Hitachi CM721FET Service Manual Download Page 19 | Manualshive

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4. TROUBLESHOOTING

Start

Check and repair EMI Filter

Check

Yes

and Q901-Q902

fuse

open

R932,R963,

DB901-DB904

Is

Check

and

repair

Q903

U903

Q903 VDS

No

D982, M907, M911, D912

Waveform normal?

Is 7.5V

No

Check Q902 D926 C937

In spec

U904 U908 VR901

Q909

Is B+voltage

No

Check Q902 Q921 D924 U902A

Correct?

Q909

202V
Ready is

Combine with

Monitor, check operation

frequency

OK

Stop

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Summary of Contents for CM721FET

Page 1: ...Service Ingenieur die Sicherheitshinweise und Hinweise zur Produktsicherheit in diesem Wartungshandbuch zu lesen SERVICE MANUAL MANUEL D ENTRETIEN WARTUNGSHANDBUCH Data contained within this Service manual is subject to alteration for improvement Les données fournies dans le présent manuel d entretien peuvent faire l objet de modifications en vue de perfectionner le produit Die in diesem Wartungsh...

Page 2: ...e without danger of electrical shock The service technician must make sure that no protective device built into the instrument by the manufacturer has become defective or inadvertently damaged during servicing CE MARK 1 HITACHI products may contain the CE mark on the rating plate indicating that the product contains parts that have been specifically approved to provide electromagnetic compatibilit...

Page 3: ...n doit s assurer qu aucun des dispositifs de protection intégrés à cet instrument par le fabricant n est défectueux ou n a été endommagé de façon accidentelle lors de l entretien LABEL CE 1 Les produits HITACHI peuvent avoir reçu le label CE qui figure sur la plaque signalétique pour indiquer que cet ensemble contient des composants qui ont fait l objet d une homologation spécifique de respect des...

Page 4: ...ass keine vom Hersteller im Gerät eingebaute Schutzvorkehrung schadhaft geworden ist oder bei der Wartung unabsichtlich beschädigt wurde CE KENNZEICHEN 1 HITACHI Produkte enthalten eventuell das CE Kennzeichen auf dem Leistungsschild welches angibt dass das Produkt Teile enthält die eigens zugelassen sind um bis zu einem spezifizierten Niveau elektromagnetische Störfreiheit zu bewirken 2 Wenn Sie ...

Page 5: ...NT 7 2 CONTROLS AND CONNECTORS LAYOUT 10 A MAIN PCB 10 B CRT B 11 C PIN ASSIGNMENT 11 3 CIRCUIT DESCRIPTION 12 A POWER SUPPLY 12 B POWER SUPPLY BLOCK DIAGRAM 12 C POWER SUPPLY CIRCUIT 13 D TDA4855 4858 AUTOSYSNC DEFLECTION CONTROLLER 14 FIGURE 4 5 14 E HORIZONTAL PROCESSOR 16 F VERTICAL PRE AMP 16 G HORIZONTAL DRIVE 17 4 TROUBLESHOOTING 18 A MONITOR CHECK FLOW CHART 19 APPENDIX A SCHEMATIC DIAGRAM...

Page 6: ...e properly adjusted at 15 F L with full intensity reverse pattern then switch to cross hatch pattern and place unit facing east Pincushion should be less than 2 0mm Barrel should be less than 2 0mm top bottom 1 5 left side right side Trapezoid should be less than 3 5mm Parallelogram should be less than 3 5mmTilt should be less than 1 2 degree E Alignment Procedure E 1 Brightness Adjust 1 Adjust th...

Page 7: ... 3 with full white pattern adjust OSD ABL SUB BRIGHTNESS to get full white light output 30 2 FL G Focus Adjustment G 1 Adjust brightness have the brightness of raster be 0 06FL and contraset be 30FL in timming 6 G 2 Adjust the G4a and G4b of theFBT have focus be in the best condition on the 1 4 diagonal of screen in timing 5 H Convergence Adjustment Input R B and R G signals make sure convergence ...

Page 8: ...rted all output voltage should be shut down and unlatch 3 when normal condition is recovered all output voltage should recover automatically J 4 Side Pincushion Tilt and Geometry Distortion Adjustment 1 Input timing 1 adjust the display be normal position and size 2 Adjust front control key to get the best pincushion distortion and tilt 3 Select P502 and adjust VR402 VR404 to get the best geometry...

