Sharp DV-550U, Service Manual

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DV-550U
12-5
Pin No. Terminal name I/O Operation function Remarks
19 TESIO0 I Test input/output terminal. Usually fixed to “L”.
20 P2VREF – PLL system 2VREF terminal.
21 SPDO O VCO center frequency shift terminal.
22 PDOS O EFM and PLCK signal phase error signal output terminal.
(To be used when x8 speed operation is used)
23 PDO O EFM and PLCK signal phase error signal output terminal.
24 TMAXS O TMAX detection result output terminal.
To be selected with command bit TMPS.
25 TMAX O
26 LPFN I Reverse input terminal for low pass filter amplifier.
27 LPFO O Output terminal for low pass filter amplifier.
28 PVREF – PLL system VREF terminal.
29 VCOREF I VCO center frequency reference level terminal.
To be fixed usually to “PVREF”.
30 VCOF O Filter terminal for VCO.
31 AVSS – Analog system ground terminal.
32 SLCO O Data slice level generation DAC output terminal.
33 RFI I RF signal input terminal.
34 AVDD – Analog system power terminal.
35 RFCT I RFRP signal center level input terminal.
36 RFZI I RFRP zero cross input terminal.
37 RFRP I RF ripple signal input terminal.
38 FEI I Focus error signal input terminal.
39 SBAD I Sub-beam addition signal input terminal.
40 TSIN I Test input terminal. To be fixed usually to “Vref”
41 TEI I Tracking error signal input terminal.
(Fetching when tracking servo is ON)
42 TEZI I Tracking error zero cross input terminal.
43 FOO O Focus equalizer output terminal.
44 TRO O Tracking equalizer output terminal.
45 VREF – Analog reference power terminal.
46 RFGC O RF amplitude adjustment control signal output terminal.
Output of 3-pole PWM signal. (PWM carrier = 88.2 kHz)
47 TEBC O Tracking balance control signal output terminal.
Output of 3-pole PWM signal. (PWM carrier = 88.2 kHz)
48 FMO O Feed equalizer output terminal.
Output of 3-pole PWM signal. (PWM carrier = 88.2 kHz)
49 FVO O Speed error signal or feed search EQ output terminal.
Output of 3-pole PWM signal. (PWM carrier = 88.2 kHz)
50 DMO O Disc equalizer output terminal.
Output of 3-pole PWM signal. (PWM carrier = DSP system
88.2kHz, to be synchronized with PXO)
51 2VREF –
TMAX detection result TMAXoutput
Longer than specific period “P2VREFF”
Shorter than specific period “VSS”
Within specified period “HiZ”