Hitachi DV-P303U Page 50 Service Manual Download

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6-1

6. Circuit Descriptions

6-1 S.M.P.S.

6-1-1 Comparsion between Linear Power Supply and S.M.P.S.

6-1-1 (a) Linear

Vreg

Vout

–

(Ns)

(Np)

REGULATOR

Common power

(Ex.120/220V 50/60Hz)

Fig. 6-1 Linear Power Supply

•

Waveform/Description

Fig. 6-2

Fig. 6-3

Vout

Fig. 6-4

Input : Common power to transformer (Vp).

The output Vs of transformer is determined by the ratio
of 1st Np and 2nd Ns.
Vs = (Ns/Np) x Vp

Vout is output (DC) by diode and condensor.

Summary of Contents for DV-P303U

Page 1: ...ia Products Division Tokai DV P305U DV P303U 1 Precautions 2 Reference Information 3 Product Specification 4 Operating Instructions 5 Disassembly and Reassembly 6 Circuit Descriptions 7 Troubleshooting 8 Exploded Views 9 Replacement Parts List 10 Block Diagram 11 PCB Diagrams 12 Wiring Diagram 13 Schematic Diagrams CONTENTS ...

Page 2: ...Laboratories UL 1270 40 7 With the instrument s AC switch first in the ON position and then in the OFF position measure from a known earth ground metal water pipe conduit etc to all exposed metal parts of the instrument antennas handle brackets metal cabinets screwheads metallic overlays control shafts etc especially any exposed metal parts that offer an electrical return path to the chassis Any c...

Page 3: ...of place or frayed wiring Do not change spacing between a component and the printed circuit board Check the AC power cord for damage 5 Components parts and or wiring that appear to have overheated or that are otherwise damaged should be replaced with components parts and or wiring that meet original specifications Additionally determine the cause of overheating and or damage and if necessary take ...

Page 4: ...last 2 The service precautions are indicated or printed on the cabinet chassis or components When servicing follow the printed or indicated service precautions and service materials 3 The components used in the unit have a specified flame resistance and dielectric strength When replacing components use components which have the same ratings Components i entified by shading by or by in the circuit ...

Page 5: ... the assembly 3 Use only a grounded tip soldering iron to solder or unsolder ESD devices 4 Use only an anti static solder removal devices Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement...

Page 6: ...s gives them the same ground as the sheet 4 Remove the optical pick up block 5 Perform work on top of the conductive sheet Be careful not to let your clothes or any other static sources to touch the unit Be sure to put on a wrist strap grounded to the sheet Be sure to lay a conductive sheet made of copper etc Which is grounded to the table Fig 1 3 6 Short the short terminal on the PCB which is in ...

Page 7: ...nto Main PCB DCN1 See Fig 1 4 3 Disassemble the deck 4 Disassemble the deck PCB 1 5 2 Assembly 1 Replace the Pick up 2 Assemble the deck PCB 3 Reassemble the deck 4 Insert FPC into Main PCB DCN1 and switch SW3 on deck PCB to ON See Fig 1 4 FPC TO MAIN PCB DCN1 Note If the assembly and disassembly are not done in correct sequence the Pick up may be damaged Fig 1 4 ...

Page 8: ...put for the Serial Control Mode Chip select is active when SMUTE is low 9 DFS I Double Sampling Speed Input When low this pin defines the Normal Speed Mode and 128 xFs oversampling is implemented When high the DFSpin defines the Double Speed Mode implemented with 64 x Fs oversampling This pin features an internal pull down 10 DEM0 or CCLK I De emphasis Enable 0 or Control Data Clock Input If the P...

Page 9: ...SDATA 3 _OUT C2PO SDATA 4 _OUT S Q DT SDATA 5 _OUT W FSY SDATA 6 _OUT S 0 S1 SDATA 7 _BI SQ CK DATREQ _ IN CSTROB E _ OUT DTER_OUT DATACK_OUT TOS _ OUT Mon i tor 9 GFS_OUT FRSY Z_ OUT TX_OUT EFM O_ OUT W FCK_ OUT RFCK_ OUT CK1 6M_OUT DEMPHA_ OUT CLVLOCK_ OUT ECSY CD CLV CAV 23BIT SR Frame Sync DET PROT INS 7 35KHz VCO Tim ing Generator M M W FCK 17 58 7 3 5KHz 32 28 5 28 24 5 CIRC EFM DEMOD SUBCOD...

Page 10: ... GND 0 V 85 DVDD DIGITAL Power 5 V 86 DVDD DIGITAL Power 5 V 87 DVSS Digital GND 0 V 88 DVSS Digital GND 0 V 89 DVSS Digital GND 0 V 90 DVSS Digital GND 0 V 91 FRSYZ_OUT Frame Sync Out O Monitor 92 TX_OUT Digital Out O Monitor No Pin Name Description I O 46 DADR7_OUT DRAM Address Bus O DRAM 47 DVSS Digital GND 0 V 48 DADR0_OUT DRAM Address Bus O DRAM 49 DADR6_OUT DRAM Address Bus O DRAM 50 DADR1_O...