Page 9: ... 70 09 31 78 14 27 25 422 12 711 1 907 1 112 3 813 0 064 0 636 0 381 4 VESA60 800 600 40 P P 37 88 60 32 26 4 16 58 20 15 84 2 2 0 607 3 2 0 106 1 0 025 5 VESA85 800 600 56 25 P P 53 674 85 061 18 631 11 756 14 222 11 179 2 702 0 503 1 138 0 056 0 569 0 019 6 VESA60 1024 768 65 N N 48 36 60 20 68 16 67 15 754 15 88 2 462 0 6 2 092 0 124 0 369 0 063 7 VESA75 1024 768 78 75 P P 60 023 75 029 16 66 1...

Page 10: ... 9 ...

Page 11: ... 10 2 CONTROLS AND CONNECTORS LAYOUT A Main PCB ...

Page 12: ...H CENTRE VR P701 TILT CONN JP1 PRESET CONN P902 DEGAUSSING COIL CONN P703 X RAY TEST PAD P302 P303 P301 P5 1 HFLB Vout DSUB9 DDC SCL 2 GND EEP SCL R IN DDC SDA 3 G1 EEP SCL GND GND 4 6 3V H OUT B IN V SYNC 5 5V GND GND H SYNC 6 76V G IN 7 12V GND 8 CONTRAST ...

Page 13: ... power supply is a universal switching mode power supply It consists of an off line flyback converter and a Boost converter The output voltage and current rating are 7 5V 0 81A 15 3V 0 84A 44V 0 2A 76V 0 2A and B 202V 0 4A B Power Supply Block Diagram ...

Page 14: ...Q902 low by delaying the voltage rise until drain current has decreased from its peak value This snubber also damps out any ringing which may occur due to parasitic C 3 SYNCHRONIZED CIRCUIT The oscillator frequency is defined by R912 C920 The equation is approximately Fosc 1 8 R912 C920 The external signal that comes from horizontal circuit synchronises the working frequency of power circuit Via U...

Page 15: ...er circuit The feedback points of U991A is not only connected to C906 but also the AC line in voltage of C901A which the voltage waveform shape is same as the line in voltage The follower booster circuit can smooth the input current to improve PF value D TDA4855 4858 AUTOSYSNC DEFLECTION CONTROLLER Figure 4 5 ...

Page 16: ...utput VPOS 17 V shift input VAMP 18 V size input VSCOR 19 vertical S correction input EWTRP 20 Ew trapezium correction input EWPAR 21 Ew parabola amplitude input VAGC 22 external capacitor for V amplitude control VREF 23 external resistor for vertical oscillator VCAP 24 external capacitor for vertical oscillator GNDS 25 ground signal ground HPLL1 26 external filter for PLL 1 HBUF 27 buffered f v v...

Page 17: ...he free run frequency is setting by R428 and C412 fvo 1 10 8 x R428 x C412 C445 the V position is controlled by the D C pin 17 and V size is controlled by D C pin 18 and the pin 19 is to ADJ VERT linearity F 1 VERT output circuit U601 TDA 8351 see Figure 6 The saw tooth is output from U401 pin 12 13 to the pins 1 and 2 of TDA8351 vert output amplifier and then output from pin 7 to the vert DY for ...

Page 18: ...FBT and input to U801 PWM modulator IC to drive Q801 When Q801 turns on the energy is stored in the FBT When Q801 turns off the resonate circuit creates a pulse to the FBT to generate a HV 25KV 26KV and G5 voltage 6 1 7 8KV and G1 voltage 180V and 32V for X RAY protection and 300V for dynamic focus H Video Amp Circuit H 1 Video PRE AMP U301 M52743 is the Video PRE AMP The input signal is 0 7Vp p t...

Page 19: ...en R932 R963 DB901 DB904 Is Check and repair Q903 U903 Q903 VDS No D982 M907 M911 D912 Waveform normal Is 7 5V No Check Q902 D926 C937 In spec U904 U908 VR901 Q909 Is B voltage No Check Q902 Q921 D924 U902A Correct Q909 202V Ready is Combine with Monitor check operation frequency OK Stop ...

Page 20: ... 19 A Monitor Check Flow Chart A 1 No raster ...

Page 21: ... 20 A 2 No Picture ...

Page 22: ... 21 A 3 No vertical deflection raster become a horizontal line ...

Page 23: ... 22 APPENDIX A SCHEMATIC DIAGRAMS PCB ASSEMBLIES ...

