Read Sony SCD-1 / SCD-777ES Service Manual online
9
2-5. CLOCK CIRCUIT
Three crystal oscillators are used for clock output.
*X701 (16MHz): Clock for the main microprocessor (IC701).
*X1001 (8MHz):Clock for the display microprocessor (IC1002).
*X301 (45MHz): Master clock (1024fs; fs = 44.1kHz). Makes the divisions that create the clocks.
*X701 (16MHz): Clock for the main microprocessor (IC701).
*X1001 (8MHz):Clock for the display microprocessor (IC1002).
*X301 (45MHz): Master clock (1024fs; fs = 44.1kHz). Makes the divisions that create the clocks.
Fig. 2-2. Master Clock’s Divisions
Servicing Know-how: Confirming the clocks
The test point for confirming the clocks is around the center of the main board. First find the appropriate place under “Indications on
Board,” below, and then confirm the clocks.
When confirming the clock, check the signal level and frequency. Normally it is only necessary to make sure that the clock is output. Even
if the signal waveform is not vertically symmetrical there is no problem.
Table 2-2. Clock Confirmation
Clock
Indication on Board
Indication on Service Manual Pattern Diagram
Terminal Position
Specified value
44. 1kHz (fs)
REF-LRCK
TP704
Pin 4 of IC715
44.1kHz+5Hz
27MHz
27MHz
JL926
FL717
27.000MHz+1kHz
22MHz (512fs)
22MHz
JL925
Pin qf of IC703
22.58MHz+500Hz
DSD decoder (IC703)
SSP (IC512)
ARP (IC702)
PLL (IC715)
PLL (IC714)
X301
IC302 (D/A converter)
PLL (IC305, IC306, IC307)
AUDIO board
1024fs (45MHz)
256fs (11.28MHz)
64fs (2.8MHz)
fs (44.1kHz)
MAIN board
27MHz
768fs (33.86MHz)
512fs (22.58MHz)
PLL (IC713)
DEVIDER ( IC710)
DEVIDER ( IC710)
768fs (33.86MHz)
27MHz
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