Composition (Md Section); Microprocessor Periphery Block Diagram; Pin Description Of Md U-Com - Kenwood RXD-M31MD Service Manual

5. Composition (MD section)

5-1 Microprocessor periphery block diagram

(MAIN BOARD: IC401)
Back up power
supply (+5V)
IC501
MD_MUTE
MUTE AND OR
(MAIN u-COM)
uPD78058GC-B20
back up sw
back up voltage detection
1
3
MD SUPPLY VOLTAGE
CHANGE-OVER
TERMINAL
1
MD_RESET
MD-ST
SEARCH LOAD_IN
DRIVE
UNIT
MD
CONTROL
u-COM
RF AMP
• DISPLAY CONTROL
• RF AMP CONTROL
MAIN u-COM
• SIGNAL PROCESSING IC
CONTROL (TUNER)
M30622MA-198FP
• VOLUME, MUTE CONTROL
• INPUT SELECTOR CONTROL
uart
2 rxd
txd
MD u-COM
digital in
2
2
analog L/R in
DSCK DSTB
2 2 analog L/R out
K_DATA MD_DATA
AD / DA
CONVERTER
ENDEC / ATRAC
MD mecha. unit (MDM-98A)
5-2 Pin description of MD u-com : UPD78058GC-B20(MD control board, IC501)
Pin No. Name I/O
1 PDOWN O MDM-98A power down detector.
2 SEARCH O CD search output.
3 LOAD IN I Load switch input.
4 AVSS - A/D power supply(connected to ground).
5 GND - No used.
6 NC - No used.
7 AVREF1 - D/A reference voltage(+5.0V).
8 UART2 I Communiation from main u-com(UART RXD).
9 UART1 O Communiation to main u-com(UART TXD).
10 NC - No used.
11 MD DATA I MD IC input data(MDM-98A input data).
12 K DATA O MD IC output data(MDM-98A output data).
13 DSCK O MD IC clock output(MDM-98A).
14 DSTB I Strobe input for MD IC(MDM-98A).
15 COMM ANS I No used.
16 COMM DIN I No used.
17 COMM DOUT O No used.
18 COMM CLK I/O No used.
19 COMM REQ O No used.
20~31 - - No used.
32 6.5/5.0V O Change- over of load voltage for MD unit.
33 VSS - Ground.
34~43 - - No used.
44 INISW I Initial switch input.
45~52 - - No used.
53~55 GND - No used.
56~58 NC - No used.
59 SRESET O No used.
60 RESET I Reset signal input.
61 GND - No used.
62~66 - - No used.
67 CE I Detection signal input of AC OFF.
68 VDD - U-com power supply.
69 X2 - 5MHz oscillator.
70 X1 I 5MHz oscillator.
71 IC - No used.
72 NC - No used.
73 GND - No used.
74 AVDD - A/D power supply.
75 AVREFO I A/D reference voltage.
Detection signal(A/D) input for back up.
76 BACKUP O
(back up : more than 2.2V no back up : less than 2.2V
77 AMUTE O Analog signal input.
Detection switch input for back up.
78 BACKSW O
H : on(in case of CE=H)
79 MD RESET O Reset signal input of MD u-com.
80 MD ST O ST-ID output(MD ON).
6. Test mode
6-1 Test mode of the receiver
(1) Setting of the test mode.
While pressing the [Band] key, plug the AC power cord into an AC power outlet.
(2) Canceling of the test mode.
Unplug an AC power cord.
(3) Condition in test mode.
POWER • • • • • • ON
SELECTOR • • • TUNER [BAND]
FL, LED • • • • • • All the fluorescent display indicate and LEDs light. (The all illuminated state is cleared by pressing any main
unit key or remocon key.
EX. BASS • • • • • OFF
Description
(disc load/eject : H other : L)
H : mute on L : mute off
L :off(in case of CE =L)
H : normal L : MD u-com reset