This manual may contain technical inaccuracies or typographica l errors due to improvements or changes in products. When changes occur in applicable products or in the contents of this manual, Canon will release technical information as the need arises. In the event of major changes in the contents of this manual over a long or short period, Canon will issue a new edition of this manual.
The following paragraph does not apply to any countries where such provisions are inconsistent with local law. The following rules apply throughout this Service Manual: 1. Each chapte r contains sectio ns explaining the purpose of specic funct ions and the relationship between electrical and mechanical systems with reference to the timing of operation. In the diagrams, represents the path of mechanical drive; where a signal name accompanie s the symbol, the arrow indicates the direction of the electric signal.
The expression 'turn on the power' means ipping on the power switch, closing the front door, and closing the delivery unit door, which results in supplying the machine with power. In the digita l circuits, '1' is use d to indicate t hat the volta ge level of a given signal is 'High', while '0' is used to indicate 'Low'. (The voltage value, however, differs from circuit to circuit.) In addition, the asterisk (.) as in 'DRMD.' indicates that the DRMD signal goes on when '0'. In pra ctically all cases, the in ternal m echanisms of a microprocessor cannot be ch ecked in the eld. Therefore, the operations of the microprocessors used in the machines are not discussed: they are explained in terms of from sensors to the input of the DC controller PCB and from the output of the DC controller PCB to the loads.
The descriptions in this Service Manual are subject to change without notice for product improvemen t or other purposes, and major changes will be communicated in the form of Service Information bulletins. All service person s are expecte d to have a good unde rstanding of th e contents o f this Service Manual and all relevant Service Information bulletins and be able to identify and isolate faults in the machine.
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