Kyocera FS-1050 Service Manual - Page 85

Power supply board, Power supply board circuit block diagram

Get Kyocera FS-1050 - B/W Laser Printer PDF manuals and user guides View all Kyocera FS-1050 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 85 highlights

(3) Power supply board The power supply board provides the AC power input and DC power and outputs. The high voltage bias generator circuit is mounted on a separate board. A simplified schematic diagram is shown below. AC input Power Current switch fuse (SW1) (F1) Noise filter circuit Power supply unit Exit sensor Transformer (T1) 24 V DC rectifier/ smoothing circuit 24 V DC shutoff circuit Heater lamp Thermal cutout FET (Q1) Switching/ Over current detection circuit 5 V DC rectifier/ smoothing circuit Photocoupler (PC1) Over voltage detection circuit Triac (TRC1) Photocoupler (PC3) Transistor (Q8) Zero cross signal detection circuit PhotoTriac (PC2) EXITN +24 V COM SLEEP FAN Cooling fan +24 V COM +5 V PGND, SGND THERM Thermistor +24 V ZCROSS HEAT Figure 4-3-8 Power supply board circuit block diagram FS-1050 4-26

  • 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
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
4-26
FS-1050
(3) Power supply board
The power supply board provides the AC power input and DC power and outputs. The high voltage
bias generator circuit is mounted on a separate board. A simplified schematic diagram is shown
below.
Figure 4-3-8 Power supply board circuit block diagram
FET
(Q1)
Switching/
Over
current
detection
circuit
Power
switch
Current
fuse
Noise
filter
circuit
Transformer
(T1)
24 V DC
rectifier/
smooth-
ing circuit
24 V DC
shutoff
circuit
Over voltage
detection
circuit
Photo-
coupler
(PC1)
Photo-
Triac
(PC2)
Triac
(TRC1)
Heater
lamp
AC
input
5 V DC
rectifier/
smooth-
ing circuit
Thermistor
Cooling fan
+24 V COM
+24 V COM
THERM
+24 V
HEAT
EXITN
PGND, SGND
+5 V
FAN
SLEEP
Thermal
cutout
Transistor
(Q8)
ZCROSS
Photo-
coupler
(PC3)
(SW1)
(F1)
Exit
sensor
Zero cross signal
detection circuit
Power supply unit