
    SY55 TEST PROGRAM

    A. HOW TO ENTER THE TEST PROGRAM
    Turn on the power switch of the SY55 and wait until the LCD has
initialized and displays a normal operating mode message.  While
pressing the [SELECT] switch, press and hold the [EXIT] switch then
the [UTILITY] switch.  The SY55 will indicate that you have entered
the Test Program by displaying the following message.

SY55  TEST ENTRY
V#.#  DD-MMM-YY
   and then:
EXT>EXT SEL>FACT
 -1>AUT  +1>MAN

    Use the [-1], [+1], [EXIT], or [SELECT] panel switches to select
the appropriate test mode.  If you press [-1], the auto test mode
will be initiated.  If you press [+1], the MANUAL test mode will be
initiated.  If you press [SEL], the SY55 will execute Test 31, "31.
Factory settings", and then automatically exit the test mode and
return to play mode (refer to Test 31 for details).  If you press
[EXIT], you will exit the test mode and return to the play mode.
    The MANUAL mode is the preferred method of running the test
program because it allows you to select or jump to any test and
execute it.  AUTO mode automatically executes each test in a fixed
order.  Some of the tests in the AUTO mode are automatically executed
due to the nature of the test.  Once the system has entered the AUTO
mode, use the  [PAGE+], [PAGE-] switch to select test, then press the
[ENTER] to execute the test. In the AUTO mode simply press the [EXIT]
to abort the test and execute Test 31, "31. Factory settings".


B.  PROCEEDING THROUGH THE TESTS
    (**MOST OF THESE FUNCTIONS MAINLY PERTAIN TO THE MANUAL TEST
MODE**)
When you enter the test program, the following display will appear.

|00; Test No ?     |
|                  |

    Use the [+1], [-1], [ENTER], [PAGE+], [PAGE-], [EXIT], or the
numeric key pad to move through the various tests of the test
program.

Pressing: [+1] will execute the test which follows the current test.
          [-1] will execute the test which precedes the current test.
          [ENTER] will execute the currently selected test.
          [PAGE+] will select the test which follows the current test
and displays the test items.  
          [PAGE-] will select the test which precedes the current
test and displays the test items.  
          [EXIT]  will execute Test 32, "32. EXIT" (refer to Test 32
for details).

    The numeric key pads 0 through 9 pad can be used to enter a
two-digit number to directly select a test.  Simply enter the number
and then press the [ENTER] switch.  For example, if you would like to
select TEST 6, press [0], [6] then press the [ENTER] switch.








    TEST SELECTION WHEN AN ERROR IS DETECTED
    In each of the following tests listed below, if an NG (No Good)
error is detected, you may press [EXIT], the SY55 will wait for the
entry of a test number. If [+1] is pressed, the test which follows
the current test will be performed.  You can then retry the test or
perform another test.  

 7. Panel switches       8. Pitch bend            9. Modulation wheel

10. Data entry          11. Keyboard             12. Aftertouch     
14. Card insert         16. Card protect switch  18. Wave card insert

20. Breath controller   21. Foot volume          22. Sustain switch 
  








            TEST PROGRAM TEST 1 - 49  (MANUAL MODE OPERATION)

    TEST 1.  WAVE ROM TEST

|01; Wave ROM Sum |
|                 |
    Performs a read test on the WAVE ROM.

    DISPLAY OF TEST RESULTS

|01; Wave ROM Sum |
|              OK |
or
|01; Wave ROM Sum |
|xx            NG |
(where xx = sum check value)

    TEST END
Ends after displaying the results.



    TEST 2.  SYSTEM ROM TEST

|02; ROM Sum       |
|                  |
    Performs a read test on the ROM for the following addresses.
IC1 : 00000h - 8000Fh   IC23: 80000h - 9FFFFh  
IC22: A0000h - BFFFFh                          

    DISPLAY OF TEST RESULTS

|02; ROM Sum      |
|              OK |
or
|02; ROM Sum       |
|ROM1 ICxx  yy NG  |

(where xx = IC# and yy = sum check value)

    TEST END
Ends after displaying the results.


