Sony MEX-5DI - Display Circuitry

51
4. Car Music Storage Unit
Display Circuitry
Operation
Refer to Figure 4-16. The display circuitry consists of several ICs on the main board to produce text or the
illusion of motion using a changing array of lights on the fluorescent display tube. The purpose of the ICs shown
is listed in table 4-9.
Table 4-9 - Display circuitry IC function - Main board
IC Name Function
IC1010 Central
Processing Unit
(CPU)
Instructs IC5001 to selects the display (text or pattern)
depending upon the mode of operation.
IC3003 Digital Signal
Processor (DSP)
Examines the audio and converts it to a level / frequency
display. Stores display in IC1030 for access by CPU.
IC2001 16M Bit RAM Operating memory for DSP IC3003 processing.
IC2003 CPU Interface CPU to DSP communications Interface
IC1020 64M Bit Flash
Memory
Contains repetitive (stock) display patterns and start up
sequence for the CPU (accessed after reset or pwr ON).
IC1030 128M Bit SD
RAM
Holds display matrix pattern for retrieval by IC5001. Fed
data from DSP & Flash Ram.
IC5001 Display Controller Retrieves display information loaded into RAM IC1030
IC5002 Oscillator High speed Bit clock for IC5001
IC1010
CPU
19
IC2003
CPU/ATA
INTERFACE
IC3003
DSP
IC5001
DISPLAY
CONTROLLER
FL BL
FL DATA
FL LAT
FL CLK
IC5002 OSC.
30
IC800
FL 3.3V
FL ON
ILL ON ILL
48V
1V
4.3V
CN524 PIN OUT
FACEPLATE
FLUOR-
ESCENT
INDICATOR
TUBE
FL900
IC9001
MEM.
STICK
IC4301
USB/
D I/O
MEM.
STICK
D I/O
RESET
FL D
ON
RCQ
ACK
C56
CN524
CN526/3002
19
4
6
8
10
14
25
50
16
17
18
7
5
6
4
8
20
1 1
TO/FROM
IC2003,
IC4001,
IC4301
SUB BD.
MAIN BD.
1. GND.
2. RESET
3. NOSE SW.
4. +4.3V
5. +48V
6. 1V
7. 3.3V
8. 10V (ILL)
9. RE-LB
10. RE-LA
ADDRESS & DATA BUS
11. GND.
12. KEY-GND.
13. RE-RA
14. RE-RB
15. KEY-0
16. FL-BK
17. FL-DATA
18. FL-LAT
19. FL-CLK
20. SIRCS (IR REMOTE IN)
19
FIGURE 4-16 - DISPLAY CIRCUITRY
1
2
4-6A125 1517 11/13/02
IC1030 128M
SD RAM
IC1020
FLASH MEM.
(START &
OPER.)
IC2001
16M RAM