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No. 0508E DV-PF35U SERVICE MANUAL This service manual is for DV-PF35U USA model and DV-PF35U Canada model. For DV-PF35U Canada model, the letter (H9851CD) is printed on rating label in the rear. When servicing, refer to the rating label illustration at right.
CAUTIONS FOR SAFETY IN PERFORMING REPAIR 1-1 LASER BEAM SAFETY PRECAUTIONS This DVD player uses a pickup that emits a laser beam. Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin.
1-2 IMPORTANT SAFETY PRECAUTIONS 1-2-1 Product Safety Notice I. Also check areas surrounding repaired locations. J. Be careful that foreign objects (screws, solder Some electrical and mechanical parts have special droplets, etc.) do not remain inside the set. safety-related characteristics which are often not evi- K.
1-2-3 Safety Check after Servicing Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, Chassis or Secondary Conductor and wires have been returned to their original posi- tions. Afterwards, do the following tests and confirm the specified values to verify compliance with safety Primary Circuit Terminals standards.
1-3 STANDARD NOTES FOR SERVICING General Note: "CBA" is an abbreviation for 1-3-4 Instructions for Handling "Circuit Board Assembly." Semi-conductors Electrostatic breakdown of the semi-conductors may 1-3-1 Circuit Board Indications occur due to a potential difference caused by electro- static charge during unpacking or repair work. a.
GENERAL INFORMATION 2-1 SPECIFICATIONS PRODUCT TYPE [DVD section] DVD Player with Video Cassette recorder DISCS (PLAYBACK COMPATIBILITY) DVD Video, Audio CD, CD-RW/R CONNECTIONS DVD-RW/R Front panel: FREQUENCY RESPONSE Video input One RCA connector DVD (linear sound) : 20 Hz to 22 kHz (sample rate: 48 kHz) Audio input Two RCA connectors (one left 20 Hz to 44 kHz (sample rate: 96 kHz)
2-2 COMPARISON OF MODELS 2-2-1 General : Yes, ---: No, : Same as on left ITEM DV-PF35U DV-PF74U Dimensional 435(W) x 94(H) x 233(D)mm Weight 2.7 kg Tray Panel / FL Window Clear Color Front / Button Silver / Silver...
2-2-3 DVD Section : Yes, ---: No, : Same as on left ITEM DV-PF35U DV-PF74U Drive Speed Laser DVD/VCD/SVCD/CD-DA O / --- / --- / O CD-R/CD-RW/DVD-R (Video Format) O / O / O DVD-RAM/DVD-RW (Video Format) --- / O...
2-3 COMPARISON OF MAIN CONTROL ICS : Same as on left ITEM DV-PF35U DV-PF74U MICRO CONTROLLER MN35302 (IC101) MN35202 (IC101) FLASH ROM MBM29LV160BE90TN-KE1 / MBM29LV160BM90TN (IC103) ES29LV160DB-90TG / M29W160EB70N6E- PBF / MX29LV160BBTC-90G / M29W160EB70N6 (IC103) NC7SB3157P6X / SN74LVC1G3157DCKR (IC201) OP AMP...
2-4 LIST OF ABBREVIATIONS AND TERMS FOR DVD PLAYER Index Abbreviation/Term Explanation See Dolby AC3. CD-R One type of DVD standard disc, to which writing once is possible (recordable type) CD-RW One type of CD standard disc, to which writing up to 1000 times is possible Component video Used for outputs of HDTV video signal format.
2-5 FUNCTION INDICATOR SYMBOLS Note: The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR. On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons. Defective Cause Indication When reel and capstan mechanism is not...
DIGITAL AUTO TRACKING P R O G R E S S I V E S C A N GROUP P.SCAN REC TIMER LINE2 STOP PLAY DVD/VCR Combo DV-PF35U F.FWD STOP/EJECT PLAY REC/OTR CHANNEL OUTPUT VIDEO IN L (mono) AUDIO IN R...
LINE2 STOP PLAY F.FWD STOP/EJECT PLAY REC/OTR CHANNEL OUTPUT DVD/VCR Combo DV-PF35U VIDEO IN L (mono) AUDIO IN R • To select the VCR output mode • To activate the remote control in VCR mode • To select VCR position or...
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DVD ANALOG AUDIO OUT jacks DVD/VCR AUDIO OUT jacks AUDIO IN jacks Connect the supplied Audio Connect the supplied Audio Connect Audio cables coming ANT IN jack cables here through the Audio cable (red/white) here through from the audio out jacks of a Connect your antenna In jacks of a TV or other audio the audio In jacks of a TV or...
MAINTENANCE AND INSPECTION 3-1 TROUBLESHOOTING Troubleshooting is how to service for the specifying malfunction or poor parts. Detect malfunction or poor parts and service as the following charts. 3-1-1 Power Supply Section FLOW CHART NO.1 The power cannot be turned on. See FLOW CHART No.2 ...
