Yamaha DME4io-ES Service Manual page 63

3-9. RTC Test (NO. 09)
Contents: Initializes the Real Time Clock of the RTC controller: RTC-4543, and displays the time renewal. "2000. 1. 1
(SUN) 0: 0: 0" is displayed when the test is started. Checks if the clock is working.
Example of Executing Screen
*** 09. RTC ***
2000. 1. 1(SUN) 0: 0: 0
OK:[ENTER], NG:[0]
Messages
• When an elapsed time renewal error is detected:
Troubleshooting
Check the signals connected to the following terminals in case of NG.
Each signal connected to the RTC-4543SA (CPU circuit board: IC013)
3-10. WORD CLOCK Test (NO. 10)
Contents: Checks for operation of the internal word clock and the external word clock (ETHERSOUND). For the
internal word clock, the test aims to check the operation of the crystal oscillator and the PLLP2.
Example of Executing Screen
*** 10. WORD CLOCK
INT OK.
EXT OK.
EXIT:[ENTER]
q Automatically judged if the word clock is generated by measuring the frequency of the internal word clock with the
internal counter and CPU.
w Then, checks the operation of the word clock (96KHz) from the ETHER SOUND (ES) circuit board.
Messages
• In case of abnormality of Internal clock:
• In case of abnormality of ETHER SOUND Word clock:
Troubleshooting
Check the signals connected to the following terminals in case of NG.
EXTWC2561 (131Pin), ICK49 (120Pin) of PLLP2 (DSP circuit board: IC052)
or malfunction of PLLP2 (DSP circuit board: IC052)
3-11. REMOTE Test (NO. 11)
Contents: Automatically checks by looping back the output from the REMOTE terminal with jig.
Preparations: Connect the jig for REMOTE test to the REMOTE terminal. Select RS232C for the RS232C/422
selection of the DIP SWITCH.
RS232C
Left Right
U
RS422
U: Up
***
DME4io-ES/DME8i-ES/DME8o-ES
NG: RTC DATA ERROR!
NG: INTERNAL WC ERROR
NG: ETHER SOUND WC ERROR
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