Page 11: ...D8 RAS NO 2 CLOCK GENERATOR CONTROL LOGIC COLUMN DECODER SENSE AMPLIFIERS VO GATING ROW DECODER 512x512x16 MEMORY ARRAY 512 512 DATA IN BUFFER DATA OUT BUFFER REFRESH CONTROLLER REFRESH COUNTER NO 1CLOCK GENERATOR ROW ADDRESS BUFFERS 9 COLUMN ADDRESS BUFFER OE Vcc Vss IO0 IO15 16 9 8 8 9 9 9 9 16 512x16 ...

Page 12: ...ess Strobe 28 CASH Input Column Address Strobe Upper Byte Control 29 CASL Input Column Address Strobe Lower Byte Control 13 WE Input Write Enable 27 OE Input Output Enable 2 5 7 10 31 34 36 39 I O0 I O15 Input Output Data Input Output 1 6 20 Vcc Supply Power 5V 21 35 40 Vss Ground Ground 11 12 15 30 NC No Connect ...

Page 13: ...R TIMER 6 8BIT TIMER TIMER 7 Not included in TMP95C265 64KB ROM 2KB ROM WATCHDOG TIMER PC SR XWA XBC XDE XHL XIX XIY XIZ XSP W 900 H CPU A B C D E H IX OSC PORT0 PORT1 PORT2 PORT3 PORT4 PORT5 CS WAIT CONTROLLER 4 BLOCK INTERRUPT CONTROLLER 16BIT TIMER TIMER 8 16BIT TIMER TIMER 9 IY IZ SP L 32bit F VCC 3 VSS 3 X1 X2 P00 P07 D0 D7 P10 P17 D8 D15 P20 P27 A15 A23 P30 P37 A8 A15 P40 P47 A0 A7 WAIT P55 ...

Page 14: ...or from DSP I KS1453 108 98 PA6 FOKB Focus lock monitor from RF I KS1461 48 99 PA7 RFO RF sum signal Analog Lnput I RFO 100 VREFH 5D A D Ref Input H I 5D NO PORT NAME ASSIGNED NAME DESCRIPTION TYPE REMARK 1 VREFL DGND A D Ref Input L I DGND 2 AVss DGND A D Ref Input DGND 3 AVcc 5D A D VCC Input 5D 4 DAOUT0 MTP1 0 NC 5 DAOUT1 MPT2 0 NC 6 NMI PULL UP I 7 P53 CSB D Servo IC Chip Select 0 KS1452 10 8 ...

Page 15: ...0 11 12 13 14 15 16 A16 A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 Vss Vcc A17 A14 A13 A8 A9 A11 GVPP A10 E Q7 Q6 Q4 Q4 Q3 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 TOP VIEW Vcc Vss LOGIC DIAGRAM FUNCTION Address Inputs Chip Enable Data Outputs Output Enable Program Supply Supply Voltage Ground A19 A18 GVpp E A0 A19 A0 Q7 20 8 ...

Page 16: ... O8 A13 A15 A16 VCC VSS CS1 WE OE Control logic CS2 Data cont N C A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 I O1 I O2 I O3 VSS VCC A15 CS2 WE A13 A8 A9 A11 OE A10 CS1 I O8 I O7 I O6 I O5 I O4 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name Function Name Function CS1 CS2 Chip Select Inputs I O1 I O8 Data Inputs Out OE Output Enable Vcc Power WE Write Enable Vss...

Page 17: ...PC ACC Bus Interface Base Timer SIO 0 SIO 1 Timer 0 Timer 1 VFD Controller ADC INT0 3 Noise Filter Real Time Service XRAM 128 bytes High Voltage Output Port 1 Port 7 Port 8 Port 2 Port 3 Port 4 Port 5 PWM 1 B Reg PSW RAR RAM Stack Pointer PORT 0 Watch Dog Timer C Reg ALU ROM IR PLA RC Clock Generator X tal ...

Page 18: ... SAVE MODE POWER 97 P46 0 AMUTE1 REAR MUTE AUDIO 98 P47 0 AMUTE0 FRONT MUTE AUDIO 99 P50 0 LED STANDBY LED LED 100 P51 0 ON OFF POWER ON OFF CONTROL POWER NO PORT NAME TYPE ASSIGNED NAME DESCRIPTION REMARK 1 P52 0 MRST Front end reset RESET 2 PWM1 TP1 NC 3 P20 0 CS1 Chip Select 1 AK4393 4 P21 0 CCLK Control Data Clock AK4393 AK4356 5 P22 0 CDTI Control Data AK4393 AK4356 6 P23 0 CS2 Chip Select 2 ...

Page 19: ...TH EQF RDPF VZOCTL AGCC RFCT EQGND CP1 MIRRI RFRPN CP2 CB2 RFRP AGCP AGCB CB1 MROFST EQIN RREFDLY VREF GENERATOR RREFBF RREF RREFEQ EQ VC AMP 58 60 59 57 65 62 63 61 64 68 67 66 69 S I F BLO C K CD1 S12 DVD1 DVD2 LDONB FLT_CTL CDRSEL TESEL AGCHOLD TBAL GAIN_TE3 ENV_SEL DVCTL_SEL DPD_MUTE GAIN_EQ GAIN_FE GAIN_ABCD TE_OFST FE_OFST ABCD_OFST DELAY_CD DELAY_AB PDLIM IT ga_RFSUM HOLD_CTL ga_PLLDP ga_PL...

