Epson C117001-N Service Manual - Page 150

REPAIR OF THE POWER SUPPLY CIRCUIT, Table 5-4., Board Assembly Main Parts List - dfx fuse

Get Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer PDF manuals and user guides
UPC - 010343816480
View all Epson C117001-N manuals
Add to My Manuals
Save this manual to your list of manuals

Page 150 highlights

DFX-5000+ Service Manual Troubleshooting 5.3 REPAIR OF THE POWER SUPPLY CIRCUIT This section provides detailed troubleshooting methods to isolate components in the power supply or on the main board. This information is for use by servicers who repair to the component level. U.S. servicers repair to the unit level only, and may ignore this section. The table below provides causes, checkpoints, and solutions for different power supply circuit problems. The checkpoints include waveforms for normal operation. By referring to the checkpoints, determine the defective component. Then perform the proper repair. The table provides the following four columns: D Symptom: Cl Cause: D Checkpoint: Ct Solution: Check this column for a list of common printer problems. Use this column to identify possible causes that could produce this symptom. Follow the troubleshooting checks in this column to isolate your problem. Repair the printer using the instructions in this column. Table 5-4. C117 PSB/PSE Board Assembly Main Parts List Location IC151 IC152 (A/B) Q101 Q201 Name TL494 NJM2903 K1 531 K1531 Description PWM switching controller Comparator IC (voltage drop monitor for the two +35 VDC lines) Main switching FET Main switching FET Table 5-5. C117 PSB/PSE Board Assembly Component Repair Symptom No DC voltage is present at the output. Fuse F1 blows immediately after replacement. Cause The VPC signal (HIGH level) is not being sent from the main board. The DRERR signal is HIGH. CLIMIT signal is HIGH. The line filter circuit is defective. Checkpoint Look at the voltage waveform from the gate array on the main board and check the head driver voltage waveform. (Refer to Table 5-6.) Measure the voltage level of the DRERR signal at CN3. Measure the voltage level of the CLIMIT signal at CN3. Check if any of pins C1-C6 or RI is shorting the AC line. Solution Replace the gate array or head driver on the main board. Replace the head driver on the main board. Wait until the printer prints again. Replace the abnormal element. Rev. A 5-13

  • 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
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
DFX-5000+
Service Manual
Troubleshooting
5.3
REPAIR OF THE POWER SUPPLY CIRCUIT
This section provides detailed troubleshooting methods to isolate components in the power supply
or on the main board. This information is for use by servicers who repair to the component level.
U.S. servicers repair to the unit level only, and may ignore this section.
The table below provides causes, checkpoints, and solutions for different power supply circuit
problems. The checkpoints include waveforms for normal operation. By referring to the
checkpoints, determine the defective component. Then perform the proper repair. The table
provides the following four columns:
D
Symptom:
Check this column for a list of common printer problems.
Cl
Cause:
Use this column to identify possible causes that could produce this symptom.
D
Checkpoint:
Follow the troubleshooting checks in this column to isolate your problem.
Ct
Solution:
Repair the printer using the instructions in this column.
Table 5-4.
C117
PSB/PSE
Board Assembly Main Parts List
Location
Name
Description
IC151
TL494
PWM switching controller
IC152
(A/B)
NJM2903
Comparator
IC
(voltage drop monitor for the two +35 VDC lines)
Q101
K1
531
Main switching
FET
Q201
K1531
Main switching
FET
Table 5-5.
C117
PSB/PSE
Board Assembly Component Repair
Symptom
Cause
Checkpoint
Solution
No
DC
voltage
The
VPC signal
Look at the voltage waveform from
Replace the
is present at the
(HIGH level) is not
the gate array on the main board and
gate array or
output.
being sent from the
check the head driver voltage
head driver
main board.
waveform. (Refer to Table 5-6.)
on the main
board.
The
DRERR
signal
Measure the voltage level of the
Replace the
is HIGH.
DRERR
signal at
CN3.
head
driver
on the main
board.
CLIMIT
signal is
Measure the voltage level of the
Wait until the
HIGH.
CLIMIT
signal at
CN3.
printer prints
again.
Fuse
F1
blows
The line filter circuit
Check if any of pins
C1-C6
or RI is
Replace the
immediately
is defective.
shorting the AC line.
abnormal
after
element.
replacement.
Rev.
A
5-13