Lexmark C750 Service Manual - Page 167

Lexmark C750 Manual

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5060-00x Step 7 Action and questions RIP board-measure the voltage at connector J1-2 on the RIP board. See "RIP board" on page 5-14. The voltage measures approximately +5 V dc. Is the voltage correct? Yes Replace the operator panel. See "Operator panel removal" on page 4-46 Go to step 9 No Go to step 8 8 Operator panel cable (operator panel connection)- make sure the operator panel cable is seated correctly in the connector on the operator panel board. Is the cable seated correctly? Seat the cable correctly 9 Operator panel cable-check continuity of the operator panel cable. Is there continuity? Replace the RIP board. See "RIP board removal" on page 4-70 Go to "Operator panel removal" on page 4-46 and replace the operator panel cable Replace the RIP board. See "RIP board removal" on page 4-70 10 RIP board-a poor ground connection between pin 4 on the operator panel board connector can cause this symptom. Check for continuity between Pin J1-4 and ground on the board. See "RIP board" on page 5-14. Is there continuity? Go to step 11 11 Operator panel cable-check continuity of the operator panel cable. Is there continuity? Replace the operator panel. See "Operator panel removal" on page 4-46 Go to step 13 Go to "Operator panel removal" on page 4-46 and replace the operator panel cable Call your next level support Go to step 14 12 Operator panel assembly-does the operator panel display all diamonds, with the power on/status LED on and 5 beeps? Voltage checks at RIP connector J1. See "RIP board" on page 5-14. Check the voltages on RIP connector J1 as shown: Pin J1-1 J1-2 J1-3 J1-4 J1-5 Voltage Voltage (display active-LCD (display static) Test running) +5 V dc +5 V dc +5 V dc Ground +5 V dc Voltage varies 1.0 to 2.0 V dc +5 V dc Voltage varies 1.0 to 2.4 V dc Ground +5 V dc 13 Replace the operator panel. See "Operator panel removal" on page 4-46 Are the voltages correct? 14 Operator panel cable-check continuity of the operator panel cable. Is there continuity? Replace the operator panel. See "Operator panel removal" on page 4-46 Go to "Operator panel removal" on page 4-46 and replace the operator panel cable Diagnostic information 2-133

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Diagnostic information
2-133
5060-00
x
7
RIP board—measure the voltage at connector J1-2 on
the RIP board. See
“RIP board” on page 5-14
. The
voltage measures approximately +5 V dc.
Is the voltage correct?
Replace the
operator panel.
See
“Operator
panel removal”
on page 4-46
Go to step 8
8
Operator panel cable (operator panel connection)—
make sure the operator panel cable is seated correctly
in the connector on the operator panel board.
Is the cable seated correctly?
Go to step 9
Seat the cable
correctly
9
Operator panel cable—check continuity of the operator
panel cable.
Is there continuity?
Replace the RIP
board. See
“RIP
board removal”
on page 4-70
Go to
“Operator
panel removal”
on page 4-46
and
replace the
operator panel
cable
10
RIP board—a poor ground connection between pin 4
on the operator panel board connector can cause this
symptom. Check for continuity between Pin J1-4 and
ground on the board. See
“RIP board” on page 5-14
.
Is there continuity?
Go to step 11
Replace the RIP
board. See
“RIP
board removal”
on page 4-70
11
Operator panel cable—check continuity of the operator
panel cable.
Is there continuity?
Replace the
operator panel.
See
“Operator
panel removal”
on page 4-46
Go to
“Operator
panel removal”
on page 4-46
and
replace the
operator panel
cable
12
Operator panel assembly—does the operator panel
display all diamonds, with the power on/status LED on
and 5
beeps
?
Go to step 13
Call your next level
support
13
Voltage checks at RIP connector J1. See
“RIP board”
on page 5-14
. Check the voltages on RIP connector J1
as shown:
Are the voltages correct?
Replace the
operator panel.
See
“Operator
panel removal”
on page 4-46
Go to step 14
14
Operator panel cable—check continuity of the operator
panel cable.
Is there continuity?
Replace the
operator panel.
See
“Operator
panel removal”
on page 4-46
Go to
“Operator
panel removal”
on page 4-46
and
replace the
operator panel
cable
Step
Action and questions
Yes
No
Pin
Voltage
(display static)
Voltage (display active—LCD
Test running)
J1-1
+5 V dc
Voltage varies 1.0 to 2.0 V dc
J1-2
+5 V dc
+5 V dc
J1-3
+5 V dc
Voltage varies 1.0 to 2.4 V dc
J1-4
Ground
Ground
J1-5
+5 V dc
+5 V dc