Page 20: ...Focus OK comparator output terminal L Focus OK FOKB DSSP 47 DFCT_CP1 Connection terminal for RC value of Peak Hold for selecting the maximum time for Servo signal DFCT 48 DFCT_CP2 Connection terminal for RC value of Peak Hold for selecting the minimum defect time for PLL DFCT 49 CC1 O Peak Hold Output terminal for selecting the minimum Defect time for Defect DFCT 50 CC2 I Peak Hold AC Coupling Inp...

Page 21: ...TOP PS0 PS1 LOCK SMON MIRR FOKB DFCT I O IN TER FACE BLOC K D AB C SB M D ATA 7 0 M W R B SEN SE SYSC ON IN TER FACE BLOC K R OM D SP C OR E F OR D IGIT AL SER VO PL CK R VC O VC TR L EQC TL W ID E C APTU RE R ANGE PLL L D ON B PSB RSTB TEST TZCA M R D B EF M ASYMM ETR Y R FI ASY C D XOUT TILTI TILTO EFM EFM R TD R PD PL LLOC K M D OU T 3 0 DIRC ASY D VD EFM I D VC TL M AG I C 0 IN T0_224 PL LHD R...

Page 22: ... zero cross input pin 78 MDOUT0 O Mode data0 out controlled by micom 79 MDOUT1 O Mode data1 out controlled by micom 80 MDOUT2 O Mode data2 out controlled by micom No Name I O Description 1 MDOUT3 O Mode data3 out controlled by micom 2 SSTOP PS0PS1 I Limit switch sled position sensor input pin0 3 PS1 I Sled motor position sensor input pin1 4 TEST I Test pin L normal H test 5 COUT O Counter clock 6 ...

Page 23: ... Values TSD Detector Direction Detector Hall amp matrix Direction select Power Save Short vrake Lower Distributor Upper Distributor MUTE MUTE MUTE 2P 2P 2P 2P 2P 2P 2P 2P 2P 10k 10k 10k 10k PWRGND A3 A2 A1 OPIN OPIN OPOUT VCC1 AVM12 DI4 DI3 DI2 FIN GND FIN GND H3 H3 H2 H2 H1 H1 BTLSGND BIAS AVM4 MUTE12 MUTE3 MUTE4 DI1 DO1 DO1 DO2 DO2 BTLPGND1 BTLPGND2 DO3 DO3 AVM3 DO4 DO4 FIN GND SB DIR SS CS1 VM ...

Page 24: ...L CH 1 2 MOTOR SUPPLY VOLTAGE 22 DI4 I BTL DRIVE INPUT 4 23 DI3 I BTL DRIVE INPUT 3 24 DI2 I BTL DRIVE INPUT 2 25 DI1 I BTL DRIVE INPUT 1 26 DO1 O BTL DRIVE 1 OUTPUT 27 DO1 O BTL DRIVE 1 OUTPUT 28 DO2 O BTL DRIVE 2 OUTPUT 29 DO2 O BTL DRIVE 2 OUTPUT 30 BTLPGND1 BTL POWER GROUND 1 31 BTLPGND2 BTL POWER GROUND 2 32 DO3 O BTL DRIVE 3 OUTPUT 33 DO3 O BTL DRIVE 3 OUTPUT 34 AVM3 BTL CH3 MOTOR SUPPLY VOL...

Page 25: ...am Stream Decoder Host Interface Audio Interface DVD CD Interface MPEG Video Decoder Subpicture Decoder OSD Decoder CD DA and LPCM Decoder Dolby Digital Audio Decoder MPEG Audio Decoder Memory Controller Host Interface Control Logic SecureView CSS Descrambling Bus Key Authentication optional Video Mixer Video Out Digital Video Encoder ...

Page 26: ...O 100 VDD_3 3 3 3V 101 VSS GROUND 102 MADDR1 3 3V O 103 MADDR2 3 3V O 104 MADDR3 3 3V O 105 RESERVED ANALOG GND 106 NC No connect O 107 NC No connect O 108 RESERVED 3 3V I 109 NC No connect O 110 RESERVED 3 3V I 111 RESERVED 3 3V ANALOG 112 RESERVED 3 3V I 113 DAI LRCK 3 3V I O 114 DAI BCK 3 3V I O 115 VDD_3 3 3 3V 116 VSS GROUND 117 DAI DATA 3 3V I O 118 DA DATA3 3 3V O 119 DA DATA2 3 3V O 120 DA...