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FLOW CHART NO.6 P-ON+9V is not outputted. (AL+5V is outputted normally.) Check D015, D031, C018, and their periphery, Is 12V voltage supplied to the collector of Q055? and service it if defective. Is the "L" pulse inputted to the base of Q052? Replace IC501.
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FLOW CHART NO.12 DVD-P-ON+3.3V is not outputted. (DVD-P-ON+12V is outputted normally.) Is the "H" pulse (approximately 5V) inputted into Check R1077 and their periphery, and service it if the base of Q1011? defective. Replace Q1011. FLOW CHART NO.13 DVD-P-ON+5V is not outputted. (DVD-P-ON+12V is outputted normally.) Is the "H"...
3-1-2 DVD Section FLOW CHART NO.1 The key operation is not functioning. Are the contact point and the installation state of Re-install the key switches (SW2001, SW2002, the key switches (SW2001-2003) normal? SW2003) correctly or replace the poor switch. When pressing each key switches (SW2001, Check the key switches (SW2001, SW2002, SW2002, SW2003), do the voltage of each pin SW2003) and their periphery, and service it if...
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FLOW CHART NO.5 The [No Disc] indication. Replace the DVD Main CBA. No improvement can be found. Original DVD Main CBA is poor. Replace the DVD Mechanism. FLOW CHART NO.6 Both picture and sound do not operate normally. Replace the DVD Main CBA. No improvement can be found.
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FLOW CHART NO.7 Picture does not appear normally. Set the disc on the disc tray, and playback. Replace the DVD Main CBA or the DVD Are the video signals outputted to each pin of Mechanism. CN1601 on the Main CBA? CN1601 8PIN S-Y(I/P)
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FLOW CHART NO.8 Audio is not outputted. Set the disc on the disc tray, and playback. Replace the DVD Main CBA or the DVD Mechanism. Are the analog audio signals outputted to each pin of CN1601 on Main CBA? CN1601 13PIN AUDIO-L CN1601 15PIN AUDIO-R Check each line between each pin of CN1601 Are the analog audio signals inputted to each pin...
3-1-3 VCR Section FLOW CHART NO.1 The key operation is not functioning. Are the contact point and the installation state of Re-install some key switches correctly or the key switches normal? replace some key switches. Check the key switches and their periphery, and Is the control voltage normally inputted into service it if defective.
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FLOW CHART NO.3 Cassette tape can not be loaded. When loading a cassette tape, on Pin(69) of Check the line between the start sensor and IC501, does the "L" pulse switch to the "H" pulse? Pin(69) of IC501, and service it if defective. When loading a cassette tape, is the specified Replace the Capstan Motor Unit.
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FLOW CHART NO.6 Capstan Motor does not rotate. Is 5V voltage supplied to Pin(2) of CN502? Check the P-ON+5V line and service it if detective. Is over approximately 2.6V voltage supplied to Check the line between Pin(5) of CN502 and Pin(5) of CN502? Pin(28) of IC501, and service it if detective.
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FLOW CHART NO.10 Video E-E does not appear. 1) In the external input mode Is the Video signal inputted to Pins(28,30,32) of Check the line between the video input IC301? terminal (rear) and Pin(28) of IC301, and service it if defective. Check the line between the video input terminal (front) and Pin(30) of IC301, and service it if defective.
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FLOW CHART NO.11 Hi-Fi E-E audio does not operate normally. Check the peripheral circuit of the front input terminal and service it if defective. Is each signal supplied to each pin of IC451 as below? L-ch R-ch Check the peripheral circuit of the rear input Front input terminal Pin(15) Pin(10)
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FLOW CHART NO.12 Hi-Fi audio can not be recorded normally. (E-E mode is normal.) Is the REC FM signal outputted to Pin(21) of IC451? Replace IC451. Is the line between Pin(8) of CN253 and Service the line between Pin(8) of CN253 and Pin(21) of IC451.
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FLOW CHART NO.15 Hi-Fi audio can not be playbacked normally in the linear audio mode. (E-E mode is normal.) Is the audio signal supplied to Pin(6) of IC301? Is the audio signal outputted to Pin(10) of IC301? Replace Check the line between Pin(10) of IC301 and Pin(62) of IC451, and IC301.
3-2 HOW TO INITIALIZE THE DVD PLAYER & VCR To put the program back at the factory-default, initialize the DVD player & VCR as the following procedure. < DVD Section > 1. Press [DVD], [1], [2], [3], [4], and [DISPLAY] but- tons on the remote control unit in that order.
