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117

KX-MB1900UCB/KX-MB2020UCB

No.

Symptom

Cause

Countermeasure

1

The cause of ADF

Go to Skew (P.133)

The cause of scanner glass

Check the scanner glass 

Problem with the other FAX machine

2

The cause of printing

Go to Skew (P.133)

Problem with the other FAX machine

3

The Received or Copied
Data Is Expanded (P.138)

Dirty or failed the document feed roller (at ADF) Clean or replace the document feed roller
Dirty or failed the separation roller (at ADF)

Clean or replace the separation roller

Failed CIS movement (at SG)

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

4

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

Go to Dark or White Vertical Line (P.126)

Failed CIS

Go to CIS Control Section (P.169)

5

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

Dirty or failed the document feed roller (at ADF) Clean or replace the document feed roller
Dirty or failed the separation roller (at ADF)

Clean or replace the separation roller

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.169)

The cause of printing

Go to Dark or White Vertical Line (P.126)

118

KX-MB1900UCB/KX-MB2020UCB

Call Service 1 ----- Polygon doesn’t rotate......... Refer to LSU (Laser Scanning Unit) Section (P.44).

• 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.44)

• 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.58)

• *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.40)

• 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

Call service 5 ----- Rotation of Engine motor.......... Refer to  Motor Drive Section (P.33)

• Engine motor’s rotation detection signal LD did not become Low within rated speed ±6.25%.
• Service mode *556: the operation of Main Motor can be checked by pressing 0 and SET buttons.

Call service 6 ----- Detection of Charger error.......... Refer to the  HVPS (High Voltage Power Supply) Section (P.56)

• Breaking of charger’s wire of drum cartridge and/or loose connection of High voltage terminals (CHRG, GRID). 
• First, replace the drum cartridge even so, it doesn’t function check the high voltage power supply.

* As for Call Service 1, 2, 4, 5 and 6, 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.

119

KX-MB1900UCB/KX-MB2020UCB

"CALL SERVICE 1" means that the polygon motor inside the LSU does not rotate.
The rotation of the polygon motor is detected by IC300-F23pin (NREADY).

120

KX-MB1900UCB/KX-MB2020UCB

"CALL SERVICE 2" means that the synchronous signal out of the LSU cannot be detected.
The synchronous signal out of the LSU is detected by IC 300-G23pin. (NHSYNC)

As for the "Pulse" waveform of the above flow chart, see the timing chart.