Page 27: ...V I 196 RESERVED 3 3V I 197 HDATA7 3 3V I O 198 VSS GROUND Pin No Pin Name I O Voltage I O Type 199 HDATA6 3 3V I O 200 HDATA5 3 3V I O 201 HDATA4 3 3V I O 202 HDATA3 3 3V I O 203 HDATA2 3 3V I O 204 VDD_3 3 3 3V 205 VSS 3 3V 206 HDATA1 3 3V I O 207 HDATA0 3 3V I O 208 CS 3 3V I Pin No Pin Name I O Voltage I O Type ...

Page 28: ...uld be enabled at least one cycle prior to new command Disable input buffers for power down in standby A0 A10 AP Address Row column addresses are multiplexed on the same pins Row address RA0 RA10 column address CA0 CA7 BA Bank Select Address Selects bank to be activated during row address latch time Selects bank for read write during column address latch time RAS Row Address Strobe Latches row add...

Page 29: ...Reference Information 2 22 MEMO ...

Page 30: ...8Cm Reading Speed 1 2to 1 4 m sec Compact Disc Maximum Play Time 20min VCD 12Cm Reading Speed 1 2 to 1 4 m sec Maximum Play Time 74min Video Audio Composite Video 1 channel 1 0Vp p 75ohm load Y 1 0Vp p 75ohm load DV P305U Only Video Output Component Video Pr 0 70Vp p 75ohm load DV P305U Only Pb 0 70Vp p 75ohm load DV P305U Only S Video Luminance Signal 1Vp p 75ohm load Color Signal 0 286Vp p 75ohm...

Page 31: ...Product Specification 3 2 MEMO ...

Page 32: ...nly MPEG 2 Audio output Displays various messages concerning operations such as PLAY STOP LOAD RANDOM no DISC No disc loaded OPEN The disc tray is open LOAD Player is loading disc information 8 D escription Front Panel Front Panel Controls STANDBY ON When the unit is first plugged in the indicator lights When STANDBY ON is pressed the lamp goes out and the player is turned on DISC TRAY Press OPEN ...

Page 33: ...Menu on a disc TOP MENU Button Brings up the Top Menu on a disc ENTER DIRECTION Button UP DOWN or LEFT RIGHT Button STEP Button Advances playback one frame at a time AUDIO Button Accesses various audio functions on a disc OPEN CLOSE Button To open or close the disc tray 3D SOUND Button To activate the 3D sound ZOOM Button To magnify part of picture CLEAR Button Removes menus or status displays fro...

Page 34: ...T VIDEO OUT SELECT SWITCH Use the switch to set video out If the Y Pb or Pr is selected the S Video may not work If the S Video is selected the Y Pb or Pr may not work COMPONENT VIDEO OUT Y Pr Pb VIDEO OUT S VIDEO OUT MIXED AUDIO OUT R L OPTICAL COAXIAL DIGITAL AUDIO OUT S VIDEO Y Pb Pr VIDEO OUT SELECT C hoosing a Connection 13 Connection to an Audio System The following show examples of connecti...

Page 35: ...1 DVD Player TV with Video Input Jack Method 2 DVD Player TV with S Video Input Jack If the S Video is selected in the VIDEO OUT SELECT Method 3 DVD Player TV with Component Video Jacks If the Y Pb or Pr is selected in the VIDEO OUT SELECT TV Normal Widescreen Projection etc Connection to a TV For Video Analog Audio out Good picture Basic Audio OR OR AV Cable included S Video Cable optional Video ...

Page 36: ...1 1 Top Cabinet Removal 1 Remove 3 Screws 1 on the back Top Cabinet 2 Remove 2 Screws 2 3 on the left and right side 3 Lift up the Top Cabinet in direction of arrow 3 SCREWS 1 SCREW 1 SCREW 1 3 2 Fig 5 1 Top Cabinet Removal Note Reassembly in reverse order ...

Page 37: ...2 in direction of arrow A 3 Close Tray 1 and power off Note If Tray 1 doesn t open insert a Screw driver 4 into the Emergency hole 3 as shown in detailed drawing and then push it in the direction of arrow B Open Tray manually EMERGENCY HOLE Side View TRAY DOOR TRAY A SCREW DRIVER B 1 3 4 2 Fig 5 2 Door Tray Removal ...

Page 38: ... PCB ASS Y KNOB POWER 1 SCREW ASS Y FRONT PANEL 1 3 4 5 2 Fig 5 3 Ass y Front Panel Key PCB Removal 5 1 3 Ass y Front Panel Key PCB Removal 1 Remove Ass y Front Panel 1 2 Remove 1 Screw 2 and Ass y Knob Power 3 3 Remove 5 Screws 4 and Key PCB 5 ...

Page 39: ...emoval 1 Remove 4 Screws 1 from the Ass y Deck and lift it up CAUTIONS 1 When disassembling switch the SW3 to OFF on the Deck PCB and remove the FPC connected to DCN1 on Main PCB 2 When assembling insert the FPC into the DCN1 on Main PCB and switch SW3 to ON on the Deck PCB Fig 5 4 Ass y Deck Removal ...

