Service Instructions Centurion Qex CeramPress Qex Neytech Qex DENTSPLY Ceramco Yucaipa, CA
Table of Content Chapter Title 1 1.1 1.2 General Information Safety Information Repair Devices and Tools 2 2.1 Repair Parts Repair Part List 3 3.1 3.2 3.3 3.4 Circuit Diagrams and Drawings Wiring Diagram Block Circuit Diagram Component Mounting Diagram of Control PC Pneumatic Diagram 4 4.1 4.2 Elimination of Errors Troubleshooting Error Messages 5 5.1 5.2 5.3 5.4 Checks Check of Check of Check of Check of 6 6.1 6.2 Settings Calibration of Muffle Temperature Calibration of Vacuum 7 7.1 7.1.1 7.
Table of Content Cont. 8 8.1 8.2 8.3 8.4 Others Reset of Firing Cycle Reset of Memory Centurion/Cerampress Selection Test Programs 9 9.1 Service Product Service Information 9363133 rev.
1.1 Safety Information Repair work must only be performed by service technicians authorized by DENTSPLY Ceramco! The unit must only be operated with original spare parts and accessories. Only in this way the performance data provided in the instructions for use can be achieved and the required operational safety is ensured. ! !! During service work the unit must be unplugged from electrical source!! Exception: During setting and adjustment work the unit must be switched on.
1.
2.1 Repair Parts Item No. Description 1 Membrane Switch; Cent. Qex 2 Knob; Encoder Qex 3a Control Drawer; Qex Control Drawer; Qex 3b Effective date code 0650 Control Drawer; Qex 3c Effective date code 0638 4 Serv; PCB Assy, Encoder 5a Serv; Display Assy, Qex Serv; PCB Assy. Display 5b Effective date code 0703 Serv; PCB Assy. Display 5c Effective date code 0637 6 Triac; 25A, 400V 7a Serv; PCB Assy, Control Serv; PCB Assy. Control 7b Effective date code 0703 Serv; PCB Assy.
2.1 Repair Parts Cont. 9363133 rev.
2.1 Repair Parts Cont. Centurion Qex Neytech Qex Top Enclosure Mtg. Brkt. 12 Vacuum Chamber 10 13 11 9363133 rev.
2.1 Repair Parts Cont. Cerampress Qex 18 12 20 14 17 13 12 Connect to tabs inside chamber 10 11 9363133 rev.
2.1 Repair Parts Cont. Cerampress QEX 21 22 27 Heatshield 24 23 26 25 Centurion QEX Neytech QEX 28 27 9363133 rev.
2.1 Repair Parts Cont. Shoulder Bolt 1/2” x 5/16” Screw 10-32 Bronze Bushing 16 15 Cam Pivot Linkage Anchor Plate (2) 29 Screw 10-32 x .50” 19 Balance Support 9363133 rev.
3.1 Wiring Diagram 9363133 rev.
Filter, Choke (230V Only) 3.2 Block Circuit Diagram 9363133 rev.
3.3 Component Mounting Diagram of Control PCB J6 J7, J8 J9 J11 J13 J16 RP1 RP3 RP4 Fan connection CeramPress Thermocouple connection Motor connection Motor connection (feedback) RS-232 connection LCD backlight connection Muffle temperature potentiometer Adjustment pressure potentiometer vacuum level potentiometer 9363133 rev.
3.4 Pneumatic Diagram Press Cylinder Press Solenoid Muffle Air Flow Regulator SOL1 SOL2 Vent Component Air Inlet Vacuum Pump Vacuum Transducer on PC Board 9363133 rev.
4.1 Troubleshooting Furnace does not turn on • Disconnect power cord from furnace, check fuses at inlet socket on back panel (230V). Check F1 on PCB • Check J-16 on the control PCB • Exchange control PCB (chapter 7.1.1) LCD display has no content • Check contrast adjustment - turn adjustment wheel after furnace is turned on (first display screen that appears). • Check the -15V on the control PCB (U24 : 1) • Exchange display PCB (chapter 7.1.3) • Exchange control PCB (chapter 7.1.
