Yamaha EZ-AG, Руководство по обслуживанию

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EZ-AG
16
TEST PROGRAM
1. Preparation
PA-3C, PA-32 (AC adaptor) is used.
Jigs: Frequency counter, level meter (with JIS-C filter), MIDI cable
Note) Connect a stereo plug to the [PHONES/OUTPUT] jack at 33 ohms.
2. How to enter the Test Mode
While pressing the 1st fret, 2nd fret and 3rd fret of 6th string,
turn the [STANDBY/ON] switch on.
When the test mode is activated, the sign “
” is indicated
on the 7-seg. LED display.
3. Proceeding through the Test Program
1) Select the test item to be executed by pressing the [+] or [-] button.
(Use the [+] button to advance and the [-] button to return.)
2) Select the test item, then press the [STRUM] button to execute testing.
When the test result is OK, press the [STRUM] button and the currently completed test No. will be displayed. The
device will then return to the test item selection mode.
* The dot will be added to the test No. display for the test item that has been completed. (Ex. )
When the test result is NG, press the [DEMO] button to return to the test items for selection.
4. Test items list
TEST
No.
7-seg. LED for Each Test Test Function and Judgment criteria
1
2
3
4
6
11
13
14
15
19
Displays the ROM version.
ROM (Program, Wave) versions are displayed alternately on the LED.
Check the ROM. (IC302)
Checks the ROM that is connected to the CPU bus. (simplicity check)
Check the RAM. (IC303)
Checks the RAM that is connected to the CPU bus. (simplicity check)
Check the WAVE ROM. (IC201)
Checks the WAVE ROM that is connected to the CPU bus. (simplicity check)
Check the FLASH ROM. (IC305)
Checks the FLASH ROM that is connected to the CPU bus. (simplicity check)
It takes about 3 seconds.
Check the Sound Source (Autoscaling).
Outputs the sine wave from E2 to B4. Check the sound by hearing that there is not noise
or abnormal sound.
Check the pitch.
Connect the frequency counter to the [PHONES/OUTPUT] jack (either L or R).
(440.0 Hz +/- 1.76 Hz)
Check the output level (R) (1 kHz).
Connect the level meter to the [PHONES/OUTPUT] jack (R) and measure. (33 ohm load)
R side: -10.9 dBm +/- 2 dB
Disconnect the [PHONES/OUTPUT] jack and then check that only the speakers create sound.
Check the output level (L) (1 kHz).
Connect the level meter to the [PHONES/OUTPUT] jack (L) and measure. (33 ohm load)
L side: -10.9 dBm +/- 2 dB
Check the noise.
Connect the level meter (with JIS-C filter) to the [PHONES/OUTPUT] jack (L, R) and
measure. (33 ohm load)
L, R: less than -78.0 dBm
6th string/1st, 2nd, 3rd fret
[STANDBY/ON]
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