Yamaha DME24N, Service Manual, Page: 110 / 289

110
DME24N/DME64N
1-13. WORD CLOCK Test
Content: Checks for operation of the internal word
clock and the external word clock. For the internal
word clock, the test aims to check the operation of the
crystal oscillator and the routing function for the
external word clock. At the same time, the PLLP2 is
checked for its operation.
LCD screen
(1) Clock and Frequency Selection Screen
q
Select clock source by the [ ↑ ][ ↓ ] keys or encoder.
DME64: Built-in, BNC, SLOT1-4, CASCADE IN/OUT
DME24: Built-in, BNC, SLOT1
w
Press the [ENTER] key for execution and press the
[CANCEL] key for returning to the menu.
e
When the external clock is selected, Fs should be
set at 48 kHz fixed.
(2) Execution screen when internal clock is selected
q
When the internal clock is selected, the frequency
is automatically changed in the order of 44.1 kHz
→ 88.3 kHz → 48.0 kHz → 96 kHz.
w
For checking the crystal oscillator, the frequency is
checked by the counter of the Fs count master.
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13.
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WORD CLOCK
WCLK: INT
Fs:
44.1K 88.2K
48K 96K
EXIT: [CANCEL] EXEC: [ENTER] ,
SEL WCLK: [UP/DOWN]
Fig. 27. WORD CLOCK Test Screen (1)
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13.
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WORD CLOCK
INT. WCLK Testing
EXIT: [ENTER]
Fig. 28. WORD CLOCK Test Screen (2)
(3) Execution screen when external clock is selected
q
For externally input word clock, Fs is synchronized
at 48kHz for all external word clocks.
(4) Executed result screen when internal clock is
selected
(5) Executed result screen when external clock is
selected
q
Regardless of OK/NG, the clock count is displayed.
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13.
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WORD CLOCK
EXT1 (BNC) WCLK Testing...
Fig. 29. WORD CLOCK Test Screen (3)
Fig. 30. WORD CLOCK Test Screen (4)
Fig. 31. WORD CLOCK Test Screen (5)
Fig. 32. WORD CLOCK Test Screen (6)
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13.
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WORD CLOCK
INT WCLK OK!
NG: INTERNAL UNSYNC
EXIT: [ENTER]
Indicated in case of O.K.
Indicated in case of NG.
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13.
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WORD CLOCK
EXT1 (BNC) OK!
COUNT: 512
EXIT: [ENTER]
Indicated in case of O.K.
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13.
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WORD CLOCK
EXT1 (BNC) NG!
NG: EXTERNAL UNSYNC
COUNT: 557
Indicated in case of NG.