Page 40: ... SCREWS JACK PCB MAIN PCB 1 SCREW 3 SCREWS 2 3 4 5 1 Fig 5 5 Main PCB Jack PCB Removal 5 1 5 Main PCB Jack PCB Removal 1 Remove 1 Screw 1 2 Remove 2 Screws 2 and lift up the Jack PCB 3 3 Remove 3 Screws 4 and lift up the Main PCB 5 ...

Page 41: ...5 6 Disassembly and Reaasembly MAIN PCB JACK PCB KEY PCB 5 2 PCB Location Fig 5 6 PCB Location ...

Page 42: ... PCB JACK PCB KEY PCB DECK ASS Y NO CONNECTOR NO DIRECTION CONNECTOR NO NO CON21 KEY PCB JACK PCB CN2 PCNS1 JACK PCB MAIN PCB PCN1 FPC DECK ASS Y MAIN PCB DCN1 CN1 JACK PCB MAIN PCB CN8 CT1 CT2 CT3 CT4 CT2 CT3 CT1 CT4 5 5 3 Connector Diagram Fig 5 7 Connector Diagram ...

Page 43: ...sconnect CN3 3 CN2 4 3 Remove 1 Screw 5 and lift up the PCB Deck 6 4 Remove 1 Screw 7 5 Push the Hook 8 in the direction of arrow A and lift up the Ass y P U Deck 9 in direction of arrow B Fig 5 8 PCB Deck Ass y and Ass y P U Deck Removal SLED SLED TM TM 1 SCREW DECK PCB 1 SCREW HOOK B A ASS Y P U DECK Assembly Point CN3 CN2 1 2 6 9 5 4 3 7 8 ...

Page 44: ... the direction arrow A 2 When the Tray Disc 4 comes out little pull it in the direction arrow B by hand 3 Pull the Tray Disc 4 to disassemble while simultaneously pushing 2 Stoppers 5 left right in the direction arrow C D Fig 5 9 Tray Disc Removal TRAY DISC B A SCREW DRIVER EMERGENCY HOLE C SLIDER HOUSING STOPPER STOPPER D 5 4 3 5 1 2 ...

Page 45: ... Disassembly and Reaasembly 5 4 3 Slider Housing Removal 1 Push the Slider Housing 1 in the direction arrow A 2 Lift up the Slider Housing 1 Fig 5 10 Slider Housing Removal A SLIDER HOUSING Assembly PUSH 1 ...

Page 46: ... in the direction arrow A and lift up Gear Tray 6 Gear Housing 7 4 Push the 4 Hooks 8 bottom side in the direction arrow B and lift up the Motor Load Ass y 9 5 Remove Clamper Ass y 10 Fig 5 11 Housing Ass y Removal BELT 1 SCREW 1 SCREW PULLEY GEAR HOOK A GEAR TRAY GEAR HOUSING MOTOR LOAD ASS Y CLAMPER ASS Y Bottom Side 4 HOOKS B B B B 9 8 7 6 5 1 3 4 2 10 ...

Page 47: ...5 12 Disassembly and Reaasembly 5 4 5 Sub Chassis Removal 1 Remove the 4 Screws 1 2 Lift up the Ass y Brkt Deck 2 Fig 5 12 Sub Chassis Removal 4 SCREWS ASSY BRAK DECK 1 2 ...

Page 48: ...emove 2 Screws 4 4 Remove Shaft Pick Up 5 and Pick Up Assy 6 5 Remove 1 Screw 7 6 Remove 2 Screws 8 7 Remove 3 Spring Spindle 9 and Motor Spindle Ass y 10 Fig 5 13 Ass y Brkt Deck Removal 2 SCREW WASHER GEAR FEED B 2 SCREWS 1 SCREW SHAFT PICK UP GEAR FEED A PICK UP ASS Y SPRING SPINDLE MOTOR SPINDLE 1 2 3 8 7 9 10 5 4 6 ...

Page 49: ...5 14 Disassembly and Reaasembly MEMO ...

Page 50: ...t Vs Ns Vp Np REGULATOR Common power Ex 120 220V 50 60Hz Fig 6 1 Linear Power Supply Waveform Description Vs t 0 Fig 6 2 Vs t 0 Fig 6 3 Vout t 0 Fig 6 4 Input Common power to transformer Vp The output Vs of transformer is determined by the ratio of 1st Np and 2nd Ns Vs Ns Np x Vp Vout is output DC by diode and condensor ...

Page 51: ...in design 2 Greater core size and condensor capacity are ne eded because the transformer works on a single power frequency 6 1 1 b S M P S Pulse width modulation method v Vreg Vout 0 t Change by common power Regulator loss Fig 6 5 Terms 1 1st Common power input to 1st winding 2 2nd Circuit followings output winding of transformer 3 f Frequency Switching frequency T Switching cycle 4 Duty Ton T x 1...

Page 52: ...ress noise High inverted power occurs at switch PIC1 off because of the 1st winding of transformer V LI xdi dt LI Leakage Induction A very high residual voltage exists on both terminals of PQR11 because dt is a very short 2 SNUBBER circuit protects PIC1 from damage through leakage voltage suppression by RC Charges the leakage voltage to PER11 PDS11 PCR11 PCD12 and discharges to PR15 and PR16 6 1 2...

