Service Manual
Page 3
...consisting of a general timing chart and general circuit diagrams. A separate document entitled Service Handbook is also available for troubleshooting problems in the field. CANON PC720174017501770 REV.0 AUG. 1994 PRINTED IN JAPAN omput AU JAPON) CHAPTER 2 "COPYING PROCESS" deals with the inner ...thoroughly familiar with the information contained in this manual, Service Handbook, and Service Information Bulletins, for quick response to the copier; The PC720, PC740, PC750, and PC770 differ from time to time to reflect improvements rendered to the user's needs. Multifeeding (manual) - ...
...consisting of a general timing chart and general circuit diagrams. A separate document entitled Service Handbook is also available for troubleshooting problems in the field. CANON PC720174017501770 REV.0 AUG. 1994 PRINTED IN JAPAN omput AU JAPON) CHAPTER 2 "COPYING PROCESS" deals with the inner ...thoroughly familiar with the information contained in this manual, Service Handbook, and Service Information Bulletins, for quick response to the copier; The PC720, PC740, PC750, and PC770 differ from time to time to reflect improvements rendered to the user's needs. Multifeeding (manual) - ...
Service Manual
Page 36
...assembly does not have a cleaning mechanism. this is monitored by the thermistor (TH1) located more or less at the center of the paper. CANON PC720,740/750i770 REY.0 AUG.1994 PRINTEDIN JAPAN DIARIME AU JAPON) Thin paper, however, has low rigidity and can wrap around the photosensitive drum. The... to weaken the static attraction between the photosensitive drum and copy paper, thereby facilitating separation. MI COPYING PROCESS G. To prevent such a problem, the copier applies a positive voltage to the separation static eliminator to a specific temperature. 2 - 6 COPYRIGHT © 1994...
...assembly does not have a cleaning mechanism. this is monitored by the thermistor (TH1) located more or less at the center of the paper. CANON PC720,740/750i770 REY.0 AUG.1994 PRINTEDIN JAPAN DIARIME AU JAPON) Thin paper, however, has low rigidity and can wrap around the photosensitive drum. The... to weaken the static attraction between the photosensitive drum and copy paper, thereby facilitating separation. MI COPYING PROCESS G. To prevent such a problem, the copier applies a positive voltage to the separation static eliminator to a specific temperature. 2 - 6 COPYRIGHT © 1994...
Service Manual
Page 74
CANON PC720/74750/770 REY.0 AUG.1994 PRINTEDINJAPANpMPRIMEAU JAPON) =OPERATIONS AND TIMING 9) Make one copy, and check if it is free of fogging but the print is noted or the characters are too light, repeat the steps starting with step 1) once again. • If the problem cannot be corrected after going through the steps once again, use the density correction switch (SW101). 0 D SW101 Figure 3-323 3 - 34 COPYRIGHT © 1994 CANON INC. If fogging is dark enough. .
CANON PC720/74750/770 REY.0 AUG.1994 PRINTEDINJAPANpMPRIMEAU JAPON) =OPERATIONS AND TIMING 9) Make one copy, and check if it is free of fogging but the print is noted or the characters are too light, repeat the steps starting with step 1) once again. • If the problem cannot be corrected after going through the steps once again, use the density correction switch (SW101). 0 D SW101 Figure 3-323 3 - 34 COPYRIGHT © 1994 CANON INC. If fogging is dark enough. .
Service Manual
Page 90
...appropriate settings are read by controlling the power supplied to the heater Figure 3-413 0 0 Figure 3-414 3 - 50 COPYRIGHT © 1994 CANON INC. CANON PC120/74017501710 REVS AUG.1994 PRINTED IN JAPAN pipmmt AU JAPONI see Figure 3-414. HTRD 4. Correcting the Variation in the Resistance of the ...heater driver signal (HTRD) so that would hinder proper execution of thermal control of the fixing heater may be supplied; To correct possible problems, the copier compensates for the variations in its phase. do not rearrange the jumper wires. The power to the fixing heater. this...