4.2 Error Messages “Err 1“ appears on the display No temperature signal • Short J7 thermocouple input the display should read room temperature • Exchange the thermocouple (chapter 7.2.1) • Exchange the control PCB (chapter 7.1.1) “Err 2“ appears on the display Temperature exceeded 1220°C • Remove wires from J8, connect calibrator/thermometer CL25 to J8 (chapter 5.1) • Check thermocouple wiring harness from control PCB to muffle • Exchange thermocouple (chapter 7.2.1) • Exchange the control PCB (chapter 7.1.
4.2 Error Messages Cont. “Err 6“ appears on the display No vacuum • Connect the vacuum pump to a separate outlet and check operation • Check the seal on door to muffle chamber (Press on top cabinet while pulling vacuum) • Check for complete muffle closure • Check vacuum hose connection for kinks • Exchange the solenoid assembly (chapter 7.2.
5.1 Check of Temperature (PCB) Aids: • Calibrator/thermometer (CL25) Purpose: • To check and adjust the temperature on the PCB at 980°C Procedure: Also see chapter 4.3, thermocouple connection and potentiometer location • Remove all power from the furnace • Open lower cabinet according to chapter 7.
5.2 Check of Temperature (Muffle) Aids: • • • • Temperature Meter Calibration Platform Calibration Card (Centurion and Cerampress) Calibration Card (Neytech) Procedure: • Check in the setup screen for a calibration temperature of 0°C • Insert the calibration card • Run the warm-up program Important: Before adjusting the temperature at least one cycle should be fired to ensure a good working temperature of the furnace.
5.3 Check of Vacuum Loss Aids: • Stop watch Procedure: • Connect a vacuum pump to the Qex. Let the unit cool to 100°C or less. Create the following vacuum program: LoTemp = 100°C Rate = 1°C/min HiTemp= 400°C Vacuum = ON, vacuum on @ 100°C.
5.4 Check of Motor Position Aids: • Service card • Multimeter Purpose: To verify the correct potentiometer adjustment on the motor assembly • Open the control drawer as described in chapter 7.
6.1 Calibration of the Muffle Temperature Aids: • • • • Temperature Meter (Type-R) Cal-platform Calibration Card (Centurion and Cerampress) Calibration Card (Neytech) Procedure: (Also see chapter 3.3 for the location of the adjustment potentiometer) • Open the control drawer as described in chapter 7.
6.2 Calibration of Vacuum Aids: • Digital vacuum meter Purpose: • Vacuum adjustment after control PCB exchange Procedure: (Also see chapter 3.3 for the location of the adjustment potentiometers) • Open control drawer as described in chapter 7.
7.1 General Repair Information Note: ! !! During servicing, the unit must be unplugged from the electrical power source!! Please remember the order of disassembly in order to ensure a proper reassembly.
7.1 General Repair Information Cont.
7.1.1 Exchange of Computer Board Aids: IC removal tool for PLCC chips Procedure: Caution: Firing programs as well as furnace data, will be lost when exchanging the PC board. • • • • • Before exchanging the PC board save programs on a Backup card Observe recommendations per chapter 1 Open control drawer as described in chapter 7.
7.1.2 Exchange of Keypad Procedure: • Observe instructions according to chapter 1 • Open control drawer as described in chapter 7.
7.1.3 Exchange of Display Procedure: • Observe instructions according to chapter 1 • Open control drawer as described in 7.1 Remove 2 screws from the bottom and 2 screws from the sides Remove all ribbon connectors which lead to the display (J14, J16) Remove 4 screws from the display module New display, effective date 0637 Exchange the display module (Ensure correct placement of card reader bracket) Red line on cable needs to be on top Reassemble in reverse order.
