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113

KX-MB1500UCW/KX-MB1520UCB

No.

Symptom

Cause

Countermeasure

1

Dirty or failed the pickup roller

Clean or replace the pickup roller

Dirty or failed the pickup rubber

Clean or replace the separation rubber

2

Dirty the pressure roller or the heat roller

Clean the pressure roller and the heat roller

Failed the spring of pressure roller

Replace the spring of pressure roller

Separator of heat roller a check

Replace separator

Dust on the recording paper path

Clean the recording paper path

Too thin recording paper

Use the recording paper from 16lb to 24lb

3

Dirty or failed the pickup roller

Clean or replace the pickup roller

Dirty or failed the pickup rubber

Clean or replace the separation rubber

Dirty or failed the paper feed roller

Clean or replace the regist roller

Dust on the recording paper path

Clean the recording paper path

Failed LSU

Replace LSU

Over the max capacity of the recording paper

Set up to MAX 250 sheets

Too thick or too thin recording paper

Use the recording paper from 16lb to 24lb

4

The Recording Paper
Does Not Feed (P.130)

Dirty or failed the pickup roller

Clean or replace the pickup roller

Dirty or failed the pickup rubber

Clean or replace the separation rubber

Failed the gear 

Check the gear

Failed the solenoid

Check the solenoid

Failed the engine motor

Go to Motor Section (P.159)

Failed the pickup sensor lever

Check the pickup sensor lever

Failed the pickup sensor

Go to Sensor Section (P.157)

5

The Recording Paper Jam
(P.131)
”PAPER JAMMED” ON
THE LCD

Dirty or failed the pressure roller

Clean or replace the pressure roller

Dirty or failed the heat roller

Clean or replace the heat roller

Separator of heat roller a check

Replace separator

Dust on the recording paper path

Clean the recording paper path

Failed the paper feed roller

Replace the registration roller

Failed the pickup sensor lever

Check the pickup sensor lever

Failed the pickup sensor

Go to Sensor Section (P.157)

Failed the registration sensor lever

Check the Registration & Manual paper sensor (paper top sen-
sor) lever

Failed the registration sensor

Go to Sensor Section (P.157)

Failed the exit sensor

Check the Paper Exit sensor lever

Too thick or too thin recording paper

Use the recording paper from 16lb to 24lb

Not set the toner bottle

Set toner bottle

6

Dirty the recording paper path

Clean the recording paper path

Dirty the pressure roller

Clean the pressure roller

Dirty the regist roller

Clean the registration roller

Failed the high-voltage terminal

Check the high-voltage terminal 

Failed the high voltage power supply board

Go to High Voltage Section (P.166)

114

KX-MB1500UCW/KX-MB1520UCB

No.

Symptom

Cause

Countermeasure

1

Dirty or failed the white plate and sheet (2
places)

Clean or replace the white plate and sheet

Dirty or failed the glass board

Clean or replace the glass board

The cause of printing

Failed CIS

Go to CIS Control Section (P.162)

2

Dirty or failed the white plate and sheet (2
places)

Clean or replace the white plate and sheet

Dirty or failed the glass board

Clean or replace the glass board

Failed CIS movement (at SG)

Replace the belt or the gear or the shaft or the FB motor

Failed CIS

Go to CIS Control Section (P.162)

The cause of printing

115

KX-MB1500UCW/KX-MB1520UCB

Call Service 1 ----- Polygon doesn’t rotate......... Refer to LSU (Laser Scanning Unit) Section (P.49).

• First, listen to the sound. If rotation sound isn't heard, check 24V line, POLON signal and POLCLK signal. If even a little of sound

is heard, check XREADY signal.

Call Service 2 ----- Laser isn't output.......... Refer to LSU (Laser Scanning Unit) Section (P.49)

• This can be judged only by referring to signal. Check 5V line, XHSYNC, XAPC, XVIDEO, XLDON.

Call Service 3 ----- Detection of fixing temperature.......... Refer to Heat Lamp Control Circuit (P.60)

• *Service mode *655 tells the detection number and 3 latest temperatures of the thermistor. The detection point of the Call Ser-

vice 3 and the thermistor temperature is displayed. Maximum 3 latest temperatures are displayed showing the newest on the left.
[AABB CCDD EEFF] AA, CC and EE show the detection points and BB, DD and FF show their temperature detection points.
00: CALL SERVICE 3 was not occurred.
01: means that the value of AD did not increased by 4 steps or more within 10 sec soon after the heater was turned ON. (ther-
mistor’s open detection)
02: means that it did not reach the first stabilizing temperature (170

°C: 3Dh) within 50 seconds.

03: means that it did not reach the second stabilizing temperature (205

°C: 20h)* within 75 seconds after reaching the first stabi-

lizing temperature (170

°C: 3Dh).

04: means that it dropped to -40 deg or below by the temperature control after reaching the second stabilizing temperature
(205

°C: 20h)*.

05: means that it did not reach the first stabilizing temperature (170

°C: 3Dh) within 35 seconds from detection temperature 1

(70

°C: DAh).

06: means that it became 235

°C: 13h or over during printing.

07: means that during printing the short of the thermistor (AD: 00h) was detected.
08: means that the thermistor’s short (AD: 00h) were detected.
09: means that it became 235

°C: 13h or over during sleep condition (heater OFF).

*: depend on its printing conditions (room temperature, number of printing, printing paper size etc.).

Call Service 4 ----- Rotation of Fan.......... Refer to FAN Motor Section (P.44)

• Connector isn’t inserted firmly, dust is caught in and the fan is broken.
• Rotation of the Fan can be confirmed by following Test Mode.

Service mode *677
:1... Normal operation (default)
:2... Right Fan & Left Fan ON (High speed)
:3... Right Fan & Left Fan ON (Low speed)
:4... Both Fan OFF

* As for Call Service 1, 2, 4, turn the power OFF then ON to restart.

Once “CALL SERVICE3” is displayed, it does not disappear until the Factory Setup or Service Function #529 is 

executed.

Therefore Service Function #529 should not be executed before the confirmation, and #529 should be done after the countermea-
sure.

116

KX-MB1500UCW/KX-MB1520UCB

"CALL SERVICE 1" means that the polygon motor inside the LSU does not rotate.
The rotation of the polygon motor is detected by IC300-H25pin (NREADY).