Vulcan-Hart 3-130 Скачать руководство пользователя страница 36 | Manualshive

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8.4 DISPLAY PCB

TOOLS:

Phillips screwdriver

CAUTION!

Use proper ESD grounding techniques when handling
electronic components

8.4.1:

Follow steps 8.1.1 through 8.1.2 of CONTROL DRAWER
REMOVAL

8.4.2:

Disconnect grey ribbon connector.

8.4.3:

Remove from snap-on standoffs.

8.4.4:

Replace with new Display PCB.

8.4.5:

Connect grey ribbon connector. Bend away from
Display PCB so it won't cut into ribbon.

8 – 3

SECTION 8 - DISASSEMBLY/REASSEMBLY - 3-STAGE

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Содержание 3-130

Страница 1: ...Vulcan Furnace Service Manual Models A 130 3 130 3 550PD A550 3 550 3 550A A 1750 3 1750 3 1750A CERAMCO...

Страница 2: ...how to work with hazardous voltages Don t locate and operate the furnace in close proximity to combustible materials Observe all WARNING statements They point out situations that can cause injury or e...

Страница 3: ...UIDES 5 1 5 3 1 Power Supply 5 1 5 3 2 Microprocessor 5 1 5 3 3 Peripheral Drive 5 1 5 3 4 Motor Drive 5 1 5 3 5 Analog Circuitry 5 1 5 3 6 Display Board 5 1 5 3 7 Fan Drive Control 5 2 5 4 TROUBLESHO...

Страница 4: ...the set value of RP2 As Vpin3 is near in value of Vref a proportional control takes over i e power is delivered by bursts to the load To slow down the heatup time of the muffle RP2 set clockwise and...

Страница 5: ...iac gate output pulse current is about 60mA The triac is triggered in quadrants II and III Synchronization is provided by resistor R10 Its value determines the trigger pulse length 2 3 3 TRIAC DRIVE A...

Страница 6: ...ed voltage across their terminals NOTES ________________________________________________ ________________________________________________ ________________________________________________ _____________...

Страница 7: ...CONTROL 2 5 BLOCK DIAGRAM Power Supply D1 C1 R11 120 240V 60 50Hz Line Return Cabinet 6 8V 8 6V Set Point Pot Rate Control Pot Amplifier U1 Comparator Power Supply Triac Driver U2 Thermocouple Power...

Страница 8: ...2 6 SCHEMATIC 2 4 SECTION 2 TROUBLESHOOTING A CONTROL...

Страница 9: ...SECTION 2 TROUBLESHOOTING A CONTROL 2 7 CONTROL CIRCUIT BOARD Rate Control Temperature Meter Connection Triac Gate Muffle Connections Setpoint Potentiometer Thermocouple Amplifier Proportional Control...

Страница 10: ...N RED YELL GATE BLK WHT GRN YELL GRN YELL CABINET GND 230V A 1750 230V HOOK UP HEATING PLATE RIAC HEATSINK TRIAC RED P1 P1 P5 AC1 AC2 MT1 MT2 TAN P6 C C D A A A B B B D DOOR SAFETY SWITCH THERMOCOUPLE...

Страница 11: ...rcuit board is performed in one single step 3 4 1 REQUIRED TEST EQUIPMENT Multimeter Pot adjustment tool WARNING With control drawer opened dangerous voltage points may be exposed Contact with any of...

Страница 12: ...is connected to an opto isolator U7 The isolator s output is connected to the gate of the muffle triac The muffle triac may be activated anytime during an AC cycle but once activated it can only be op...

Страница 13: ...is given to help isolate the problem for a particular failure mode 5 3 TROUBLESHOOTING GUIDES 5 3 1 POWER SUPPLY To determine a faulty power supply use the table on page 5 3 To troubleshoot a faulty...

Страница 14: ...ifier is defective If the output voltage stays at maximum positive typically 1 3 of the supply voltage the input voltage should be more postitive than the input voltage 5 4 3 TRIAC The gate to power l...

Страница 15: ...ve Tmax 20 C This could mean The Tmax was set up too low for this program The destination temperature is relatively low compared to the programmed heat rate eg too much temperature overshoot ERR 8 EEP...

Страница 16: ...power down Muffle does not heat after power up Not in start cycle Door switch not closed No door movement after switch is pressed Furnace is in TEST mode Motor connector J5 loose POWER SUPPLY VOLTAGE...