Page 53: ... load of 5 8V terminal decreses or AC inout voltage increases and Vout increases over 5 8V Then PICS2 Vs potential up over 2 5V PICS2 Vc down PICS1 A K potential down PICS1 C E current up PQR12 base current up PQR11 base current down Vout down Maintain 5 8V PRD31 PRD32 Reduce 5 8V overshoot PRS32 PCS32 Prevent PICS2 oscillation for phase correction 6 1 2 d Feedback Control Circuit Fig 6 9 ...

Page 54: ...ER Power TR Control Circuit Converter Voltage Detection Circuit FLT Driving Circuit 3 3V Rectified Smoothing Circuit 5V Rectified Smoothing Circuit 8V Rectified Smoothing Circuit 8V Rectified Smoothing Circuit 3 3V Rectified VoltageCircuit 5V Rectified VoltageCircuit x2 Motor 8V 1 Port 8V Rectified VoltageCircuit 8V Rectified VoltageCircuit O U T P U T Fig 6 10 ...

Page 55: ... the flow of signal generated by the pick up A B C D signals detected from pick up are converted in to RF signal A B C D via RF summing AMP Fig 6 12 shows the waveform equalizing block diagram for the RF signal It outputs to EQout Pin 86 terminal by initially changing switching AMP gain of DVD and CD and then adjusting the level in RF SUM AGC It controls RF SUM AGC gain by means of Pin 89 95 and i...

Page 56: ... of DVD EQ and CD EQ are as follows 1 DVD CD EQ control parameter 1 EQG Pin 97 Changes the gain of peak frequency with EQ frequency characteristic Convert PWM signal output from KS1453 into DC via low pass filter 2 EQF Pin 98 Changes the peak frequency with EQ frequency characteristic Convert PWM signal output from KS1453 into DVD via low pass filter ...

Page 57: ...mmands of front panel or instructions of remote control through communication with Micom FIC1 LC86P6232 of front and controls the devices on board to execute the corresponding commands after initializing the devices connected with micom on board at power on 6 3 2 Block Diagram RIC1 RF AMP KS1461 SIC1 DIGITAL SERVO KS1452 ZIC1 A V DECODER ZIVA4 1 AIC1 D A CONVERTER AK4393 DIC1 DATA PROCESSOR KS1453...

Page 58: ...CS2 MIC2 22 EPROM CHIP SELECT CH2 DSPCS DIC1 2 DATA PROCESSOR CHIP SELECT CH3 DVD1CS ZIC1 208 A V DECODER CHIP SELECT CH4 SRVCS SIC1 10 DIGITAL SERVO CHIP SELECT CH5 WR MIC1 89 MICOM OUTPUT WRITE SIGNAL CH6 RD MIC1 88 MICOM OUTPUT READ SIGNAL CS2 DSPCS DVD1CS CSB RD WR Fig 6 14 CH1 CS2 MIC2 22 EPROM CHIP SELECT CH2 DSPCS DIC1 2 DATA PROCESSOR CHIP SELECT CH3 DVD1CS ZIC1 208 A V DECODER CHIP SELECT...

Page 59: ...CH2 DSPCS DIC1 2 DATA PROCESSOR CHIP SELECT CH3 DVD1CS ZIC1 208 A V DECODER CHIP SELECT CH4 SRVCS SIC1 10 DIGITAL SERVO CHIP SELECT CH5 WR MIC1 89 MICOM OUTPUT WRITE SIGNAL CH6 RD MIC1 88 MICOM OUTPUT READ SIGNAL CS2 DSPCS DVD1CS CSB RD WR Fig 6 16 Servo Access ...

Page 60: ...ect lens of Pick up and disc for surface vibration of disc 2 Tracking SERVO Make the object lens follow the disc track in use of tracking error signal created from Pick up 3 SLED Linked SERVO When the tracking actuator inclines outwardly as the object lens follows the track during play the SLED motor moves slightly and counteracts the incline 4 CLV SERVO DISC Motor Control SERVO Controls the disc ...

Page 61: ...IC1 FEI Pin39 of RIC1 ABCD 2 PLAY When focus loop closes the loop during focus servo on both pin 65 and pin 75 of SIC1 are controlled by VREF voltage approx 2 5V and pin 26 27 of SIC4 are approximately 4 5V 2 TRACKING SERVO 1 NORMAL PLAY MODE 1 For DVD Composite The signal output from PD A B C D of Pick up the tracking error signal pin36 of RIC1 uses the phase difference of A C and B D in RIC1 and...

Page 62: ...ERVO Normal play mode Move SLED motor slightly by means of PWM signal in SIC1 pin 73 as the tracking actuator moves along with track during play Control to move the entire Pick up as the tracking actuator moves Coarse serach mode In case of long distance search such as chapter serach SIC1 uses MIRR and TZC signal of SIC1 38 52 Then read ID and compute the existing track count after input of next t...

Page 63: ...tus is reported by interrupt to main micom which controls the servo to kick back the pick up to the previous track after memorizing the last data read from disc until now It takes some times to jump to the previous track and return to the original jump location again The memory will have an empty space because A V decoder reads out data of memory When the memory has an empty space where data can b...