    TEST 3.  SYSTEM RAM TEST

|03; RAM R/W       |
|                  |
    Performs a read/write test of RAM on the following addresses.
IC1 : 0FB80h - 0FF7Fh   IC21: 40000h - 47FFFh  
IC20: 50000h - 57FFFh   IC19: 60000h - 6FFFFh  

    DISPLAY OF TEST RESULTS

|03; RAM R/W       |
|              OK  |
or
|03; RAM R/W       |
|RAM1 ICXX     NG  |

(e.g. if RAM 1 is NG, an xx will mark out the IC number indicating
that it is no good.)

    TEST END
Ends after displaying the results.  All RAM data except IC1 (H8 CPU)
is preserved.
    TEST 4.  RAM BACKUP BATTERY TEST

|04; Battery       |
|                  |
    This test checks that the voltage of the RAM backup battery is
greater than 2.6V and less than 4.1V.

    DISPLAY OF TEST RESULTS

|04; Battery       |
|#.#V          OK  |
or
|04; Battery       |
|#.#V      lo  NG  |

    TEST END
Ends after displaying the test results.





    TEST 5.  LCD ALL DOTS ON/OFF TEST

|05; LCD           |
|               OK |

    Check that all dots of the LCD will simultaneously light ON and
OFF repeatedly.

    DISPLAY OF TEST RESULTS
    First, the display indicates "05 LCD", then all dots of the LCD
light On and OFF.  But, if you use the [+1] or [-1] switch to perform
this test, "05 LCD" message won't appear. 

    TEST END
    Press [EXIT] or [+1] to end the test.  If [EXIT] is pressed, the
SY55 will then be waiting for the entry of a test number.  Pressing
[+1] will execute the next test.





    TEST 6.  LED ON/OFF TEST

|06; LED           |
|                  |

    Check that a green LED blinks once then each red LED blinks once
in succession from the left end of the unit (refer to the diagram
shown below) and then verify that all LEDs blink together.  The
currently blinking LEDs will be displayed in the LCD as follows.

|06; LED           |
|REC Green On      | 
(e.g. The green RECORD LED is blinking)

    Check that all LEDs blink. (1 of the LEDs is dual-color
red/green LED)

    TEST END
    Press [EXIT] or [+1] to end the test.  If [EXIT] is pressed, the
SY55 will then be waiting for the entry of a test number.  Pressing
[+1] will execute the next test.

    TEST 7.  PANEL SWITCH TEST

|07; Panel Switch  |
|                  |

Press the panel switches consecutively from the [INTERNAL] switch to
switch [ENTER], according to the order indicated by the LCD display.

|07; Panel Switch  |
|Push INT-         |
(e.g. When checking [INTERNAL])

    If the switch is OK, a beep will sound and you should proceed to
test the next switch.  If the wrong switch is pressed an unexpected
code is sent from the PKS CPU, and the error message NG will be
displayed and no sound will be heard.  At this time, if the correct
switch is pressed then the proper code is received.  You will then be
able to proceed to test the next switch.  The display will indicate
OK, if all switches are good.



    DISPLAY OF TEST RESULTS
|07; Panel Switch  |
|Push INT       OK |
or
|07; Panel Switch  |
|Push xxx       NG |

    TEST END
    When switch [ENTER] is pressed, OK is displayed and the test will
end.  During the test, if NG is detected, refer to section B, "B. 
PROCEEDING THROUGH THE TESTS".


    TEST 8.  PITCH BEND WHEEL TEST

|08; Pitch Bend    |
|                  |

    According to the target value displayed on the LCD, slowly move
the pitch bend wheel.  Check that the value changes from 50 to 99
then to 00 and back to 50 (in other words, center to top then to
bottom and back to center).
|08; Pitch Bend    |
|xx  yy-zz         | 
(where xx = current pitch bend value, yy and zz = next target value)

    DISPLAY OF TEST RESULTS
|08; Pitch Bend    |
|xx  49-50    OK   |  
(where xx = pitch bend value at end of test)
or
|08; Pitch Bend    |
|xx  Center   NG   | 
(If the pitch bend value at the beginning or end of the test is not
center, then xx indicates the pitch bend value when NG was detected).

    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".