...appropriate settings are read by controlling the power supplied to the heater Figure 3-413 0 0 Figure 3-414 3 - 50 COPYRIGHT © 1994 CANON INC. CANON PC120/74017501710 REVS AUG.1994 PRINTED IN JAPAN pipmmt AU JAPONI see Figure 3-414. HTRD 4. Correcting the Variation in the Resistance of the ...heater driver signal (HTRD) so that would hinder proper execution of thermal control of the fixing heater may be supplied; To correct possible problems, the copier compensates for the variations in its phase. do not rearrange the jumper wires. The power to the fixing heater. this...
Service Manual
Page 91
...data for a specific period of A4 or small- Thermal Fuse (FU1) If the area around the thermal fuse exceeds 226°C and remains so for problems associated with the heater is detected during copying operation, the copier once again will indicate `E000' through 'E003' on within 5 min, and the ...turn off while 'E000' through E003) on paper of time, the thermal fuse melts to the heater, is backed up and `E0' will be enabled. CANON PC720/740/7501770 REV.() AUG. 1994 PRINTED IN JAPAN piPoit AU JAPAN) 3 - 51 Once changed, the distance between sheets and the sub thermistor (TH2) ...
...data for a specific period of A4 or small- Thermal Fuse (FU1) If the area around the thermal fuse exceeds 226°C and remains so for problems associated with the heater is detected during copying operation, the copier once again will indicate `E000' through 'E003' on within 5 min, and the ...turn off while 'E000' through E003) on paper of time, the thermal fuse melts to the heater, is backed up and `E0' will be enabled. CANON PC720/740/7501770 REV.() AUG. 1994 PRINTED IN JAPAN piPoit AU JAPAN) 3 - 51 Once changed, the distance between sheets and the sub thermistor (TH2) ...
Service Manual
Page 98
...the delivery sensor within a specific period of time because of a feeding problem, the copier identifies a delivery delay jam, stops copying operation, and flashes the Jam message. CANON PC720/740R501770REV.OAUG.1994 PRINTEDIN JAPANDMPRIMEAUJAPON) Delivery Delay Jam If copy paper does ...not reach the delivery sensor within a specific period of time because of a feeding problem, the copier identifies a pick-up delay jam...
...the delivery sensor within a specific period of time because of a feeding problem, the copier identifies a delivery delay jam, stops copying operation, and flashes the Jam message. CANON PC720/740R501770REV.OAUG.1994 PRINTEDIN JAPANDMPRIMEAUJAPON) Delivery Delay Jam If copy paper does ...not reach the delivery sensor within a specific period of time because of a feeding problem, the copier identifies a pick-up delay jam...
Service Manual
Page 111
...E000', `E001', 'E002', or 'E003' has occurred. faulty) • Thermal fuse (FU1; CANON PC720/7401750I770 REVD AUG.1994 PRINTED IN JAPAN (imPRimt AU JAPON) 3 - 71 COPYRIGHT © 1994 CANON INC. melted) • Triac (faulty) • DC controller PCB (faulty) Description •...The thermistor (TH2) temperature fails to reach 65°C in 4 sec after a press on the control panel. H Fixing heater (overheating) EC Problems associated with a microprocessor that checks the state of `E001', `E0' and '01' are flashed alternately. faulty) U.LILOLI • Fixing heater...
...E000', `E001', 'E002', or 'E003' has occurred. faulty) • Thermal fuse (FU1; CANON PC720/7401750I770 REVD AUG.1994 PRINTED IN JAPAN (imPRimt AU JAPON) 3 - 71 COPYRIGHT © 1994 CANON INC. melted) • Triac (faulty) • DC controller PCB (faulty) Description •...The thermistor (TH2) temperature fails to reach 65°C in 4 sec after a press on the control panel. H Fixing heater (overheating) EC Problems associated with a microprocessor that checks the state of `E001', `E0' and '01' are flashed alternately. faulty) U.LILOLI • Fixing heater...
