Service manual

71
HCD-GNZ55D
IC401 M30622MEP-A50FPU0 (SYSTEM CONTROL) (MAIN BOARD (1/4))
Pin No. Pin Name I/O Pin Description
1
SW CHANNEL
O
Signal path selection signal for sub woofer channel
SELECT “L”: LFE, “H”: Subwoofer out from M61537 Not used in this set. (Open)
2
SURR CHANNEL
O
Signal path selection signal for surround channel
SELECT “L”: SL/FR (MTK), “H”: Tone out from M61537 Not used in this set. (Open)
3 SM LATCH 3 O Serial data latch pulse output to the S-Master Processor
4 SIRCS I Remote control signal input
5 NO USE I Not used. (Connect to ground.)
6 NO USE I Not used. (Connect to ground.)
7 NO USE I Not used. (Connect to ground.)
8BYTE — Ground pin
9 CNVSS — Ground pin
10 XC IN I Sub system clock input (32.768 kHz)
11 XC OUT O Sub system clock output (32.768 kHz)
12 RESET I
System reset signal input from the reset signal IC “L”: reset After the power
supply rises, “L” is input for several hundreds msec and then change to “H”.
13 X OUT O Main system clock output (5 MHz)
14 VSS — Ground pin
15 X IN I Main system clock input (5 MHz)
16 VCC — Power supply pin (+3.3 V)
17 NMI I Non-maskable interrupt input
18 NO USE I Not used. (Connect to ground.)
19 NO USE I Not used. (Connect to ground.)
20 AC CUT I AC off detection signal input from the reset signal IC “L”: AC Cut detected
21 VIDEO MUTE O Video muting on/off control signal output “L”: muting on
22 VIDEO OUT SW O
Composite video output switching output control
“L”: DVD VIDEO output, “H”: VIDEO VIDEO input
23 MIC DETECT I Microphone connection detection signal input “L”: headphone connected
24 KRMOD I Karaoke Mode detection signal input
25 MIC STATUS O
Microphone status output to DVD Motherboard
“L”: Microphone is not connected, “H”: Microphone is connected
26 MTK RESET O Reset signal output to DVD Motherboard “L”: reset
27 MTK XIFCS I
Communication Initialization Request Acknowledgement Signal from DVD
Motherboard
28 MTK BUSY O Communication Initialization Request Signal to DVD Motherboard
29 IIC CLK I/O Clock signal for IIC communication between the microcomputer and the IIC checker
30 IIC DATA I/O Data signal for IIC communication between the microcomputer and the IIC checker
31 MTK SIO O Serial data output signal to DVD Motherboard
32 MTK SOD I Serial data input signal from DVD Motherboard
33 MTK CLK I Serial data clock signal to DVD Motherboard
34 DVD A MUTE O DVD analog signal muting on/off control signal output “H”: muting on
35 MTK POWER O Power supply control signal to DVD Motherboard “H”: Power supply on
36 ST CE O PLL chip enable signal output to the tuner unit
37 MC DIN I PLL serial data input from the tuner unit
38 ST CLK O PLL serial data transfer clock signal output to the tuner unit
39 MC DOUT O PLL serial data output to the tuner unit
40 TUNED I Tuning detection signal input from the tuner unit “L”: tuned
41 OPEN SW I Eject detection signal input from CDM
42 TBL SENSE I Disc tray position detection signal input from CDM
43 E3 I Disc tray status detection signal input from CDM
44 E2 I Disc tray status detection signal input from CDM
45 E1 I Disc tray status detection signal input from CDM
46 TM F O CDM turning motor control signal output