Kenwood KD CW 311 AY Service Manual

Page 5

KDC-W237AY/W237GY/W3037AY/W3037GY/
W31 1AY/W31 1GY/W3537AY/W3537GY/W4037Y

COMPONENTS DESCRIPTION

Ref. No. Application / Function Operation / Condition / Compatibility
ICB D3.3V REG. Power supply for digital 3.3V.
IC7 A3.3V REG. Power supply for audio 3.3V.
IC11 BU1.5V REG. Power supply for back-up 1.5V.
Q1 APC (Auto Power Control) Drives LD (Laser Diode).
Q10~12 5V-3.3V Level Shift Converts signal from 5V to 3.3V, or from 3.3V to 5V.
Q13 Inverter Inverts ZDET signal.
Lowers signal level by about 1.2V so that L0 level signal that turns the regulator ON/OFF
D1 Level Down
surely becomes Lo judgment level of the regulator SW.
D2 Laser Diode Protection Prevents reverse bias which is applied to laser. Laser destruction prevention.
D3,4 Static Electricity Countermeasure Prevents malfunction by static electricity.

MICROCOMPUTERS TERMINAL DESCRIPTION

0 SYSTEM u-COM: IC1 on X34- (ELECTRIC UNIT)

Pin No. Pin Name l/O Application 3:2 Processing Operation Description
1 LX DATA M I/O Data to slave unit Pull-down (GND)

2 LX CLK I/O LX-BUS clock 125k~65kHZ

3~5 NC - Not used Output Lo fixed

6 REMO I Remote control signal input Detects pulse width

7 NC - Not used Output L fixed

8 BYTE I Memory extended bus width setting Connects to V88

9 CNVSS - Connects to V88

10 XCIN - 32.768kHZ

11 XCOUT - 32.768kHZ

12 REE - L: Reset

13 XOUT - 10.0MHZ

14 V88 -

15 XIN - 10.0MHZ

16 VCC1 -

17 NMI I Connects to V88

18 m I Panel communication detection H: Panel detached, L: Panel attached
19,20 NC - Not used Output L fixed

21 ROMCOR DET I E2PROM writing request H:Writing

22,23 NC - Not used Output L fixed