    TEST 9.  MODULATION WHEEL TEST

|09; Modulation    |
|                  |

    According to the target value displayed on the LCD, slowly move
modulation wheel 1.  Check that the value changes from 00 -> 20 - >
80 -> 99 then back down to 80 -> 20 -> 00 (in other words, from
bottom to top the back to the bottom).

|09; Modulation    |
|xx  yy-zz         |  
(where xx = current value of modulation wheel, yy and zz are the next
target values)

    DISPLAY OF TEST RESULTS
|09; Modulation    |
|00  00         OK |
or
NG (No change in display message)


    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".


    TEST 10.  DATA ENTRY SLIDER TEST

|10; Data Entry    |
|                  |

    According to the target value displayed on the LCD, slowly move
the data entry slider.  Check that the value changes from 00 -> 20 ->
80 -> 99 and the back down to 80 -> 20 -> 00 (in other words, from
the bottom to the top and back down to the bottom).

|10; Data Entry    |
|xx  yy-zz         |  
(where xx = current value of data entry,  yy and zz are the next
target values)


    DISPLAY OF TEST RESULTS
|10; Data Entry    |
|00  00         OK |
or
NG (No change in display message)

    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".












    TEST 11.  KEYBOARD TEST

|11; Keyboard      |
|                  |

    Play a scale on the keyboard from C1 to C6 with a steady and even
touch.

|11; Keyboard      |
|Push C1           | 
(e.g. in the case of C1)


    If the key switch is ok, the note will sound and you should
proceed to play the next key.  If you play the wrong key this will
produced an unexpected code to the PKS CPU and Err will be displayed.

As a result the sound of that note will not be heard.  However, if
the right key is played following the playing of the wrong key, then
correct code is received and the note for that key will sound.  You
can then proceed to play the next key.  If all key switches are good
then OK will be displayed on the LCD.
    DISPLAY OF TEST RESULTS
|11; Keyboard      |
|Push C6        OK |
or  
|11; Keyboard      |
|Push xx        NG | 
(if you played the wrong key)
or
|11; Keyboard      |
|Push xx_ Vel   NG | 
(if the initial touch was incorrect)

    TEST END
    When you play the C6 key and OK is displayed, the test will end.
If NG is detected during the test, refer to section B, "B.

PROCEEDING THROUGH THE TESTS".





    TEST 12.  AFTERTOUCH TEST

|12; After Touch   |
|                  |

    According to the target value displayed on the LCD, press a key
on the keyboard.  Check that the value changes from 00 -> 20 -> 80 ->
99 and back down to 80 -> 20 -> 00 (in other words, apply light
pressure and increase pressure to a heavier touch then decrease back
to a light touch).

|12; After Touch   |
|xx  yy-zz         |  
(where xx = the current aftertouch value, yy and zz are the next
target values)

    DISPLAY OF TEST RESULTS
|12; After Touch   |
|xx  00-02      OK |
(where xx = aftertouch value at end of test)
or
NG (No change in display message)
    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".


    TEST 13.  MIDI TEST

|13; MIDI          |
|                  |

    After connecting the MIDI IN to the MIDI OUT via a MIDI cable,
execute the test.  The following message will appear on the LCD.

|13; MIDI          |
|Tx:yy Rx:zz       |






    DISPLAY OF TEST RESULTS
OK (No change in display message)
or
|13; MIDI          |
|Tx:yy Rx:Data  NG |
(Unexpected data was received.)
or
|13; MIDI          |
|Tx:yy Rx:xx    NG |
(No data was received within a certain time.)

    TEST END
    Press [EXIT] or [+1] to end the test.  If [EXIT] is pressed, the
SY55 will then be waiting for 
the entry of a test number.  Pressing [+1] will execute the next
test.
If an error is detected, the SY55 will then be waiting for the entry
of a test number.




    TEST 14  DATA CARD INSERT TEST

|14; Card Insert   |
|                  |

    Insert a RAM card (MCD64) into the DATA card slot and execute the
test.  Check that when you remove and insert the card back into the
slot, the number on the display changes from 0 to 1 and that the OK
result is displayed.

    DISPLAY OF TEST RESULTS
|14; Card Insert   |
|               OK |
or
NG (No change in display message)

    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".


