Kenwood LS-N50VS, Service Manual

Page: 5 / 27

RXD-V252/V252-H
5
CIRCUIT DESCRIPTION
Port No. Port Name I/O Function
1,25,26,31,72
75,77,91,100
VSS I Ground.
5,16,32,66
73, 78,90
VCC I Supply voltage for 5.0v.
6 DSC C I Clock for programming to access internal registers.
7 AUX0 I/O Unused.
9 AUX1 I/O Servo reverse or control pin.
11 AUX2 I/O Servo LD ON or control pin.
70 AUX3 I/O Unused.
69 AUX4 I/O Servo CCW/Close or control pin.
68 AUX5 I/O Unused.
67 AUX6 I/O Servo XLAT or control pin/VFD DO.
14 AUX7 I/O Servo BRKM/Sense or control pin/VFD DI.
18 AUX8 I/O Servo Mute/Open or control pin/VFD CLK.
20 AUX9 I/O Servo SQS0 or control pin.
34 AUX10 I/O Unused.
35 AUX11 I/O Unused.
36 AUX12 I/O Unused.
38 AUX13 I/O Serial interrupt/CD Mute or control pin.
39 AUX14 I/O Unused.
40 AUX15 I/O Unused.
8,81,83,85
93,95,97,99
DSC D(7~0) I/O Data for programming to access internal registers.
10 DSC S I Strobe for programming to access internal registers.
12 DCLK O Dual purpose pin. DCLK is the MPEG decoder clock.
EXT CLK I EXT CLK is the external clock EXT CLK is an input during bypass PLL mode.
13 RESET B I Video reset (active low).
15 MUTE O Audio mute.
17 MCLK I Audio master clock.
19 TWS I Dual purpose pin. TWS is the transmit audio frame sync.
SPLL OUT O SPLL OUT is the select PLL output.
21 TSD I Transmit audio data input.
22 TBCK I Transmit audio bit clock.
O Dual purpose pin. RWS is the receive audio frame sync.
Pins SEL PLL (1,0) select the PLL clock frequency for the DCLK output.
23 RWS
SEL PLL1 SEL PLL0 DCLK
SEL PLL1
I 0 0 Bypass PLL (input mode)
0 1 27MHz (output mode)
1 0 32.4MHz (output mode)
1 1 40.5MHz (output mode)
24 RSTOUT B O Reset output (active low).
2~4,27~30
76
NC - Unused.
RSD O Dual purpose pin. RSD is the receive audio data input.
33
SEL PLL0 I SEL PLL0 along with SEL PLL1 select the PLL clock frequency for the DCLK output.
37 RBCK O Dual purpose pin. RBCK is the receive audio bit clock.
SER IN I SER IN is the serial input DSC mode.
41,51 AGND I Audio analog ground.
42 VCM I ADC common mode reference (CMR) buffer output.
43 VREFP I DAC and ADC maximum reference.
44 VCCAA I Analog VCC(5V).
45,46 AOR+, AOR- O Right channel output.
47,48 AOL-, AOL+ O Left channel output.
49 MIC1 I Microphone input 1.
50 MIC2 I Microphone input 2.
Port Function of DAC & TV Encoder : ES3889 (ICM3)