CONTENTS
1.
SCHEMATIC DIAGRAM .................................................................................................... 1
1-1. MAIN PCB .................................................................................................................. 1
1-2. KEY MATRIX ............................................................................................................. 2
2.
SPECIFICATIONS ............................................................................................................. 3
3.
TO REPLACE THE BATTERIES....................................................................................... 5
4.
DATA TRANSFER ............................................................................................................. 6
5.
OPERATION REFERENCE ............................................................................................. 10
5-1. RESET OPERATION ............................................................................................... 10
5-2. TO ADJUST THE DISPLAY CONTRAST ............................................................... 11
5-3. TO CHECK THE MEMORY STATUS ...................................................................... 11
5-4. THE SOUND MENU ................................................................................................. 11
6.
LSI, IC (Pin function) ...................................................................................................... 12
6-1. CPU .......................................................................................................................... 12
6-2. RAM:
µ
PD43256G-101215LL (LSI3) ........................................................................ 13
6-3. VOLTAGE REGULATOR:S-81253SGUP (REG1) .................................................. 14
6-4. VOLTAGE DETECTOR:S-80752AN (DET1) ........................................................... 14
7.
TROUBLESHOOTING ..................................................................................................... 15
8.
HARD CHECK ................................................................................................................. 18
9.
ASSEMBLY VIEW ........................................................................................................... 23
10. PARTS LIST .................................................................................................................... 25
Summary of Contents for SF-4300B
Page 1: ...MAR 1994 R with price SF 4300B LX 588 SF 4300B ...
Page 3: ... 1 1 SCHEMATIC DIAGRAM 1 1 MAIN PCB ...
Page 4: ... 2 1 2 KEY MATRIX ...
Page 27: ...MA0600741A ...