    TEST 15.  DATA CARDS READ/WRITE TEST

|15; Card R/W      |
|                  |
    This performs a read/write test on the following address of the
RAM card.  
CARD :  20000h - 2FFFFh

    Insert a RAM cards with the memory protect turned off and execute
the test.

    DISPLAY OF TEST RESULTS
|15; Card R/W      |
|1              OK |
or  
|15; Card R/W      |
|               NG | 
(e.g. if CARD 2 is No Good)

    TEST END
    After displaying the results, the test will end.  All card data
is preserved.
    TEST 16.  DATA CARD PROTECT SWITCH TEST

|16; Card Protect  |
|                  |

    Use a RAM card to check that the card protect switch status is
being read.  Check that when the switch is set from "protect off" to
"protect on", the number on the display changes from 0 to 1 and that
the OK result is also displayed.

    DISPLAY OF TEST RESULTS
|16; Card Protect  |
|               OK |
or
NG (No change in display)

    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".


    TEST 17.  DATA CARD BACKUP BATTERY TEST

|17; Card Battery  |
|                  |
    This test checks whether the voltage of the DATA CARD backup
battery is adequate or not.

    DISPLAY OF TEST RESULTS
|17; Card Battery  |
|#.#V          OK  |
or
|17; Card Battery  |
|#.#V      Lo  NG  |
or
|17; Card Battery  |
|#.#V      Hi  NG  |
or
|17; Card Battery  |
|No Card       NG  |

    TEST END
Ends after displaying the test results.
    TEST 18.  WAVEFORM CARD INSERT TEST

|18; Wave Card In  |
|                  |

    Check that when a waveform card is inserted into the slot, the
number on the display changes from 0 to 1 and that the OK result is
displayed.

    DISPLAY OF TEST RESULTS
|18; Wave Card In  |
|1              OK |
or
NG (No change in display)

    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".



    TEST 19.  WAVEFORM CARD READ TEST

|19; Wave Card RD  |
|                  |

    This test is utilized by the factory and it is not intended for
field service use.


    TEST 20.  BREATH CONTROLLER TEST

|20; Breath Cont.  |
|                  |

    Connect a breath controller and blow into it.  Check that the
number on the display changes from 00 -> 20 -> 80 -> 99 -> 80 -> 20
-> 00 (in other words, off to strong and back to off).

|20; Breath Cont.  |
|xx- yy-zz         |   
(where xx = current breath control value, yy and zz are the next
target values)
    DISPLAY OF TEST RESULTS
|20; Breath Cont.  |
|xx  00         OK | 
(where xx = breath controller value at end of test)
or
NG  (No change in display)

    TEST END
After displaying the result, the test will end.  If NG is detected
during the test, refer to section B, "B.  PROCEEDING THROUGH THE
TESTS".











    TEST 21.  FOOT VOLUME TEST

|21; Foot Volume   |
|                  |

Connect a foot controller and operate it throughout its range. Check
that the number on the display changes from 00 -> -> 20 -> 80 -> 99
-> 80 -> 20 -> 00 (in other words, starting from the raised position
then to the lowered position and back to the raised position).

|21; Foot Volume   |
|xx- yy-zz         |   
(where xx = current foot volume value, yy and zz are the next target
values)

    DISPLAY OF TEST RESULTS
|21; Foot Volume   |
|00  00         OK | 
(where xx = foot volume value at end of test)
or
NG  (No change in display)

    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".


    TEST 22.  SUSTAIN SWITCH TEST

|22; Sustain       |
|                  |

    Connect a sustain switch and press it on and off.  Check that the
number on the display changes from 1 to 0 then back to 1 and verify
that the OK result is displayed.

    DISPLAY OF TEST RESULTS
|22; Sustain       |
|1              OK | 
or
NG (No change in display)


    TEST END
    After displaying the result, the test will end.  If NG is
detected during the test, refer to section B, "B.  PROCEEDING THROUGH
THE TESTS".