Page 64: ...rm Description It measures the timing that data processed in DIC1 at DVD playback STROBE REQ DACK SDATA all 2 2 0 1 0 Fig 6 20 CH1 STROBE DIC1 69 CLOCK CH2 REQ DIC1 70 DATA REQUEST CH3 DACK DIC1 58 DATA ACKNOWLEDGE CH4 SDATA DIC1 60 67 DATA ...

Page 65: ...agram 6 6 2 NTSC Digital Encoder ZIVA 4 1 Buit in video encode ZIC1 inputted from pin159 with 27MHz generates HSYNC and VSYNC which are based on video signal ZIC1 is synchronous signals with decoded video signal and control the output timing of 8bit video signal of ITU R601 format The inputted 8bit data which decoded from video decoder block is demuxed with each 8bit of Y R Y B Y The separate sign...

Page 66: ... is high active if the pin is floating and connecte to power the output isgnal is never outputted CVBS Y C Y Cr Cb outputted from video encoder are inputted to VIC1 Pin 7 Pin2 Pin4 and VIC2 Pin7 Pin4 Pin2 respectively and outputted from VIC1 Pin15 Pin13 Pin10 and VIC2 Pin15 Pin13 Pin10 Pin9 Pin12 Pin14 of VIC1 VIC2 are feedback pin to SAG compensation DC characteristic compensation of siganl The s...

Page 67: ...io data and transmit them to Data 0 and Data 1 Front L R channel is outputted in mixed audio output L R output and analog audio output and surround L R center and subwoofer aren t outputted If DVD of 2 channels source disc is used it is outputted by the same way with CD and VCD If 5 1 channel source disc front L R channel is outputted in Data 1 Surround L R in Data 2 and Center Sub woofer in Data ...

Page 68: ... data isn t compressed so it is called CD DA LPCM data The 2 channels data is converted through audio decoder 2 channel data and Data 0 and Data 1 are outputted in digital audio interface Via IEC 958 output process they is transmitted to digital amplifier or AC 3 MPEG DTS amplifier built in the external digital input source with IEC 958 1937 transmission format AUDIO INPUT BUFFER AUDIO OUTPUT BUFF...

Page 69: ...Circuit Descriptions 6 20 MEMO ...

Page 70: ...om object lens at play key input No focus incoming and no disc occurs Yes No B A No focus incoming FE in SIC1 65 is within specified range DRIC4 1 2 output are normal Check open state from DRIC4 to pick up Check RIC1 and A B C D input Check DRIC4 Yes Yes No No A ...

Page 71: ... and connection Check MIC1 Yes No LED SLED SIC4 32 33 output are normal Check SIC4 Yes No NO LD ON RIC1 28 is 5V Current exceeds 0 1A LD out pick up replace Open check in related circuit Check MIC1 Yes Yes Yes No No Divide RQ1 emitter terminal voltage and 5V real voltage difference into 10ohm B ...

Page 72: ...s Yes Yes A See Fine Seek Check No Yes Check pick up No FINE SEEK Check FINE SEEK MIRR signal RIC1 57 is missing TZCO signal SIC1 52 is occurs Track incomming is delayed TE is within 2V and 3V Pick up transfer smooth Check RIC1 Peripheral curcuit Check SIC1 Peripheral curcuit Time out due to many jump counts Check SIC1 peripheral circuit SIC1 76 output is normal SIC4 28 29 terminal outputs are nor...

Page 73: ...ck DIC1 MIC1 Check DRIC1 soldering and power Check path to RIC1 and SIC1 Check RIC1 soldering and power RIC1 86 output are normal RIC1 88 output is normal Check RIC1 peripheral circuit and A B C D Yes Yes Yes Yes Yes Yes No No No No No No No Tray open close MIC1 84 85 is Open L L Close H H Check SIC4 35 36 output at open close Check signal line state from SIC4 35 36 to tray motor Micom MIC1 error ...

Page 74: ...heck ZIC1 121 output Check ZIC1 125 CD VCD 16 9344MHz DVD 18 432MHz Yes Yes No No AOP1 1 7 output is normal Check AOP1 peripheral circuit Yes No Base terminal level of AQ1 AQ3 are L Check FIC1 47 mute Yes No Digital output error Output in ZIC1 127 is normal Output in AIC3 6 8 10 is normal Check AVJ4 5 peripheral soldering shot Check ZIC1 peripheral circuit Check AIC3 Yes No No Yes ...

Page 75: ... feed back Yes Yes No Yes All power is measured correctly and front cable is properly connected All clocks 20MHz 33 8688MHz 27MHz of main PCB oscillate normally Check A V decoder signal process block Check all clock oscillating parts Yes Yes No CS2 RD WR signal occur Check short pin out of micom common bus 8 bit Check short or operating of micom Check soldering of micom and communication devices Y...