Страница 17: ...1 ohm DC to U11 2 15 30V Not shorted or open PT1 to PT4 Not shorted or open MICROPROCESSOR Fault Setup Check Results desired Nonfunctional N A U9 3 2 4 9MHz sinusoid operation X1 approximately 0 4V U...

Страница 18: ...ay OK Turn furnace D2 D3 D4 D6 Not shorted or open Off MOTOR DRIVE CIRCUIT Fault Setup Check Results desired No door up or down Furnace in idle U8 16 12 VDC when switch is activated Disconnect J5 U8 1...

Страница 19: ...increase typical Turn furnace off Reconnect No Err2 at elevated TC wires temperatures DISPLAY BOARD Fault Setup Check Results desired LCD dots are all Furnace in idle J8 1 5V on or off at power up J4...

Страница 20: ...264V 60 50Hz Peripheral Drive 12V U2 U1 U4 D1 RT1 U1 U2 K1 K2 Muffle Relays Triac driver Sonar U8 M U6 U9 Pg 5 9 Pg 5 9 Pg 5 9 Pg 5 9 Pg 5 11 Pg 5 11 Pg 5 10 Thermocouple Multiplexed A D Cold Jct Ref...

Страница 21: ...5 9 5 8 SCHEMATICS SECTION 5 TROUBLESHOOTING 3 STAGE POWER SUPPLY...

Страница 22: ...5 10 SECTION 5 TROUBLESHOOTING 3 STAGE 5 8 SCHEMATICS TEMPERATURE CIRCUIT LCD DISPLAY CIRCUIT...

Страница 23: ...5 11A 5 8 SCHEMATICS SECTION 5 TROUBLESHOOTING 3 STAGE MICROPROCESSOR CIRCUIT...

Страница 24: ...5 11B 5 8 SCHEMATICS SECTION 5 TROUBLESHOOTING 3 STAGE...

Страница 25: ...5 12 SECTION 5 TROUBLESHOOTING 3 STAGE PD A 5 9 WIRING DIAGRAM...

Страница 26: ...up mode shows 1000 C The new setup temperature Tcal is now found by the following calculation 500 C 520 C Tcal 961 x1000 961 C Note Abort the cycle before turning off the furnace This is the new Tcal...

Страница 27: ...s used in the furnaces 7 1 SECTION 7 SERVICE PARTS A CONTROL 3 STAGE HEATING PLATE ASSY New 9493426 130 230V 9493364 550 100 120V 9493470 550 9493392 1750 MUFFLE INSULATION 9493341 130 9493361 550 Fac...

Страница 28: ...ludes muffle insulation and 2 heating plates 230V 9493778 550 PD 100 120V 9493779 550 PD 9493996 550A Factory Repair 1750A HEATING PLATE ASSY 230V 9493364 550 PD 100 120V 9493470 550PD MUFFLE INSULATI...

Страница 29: ...FUSE 16 Amp 120V 9320137 FUSE 12 Amp 120V 9494462 ADAPTER PLATE 120V 9493534 REAR PANEL 3 550PD FURNACE CABINET ASSY 9493320 130 FURNACES 9493354 550 FURNACES 9493384 1750 FURNACES 9493807 3 550 PD FU...

Страница 30: ...86 3 550A 3 1750A FAN DUCT ASSY 9493970 3 550A 3 1750A DOOR SPRING 9493368 130 9493908 550 9492754 1750 2 PL SCREW 10 32 x 50 KEP 4 PL HANDLE 9390246 DOOR 9493321 130 9493350 550 9493380 1750 DOOR INS...

Страница 31: ...120V A 550 R9493450 200 240V A 550 R9493451 200 240V A 1750 FUSE 20A S N 9525 and 9320072 earlier SCREW 6 32 x 375 RELAY 1750 ONLY 9320075 TRIAC 9303015 HEATSINK PYROMETER 9390451 KNOB SET POINT 9355...

Страница 32: ...100 125V R9493447 200 240V Replaced by R9495232 Not Shown TERMINAL BLOCK 9390487 DISPLAY PCB R9493347 TC WIRES SCREW 6 32 x 375 SCREW 6 32 x 1 75 FUSE 1A 9320071 TRIAC 9303015 HEATSINK MEMBRANE SWITCH...