    TEST 23.  WAVE ROM TEST

|23; Wave ROM RD   |
|                  |

    Performs a read test on the WAVE ROM for the following addresses.
ROM0L(IC23): 00000h - 7FFFFh, low byte    ROM0H(IC23): 00000h -
7FFFFh, high byte  
ROM1L(IC22): 80000h - FFFFFh, low byte    ROM1H(IC22): 80000h -
FFFFFh, high byte  






    DISPLAY OF TEST RESULTS
|23; Wave ROM RD   |
|               OK |
or 
|23; Wave ROM RD   |
|ROM0H ICxxx   NG | 
(e.g. if ROM0H is NG, an xx will mark out the IC number indicating
that it is no good.)

    TEST END
Ends after displaying the results.



    TEST 24.  1 kHz SOUND OUTPUT (OUTPUT L) TEST

|24; 1k Output L   |
|                  |

    Check that the correct signal is output from OUTPUT L and PHONES
(L) jacks.

    ITEMS TO CHECK
    Insert the appropriate 1/4" phone plugs into each output jack and
check OUTPUT L, OUTPUT R, and PHONES (L/R) outputs.  If necessary,
verify the frequency, output waveform, output level, and THD of each
output using a frequency counter, oscilloscope, AC voltmeter (with
12.47 kHz filter) and distortion meter.  The volume control must be
set at maximum for these checks.  While sounding, the LCD will
display the following message:

|24; 1k Output L   |
|Output On         |

    Listed below are the specifications and conditions of each output
during this test.
OUTPUT L:    1kHz +/-1.5Hz, sine wave, distortion 0.2% or less
(PHONES no load), +8.0dB +/-2dB (10k ohm load)  
OUTPUT R:    less than -50dB  
PHONES (L):  1kHz, sine wave, distortion 0.2%, +12.0dB +/-2dB (150
ohm load) 
PHONES (R):  less than -50dB


    Check that when the plug connected to OUTPUT R is pulled out, the
specifications is as follow:
OUTPUT L:    +2.0 +/-2dB

    TEST END
    Press [EXIT] to end the test.  After pressing [EXIT] three things
occur; 
(1) the following display will appear, (2) the sound will stop and
(3) the SY55 will wait for the entry of a test number.  

|24; 1k Output L   |
|Output Off        |

    If [+1] is pressed, the sound will stop and the next test will be
activated.







    TEST 25.  1kHz SOUND OUTPUT (OUTPUT R) TEST

|25; 1k Output R   |
||

    ITEMS TO CHECK
    Check that the correct signal is output from OUTPUT R and the
PHONES(R) jacks.  

    Insert the appropriate 1/4" phone plugs into each output jack and
check OUTPUT L, OUTPUT R, and PHONES (L/R) outputs.  If necessary,
verify the frequency, output waveform, output level, and THD of each
output using the previously specified test equipment (refer to TEST
24).  The volume control must be set at maximum for these checks. 
While sounding, the LCD will display the following message:

|25; 1k Output R   |
|Output on         |




    Listed below are the specifications and conditions of each output
during this test.
OUTPUT R:   1kHz +/-1.5Hz, sine wave, distortion 0.2% (PHONES no
load), +8.0dB +/-2dB (10k ohm load)  
OUTPUT L:   less than -50dB  
PHONES (L): less than -50dB
PHONES (R): 1kHz, sine wave, +12.0dB +/-2dB (150 ohm load) 

    TEST END
    Press [EXIT] to end the test.  After pressing [EXIT] three things
occur; 
(1) the following display will appear, (2) the sound will stop and
(3) the SY55 will wait for the entry of a test number.

|25; 1k Output R   |
|Output Off        |

    If [+1] is pressed, the sound will stop and the next test will be
activated.



    TEST 26.  HIGH CLICK SOUND TEST

|26; Click High    |
|                  |

    ITEMS TO CHECK
    Check that a high click signal is properly output from OUTPUT L,
OUTPUT R.

    Insert the appropriate 1/4" phone plugs into OUTPUT L, OUTPUT R
and PHONES (L/R) jacks, and observe the output waveform with an
oscilloscope and AC voltmeter (with 12.47 kHz filter).  Make sure
that the click volume control is set to maximum.  While sounding, the
LCD will display the following message:

|26; Click High    |
|Output On         |

    Listed below are the specifications and conditions of each output
during this test.
OUTPUT L:   0.0dB +/-2dB (10k ohm load)  
OUTPUT R:   0.0dB +/-2dB (10k ohm load)  
    Check that the output waveform is a rounded square wave.

