Sharp CD-PC1881V Service Manual page 47

IC2 VHiLC78631E-1: Servo/Signal Control (LC78631E) (2/2)
Pin
Terminal Name Input/Output
No.
51 XVSS —
52 XOUT Output
53 XIN Input
54 XVDD —
55 RVSS —
56 RCHN Output
57 RCHP Output
58* RVDD —
59* MUTER Output
60* SBSY Output
61* EFLG Output
62* PW Output
63* SFSY Output
64 SBCK Input
65* DOUT Output
66* FSX Output
67 WRQ Output
68 RWC Input
69 SQOUT Output
70 COIN Input
71 CQCK Input
72 RES Input
73* FAST Output
74* CONT2 Output
75 16M Output
76 4.2M Output
77 TEST5 Input
78 CS Input
79 DEFI Input
80 VCOC Input
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Note: The same potential must be to the power terminals (VDD, VVDD, LVDD, RVDD, XVDD).
Unused input ports of general-purpose input/output ports (I/O) must be connected to 0V or set output port.
V/P 15
CLV+, 13
CLV
14
CLV-
FRAME
FSEQ 22 SYNCHRONOUB
PROTECTION
PCK 21
EFMO 9
PLL
DETECT
EFMI
11
79
DEFI
PD02, 2,
PD01 3
FR, 5,
7
ISET
FAST 73
VARIABLE
VPDO 1
PITCHRO
VCOC 80
PKK
53 19,20 28,29 30,31 23,24,25 78,68
52
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Crystal osccillator garound. Normaly 0v.
16.9344 MHz crystal oscillator connections. Use a 33.8688 MHz Crystal oscillator for quadspeed playback.
16.9344 MHz crystal oscillator connections. Use a 33.8688 MHz Crystal oscillator for quadspeed playback.
Crystal oscillator power supply.
Right channel ground. Normaly 0V.
Right channel N output.
One-bit D/A
Right channel P output.
converter pins
Right channel power supply.
Right channel mute output.
Subcode block synchronization signal output.
C1 and C2 error correction state monitor.
Subcode P,Q,R,S,T,U and W output.
Subcode frame synchronization signal output. Falls when the subcode output goes to the standby state.
Subcode readout clock input. This is a Schmitt input.
Digital output.
Outputs a 7.35 kHz synchronization signal generated by dividing the crystal oscillator frequency.
Subcode Q outputstandby output.
Read/write control input.
Subcode Q output.
Input for commands from the control microprocessor.
Command input acousition clock. Also used as the SQOUT subcode readout clock input.
This is a Schmitt input.
Chip reset input. This pin must be set low temporary when power is first applled.
Not used
Output port.
16.9344 MHz output. 33.8688 MHz output in 4x playback mode.
4.2336 MHz output.
Test input. A pull-down resistor built in.
Chip select input. A pull-down resistor is built in.
Defect detection signal input.
Variable pitch VCO control input.
EFM
DEMODULATION
FAST
SUB CODE
DEMODULATION
TJ
COMMAND
I/F
64 60,62,63,67,69
70,71
Figure 47 BLOCK DIAGRAM OF IC
Function
ADDRESS
GENERATOR
DRAM
DATA
CIRC
COMPENSATION
(ECC)
MUTE
ANTI-SHOCK I/F
D-ATT
DE EMPHASIS
DOUT
DF
65 32 34,35,36
– 47 –
CD-PC1881V
66, FSX,
61
EFLG
42,
LRSY,
43,
CK2,
44,
ROMXA,
45
C2F
33, P5,
38 PO/DFCK
PQRT
59 MUTER
RCHP,
56,
RCHN
57
DAC
LCHP,
48,
LCHN
49
46 MUTEL