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5.2.2.1 Paper path selection mechanism (HCPP)......................................................................123
5.2.2.2 Paper feed operation .....................................................................................................125
5.2.2.3 Paper loading and ejection operation (auto loading)......................................................128
5.3 Electrical Operation.....................................................................................................................129
5.3.1 Printed Circuit Boards and Basic Configuration....................................................................129
5.3.1.1 Outline of Printed Circuit Boards....................................................................................130
5.3.2 Control Circuit Operation......................................................................................................134
5.3.2.1 Printer Special Controller (MB90706) ............................................................................134
5.3.2.2 Memory Circuit Control ..................................................................................................135
5.3.2.3 Centronics Controller .....................................................................................................137
5.3.2.4 The MPU(MB89P585) has the following main functions ................................................139
5.3.2.5 LAN interface .................................................................................................................140
5.3.3 Head Control LSI (MBCG46183-520PF) ..............................................................................141
5.3.4 Motor Control LSI (MBCG46183-525PFV) ...........................................................................142
5.3.5 Control Panel Control ...........................................................................................................143
5.3.6 Motor Control and Drivers ....................................................................................................144
5.3.7 Print Head Driver..................................................................................................................149
5.3.8 Alarms ..................................................................................................................................151
5.3.8.1 Fire Check .....................................................................................................................151
5.3.8.2 ROM or RAM Error ........................................................................................................151
5.3.8.3 Spacing Error .................................................................................................................151
5.3.8.4 APTC Gap Alarm ...........................................................................................................151
5.3.8.5 HCPP Alarm...................................................................................................................151
5.3.8.6 Skew Unit Error..............................................................................................................151
5.3.9. Power Supply ......................................................................................................................152
5.3.9.1 +5 V Switching Regulator ..............................................................................................152
5.3.9.2 +34 Switching Regulator................................................................................................152
5.3.10 Surge Current Controller ....................................................................................................154
CHAPTER 6 RECOMMENDED SPARE PARTS ...............................................................................155
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