEDAL: OFF
Connect the measurement plug (stereo plug) to the [PHONES] jack. (33Ω load)
2. To enter Test Program
Turn on the power with [C#2], [F2] and [G#2] keys pressed and held simultaneously. (Fig. 1)
Once the Test Program is started properly, the sine wave of A3 sounds. To stop the sound, press the [DEMO/
SONG] button.
3. To proceed the test
Test items are listed in Table 1.
Press the corresponding key to select and execute each test. (See Fig. 2)
To enter the test item select mode after completing each test item, press the [DEMO/SONG] button.
# # # # # # #
A -1 C 0 D 0 F 0 G 0 A 0 C 1 D
A-1 B-1 C0 D0 E0 F0 G0 A0 B0 C1 D1
4. Test result
Each test result is indicated by the sound.
When the test result is OK, the sine wave of C4 sounds.
When the test result is NG, the sine wave of C2 sounds.
# # # # # # # # #
1 F 1 G 1 A 1 C 2 D 2 F 2 G 2 A 2
E1 F1 G1 A1 B1 C2 D2 E2 F2 G2 A2 B2 C3 D3
# #
C 2 F2 G 2
# # # # # # # #
C 3 D 3 F 3 G 3 A 3 C 4 D 4 F 4 G
E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4
2 4 10 12 14 17 26 31 41 43
1 3 5 9 11 13 15 16 18 27 28 35 42 45
Test No.
Fig. 1
# # # # # # # # #
4 A 4 C 5 D 5 F 5 G 5 A 5 C 6 D 6
B4 C5 D5 E5 F5 G5 A5 B5 C6 D6 E6 F6 G6 A6
47
YDP-323
# # #
F 6 G 6 A 6
B6 C7
48
Fig. 2
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