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KX-MB772CX-V1
CROSS REFERENCE: Test Functions (P.89)
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CROSS REFERENCE: Test Functions (P.89)
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CROSS REFERENCE: Test Functions (P.89)
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CROSS REFERENCE: Test Functions (P.89)
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12.3.13. Initializing Error
After the power is turned on, the SOC (IC300) initializes and checks each IC. The ROM (IC402) and SDRAM (IC400) are checked. If initialization fails for the ICs, the system will not boot up. In this case, please find the cause as follows.
CROSS REFERENCE: NG Example (P.238) Power Supply Board Section (P.69)
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12.3.14. Analog Section and Monitor Section
This chapter provides the testing procedures required for the analog parts. A signal route to be tested is determined depending upon purposes. For example, the handset TX route begins at the handset microphone and the signal is output to the telephone line. The signal mainly flowing on this route is analog. You can trace the signal with an oscilloscope. The signal flow on each route is shown in the Check Sheet here. If you find a specific problem in the unit, for example if you cannot communicate with the H/S, trace that signal route locally with the following Check Sheet and locate the faulty point.
12.3.14.1. Check Sheet
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12.3.14.2. DEFECTIVE ITS (Integrated Telephone System) Section
1. No handset and speakerphone transmission / reception Perform a signal test in the ITS or the NCU section and locate a defective point (where the signal disappears) on each route between the handset microphone and telephone line (sending), or between the telephone line and the handset speaker (receiving), or between the microphone and the telephone line (sending), or between the telephone line and the speaker (receiving). Check the components at that point. Check Sheet(P.158) is useful for this investigation. 2. No pulse dialing
3. No ring tone (or No bell)
CROSS REFERENCE: Check Sheet (P.158) NCU Section (P.29) 4. No tone dialing
CROSS REFERENCE: Check Sheet (P.158) 159
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12.3.14.3. Detective TAM Interface Section
1. The FAX turns on, but does not arrive through TAM.
CROSS REFERENCE: TAM Interface Section (P.31) 2. A FAX is received, but won't switch from TAM to FAX.
CROSS REFERENCE: Analog Section and Monitor Section (P.158) TAM Interface Section (P.31)
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12.3.15. Operation Panel Section
Refer to Test Functions (P.89). 1. NO KEY OPERATION
2. NO LCD INDICATION
CROSS REFERENCE: Test Functions (P.89)
12.3.16. Sensor Section
Refer to SENSORS AND SWITCHES for the circuit description. Perform an SENSOR CHECK to determine if the sensor is operating correctly. 1. Check the pickup sensor .......... "FAILED PICKUP"
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2. Check the paper exit sensor.......... "PAPER JAMMED"
3. Check the read position sensor .......... "CHECK DOCUMENT"
4. Check the registration & manual paper sensor .......... "PAPER JAMMED"
5. Check the print timing sensor .......... "PAPER JAMMED"
6. Check the document sensor
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7. Check the top cover sensor .......... "TOP COVER OPEN"
8. Check the toner sensor .......... "TONER LOW", "CHANGE DRUM"
9. Check the handset hook switch
CROSS REFERENCE: Sensors and Switches Section (P.48)
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12.3.17. Motor Section 12.3.17.1. Engine Motor
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12.3.17.2. Scanner (FB and ADF) motor
In the following flow chart, description of "ADF motor" or "Relay" are applicable for ADF equip model only.
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12.3.17.3. FB MOTOR
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12.3.18. LSU Section
CROSS REFERENCE: LSU (Laser Scanning Unit) Section (P.46)
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12.3.19. CIS Control Section
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CROSS REFERENCE: Test Functions (P.89)
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12.3.20. High Voltage Value Check Point
Measurement Procedure 1. Turn Off the unit, and open the unit cover. 2. Remove the developing unit, if it is equipped. 3. Connect the wire to the terminal to be measured (Fig. 2). The wire should be put out of the unit not to interfere in other terminals (Fig. 3). See Fig 4 and 5 for fixing the wire to the terminal No.4. 4. Reinstall the developing unit and close the unit cover. 5. Connect the wire fixed to the terminal to be measured and high voltage probe. Connect the earth of the high voltage probe to the screw located under the bottom plate of the unit without the paper cassette. (Fig.7). 6. Turn On the unit. It causes the unit to start the initial operation. Be careful, high voltage is output at that moment. (Avoid measuring then.) 7. The unit enters the service mode. Then push *556_0. 8. Push the SET button. (High voltage will be added to the unit in the hereafter. Avoid touching the wire and the tip of high voltage probe where high voltage is supplied.) 9. When the measurement is finished, push the STOP button. (The high voltage output is stopped.) 10. Remove the wire fixed to the output terminal after measuring.
Each terminal's output voltage
No. 1 2 3 4 BIAS Name CHG (Charge) GRID (Grid) DEV (Developing) TRA (Transfer) Rated Output 200µA 475V 230V 785V Rated Output Range 200±15µAOutput voltage about 4.1~4.6KV 475± 10V 200~300V 785± 100V
* FLUKE85 (MULTIMETER) + HIOKI (HV PROVE 9014) or the equivalent should be used as the high voltage measuring instrument. (Fig.6) * As for measuring TRA, start measuring within 4 seconds after pressing the SET button. The output value will be changed in 4 seconds.
