CONTENTS
Page
1. FEATURES................................................................................................... 1
2. SPECIFICATIONS........................................................................................ 1
3. MAC (Memory All Clear) OPERATION.......................................................2
4. DIAGNOSTIC OPERATION ......................................................................... 3
4-1. How to Start ................................................................................................................. 3
4-2. Mode switch and PAD status display check.............................................................4
4-3. Hard key code check .................................................................................................. 4
4-4. Hard check function.................................................................................................... 5
4-4-1. Display, RAM, drawer and printer check ........................................................5
4-4-2. RAM read only check ....................................................................................... 6
4-4-3. Voltage check of memory back-up battery.....................................................6
4-4-4. All characters print check ................................................................................7
4-4-5. Display the time ................................................................................................ 7
4-4-6. How to release the diagnostic mode...............................................................7
5. OPTION CIRCUIT......................................................................................... 8
6. CIRCUIT EXPLANATION............................................................................. 9
6-1. Power supply circuit ................................................................................................... 9
6-2. CPU (µPD75517GF-400-3B9) ....................................................................................11
6-3. Motor error detection circuit .................................................................................... 12
6-4. Mode key switch status read ................................................................................... 13
6-5. RAM address/head drive signal switching circuit..................................................13
6-6. Initialize IC (Reset IC)................................................................................................ 14
6-7. Printer error condition of CPU ................................................................................. 14
6-8. Error code .................................................................................................................. 14
7. TO OPEN THE UPEER CASE ................................................................... 15
8. PCB LAYOUT............................................................................................. 16
9. CIRCUIT DIAGRAM ................................................................................... 17
10. PARTS LIST ............................................................................................... 28
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