Lexmark C 950 Service Manual

Repair information 4-387
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3.Release the hooks securing the sensor (HCF unit docking interlock) (A) to the unit. 
4.Remove the sensor (HCF unit docking interlock) (A). 
Sensor (HCF top door interlock) removal 
1.Remove the HCF unit to the printer.
2.Open the HCF top door assembly. 
3.Disconnect the connector from the sensor (HCF top door interlock) (A). 
4.Remove the two screws securing the bracket (B) to the unit. 
5.Remove the bracket (B). 
Hook
A Front
Hook
Connectors 

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6.Release the hooks securing the sensor (HCF top door interlock) (A) to the bracket (B). 
7.Remove the sensor (HCF top door interlock) (A). 
Sensor (tray 5 media level) removal 
1.Open the HCF top door. 
2.Open the HCF feed unit assembly. 
3.Disconnect the connector from the sensor (tray 5 media level) (A). 
A
B
Connector 

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4.Release the hooks securing the sensor (tray 5 media level) (A) from the HCF feed unit assembly (B). 
5.Remove the sensor (tray 5 media level) (A). 
Sensor (tray 5 media out) removal 
1.Open the HCF top door. 
2.Open the HCF feed unit assembly. 
3.Remove the connector from the sensor (tray 5 media out) (A). 
A
B
Front
Connector 

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4.Release the hooks securing the sensor (tray 5 media out) (A) to the HCF feed unit assembly (B).
5.Remove the sensor (tray 5 media out) (A). 
Note:  The sensor (tray 5 media out) (A) may be easier to replace if the upper guide (C) is removed to 
provide access. 
Sensor (tray 5 pre feed) removal 
1.Open the HCF top door. 
2.Open the HCF feed unit assembly. 
3.Remove the three screws securing the upper guide (A) to the HCF feed unit assembly (B)....

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6.Remove the one screw securing the sensor (tray 5 pre feed) (C) to the HCF feed unit assembly (B). 
7.Remove sensor (tray 5 pre feed) (C). 
A
C
B
Connector 

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Setup and adjustments
Sensor (ATC) setup
Warning:  This procedure must be done for all new developer housings being installed or print quality problems 
may occur.
Note:  This procedure is applicable only to firmware versions LHS2.TP.P244a and above. Before re-installing 
the new developers, make sure the latest firmware is installed on the device.
1Before installing any new developer housings in the machine, record the barcode number located on 
the...

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5Warning:  The following step must be performed, or the new machine settings will not match the 
settings listed on the birth certificate if it is required for NVM value replacement.
Retrieve the birth certificate from the compartment (1) in the media tray 1.
Using the the same Coefficient and Offset NVM values taken from step 2, overwrite the following 
settings found on the birth certificate:
• ATC Setup Coefficient for Y
• ATC Setup Coefficient...

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12 1321 -121
13 1204 -63
14 1107 -16
15 1024 25
16 952 60
17 890 91
18 835 118
19 787 141
20 1638 -286
21 1462 -199
22 1321 -129
23 1204 -71
24 1107 -23
25 1024 19
26 952 54
27 890 85
28 835 112
29 787 136
30 1638 -296
31 1462 -208
32 1321 -137
33 1204 -78
34 1107 -29
35 1024 12
36 952 49
37 890 80
38 835 107
39 787 132
40 1638 -306
41 1462 -217
42 1321 -145
ATC value conversion chart
Barcode number 
(last 2 digits)ATC Setup Coefficient ValueATC...

Repair information 4-395
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43 1204 -85
44 1107 -36
45 1024 6
46 952 43
47 890 74
48 835 102
49 787 127
50 1638 -316
51 1462 -225
52 1321 -153
53 1204 -93
54 1107 -43
55 1024 0
56 952 37
57 890 69
58 835 97
59 787 122
60 1638 -326
61 1462 -234
62 1321 -161
63 1204 -100
64 1107 -49
65 1024 -6
66 952 31
67 890 64
68 835 92
69 787 117
70 1638 -336
71 1462 -243
72 1321 -169
73 1204 -107
ATC value conversion chart
Barcode number 
(last 2 digits)ATC Setup Coefficient ValueATC...

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74 1107 -56
75 1024 -12
76 952 26
77 890 58
78 835 87
79 787 112
80 1638 -346
81 1462 -252
82 1321 -177
83 1204 -114
84 1107 -63
85 1024 -19
86 952 20
87 890 53
88 835 82
89 787 108
90 1638 -356
91 1462 -261
92 1321 -185
93 1204 -122
94 1107 -70
95 1024 -25
96 952 14
97 890 47
98 835 77
99 787 103
ATC value conversion chart
Barcode number 
(last 2 digits)ATC Setup Coefficient ValueATC Setup Offset Value