Yamaha spx2000 Service Manual page 37

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List of check items
Item Test name
1 MCS(PLLP)
2 BATT
4 DSP6,SIO
5 MIDI
6 USB MIDI
7 AES/EBU IN/OUT Check AES/EBU IN/OUT DIGITAL by executing loopback.
(DIO)
8 WORD CLOCK
9 LCD
10 PANEL LED
11 PANEL ALL LED
12 PANEL SW
13 ANALOG IN/OUT Check analog input/output.
14 NG LOG
Outline of Tests
1. MCS (PLLP2) test
Reg. (00, 0f, 10, 16) of PLLP2 is read and written for
comparison check. Reg.12 (Ver.) is read and displayed.
A0..A4 and D0..D15 are checked.
Reg.12 cannot be checked automatically because it is a
TE
L 13942296513
read only Reg.
Example of execution screen
MCS(PLLP2)
When testing starts, "testing..." appears on the screen.
"OK" is displayed when the MCS test ends with a
satisfactory result and "NG" when it ends with an
abnormality detected.
2. BATT test
The back-up battery is checked automatically with its
voltage measured by A/D.
Example of execution screen
BATTERY
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When testing starts, "testing..." appears on the screen.
.
"OK" is displayed when the battery test ends with a
satisfactory result and "NG" when the measured battery
voltage is 2.8V or lower.
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Outline of check item
Check the register of the gate array PLLP2 by reading/writing.
Check the voltage of the back-up battery/
Check the register of DSP6 by reading/writing and SIO connection.
Check MIDI OUT IN transmission and reception.
Check the USB circuit by initializing it and then executing loopback on the external PC.
Count the Fs of the oscillator using WCLK IN and check the lock state of PLL.
Check that the back-light lights up in each color and the entire screen is displayed in black and white. Visual check
Check that LEDs (including 7-segment LEDs) light up in the specified order.
Check that all LEDs light up in respective colors,
Check switches by pressing them in the specified order,
Check that a list of test numbers resulted in NG is displayed.
OK
NG
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3. There is no test program specified for No. 3.
4. DSP6, SIO test
The register of DSP6 is read and written to check the
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condition of Data BUS and Address BUS.
3 6 7 1 3 1 5
The data is read and written in the DRAM of DSP6 via
the register for the comparative check.
The OUT METER SIO connection of DSP6 is checked
by sending and receiving the signal.
Example of execution screen
DSP6 bit23,3,0
When testing starts, "testing..." appears on the screen.
"OK" is displayed when the DSP6 test ends with a
satisfactory result and "NG" when it ends with an
abnormality detected.
Caution
Cancellation of the test is invalid while it is being
executed.
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Judgment
Semi-auto
Semi-auto
Visual check
Visual check
Semi-auto
Visual check
0 5 8 2 9 9 4 2 8
NG
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SPX2000
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Auto
Auto
Auto
Auto
Auto
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