    TEST END
    Press [EXIT] to end the test.  After pressing [EXIT] three things
occur; 
(1) the following display will appear, (2) the sound will stop and
(3) the SY55 will wait for the entry of a test number.  

|26; Click High    |
|Output Off        |

    If [+1] is pressed, the sound will stop and the next test will be
activated.

    TEST 27.  LOW CLICK SOUND TEST

|27; Click Low     |
|                  |




    ITEMS TO CHECK
    Check that a high click signal is properly output from OUTPUT L.

    Insert the appropriate 1/4" phone plugs into OUTPUT L, OUTPUT R
and PHONES (L/R) jacks, and observe the output waveform at OUTPUT L
jack with an oscilloscope.  Make sure that the click volume control
is set to maximum.  While sounding, the LCD will display the
following message:

|27; Click Low     |
|Output On         |

    Listed below are the specifications and conditions of each output
during this test.
OUTPUT L:   650 Hz +/-100Hz

    Check that the output waveform is a rounded square wave.





    TEST END
    Press [EXIT] to end the test.  After pressing [EXIT] three things
occur; 
(1) the following display will appear, (2) the sound will stop and
(3) the SY55 will wait for the entry of a test number.  

|27; Click Low     |
|Output Off        |

    If [+1] is pressed, the sound will stop and the next test will be
activated.


    TEST 28.  LDSP/PSRAM TEST

|28; LDSP/PSRAM    |
|                  |

    ITEMS TO CHECK
    Check that the correct signal is output from OUTPUT L and the
PHONES(L) jacks.  

    Insert the appropriate 1/4" phone plugs into each output jack and
check OUTPUT L output.  If necessary, verify the frequency, output
waveform, output level, and THD of each output using the previously
specified test equipment (refer to TEST 24).  The volume control must
be set at maximum for these checks.  While sounding, the LCD will
display the following message:

|28; LDSP/PSRAM    |
|Output On         |

    Listed below are the specifications and conditions of the output
during this test.
OUTPUT L:   1kHz +/-1.5Hz, sine wave, distortion 0.2%, +2.0dB +/-2dB
(10k ohm load)  








    TEST END
    Press [EXIT] to end the test.  After pressing [EXIT] three things
occur; 
(1) the following display will appear, (2) the sound will stop and
(3) the SY55 will wait for the entry of a test number.

|28; LDSP/PSRAM    |
|Output Off        |

    If [+1] is pressed, the sound will stop and the next test will be
activated.


    TEST 29.  16 VOICE OUTPUT TEST

|29; 16 Voice Out  |
|                  |

    ITEMS TO CHECK
    Check that the correct signal is output from each OUTPUT jacks.


    Confirm that each signal of channel 1 through channel 16 is being
sent once in succession for approximately 0.5 sec. to OUTPUT L using
an amplifier and speaker to monitor the signal.  The channel of
currently sounding voice will be displayed in the LCD as follows.

|29; 16 Voice Out  |
|Output Ch xxx     |
(where xx = channel of currently sounding voice)

    TEST END
    Press [EXIT] to end the test.  After pressing [EXIT] three things
occur; 
(1) the following display will appear, (2) the sound will stop and
(3) the SY55 will wait for the entry of a test number.

|29; 16 Voice Out  |
|Output Off        |

    If [+1] is pressed, the sound will stop and the next test will be
activated.


    TEST 30.  JACKS TEST

|30; Jack B/F/S    |
|                  |

    With nothing connected to the Breath controller, Foot Volume,
Sustain jacks, check that the correct value appears.

    Connect the Breath Controller, Foot Volume and Sustain Switch
pedals to the appropriate jacks, then check that the following
display appears.  

|30; Jack B/F/S    |
|Push ENT          |

    Remove the pedal plugs and press the [ENTER] to execute the test,






    DISPLAY OF TEST RESULTS
|30; Jack B/F/S    |
|          OK      |  
or
|30; Jack B/F/S    |
|BC        NG      | 
(e.g. if the breath controller jack is NG)
or
|30; Jack B/F/S    |
|FV        NG      |
(e.g. if the foot volume jack is NG)
or
|30; Jack B/F/S    |
|SU        NG      |
(e.g. if the sustain switch jack is NG)

    TEST END
    The result is displayed and the test will end.