Страница 33: ...D NUT 1 4 20 HEX PIVOT ARM SCREW 10 32 SEM BRACE 9493363 BRACKET MOTOR LINKAGE 9493532 BOLT SHOULDER 375 SCREW 8 32 SEM BRACKET MOTOR 9493362 SCREW 8 X 375 SCREW 8 X 50 BRACKET SPRING SPRING 9356016 M...

Страница 34: ...e needed 8 2 TRIAC TOOLS Phillips 2 screwdriver 1 4 nut driver needle nose pliers 8 2 1 Follow steps 8 1 1 through 8 1 2 of CONTROL DRAWER REMOVAL 8 2 2 Disconnect wires from triac located at the rear...

Страница 35: ...ribbon cable at control PCB 8 3 3 Peel off membrane switch Use knife if needed 8 3 4 Clean front panel surface with isopropyl alcohol Allow to dry thoroughly 8 3 5 Place the new membrane switch by loc...

Страница 36: ...nents 8 4 1 Follow steps 8 1 1 through 8 1 2 of CONTROL DRAWER REMOVAL 8 4 2 Disconnect grey ribbon connector 8 4 3 Remove from snap on standoffs 8 4 4 Replace with new Display PCB 8 4 5 Connect grey...

Страница 37: ...1 through 8 1 2 of CONTROL DRAWER REMOVAL 8 5 2 Disconnect wires AC1 AC2 MT1 MT2 and 4 muffle wires from power board 8 5 3 Disconnect orange wire from triac 8 5 4 Disconnect wires from pyrometer 8 5 5...

Страница 38: ...s 8 6 1 Follow steps 8 1 1 through 8 1 2 of CONTROL DRAWER REMOVAL 8 6 2 Disconnect wires from power switch 8 6 3 Disconnect ribbon connectors 8 6 4 Remove relay and door switch wires 8 6 5 Disconnect...

Страница 39: ...components Figure 1 Disconnect wires from Power Switch Figure 4 Remove Door Switch Wires Figure 7 Remove 4 Screws from PCB Figure 10 Insert PCB in standoff tighten 4 Screws Figure 2 Disconnect Ribbon...

Страница 40: ...the 2 screws on each side of door 8 7 3 Rotate door out from cabinet and tighten 4 screws Check to make sure that rope contacts muffle lip when closed and insulation clears cabinet when lifted 8 7 4 I...

Страница 41: ...fle holes Cut tie wraps located on terminals insulation Slide the piece of insulating sleeve provided over the existing ones and tie wrap at 1 below the heat shield It may take a few attempts to locat...

Страница 42: ...5 Remove two screws one each side 8 9 6 Pull pry out muffle assy with attached front panel from wraparound 8 9 7 Remove screw used to secure thermocouple and pull thermocouple from muffle 8 9 8 Remov...

Страница 43: ...details 8 10 3 Disconnect thermocouple from pyrometer 8 10 4 Remove nut Replace thermocouple by reversing previous steps and replace nut 8 11 THERMOCOUPLE 3 STAGE CONTROL TOOLS bladed screwdriver phi...

Страница 44: ...e furnace 8 12 4 Disconnect muffle wires Refer to wiring diagram 5 9 8 12 5 Disconnect thermocouple from circuit board 8 12 6 Pull pry out muffle assy with attached front panel from wraparound 8 12 7...

Страница 45: ...50 PD 8 ohms 8 ohms 24 ohms 8 13 THERMOCOUPLE 3 550 PD TOOLS bladed screwdriver phillips head screwdriver 1 4 nutdriver WARNING Disconnect power from the wall outlet before attempting to service the f...

Страница 46: ...t 8 13 5 Replace with new thermocouple by reversing previous steps 8 11 1 thru 8 11 4 8 14 POWER SWITCH TOOLS Slotted screwdriver 8 14 1 Follow steps 8 1 1 through 8 1 2 of CONTROL DRAWER REMOVAL 8 14...

Страница 47: ...which support rear panel 8 15 4 Remove the 2 screws to free motor linkage bracket from base 8 15 5 Disconnect wires Female quick connect terminals from motor 8 15 6 Remove 4 screws to free motor 8 15...

Страница 48: ...e original packaging Equipment damaged in shipment as a result of improper packing may not be paid by the carrier DENTSPLY will not be responsible for damages resulting from improper packing Ship prep...

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