Yamaha MX61 Service Manual page 31

3. Test program list
Test
LCD display
No.
001 001: Version
002 002: ROM Chk1
003 003: RAM Chk1
004 004: Wave ROM Chk1
005 005: Effect RAM Chk1
006 006: All Memory Chk
007 007: Pitch Chk
008 008: Output R Chk
Displays the ROM Version.
Check the version of ROM (x.xx).
(OK: "B: x.xx" , "M: x.xx" , "W: x.xx" / NG: Otherwise)
Checks the ROM. (Simple check)
Check the ROM that is connected to the CPU.
(Read operation of all address lines and all data bus lines.)
After executing the test, confirm that "OK" is displayed on the LCD.
(OK: "OK" / NG: "NG")
Note: If the test no.6 (All memory simple check) is executed, this test can be skipped.
Checks the RAMs. (Simple check)
Check the RAMs that are connected to the CPU.
(Read/Write operation of all address lines and all data bus lines.)
After executing the test, confirm that "OK" is displayed on the LCD.
(OK: "OK" / NG: "NG")
Note: If the test no.6 (All memory simple check) is executed, this test can be skipped.
Checks the wave ROMs. (Simple check)
Check the wave ROMs that are connected to the tone generator.
(Read operation of all address lines and all data bus lines.)
After executing the test, confirm that "OK" is displayed on the LCD.
(OK: "OK" / NG: "NG")
Note: If the test no.6 (All memory simple check) is executed, this test can be skipped.
Checks the effect RAMs. (Simple check)
Check the effect RAMs that are connected to the tone generator.
(Read/Write operation of all address lines and all data bus lines.)
After executing the test, confirm that "OK" is displayed on the LCD.
(OK: "OK" / NG: "NG")
Note: If the test no.6 (All memory simple check) is executed, this test can be skipped.
Checks all the ROMs and RAMs. (Simple check)
Check all the ROM and RAMs connected to the CPU and the wave ROMs and
After executing the test, confirm that "OK" is displayed on the LCD.
(OK: "OK" / NG: "NG: ROM RAM Wave FX")
(In case of NG, either of them becomes "NG" . )
Note: If the test result is OK, the test no.2 through no.5 can be skipped.
Checks the pitch accuracy. While sound is output, "ON" is displayed on the LCD.
Connect a frequency counter to the [PHONES] terminal. (L or R)
Confirm that sound is produced with 441Hz ±0.2Hz sine wave.
Checks the output level R. While sound is output, "ON" is displayed on the LCD.
• Output Level and Cross Talk Level (PHONES)
Connect a level meter to the [PHONES] terminal (L and R).
Confirm each output level is as follows.
PHONES L: -62.0dBu or less
PHONES R: -4.6dBu ±2dB
• Output Level and Cross Talk Level (OUTPUT)
Connect the level meter to the OUTPUT jack ([L/MONO] and [R]). Insert the jacks to both
Confirm each output level is as follows.
OUTPUT L: -62.0dBu or less
OUTPUT R: +1.4dBu ±2dB
• Volume Attenuation
Connect the level meter to the OUTPUT terminal ([L/MONO] and [R]). Insert the jacks to both
Set the [MASTER VOLUME] knob to minimum, and measure the attenuation level.
Confirm the output level is as follows.
OUTPUT R: -62.0dBu or less
Test description, judging conditions, etc.
the effect RAMs connected to the tone generator.
the [L/MONO] and [R] terminals at the same time.
the [L/MONO] and [R] terminals at the same time.
MX61/MX49
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