Yamaha Clavinova CLP-920, Руководство по обслуживанию

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CLP-920/CLP-930
1. Preparation
To check the unit using the test program, the following measuring instruments and jigs will be required:
Level meter (IHF - C curve)
Frequency counter
Notes: Impedance must be 1Mohm or above.
Use stereo plugs, and connect 33 ohm load at PHONES terminal.
Unit setting:
MASTER VOLUME : Maximum
Tone :
PIANO 1
Pedal : OFF
Reverb : OFF
Other terminals : Not connected
2. How to enter the Test Program
While pressing the C#2, F2 and G#2 keys, turn the power switch on. The TEST MODE is
activated and the CLP-920 output an A3 sine wave. By pressing any key except the test select
keys below, the tone is turned off and the CLP-920 will enter the test select mode.
3. Proceeding through the Test Program
When CLP-920 is in the test select mode, each test is excuted by pressing each test select key as in the table below.
Test items
No. TEST Test Select Key Test Function and Judgment criteria
1 Version C1 - A1, Checks version for ROM.
C2 - A2 The integer (decimal) part of the ROM version number can be checked by
pressing the keys, one by one from C1 (C2) to A1 (A2). (* The key-number
conversion table is shown in the next page.)
When the pressed key agrees with the part number of the version, the CLP-920
outputs a C4 sine wave.
When the pressed key does not agree with the part number of the version, the
CLP-920 outputs a C2 sine wave.
2 ROM Check 1 C3 Checks all ROMs which are connected to CPU.
If the result of the test is “OK” , a C4 tone is heard.
If the result of the test is “NG” , a C2 tone is heard.
3 RAM Check 1 C3# Checks all RAMs which are connected to CPU.
If the result of the test is “OK” , a C4 tone is heard.
If the result of the test is “NG” , a C2 tone is heard.
11 TG1 Check D3 Outputs the sine wave by changing the channels (1 ch - 32 ch) in sequence from
F3 to C6.
When a voice switch is depressed, the tone of the voice will sound. After
autoscaling is finished, individual keys can be played. (If playing two or more
keys simultaneously, the key pressed first takes priority. )
13 PITCH Check D3# Connect the frequency counter to the [PHONES] terminal.
Check that the 441.0 +/- 0.2 Hz sine wave is output.
TEST PROGRAM (CLP-920)
C#2 G#2
F2