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117

Call Service 1 ----- Polygon doesn’t rotate......... Refer to LSU (Laser Scanning Unit) Section (P.42).

• 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.42)

• 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 6 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 (160

°C: 5Bh) within 50 seconds.

03: means that it did not reach the second stabilizing temperature (185

°C: 3Ch) within 70 seconds after reaching the first stabiliz-

ing temperature (160

°C: 5Bh).

04: means that it dropped to 165

°C: 61h (-40 deg) or below by the temperature control after reaching the second stabilizing tem-

perature (185

°C: 3Ch).

05: means that it did not reach the first stabilizing temperature (160

°C: 5Bh) within 30 seconds from detection temperature 1

(70

°C: D8h).

06: means that it became 235

°C: 2Ah 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) and open (AD: FFh or over) were detected.

Call Service 4 ----- Rotation of Fan.......... Refer to FAN Motor Section (P.39)

• 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... 

FAN 1

 (

Right Fan) ON (High speed)

:3... 

FAN 1

 (Right Fan) ON (Low speed)

:4... 

FAN 

2

 (Left Fan) ON (High speed)

:5... 

FAN 

2 

(Left Fan) ON (Low speed)

Call service 5 ----- Rotation of Engine motor.......... Refer to Motor Drive Section (P.32)

• 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 Unit and/or loose connection of High voltage terminals (CHRG, GRID). 
• First, replace the Drum unit 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, The “CALL SERVICE3” does not disappear until the Factory Setup or Service Function #529 is 

executed.

Therefore Service Function #529 should be executed before the confirmation, and #529 should be done after the countermeasure.

118

"CALL SERVICE 1" means that the polygon motor inside the LSU does not rotate.
The rotation of the polygon motor is detected by IC300-R32pin (XREADY).

119

"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 IC300-T31pin. (XHSYNC)

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

120

"CALL SERVICE 3" means that the temperature of the fuser does not rise up to or exceed a constant temperature.
The temperature is monitored with the thermistor inside the fuser and detected with the voltage input into IC300-U34pin.

* When Call Service 3 is occurred, the cause can be distinguished by service mode  655.
Refer to P.117 for details.