Page 76: ...ET operation REF 5V all 28V power is supplied 12MHz oscillation FY1 If the problem persists Check after replacing Jack PCB with another one Check other parts for abnormal front operation persists Check power status Check X TAL peripheral circuit Yes Yes No No Reset working in FIC1 12 Check reset peripheral circuit of FIC2 Yes No FIC1 soldering is OK Check FIC1 soldering Yes No Key of STOP PLAY OPE...

Page 77: ...IC1 MIC1 peripheral short Check 27MHz oscillating part Yes No No Signals are output from SIC1 42 44 Replace SIC1 Yes No Yes S Video output error VSW1 video select switch is up position VR121 of VSW1 is high state Move the select switch to up position Check the soldering of VSW1 Yes No No Pin 87 in FIC1 is high state Check the connection between pin 87 in FIC1 and VR121 Yes No Yes D ...

Page 78: ...soldering of ZIC1 Yes Yes No No Analog signals are inputted normally pin 7 in VIC1 Yes No Power is normal at pin 16 in VIC1 Yes No Pin 1 in VIC1 is in low stste Yes Check the connection netween pin 133 in ZIC1 and VIC1 Check the connection betwen VIC1 and emitter of PQS58 Check the connection between pin 10 in FIC1 and pin 1 in VIC1 Check the soldering of VIC1 No No Check the connection between VI...

Page 79: ...Troubleshooting 7 10 MEMO ...

Page 80: ...8 1 8 Exploded View 8 1 Cabinet Assembly 8 2 Deck Assembly Page 8 2 8 3 ...

Page 81: ...Exploded Views 8 2 8 1 Cabinet Assembly MAIN P C B JACK P C B 104 102 103 105 KEY P C B 108 108 109 101 106 ...

Page 82: ...8 3 Exploded Views 8 2 Deck Assembly 107 906 ...

Page 83: ...Exploded Views 8 4 MEMO ...

Page 84: ...ER 103 TJ14101 PANEL FRONT DV P303U 103 TJ14102 PANEL FRONT DV P305U 104 TJ14121 COVER TOP 105 TJ14141 DOOR ASSY 106 TJ14162 PANEL REAR 107 TJ14211 BELT 108 TJ14241 FOOT FRONT 109 TJ14251 HOLDER CORD ACCESSORIES 802 TS15541 REMOTE HAND SET 803 TE13361 CORD AV MIC2 TC11291 IEPROM P303U CN8 TE13381 CONNECTOR DCN1 TE13391 CONNECTOR PFD01 TE13401 FUSE 2 ELECTRICAL PARTS LIST ...

Page 85: ...9 2 Replacement Parts List MEMO ...

Page 86: ...DIC1 KS1453 DVD CD Processor RIC1 KS1461 RF Amp DPD MIC1 TMP95C265F Main Controller FIC1 LC86P6232 Front Controller ZIC1 ZiVA 4 1 A V Decoder CVBS R Pr B Pb G Y Lt Rt Post Filter Optical A V Decoder AC3 MPEG 5 1 Video Encoder 4DAC AUDIO DSP CSS INPUT FIFO DEMUX AIC1 AK4393 2 CH Audio DAC Down L R Compo Post Filter Y B Pb Post Filter C R Pr Post Filter Comp G Y IEC958 1937 VIC1 BA7660 6dB AMP VIC2 ...

Page 87: ...PCB Diagrams 1 11 1 Main COMPONENT SOLDER SIDE ...

Page 88: ...PCB Diagrams 2 11 2 Jack ...

Page 89: ...PCB Diagrams 3 11 3 Key 11 4 Deck ...

Page 90: ...12 1 12 Wiring Diagram ...

Page 91: ...Wiring Diagram 12 2 MEMO ...

Page 92: ... 13 9 13 10 13 11 13 12 13 13 13 1 Power 13 2 Main Micom 13 3 Servo 13 4 Video 13 5 Audio 13 6 RF 13 7 ZiVA 13 8 DSP 13 9 Front Micom VFD Display 13 10 Key 13 11 Deck 13 12 Remote Control Block Identification of PCB Main PCB Component Side Jack PCB Conductor Side ...

Page 93: ...Schematic Diagrams 13 2 13 1 Power ...

Page 94: ...Schematic Diagrams 13 3 13 2 Main Micom ...

Page 95: ...Schematic Diagrams 13 4 13 3 Servo ...

Page 96: ...Schematic Diagrams 13 5 13 4 Video ...

Page 97: ...Schematic Diagrams 13 6 13 5 Audio ...

Page 98: ...Schematic Diagrams 13 7 13 6 RF ...

Page 99: ...Schematic Diagrams 13 8 13 7 ZiVA ...

Page 100: ...Schematic Diagrams 13 9 13 8 DSP ...

Page 101: ...Schematic Diagrams 13 10 13 9 Front Micom VFD Display ...

Page 102: ...Schematic Diagrams 13 11 13 10 Key ...

Page 103: ...Schematic Diagrams 13 12 13 11 Deck ...

Page 104: ...Schematic Diagrams 13 13 13 12 Remote Control ...

Page 105: ...Schematic Diagrams 13 14 MEMO ...

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Hitachi DV-P303U, Service Manual

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