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CONTENTS

PCR365A/CE-250/CE-200 Page

1.SPECIFICATIONS........................................................................................1

2.INITIALIZE (MAC) OPERATION..................................................................2

3.BLOCK DIAGRAM.......................................................................................3

3-1.PCB CONNECTION.....................................................................................................3

3-1.BLOCK DIAGRAM.......................................................................................................4

4.DISASSEMBLY............................................................................................5

5.CIRCUIT EXPLANATION............................................................................7

5-1.Power supply circuit..................................................................................................7

5-2.CPU (uPD78052GC-159-3B9).....................................................................................8

5-3.Display controller (uPD16312GB-3B4)...................................................................10

5-4.Initilize IC (Reset circuit)..........................................................................................11

5-5.Power down detection circuit (PWD)......................................................................11

5-6.Address latch circuit................................................................................................11

5-7.RAM / ROM bank selection circuit..........................................................................12

5-8.Head drive circuit for printer...................................................................................13

5-9.Power supply circuit for display.............................................................................14

6.DIAGNOSTIC OPERATION.......................................................................15

6-1.To start the diagnostic program.............................................................................15

6-2.Check item................................................................................................................15

6-3.Operation of each test..............................................................................................15

6-4.To exit the diagnostic test.......................................................................................20

7.ERROR CODE LIST...................................................................................21

7-1.Operation error code................................................................................................21

7-2.System lock code.....................................................................................................22

8.IC DATA.....................................................................................................23

9.PCB LAYOUT............................................................................................26

10.CIRCUIT DIAGRAM...................................................................................27

11.PARTS LIST...............................................................................................42

Casio CE-250 Service Manual

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