7.1.4 Exchange of Encoder Procedure: • Observe instructions according to chapter 1 • Open control drawer as described in chapter 7.1 Remove the encoder ribbon cable from the control PCB (J15) Remove adjusting wheel Remove 2 screws from the encoder PC board Exchange the encoder PC board Caution: Do not kink the ribbon connector • Install the new encoder in reverse order 9363133 rev.
7.2.1 Exchange of Thermocouple Procedure: • Observe instructions according to chapter 1 • Remove top enclosure as described in chapter 7.1 Disconnect the thermocouple, unscrew and remove • • • Install the new thermocouple Check for vacuum leak according to chapter 5.3 Calibrate the temperature according to chapter 6.1 and 5.2 9363133 rev.
7.2.2 Exchange of Solenoid Valves Procedure: • Observe instructions according to chapter 1 • Open control drawer as described in chapter 7.1 Remove electrical connections (SOL1, SOL2) Remove screw from transformer clamp. Remove solenoid valve terminals from clamp. Remove vacuum hoses from solenoid valves Remove screw and nut from valve body Slide spiral wrap away from hose barb Cut the spiral hose at end of inlet • Reassemble in reverse order. • Check for vacuum leak according to chapter 5.
7.2.3 Exchange of Muffle Procedure: Chamber must be in up position for muffle exchange Caution: Wear a face mask during this service • Observe instructions according to chapter 1 • Remove top enclosure as described in chapter 7.1 • Disconnect the thermocouple as described in chapter 7.2.1 Loosen 3 retainer screws Turn the retainer ring counter clockwise and remove Caution: Hold muffle in place Lower muffle to rest on covered door Move muffle to side to remove muffle wires 9363133 rev.
7.2.3 Exchange of Muffle Cont. Disconnect both quick connectors • • • • Reassemble in reverse order. Add teflon tape to the threads of the thermocouple and install Check for vacuum leaks according to chapter 5.3 Check temperature according to chapter 5.2 and calibrate according to chapter 6.1, if necessary 9363133 rev.
7.2.4 Exchange of Motor Procedure: • Ensure chamber is in up position before starting • Observe instructions according to chapter 1 • Open control drawer as described in chapter 7.1 Disconnect motor wire harnesses (J9, J11) Remove 8 screws from rear access panels Carefully move right side access panel to right. Use allen wrench to remove motor linkage bolt. Remove motor mounting screw (from rear of furnace) Remove motor assembly. Ensure motor wires are free and clear before removal.
8.1 Reset of Firing Cycles Purpose: • To reset the firing cycles Procedure: • Select the Setup function • Press the “Hidden” Key Hidden Key • • • • Select the “Clear Firing Cycles” line Push the adjustment wheel The number of previous firing cycles is now 0 Push ESC 9363133 rev.
8.2 Reset of Memory Purpose: • To erase programs and firing cycles Procedure A: • Select the Setup function • Press the “Hidden” Key Hidden Key • • • • • • Select the “Clear EEPROM” line Push the adjustment wheel The furnace displays a box “Please Wait” After 15 seconds the furnace executes a test, the muffle stays open The display is dark See chapter 8.4 for Mode Selection Procedure B: • Unplug the furnace • Hold down the F2 key and apply power • Release the key • See chapter 8.
8.3 Centurion/Cerampress Selection Purpose: • To define model after reset of memory or exchange of computer PCB. Procedure: • Select the Setup function • Press the “Hidden” Key Hidden Key • • • Select the furnace model Push the adjustment wheel Push ESC 9363133 rev.
8.4 Test Programs Purpose: • To aid in temperature check Procedure: • Insert calibration card • Press the card function key To run the warm-up program select card Program 1. To run the temperature calibration program select card Program 2. 9363133 rev.
9.1 Product Service WARNING: This equipment is designed with safety features to protect the operator and must not be modified in any form. Only qualified individuals should repair this piece of equipment. Failure to observe these precautions may result in burns or electrical shock.
