User manual KYOCERA DC-3285

[. . . ] Service personnel are advised to read this booklet carefully to familiarize themselves with the warnings and precautions described here before engaging in maintenance activities. Safety warnings and precautions Various symbols are used to protect our service personnel and customers from physical danger and to prevent damage to their property. These symbols are described below: DANGER: High risk of serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol. WARNING:Serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol. CAUTION: Bodily injury or damage to property may result from insufficient attention to or incorrect compliance with warning messages using this symbol. [. . . ] Display "CLE" using the copy exposure adjustment keys. The indication for selecting a maintenance item No. appears. 1-4-26 2DC Maintenance item No. U905 Checking/clearing counts by the DP Description Displays or clears the counts of the DP. Also to clear the counts after replacing consumable parts. Change the indication of the copy quantity display by lighting a copy exposure indicator using the copy exposure adjustment keys. 3 Copy quantity display (count value) First 3 digits of the number of original replacement Last 3 digits of the number of original replacement Clearing the count (CLE) Description Clearing 1. 3 using the copy exposure adjustment keys. The indication for selecting a maintenance item No. U908 Checking the total count Description Display the total count value. Change the indication of the copy quantity display by lighting a copy exposure indicator using the copy exposure adjustment keys. The counts, however, can be cleared only one time. If either of the total count or the scanner count exceeds 1, 000, this mode cannot be run. Purpose To start the counters with value 0 when installing the machine. If the counters have been already cleared or either of the total counter or the scanner counter exceeds 1, 000, this mode cannot be run and "nG" is displayed. Select "on" using the zoom +/­ keys. Display ­­­ on Operation Canceling the clearing Executing the clearing 3. Completion To exit this maintenance item without clearing the data, press the stop/clear key. The indication for selecting a maintenance item No. U990 Checking/clearing the time for the exposure lamp to light Description Displays or clears the accumulated time for the exposure lamp to light. Purpose To check duration of use of the exposure lamp. Also to clear the accumulated time for the lamp after replacement. [. . . ] On the contrary, if PLGRDYN does not turn to L level within 8 seconds since PLGDRN has been L level. Engine board Polygon motor control circuit Laser scanner unit +24V3 CPU U1 3 PLGDR 2 +5V 1 PGND GND PLGRDYN 5 R32 4 3 2 1 3 + Polygon motor Q18 25, 984 rpm +24V3 PGND PLGDRN PLGRDYN PLGCLK Main board 3. 3V PLL control IC (IC1) PLGCLK 2598. 4 Hz 2 1 Q17 PGND YC13 Figure 2-3-6 Polygon motor control circuit 2-3-7 2DC 2-3-3 Power supply board The power supply board provides the AC power input and DC power and outputs. The high voltage bias generator circuit is mounted on a separate board. A simplified schematic diagram is shown below. Power supply unit AC input Power Current switch fuse (SW1) (F1) Noise filter circuit Transformer (T1) 24 V DC rectifier/ smoothing circuit 24 V DC shutoff circuit Exit sensor EXITN +24V1 SLEEPN FAN Cooling fan +24V1 FET (Q1) Switching/ Over current detection circuit +5 V 5 V DC rectifier/ smoothing circuit PGND, SGND THERM Photocoupler (PC1) Over voltage detection circuit Thermistor +24V2 Photocoupler (PC3) Triac (TRC1) Thermal cutout PhotoTriac (PC2) HEATN Transistor (Q8) Zero cross signal detection circuit ZCROSS Heater lamp Figure 2-3-7 Power supply board circuit block diagram 2-3-8 2DC 2-3-4 Bias board The bias board contains the developing bias output circuit, registration sensor, paper empty sensor, and the cassette switch. It also provides a liaison connection to the high voltage board, power supply, and the toner sensor. Bias board (KP-5067) +5V Toner sensor +24V2 +24V1 FET +5V +5V +5V +24V3 TONER +24V2 +24V2 +24V2 SLEEP +24V3 +5V TONEREPY Engine board Power supply board High voltage board Registration sensor Casette switch RESIT SWIN Paper sensor PAPERN RTHVDR, HVISEL PSEL1, PSEL2 FAN1 FAN FAN2 HEATN, ZCROSS, SLEEPN EXTIN, THERM +24V2 275 V DC + AC Developing bias output circuit Developing roller HVCLK Figure 2-3-8 Bias board circuit block diagram 2-3-9 2DC 2-3-5 High voltage board The high voltage board contains the high voltage output circuit, interlock switch circuit as well as providing a liaison connection with the power supply board, bias board, and the engine board. High voltage board High voltage output circuit Engine board Bias board MHVDR Main charger Control and driver circuit THVDR, RTHVDR PSEL1, PSEL2 HVISEL Control and driver circuit Transfer roller Transfer bias output positive voltage circuit Power supply board +24V2 +24V3 +24V2 FET +24V2 Interlock switch +24V1 FAN, HEATN, SLEEPN ZCROSS, THERM, EXITN +5V +5V Figure 2-3-9 High voltage board circuit block diagram 2-3-10 2DC (1) Interlock switch The interlock switch is located on the high voltage board and opened and closed in conjunction with the front cover or the front top cover via the interlock lever. [. . . ]