Canon PC300 Service Manual page 27

CHAPTER 3
_OPERATIONS AND TIMING _
In outline diagrams, -y4 ~represents mechanical drive paths, and ——>- indicates
electrical signal paths. The drum takes 2.4 sec to complete a single rotation.
Signals in digital circuits are identified as '1' for High and '0' for Low. The voltage
of signals, however, depends on the circuit.
nal workings of the processor are not relevant to the serviceman's work and, therefore, |
are left out of the discussions. By the same token, no repairs are prescribed for the |
PCBs at the user's premises; for this reason, PCBs are discussed by means of block |
diagrams rather than circuit diagrams.
For the purpose of explanation, discussions are divided into the following: from |
sensors to DC controller PCB input ports; from DC controller output ee to laa 1
and minor control circuits and functions.
|. BASIC OPERATIONS .........-..25.::. 3-1 V. POWER SUPPLY ..2...cscecssssseces 3-43
ll. -EXPOSURE/COPYBOARD Vi. STANDARDS AND
DRIVE SYSTEM.......--sssccsesenseesess 3-10 ADJUSTMENTS. 1... ccecccccesesssesnee 3-45
Ill. IMAGE FORMATION SYSTEM... 3-15 Vil. SELF DIAGNOSIS savesiugetesoenasts ae 849
IV. PICK-UP/FEEDING SYSTEM... 3-31
COPYRIGHT ©: 1904 CANON INC. CANON Posonaawses, FOz10230 REVO JULY 1994 PRINTED IN JAPAN (MPRINE AU JAPON)
Nearly all operations of the product are controlled by a microprocessor; the inter- S .