    TEST 31.  FACTORY SET TEST

|31; Factory Set   |
|                  |

    This test is used to initialize the data listed below to the
factory settings:

Synthesizer system data
64-internal voice data
16-internal multi data
Sequencer setup data

    When this test is executed, the following display will appear.

|31; Factory Set   |
|Sure?_            |

    If you press [+1], the factory preset data will be restored.  If
you press [-1], they will not be restored.


    DISPLAY OF TEST RESULTS
    If factory settings are restored.

|31; Factory Set   |
|               OK |

    If not restored there will be no change in the display as shown
below.

|31; Factory Set   |
|Sure? No          |

    TEST END
    The LCD displays the results, the factory preset data will be
restored, and the test will then end.  After the factory preset data
has been restored, the system data will be as follows:

||
||DATA



    TEST 32.  EXIT TEST PROGRAM

|32; Exit          |
|                  |

    When this is executed, the following display will appear.

|32; Exit          |
|Sure?_            |

    To exit the test program mode, press the [+1] switch.  To remain
in the test program mode press the [-1] switch.  This will cause the
SY55 to wait for the entry of a test number.




                ******** END OF FILE ********


 YAMAHA Music Synthesizer --- Synthesizer part          Date: 12/08/1989
          Model  SY55       MIDI Implementation Chart    Version: 1.0 YCA
+--------------------------------------------------------------------------+
|       Function       |  Transmitted   |   Recognized    |    Remarks     |
|______________________|________________|________________ |________________|
| Basic     Default    | 1 - 16         | 1 - 16          |                |
| Channel   Changed    | 1 - 16         | 1 - 16          |   memorized    |
|______________________|________________|________________ |________________|
|           Default    | 3              | 1, 3            |                |
| Mode      Messages   | x              | x               |   memorized    |
|           Altered    | ************** | x               |                |
|----------------------|----------------|-----------------|----------------|
| Note                 | 36 - 96        | 0 - 127         |                |
| Number :  True voice | ************** | 0 - 127         |                |
|----------------------|----------------|-----------------|----------------|
| Velocity  Note ON    | o 9nH,v=1-127  | o  v=1-127      |                |
|           Note OFF   | x 9nH,v=0      | x               |                |
|----------------------|----------------|-----------------|----------------|
| After     Key's      | x              | x               |                |
| Touch     Ch's       | o              | o               |                |
|----------------------|----------------|-----------------|----------------|
| Pitch Bender         | o              | o  0 - 12 semi  |7 bit resolution|
|----------------------|----------------|-----------------|----------------|
|                    0 | x              | o               |                |
|                    1 | o              | o               | Mod Wheel      |
| Control            2 | o              | o               | Breath cont.   |
|                  3-5 | x              | o               |                |
| Change             6 | o (play mode)  | o               | Data Entry knob|
|                    7 | o              | o               | Volume         |
|                 8-63 | x              | o               |                |
|                   64 | o              | o               | Sustain switch |
|               65-120 | x              | o               |                |


MODEL: SY55        TROUBLESHOOTING HINTS
------------------------------------------------------------|
SYMPTOM                      |POSSIBLE CAUSES               |
-------                      |---------------               |
After loading Drums 1 card   | This card contains system    |
using "All", unit produces   | data that is loaded when     |
no sound.                    | using the "All" screen.      |
                             | Make the following changes to|
                             | correct problem:             |
                             |   Master Tune: -64 to 0      |
                             |   Transpose: -64 to 0        |
                             |   MIDI Rcv Ch: 3 to 1        |
                             |   Note: Even to All          |
                             |                              |
                             | This is the only card that   |
                             | causes this condition.       |
                             |                              |
                             |                              |
                             |                              |
                             |                              |
                             |                              |
------------------------------------------------------------|

Owners Manual Addendum

   The step entry mode on the SY55 is performed by first
choosing the length of the first note to be tied.  Next
press the tie button (-), then pressing the length of the
second note to be tied.  After these operations have been
performed do you actually depress a selected key on the
keyboard.



















































