Microcomputer's Terminal Description - Kenwood KDC-135 Service Manual

KDC-135/135CR/136
Ref. No. Application / Function
IC6 4ch BTL Driver
Q1 A8V SW
Q2 Q1 SW
Q3 5V-3.3V Level Shift
Q4 5V-3.3V Level Shift
Q6 BU3.3V SW
Q7 APC (Auto Power Control)
Q8 Power Supply Control
Q9 Power Supply Control
D1,2 5V Force Voltage Prevention
D3 Laser Diode Protection
D4 Static Electricity Countermeasure

MICROCOMPUTER'S TERMINAL DESCRIPTION

SYSTEM µ-COM: IC1 on X34- (ELECTRIC UNIT)
Pin No. Pin Name
1 LX DATA M
2 LX CLK
3~5 NC
6 REMO
7 NC
8 BYTE
9 CNVSS
10 XCIN
11 XCOUT
12 RESET
13 XOUT
14 VSS
15 XIN
16 VCC1
17 NMI
18 PANEL DET
4
COMPONENTS DESCRIPTION
Focusing and tracking coil, sled and spindle motor driver, disc loading and eject operation.
Q1 is ON when Q2 is ON.
Q2 is ON when Q6 is ON.
Shifts 5V to 3.3V, or 3.3V to 5V.
Shifts 3.3V to 5V.
Q6 is ON when Q8 or Q9 is ON.
Drives LD (Laser Diode).
Power Supply Control from MECHA µ-COM. Q6 is ON when pin 63 (P_ON1) of IC1 is Hi.
Power Supply Control from system µ-COM. Q6 is ON when pin 125 (MSTOP) of IC1 is Hi.
5V Force Voltage Prevention from MECHA µ-COM side.
Prevents reverse bias which is applied to laser. Laser destruction prevention.
Prevents malfunction by static electricity.
I/O Application
I/O Data to slave unit
I/O LX-BUS clock
- Not used
I Remote control signal input
- Not used
I Memory extended bus width setting
-
- 32.768kHz
- 32.768kHz
-
- 10.0MHz
-
- 10.0MHz
-
I
I Panel communication detection
Operation / Condition / Compatibility
Truth Value
Processing Operation Description
Table
Pull-down (GND)
125k~65kHz
Output Lo fixed
Detects pulse width
Output L fixed
Connects to VSS
Connects to VSS
L: Reset
Connects to VSS
H: Panel detached, L: Panel attached