Lexmark C736 Service Manual

Connector locations5-3
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System board listing 
See “System board diagram” on page 5-2.
ConnectorPin # SignalPin # Signal
J5
Internal Service Port (ISP)
1Ground
2 USBOUT+
3 USBOUT-
4Ground
5 USBIN+
6 USBIN-
7Ground
8A0
9 RESET
10 +5 V dc
11 I2C_DAT
12 +5 V dc
13 I2C_CLK
14 +5 V dc
J10
Network
1 D_PHY_TX+
2 D_PHY_TX-
3 D_PHY_RD+
4 V_ANA2.5
5 V_ANA2.5
6 D_PHY_RD
7NC
8 V_BOBSMITH
9 +2.5V_PHY_I
10 PHYLED0
11 +2.5V_PHY_I
12 PHYLED1
10A PHYLED0
11A +2.5V_PHY_I
12A PHYLED1
9A...

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JBLW1
Cartridge blower1 S_BLOW_FG
2 V18_BLOW_RTN
3 BLT_BLOW_FB
JBOOT1
0
1 +3.3 V dc
2 +3.3 V dc or Ground
JBOR1
COD BCD motor
1 V24_BOR-
2 V24_BOR+
JCARTP1
Cartridge 1/fuser motors
1 V48_CART1_WIND_W
2 V48_CART1_WIND_V
3 V48_CART1_WIND_U
4 V24_FUSER2_W
5 V24_FUSER2_V
6 V24_FUSER2_U
JCARTP2
Cartridge 2/cartridge 3 motors
1 V48_CART3_WIND_W
2 V48_CART3_WIND_V
3 V48_CART3_WIND_U
4 V48_CART2_WIND_W
5 V48_CART2_WIND_V
6 V48_CART2_WIND_U
JCARTS1
cartridge 1/fuser...

Connector locations5-5
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JCFT1
Functional tester I/F1 CFT1
2 CFT2
3Ground
4 CFT3
5 CFT4
6Ground
7 CFT5
8 CFT6
JCONF1
0
H Model only
1 PLL_CFG1
2 +1.8 V dc
3 PLL_CFG2
JCVR1
Cover open switch (25v)
1 V48_25V_CVR
2 V48_25VD_CVR
JDVR1
TBM stepper/door cam driver
1 +25VE2 +25VE
3 +5V_FUSED4Ground
5 +3.3V_ENG6 GD_TBM_DIR
7 GD_TBM_RESET8 GD_TBM_ENABLE
9 GD_TBM_REF_CLK10 Ground
11 GD_TBM_PWM12 GD_TBM_STEP_MODE
13 GD_DOOR_CAM_PWM14 GD_DOOR_CAM_DIR
15 GD_CAM_CURR_SNS16 Ground
17...

5-6Service Manual 5026  
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JFDS1
Feed thru sensor1 VS12_FDS
2 S_FDS_FB
3Ground
JFMUSB1
Front panel USB port
1Ground
2 USB_DM1
3 USB_DP1
4NC
5Ground
JFUSER1
Belt, exit, bubble sensors
1 S_FSR_BLT2_SNS2 GD_FSR_BLT1_RTN
3 VS_BUB_LED4 S_FSR_BUB_SNSD
5Ground6Ground
7 S_FSR_EXIT_SNSD8 VS_EXIT_LED
9 S_FSR_BLT1_SNS10 GD_FSR_BLT1_RTN
JHVPS1
High-voltage power supply
1Ground2 +25VD
3 C-DEVPWM4 M-DEVPWM
5 Y-DEVPWM6 K-DEVPWM
7Ground8 +5V_SW
9TONER_C10 TONER_M
11 TONER_Y12 TONER_K
13...

Connector locations5-7
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JMIRR1
Mirror motor1MM_REFR
2 TG_MM_LOCK
3 TG_MM_START
4Ground
5 +25VC
JOPP1
Operator panel (12C)
1I2C_DATA
2 V12_PANEL+5V
3 I2C_CLK
4Ground
5 TG_OP_IRQ-
6 +3.3 V dc
7Ground
JOPT1
Option port
1 +25VE2Ground
3 S_OPT_RXR4Ground
5 S_INPUT_FDT6 VS24_OPT_5V
7Ground8 S_OPT_TXR
System board listing  (continued)
See “System board diagram” on page 5-2.
ConnectorPin # SignalPin # Signal 

5-8Service Manual 5026  
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JPH1
Printhead1 VDO_SYNC_C
2 VDO_PHR_OK
3 VDO_SYNC_B
4 VDO_LENA
5 TG_VDO_SHADE_D
6 VS12_+3.3VPH
7 TG_VDO_SHADE_C
8 VS12_JPH1
9 TG_VDO_SHADE_B
10 VS12_JPH1
11 TG_VDO_SHADE_A
12 Ground
13 D_VDO_D2+
14 D_VDO_D2-
15 Ground
16 D_VDO_D+
17 D_VDO_D-
18 Ground
19 D_VDO_C2+
20 D_VDO_C2-
21 Ground
22 D_VDO_C+
23 D_VDO_C-
24 Ground
25 D_VDO_B2+
26 D_VDO_B3-
27 Ground
28 D_VDO_B+
29 D_VDO_B-
30 Ground
31 D_VDO_A2+
32 D_VDO_A2-
33 Ground
34 D_VDO_A+
System board listing...

Connector locations5-9
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JPH1
Printhead
(continued)35 D_VDO_A-
36 Ground
37 I2C_CLK_PH
38 TG_VDO_LADJ_CD
39 I2C_DATA_PH
40 TG_VDO_LADJ_AB
JSB1
Cartridge SB
1 S_SB_Y
2Ground
3 S_SB_C
4Ground
5 S_SB_M
6Ground
7 S_SB_K
8Ground
JSEC1
Security jumper
1V2
2Ground
3Ground
JT1
Test Connector
1Ground
2Ground
JT12
Manual Reset
1 MAX811_MR_
2Ground
JTDBUG1
Debug
1 GD_DEBUG
2Ground
JTLBT1
LB trace port
1Ground
2TG_WF_RXD
3TG_WF_TXD
4 +5 V dc or Ground
JTPS1
Toner Patch Sensor
1 V12_LED_ON2...

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JTWF1
Winflex serial port (engine)1Ground
2 TG_RXD1
3TG_TXD1
4 +5 V dc or Ground
JUSB1
USB device port
1 USB_DEV_VBUS_R
2 USB_DEVD-
3 USB_DEVD+
4Ground
G1 Ground
G2 Ground
System board listing  (continued)
See “System board diagram” on page 5-2.
ConnectorPin # SignalPin # Signal 

Preventive maintenance6-1
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6.  Preventive maintenance
This chapter describes procedures for printer preventive maintenance. Follow these recommendations to help 
prevent problems and maintain optimum performance.
Safety inspection guide
The purpose of this inspection guide is to aid you in identifying unsafe conditions.
If any unsafe conditions exist, find out how serious the hazard could be and if you can continue before you 
correct the hazard.
Check the following items:...

6-2Service Manual 5026  
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Cleaning the printhead lenses
Clean the printhead lenses when you encounter print quality problems.
1.Open the front access door.
Warning:  Potential Damage: To avoid overexposing the photoconductor units, do not leave the front door 
open for more than 10 minutes.
2.Remove all four toner cartridges. Do not remove the photoconductor units for this procedure.
3.Locate the four printhead lenses.
4.Clean the lenses using a can of compressed air.
Warning:...