Service manual

PagePro 1200 Series Troubleshooting

7-2. PagePro 1250E Malfunction Detection

When any of the following malfunctions is detected, the drive for all elements is turned OFF and the

hardware error is displayed on the control panel and the Status Monitor installed in the PC.

(1) SOS malfunction

1. No -S_SCAN signals are detected within 0.5 sec. after the laser has been turned ON.

2. The -S_SCAN signal is turned OFF after the laser has been turned ON.

(2) Polygon Motor malfunction

1. No POLYGON_LOCK signals are detected for a continuous 0.5-sec. period at any time 6 sec.

after the Polygon Motor has been energized.

2. The POLYGON_LOCK signal is detected for a continuous 5-sec. period when the Polygon

Motor is deenergized.

3. No POLYGON_LOCK signals are detected within 3 sec. after the lapse of 1 sec. after the Poly-

gon Motor has been energized.

4. No POLYGON_LOCK signals are detected within 1 sec. after the first POLYGON_LOCK sig-

nal has been detected after the Polygon Motor was energized.

(3) Main Motor malfunction

1. No -Motor_Lock signals are detected within 1 sec. after the Main Motor has been energized.

2. The -Motor_Lock signal remains OFF for a continuous 0.1-sec. period.

(4) Fusing Malfunction

1. An abnormally high fusing temperature results if the temperature detected by the Thermistor

exceeds 235

C for 0.05 sec. while the fusing temperature is being controlled.

2. The Thermistor is considered to be faulty if the temperature detected by the Thermistor is less

than the specified value for 0.05 sec. at any time for a 9-sec. period after 5 sec. after the warm-up

cycle has been started (only if the temperature detected by the Thermistor is 80

C or less).

3. A warm-up failure results if the temperature detected by the Thermistor does not increase for the

period of 3 sec. or more during the period of time from 0.7 sec. after the Heater Lamp (H1) is

turned ON to the time when the Heater Lamp (H1) is turned OFF (except during printing).

4. A warm-up failure results if the Heater Lamp (H1) remains ON for 30 sec. or more (except

while the Main Motor remains energized).

5. An abnormally low fusing temperature results if the temperature detected by the Thermistor

remains below the set temperature for a continuous 50-msec. period in any mode (the set tem-

perature is 140

C at 600 dpi and 110

C at 1200 dpi during printing, and 70

C during standby).

(5) Cooling Fan Motor malfunction

The FAN_LOCK signal remains HIGH or LOW for a continuous 2-sec. period while the Cooling

Fan Motor (M2) is turning.

(6) High voltage malfunction

1. The drum charge monitor voltage (C_MON) falls outside the specified range at any time 0.5 sec.

after the power has been turned ON.

2. The image transfer monitor voltage (T_MON_V, T_MON_I) signal falls outside the specified

range.