Samsung ML 1710 Service Manual - Page 34

HVPSHigh Voltage Power Supply

Get Samsung ML 1710 - B/W Laser Printer PDF manuals and user guides View all Samsung ML 1710 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 34 highlights

S U M M A RY OF PRO D U C T 4.5.1 HVPS(High Voltage Power Supply) 1) Transfer High Voltage (THV+) - Function: It is a voltage to transfer a toner developed on OPC drum to a paper. - Output voltage: Maximum +5.0KV ±5% (Duty changeable, unload) - 1.0KV ±15%(When cleaning, 200MOhm) - Error: If THV (+) doesn't output, a ghost status (same character is printed after one cycle (76mm) of OPC) with a low density occurs due to a toner on OPC drum cannot normally transfer to a paper. 2) Charge Voltage (MHV) - Function: It is a voltage to charge entire surface of OPC with -900V ~ -1000V. - Output voltage: -1.3KV ~ 1.8KV DC ±50V - Error: If MHV doesn't output, a black paper is printed out because toner on developing roller moves to OPC drum due to the surface of OPC is not charged. 3)Cleaning Voltage (THV-) - Function: It removes a dirty on a surface by sending a minus toner in a transfer roller to an OPC drum to recover toners. - Output Voltage: There is no feedback control, so change range of output is big up to load. - Error: Toner contamination occurs at a backside of a printed-paper. 4) Developing Voltage (DEV) - Function: It is a voltage to develop a toner with using a difference of electronic potential on an exposed part by LSU (Laser Scanning Unit). * Generally, the electronic potential of exposed OPC is -180V and exposed developer is -350V when printing, so toner with minus (-) is developed on an exposed part. - Output voltage: -200V ~ 600V DC ±20V - Error: 1. If DEV is GND, a density is going significantly down. 2. If DEV is floating due to instable contacting point of terminal, and etc., a density is significantly going up. 5) Supply Voltage(SUP) - Function: It is a voltage to supply toner to a developing roller. - Output voltage: : -400V ~ 800V DC °æ 50V(Use ZENER, DEV gear) - Error: 1. If SUP is GND, a density is dramatically going down. 2. If SUP is floating due to instable contacting point of terminal, and etc., a density is significantly going down as much as it cannot be recognized with eyes. Samsung Electronics Service Manual 4-17

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
4-17
Samsung Electronics
SUMMARY OF PRODUCT
Service Manual
4.5.1 HVPS(High Voltage Power Supply)
1) Transfer High Voltage (THV+)
- Function: It is a voltage to transfer a toner developed on OPC drum to a paper.
- Output voltage: Maximum +5.0KV ±5% (Duty changeable, unload)
- 1.0KV ±15%(When cleaning, 200MOhm)
- Error: If THV (+) doesn't output, a ghost status (same character is printed after one cycle (76mm)
of OPC) with a low density occurs due to a toner on OPC drum cannot normally transfer to a
paper.
2) Charge Voltage (MHV)
- Function: It is a voltage to charge entire surface of OPC with -900V ~ -1000V.
- Output voltage: -1.3KV ~ 1.8KV DC ±50V
- Error: If MHV doesn't output, a black paper is printed out because toner on developing roller
moves to OPC drum due to the surface of OPC is not charged.
3)Cleaning Voltage (THV-)
- Function: It removes a dirty on a surface by sending a minus toner in a transfer roller to an OPC
drum to recover toners.
- Output Voltage: There is no feedback control, so change range of output is big up to load.
- Error: Toner contamination occurs at a backside of a printed-paper.
4) Developing Voltage (DEV)
- Function: It is a voltage to develop a toner with using a difference of electronic potential on an
exposed part by LSU (Laser Scanning Unit).
* Generally, the electronic potential of exposed OPC is -180V and exposed developer is -350V
when printing, so toner with minus (-) is developed on an exposed part.
- Output voltage: -200V ~ 600V DC ±20V
- Error: 1. If DEV is GND, a density is going significantly down.
2. If DEV is floating due to instable contacting point of terminal, and etc., a density is signif-
icantly going up.
5) Supply Voltage(SUP)
- Function: It is a voltage to supply toner to a developing roller.
- Output voltage: : -400V ~ 800V DC °æ 50V(Use ZENER, DEV gear)
- Error: 1. If SUP is GND, a density is dramatically going down.
2. If SUP is floating due to instable contacting point of terminal, and etc., a density is signif-
icantly going down as much as it cannot be recognized with eyes.