Brother HL-4000CN Service Manual page 233

Step
Checking harness ASSY FDR for
continuity
19 Check the following for continuity.
J47-13PIN<=>P475-2PIN
J47-14PIN<=>P475-1PIN
Checking tray1 turn clutch ASSY for
resistance value
Remove the clutch connector J475.
20
Is J475-1PIN<=>J475-2PIN less than
200 ?
Checking harness ASSY DRV2 for
continuity
21
Is J12-9PIN<=>J42-22PIN continuous
normally?
Checking tray1 feed solenoid for operation
Does the feed gear in the feeder run when
printing 1 sheet?
22
Checking tray1 feed solenoid
Does tray1 feed solenoid function
normally?
23
Using tray1 feed solenoid diagnostic tool,
check by digital output test.
In the test, close the interlock SW.
Checking drive PWB for signal
24
Is P/J47-11PIN<=>P/J60-2PIN +24VDC?
Checking harness ASSY FDR for
continuity
25 Check the following for continuity.
J47-11PIN<=>P474-2PIN
J47-12PIN<=>P474-1PIN
Checking tray1 feed solenoid for
resistance value
26
Remove the solenoid connector J474.
Is J474-1PIN<=>J474-2PIN less than
100 ?
Checking harness ASSY DRV2 for
continuity
27
Is J12-10PIN<=>J42-21PIN continuous
normally?
Checking MSI turn clutch for operation
28 Does the turn roll in the MSI run when
printing 1 sheet?
Checking MSI turn clutch
Does MSI turn clutch function normally?
29 Using MSI turn clutch diagnostic tool,
check by digital output test
In the test, close the interlock SW.
Check
V-23
Remedy
Yes
Replace
harness ASSY
Go to step [20]
FDR
Replace tray1
turn clutch
Go to step [21]
ASSY
Replace
Replace MCU and
harness ASSY
HVPS PWB
DRV2
Check parts for
missing and
Go to step [23]
change paper, if
no problem
Check the spring
and stopper of
Go to step [24]
tray1 feed
solenoid for
disengagement
Replace drive
Go to step [25]
PWB
Replace
harness ASSY
Go to step [26]
FDR
Replace tray1
Go to step [27]
feed solenoid
Replace
Replace MCU and
harness ASSY
HVPS PWB
DRV2
Go to step [29]
Go to step [31]
Check the clutch
Go to step [30]
for slip, or the gear
for damage.
No