Service Manual
Page 144
...open when the cartridge is inserted into the copier and the copier's top unit is provided to prevent such a problem. the light-blocking shutter is closed. CANON PC72M40/7501170 REV.O AUG.1994 PRINTED IN JAPAN omPnimt AU JAPAN) er are housed in a single container called...shutter Photosensitive drum Cleaning blade Drum cover shutter Developing cylinder Figure 4-501 a. it is removed from such light. 4 - 28 COPYRIGHT 1994 CANON INC. Outline The copier's photosensitive drum, primary charging roller, developing assembly, and clean- Cartridge 1. b. Drum Cover Shutter If the ...
...open when the cartridge is inserted into the copier and the copier's top unit is provided to prevent such a problem. the light-blocking shutter is closed. CANON PC72M40/7501170 REV.O AUG.1994 PRINTED IN JAPAN omPnimt AU JAPAN) er are housed in a single container called...shutter Photosensitive drum Cleaning blade Drum cover shutter Developing cylinder Figure 4-501 a. it is removed from such light. 4 - 28 COPYRIGHT 1994 CANON INC. Outline The copier's photosensitive drum, primary charging roller, developing assembly, and clean- Cartridge 1. b. Drum Cover Shutter If the ...
Service Manual
Page 145
... to avoid exposure. (The direct rays of the sun, in passing, is exposed to the developing cylinder. 2. B. Caution: 1. COPYRIGHT © 1994 CANON INC. Removing the Transfer Charging Roller 1) Open the copier's top unit. 2) Remove the screw T. 1) Open the copier's top body, and remove the...displace the leaf spring used to apply a developing bias to light of the bushing, remove the transfer charging roller ©. 3 LZt- CANON PC720f7401750/710 REV.O AUG.1994 PRINTEDIN JAPAN1IMPRIME AUJAPON) 4 - 29 Transfer corona Assembly 1. The drum must always bp rotated in the opposite...
... to avoid exposure. (The direct rays of the sun, in passing, is exposed to the developing cylinder. 2. B. Caution: 1. COPYRIGHT © 1994 CANON INC. Removing the Transfer Charging Roller 1) Open the copier's top unit. 2) Remove the screw T. 1) Open the copier's top body, and remove the...displace the leaf spring used to apply a developing bias to light of the bushing, remove the transfer charging roller ©. 3 LZt- CANON PC720f7401750/710 REV.O AUG.1994 PRINTEDIN JAPAN1IMPRIME AUJAPON) 4 - 29 Transfer corona Assembly 1. The drum must always bp rotated in the opposite...
Service Manual
Page 165
...f. may leak from the developing assembly or the cleaning assembly. Caution: 1. Do not ever leave it with a flannel cloth coated with a light-blocking shutter. CANON PC720174011501770 REV.0 AUG.1994 PRINTER IN JAPAN (IMPRIME AU JAPONI 6 - 3 Do not subject the cartridge to 30,000 lux.) Figure 6-402 c. Do not stand...open the shutter for a color cartridge, be sure to light of time can still lead to a level that will not cause any practical problems; Keep the cartridge outside of reach of the sun, in both directions several times to the copier or if white spots appear on its...
...f. may leak from the developing assembly or the cleaning assembly. Caution: 1. Do not ever leave it with a flannel cloth coated with a light-blocking shutter. CANON PC720174011501770 REV.0 AUG.1994 PRINTER IN JAPAN (IMPRIME AU JAPONI 6 - 3 Do not subject the cartridge to 30,000 lux.) Figure 6-402 c. Do not stand...open the shutter for a color cartridge, be sure to light of time can still lead to a level that will not cause any practical problems; Keep the cartridge outside of reach of the sun, in both directions several times to the copier or if white spots appear on its...