Page 24: ...L30 BEAD 8MHz Y1 GND SW1 R1 4 7K R13 100 SW5 10V 100U C9 SW4 SW3 SW2 GND 100P C40 O G I 7805 U3 R4 1 5 1K 5 4 3 2 1 P3 R69 10K R8 1 10K 4 7K R80 4 3 2 1 P2 2SC945 Q1 2W 3 3 R100 C25 4 7U R68 10K R14 100 4 7U C29 4 7U C30 4 7U C21 4 7U C20 4 7U C19 5 6k R35 220P C37 GND GND 4 7U C24 BEAD L8 BEAD L7 XX R73 BEAD L5 BEAD L6 1N4148 D8 1N4148 D6 GND GND 1N4148 D7 1N4148 D9 GND 1N4148 D11 1N4148 D10 1N41...

Page 25: ...W 10K 100P C443 C406 25V NP 10U GND GND 56K 1 4W R454 HZ5C1 ZD404 2 1500P MEF C428 22K 1 4W R459 Q442 2SD667 C427 16V 100U R732 1 7 32K GND R437 620K R420 27K GND R407 1 4W 13K C604 63V 100U 470P C433 GND MEF 01U C416 R406 2 2M R471 1 18 2K R409 270K 1N4148 D430 R466 1 4W 680K MEF 012U C417 20K VR405 R444 330K 1 4W 100 R621 R418 1 2K 1 4W GND GND R442 4 7K R434 150K 1 4W R494 1 4W 100 R440 270K 2S...

Page 26: ...1 4W GND D802 UF5408G 1 4W 2 2K R520 GND GND 1 2W 220 R522 GND R561 10 1W GND XX C821 P803 L509 BEAD 1 4W 10 R802 330 1 4W R816 MPA 400V 27U C520 2200P C810 R839 150K R814 FUSE 1 4W 10 C833 25V 47U 10K 1 4W R509 RN1203 Q508 GND PPN 3300P C531 R861 1 2W 240K 100 R530 XX C554 XX C555 R535 2W 4 7 GND GND 4 7K R545 GND 1N4148 D528 1SS82 D505 GND RN1203 Q525 GND GND RN1203 Q510 1 4W 2 2K R549 100 R541 ...

Page 27: ...964 1 4W 1KF R942 A K R U904 TL431 T902 Q960 RN1206 4148 D911 1 4W 10K R917 ZD902 4 7K R991 D930 4148 100UH L904 1 5K R995 A952L Q990 16V 47U C959 2 5 4 8 1 3 6 7 U901 3842 ER302 D942 1KV 331 C963 472Y C981 3 2 1 P901 SOCKET 1 4W 4 7K R992 102Y2 C93A GND5 GND1 GND1 GND1 104Z C910 GND5 C945 Q991 25V 22U C990 4 7K R999 103 C914 MEF 332 C920 GBU4J DB901 GND5 102Y2 C931 GND1 1W 180K R960 25VA 1OOU C91...

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Page 31: ...THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA ...

Page 32: ... 50 APPENDIX C DISPLAY UNIT ASSEMBLY ...

Page 33: ......

Page 34: ...31 1 008 LOCKING CABLE TIE 142MM 009 CUSHION 2 H76748 010 RUBBER WASHER F56146 T 4 0MM SHORE 50 011 SCREW M4X0 7 8CF MC EX LOCK WASHER 012 TAPPING SCREW TPB 4 20N MC 013 SCREW TPP 3 10C MC 016 POWER LED LENS V99941 017 LOCKING CABLE TIE W2 5XL203 WHITE YJ 203S 018 COPPER PAPER CRT H99944 020 SCREW TPB 5 24P MC 025 SCREW TPP 3 6C MC M01 SCREW M4X0 7 8C MC M02 SCREW M4X0 7 8P MC ADD WASHER M03 SCREW...

Page 35: ... 53 APPENDIX D CRT YOKE ASSEMBLY CRT YOKE Assembly 001 CRT YOKE M46QCK761X123 SAM AC500025600 002 H CON SET H999 CRT GND AROUND W5 6 DC020133320 ...

Page 36: ......

Page 37: ... ITALY Tel 39 02 487861 Tel 39 02 38073415 Servizio Clienti Fax 39 02 48786381 2 Email customerservice italy hitachi eu com HITACHI Europe AB Box 77 S 164 94 Kista SWEDEN Tel 46 0 8 562 711 00 Fax 46 0 8 562 711 13 Email csgswe hitachi eu com HITACHI EUROPE S A S Lyon Office B P 45 69671 BRON CEDEX FRANCE Tel 04 72 14 29 70 Fax 04 72 14 29 99 Email france consommateur hitachi eu com HITACHI EUROPE...

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