Lexmark E352DN Service Manual - Page 40

Cooling fan service check, Cover interlock switch service check

Get Lexmark E352DN - E 352dn B/W Laser Printer PDF manuals and user guides View all Lexmark E352DN manuals
Add to My Manuals
Save this manual to your list of manuals

Page 40 highlights

4512-420, -430 Controller card service check (Continued) FRU LVPS/HVPS Action Verify main power to controller card With the printer off, unplug the LPS/HVPS cable at J19 on the controller card. Verify grounds on pins 7, 12, and 14 for both the cable and the controller card. If any of these grounds are incorrect, check the cable for continuity. Replace the cable or the respective card as necessary. Turn the printer on with the cable still unplugged, and verify the following on the cable (controller card will not be powered): Pins Voltage J19-8 +24 V dc J19-9 +24 V dc J19-13 +5 V dc If any of the voltages are incorrect, replace the LVPS/HVPS. See "Dead machine service check" on page 2-19. Cooling fan service check FRU Cooling fan Action Make sure the fan cable plug is properly seated at J4 (controller card). Turn the printer off, and disconnect the cooling fan cable from the controller card. Turn the printer on. Within a few seconds, the controller card assembly should apply +24 V dc to pin 2. • If voltage is present and the fan is not turning, replace the cooling fan. If the fan still doesn't function, replace the controller card. • If voltage is not present, check the controller card. Cover interlock switch service check Note: Make sure a print cartridge assembly is installed and the cover closes all the way, engaging the cover open switch lever. FRU Cover interlock switch Action Disconnect the cover interlock cable from the controller card at J6. With the printer turned off, verify continuity between cable pin 1 and pin 2 with the door closed and discontinuity with the door open. Verify continuity between cable pin 1 and pin 3 with the door open and discontinuity with the door closed. Verify discontinuity between cable pins 2 and 3 whether the door is open or closed. • If either fails, replace the cover interlock switch. • If both pass continuity, turn the printer on, and measure +5 V dc on pin 2 at J6 on the controller card. • Verify pin 3 at J6 is ground. • If voltage or ground is not present, see "Controller card service check" on page 2-17 for more information. 2-18 Lexmark™ E350d, E352dn

  • 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
2-18
Lexmark™ E350d, E352dn
4512-420, -430
Cooling fan service check
Cover interlock switch service check
Note:
Make sure a print cartridge assembly is installed and the cover closes all the way, engaging the cover
open switch lever.
LVPS/HVPS
Verify main power to controller card
With the printer off, unplug the LPS/HVPS cable at J19 on the controller card. Verify
grounds on pins 7, 12, and 14 for both the cable and the controller card. If any of these
grounds are incorrect, check the cable for continuity. Replace the cable or the respective
card as necessary.
Turn the printer on with the cable still unplugged, and verify the following on the cable
(controller card will not be powered):
If any of the voltages are incorrect, replace the LVPS/HVPS. See
“Dead machine service
check” on page 2-19
.
FRU
Action
Cooling fan
Make sure the fan cable plug is properly seated at J4 (controller card).
Turn the printer off, and disconnect the cooling fan cable from the controller card.
Turn the printer on. Within a few seconds, the controller card assembly should apply
+24 V dc to pin 2.
•
If voltage is present and the fan is not turning, replace the cooling fan. If the fan still
doesn’t function, replace the controller card.
•
If voltage is not present, check the controller card.
FRU
Action
Cover interlock switch
Disconnect the cover interlock cable from the controller card at J6.
With the printer turned off, verify continuity between cable pin 1 and pin 2 with the door
closed and discontinuity with the door open.
Verify continuity between cable pin 1 and pin 3 with the door open and discontinuity with the
door closed.
Verify discontinuity between cable pins 2 and 3 whether the door is open or closed.
•
If either fails, replace the cover interlock switch.
•
If both pass continuity, turn the printer on, and measure +5 V dc on pin 2 at J6 on the
controller card.
•
Verify pin 3 at J6 is ground.
•
If voltage or ground is not present, see
“Controller card service check” on page 2-17
for more information.
Controller card service check (Continued)
FRU
Action
Pins
Voltage
J19-8
+24 V dc
J19-9
+24 V dc
J19-13
+5 V dc