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12.3.21. High Voltage Section
1. Main
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2. CHG, GRID
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3. TRA (+)
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4. DEV DC
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TRA (-)
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12.3.22. USB Section
Troubleshooting 1. Confirmation of the PC settings
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2. Confirmation of the main unit
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USB (Universal Serial Bus) block Description This is a USB block for data communication with PC. Two signal lines (D+/D-) are differential signals which work in reverse phase. VBUS: CN300 1pin D+: CN300 3pin D-: CN300 2pin GND: CN300 4pin Circuit Diagram
Sequence of normal operation When USB cable from PC is connected to CN300, VBUS voltage goes up to 5V, and IC300 recognize the connection with PC. Then D+ becomes about 3V : waveform (1)-1 The D+ becomes 0V, then communication between IC300 and PC is started : waveform (2)-1 When a few seconds elapsed after USB cable was inserted into CN300,the unit enters stand-by mode. When PC is at Hi-Speed, waveforms are (1)-1 ~ (1)-4. When PC is at Full Speed,waveforms are (2)-1 ~ (2)-4.
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Waveform of normal operation
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12.3.23. Main Board Section
3.3V / 1.2V Troubleshooting Guide (1)
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3.3V / 1.2V Troubleshooting Guide (2)
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12.3.24. Power Supply Board Section 12.3.24.1. Key Components For Troubleshooting
Check the following parts first: F1, F2, D10-D13, C5, Q1 and PC1. This comes from our experience with experimental test. For example: power supply and lightning surge voltage test, with standing voltage test, intentional short circuit test, etc. Caution: If you find a melted fuse in the unit, do not turn on the power until you located and repair the faulty parts (except for the fuse); otherwise the fuse will melt again and you cannot pinpoint the faulty point. In most cases, the symptom is that nothing is output. It is more likely that the fault is in the primary side rather than the secondary side. Check the primary side first.
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12.3.24.2. Troubleshooting Flow Chart
12.3.24.3. Broken Parts Repair Details
(D10~D13) Check for a short-circuit in terminal 4. If D10~D13 is short-circuit, F2 will melt (open). In this case, replace all of the parts (D10 - D13, F2). (D101) If D101 is broken, the oscillation circuit in the power supply cannot operate. Check it with an electric tester.
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12.4. DOCUMENT JAMS (AUTO DOCUMENT FEEDER)
Caution:
· Do not pull out the jammed document forcibly before lifting the ADF cover.
1.
Open the ADF cover (1) while holding the document cover (2).
2.
Remove the jammed document (3) carefully. When the document has jammed near the document entrance:
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When the document has jammed near the document exit:
3.
Close the ADF cover.
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12.5. RECORDING PAPER JAM
12.5.1. When the recording paper has jammed inside of the unit
The display will show the following.
Caution:
· Do not pull out the jammed paper forcibly before opening the top cover.
Case 1: When the recording paper has jammed near the manual input tray: 1. Pull open the paper input tray (1).
2. Open the manual input tray (2) and remove the jammed paper (3) carefully by pulling it upwards. Then close the manual input tray.
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3. Close the paper input tray. · Open and close the top cover (4) to clear the error message.
Case 2: When the recording paper has jammed near the drum and toner unit: 1. Pull open the paper input tray (1).
2. Lift the top cover release lever (2) and open the top cover (3).
Note:
· Do not touch the transfer roller (5)
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3. Remove the jammed paper (6) carefully by pulling it upwards.
Remove the jammed paper (7) carefully by pulling it toward you.
4. Close the paper input tray.
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5. Close the top cover until locked.
Caution: · To prevent injuries, be careful not to put your hands under the top cover.
Case 3: When the recording paper has jammed near the fuser unit: 1. Lift the top cover release lever (1) and open the top cover (2).
Note:
· Do not touch the transfer roller (4).
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2. Lift both green levers (5) until they stop.
3. Remove the jammed paper (6) carefully by pulling it upwards.
4. Push back the green levers (7) to the original position.
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5. Close the top cover until locked.
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12.5.2. When the recording paper is not fed into the unit properly
The display will show the following.
1. 2.
Pull the paper input tray until it clicks into place, then put it completely out, lifting the front part of the tray. Remove the recording paper and straighten. Re-load the recording paper.
3.
Insert the paper input tray to the unit, lifting the front part of the tray. Then push it completely into the unit.
Note: · If the error message is still displayed, check the recording paper specifications and re-install recording paper.
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12.5.3. When the recording paper in the manual input tray is not fed into the unit properly
The display will show the following.
1. 2.
Remove the recording paper. Re-insert the recording paper.
Note: · If the error message is still displayed, check the recording paper specifications and re-install recording paper.
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13 Service Fixture & Tools
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14 Disassembly and Assembly Instructions
Note: Remove the Document Cover, the Paper Input tray and the drum and toner cartridge before reassembling. Handset is omitted from disassembly instruction.
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14.1. ADF Section
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14.2. Remove ADF Section (1)
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14.3. Remove ADF Section
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14.4. Remove Top Cover Section
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14.5. Remove Scanner Glass Section
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14.6. Remove Operation Panel Section
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14.7. Left Side Section
14.8. Remove Main Board
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14.9. Remove Gear Chassis Section
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14.10. Remove Paper Feed Roller
14.11. Right Cover Section
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14.12. Remove Right Side Cover Section
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14.13. Lower Side Cabinet Section
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14.14. Remove Right Cassette Guide
14.15. Remove Pick Up Board
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14.16. Remove High Voltage Power Board
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14.17. Remove Pick up Roller Unit
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14.18. Remove Low Voltage Power Board
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14.19. Remove Fuser Unit
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14.20. Installation Position of The Lead
14.20.1. Main Board Section
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14.20.2. Bottom Part Section
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14.20.3. Side Cabinet Section
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14.20.4. High Voltage Power Supply Board Section
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14.20.5. Low Voltage Power Supply Board Section
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14.20.6. AC Inlet Section
14.20.7. Solenoid Lead Section
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