Yamaha SP2060, Service Manual

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SP2060
41
When NG, the testing item determined as NG are displayed along with its details.
Troubleshooting:
In case of NG, check the DSP7 (IC153 of DSP circuit board) and peripheral circuit.
3-5. WORD CLOCK Test (NO. 10)
Content: Checks for operation of the internal word clock.
Also checks for the operation of the crystal oscillator and PLLP2 together.
Example of execution screen
*** 10. WORD CLOCK ***
INT OK.
EXT OK.
EXIT:[ENTER]
Checks that the word clock oscillates normally by counting the internal word clock frequency with the internal counter and
CPU.
Message:
• When internal word clock abnormality is detected: NG: INTERNAL WC ERROR
Troubleshooting:
In case of NG, check the signal connected to EXTWC2561 (131pin) and ICK49 (120pin) of PLLP2 (DSP circuit board:
IC052).
Or the PLLP2 may be defective.
Notes:
• The external word clock is not tested. (“EXT OK.” is always displayed.)
• The word clock test from DIGITAL IN is executed in DIGITAL IN test.
(2) Display Screen at NG
*** 04. DSP7 ***
DSP7 CPUIF DATABUS---
CHIP #0 OK!
DSP7 CPUIF ADRBUS---
CHIP #0 OK!
DSP7 CPUIF CHIPSEL---
CHIP #0 OK!
DSP7 ERAMIF DATABUS---
CHIP #0 NG!
DSP7-1
ffffffff
DSP7 ERAMIF ADRBUS---
CHIP #0 NG!
DSP7-1
0000000f
...THE END OF DIAGNOSTICS
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DSP DIAG NG (-_-)
=======================
EXIT:[ENTER]