3-3 FIRMWARE RENEWAL MODE 3-3-1 How to Update the Firmware Ver- The appearance shown in (*1) of Fig. 5 is described as follows: sion Note: Appearance State If the firmware has been changed, etc., we will use Reading... Sending files into the memory Service News, etc.
10.Press [CLEAR C.RESET] button on the remote control unit. Fig. 10 appears on the screen. " ******* " differ depending on the models. MODEL : ******* Version : *.** Region : * EEPROM CLEAR : OK EEPROM CLEAR : CLEAR EXIT: POWER Fig.
3-4 STANDARD MAINTENANCE 3-4-1 Service Schedule of Components This maintenance chart shows you the standard of replacement and cleaning time for each part. Because those may replace depending on environment and purpose for use, use the chart for reference. h: Hours : Cleaning I: Replace Deck...
3-4-2 Cleaning Cleaning of ACE Head Clean the head with a cotton swab. Cleaning of Video Head Procedure Clean the head with a head cleaning stick or chamois 1.Remove the top case. cloth. 2.Dip the cotton swab in 90% ethyl alcohol and clean Procedure the ACE head.
ADJUSTMENT 4-1 PREPARATION FOR SERVICING 4-1-1 How to Enter the Service Mode About Optical Sensors Caution: An optical sensor system is used for the Tape Start and End Sensors on this equipment. Carefully read and follow the instructions below. Otherwise the unit may operate erratically.
4-2 FIXTURE AND TAPE FOR ADJUSTMENT 1. Alignment Tape (MH-1) 2. Guide Roller Adj. Screwdriver No. 7099046 No. 7099028 3. Flat Screwdriver (Purchase Locally) 4-2-1 How To Use The Fixtures And Tape Item No. Name Part No. Adjustment I Head Switching Position Alignment Tape (MH-1) 7099046 I Tape Interchangeability Alignment...
4-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS NOTE: 1.Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to do these adjustments only after Figure 1 all repairs and replacements have been com- pleted. Also, do not attempt these adjustments EXT.
4-4 MECHANICAL ALIGNMENT PROCEDURES Explanation of alignment for the tape to correctly run B. Method to place the Cassette Holder in the starts on the next page. Refer to the information below tape-loaded position without a cassette tape on this page if a tape gets stuck, for example, in the 1.
4-4-2. Tape Interchangeability Alignment Note: To do these alignment procedures, make sure that the Tracking Control Circuit is set to the preset position every time a tape is loaded or unloaded. (Refer to page 4-7, procedure 1-C, step 2.) Equipment required: Dual Trace Oscilloscope VHS Alignment Tape (MH-1) Guide Roller Adj.
1-A. Preliminary/Final Checking and 3. Check to see that the tape runs without creasing at Alignment of Tape Path Take-up Guide Post [4] or without snaking between Guide Roller [3] and ACE Head. (Fig. M3 and M5) Purpose: 4. If creasing or snaking is apparent, adjust the Tilt To make sure that the tape path is well stabilized.
5. To shift the CTL waveform, press “CH K” or “CH L” 4. If the envelope is as shown in Fig. M8, adjust the button on the remote control unit. Then make sure height of Guide Roller [3] (Refer to Fig. M3) so that that the maximum output position of PB FM enve- the waveform looks like the one shown in Fig.
1-D. Azimuth Alignment of Audio/Con- 2. When the tape has been curled up or bent, turn trol/ Erase Head the alignment screw to adjust the height of REV Post. (Refer to Fig. M11 and M13.) Purpose: To correct the Azimuth alignment so that the Audio/ Control/Erase Head meets tape tracks properly.
DISASSEMBLY 5-1 CABINET DISASSEMBLY INSTRUCTIONS 5-1-1 Disassembly Flowchart REMOVAL This flowchart indicates the disassembly steps to gain REMOVE/*UNHOOK/ LOC. PART access to item(s) to be serviced. When reassembling, Fig. UNLOCK/RELEASE/ Note follow the steps in reverse order. Bend, route, and UNPLUG/DESOLDER dress the cables as they were originally.
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Reference Notes CAUTION 1: Locking Tabs (L-1) and (L-2) are fragile. Be careful not to break them. (S-1) [1] Top Case 1-1. Release three Locking Tabs (L-1). 1-2. Release three Locking Tabs (L-2), then remove the Front Assembly. CAUTION 2: Electrostatic breakdown of the laser diode in the optical system block may occur as a potential difference caused by electrostatic charge accumulated on cloth, human body etc, during...
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CN401 (S-3) (S-7) CN601 (S-7) (S-3) [4] DVD Mechanism Assembly (S-3) (S-7) (S-5) (S-4) (S-8) [6] Loader Holder (S-8) [8] VCR Chassis Unit [5] Partition Plate Fig. D3 Fig. D5 (S-6) (S-6) [7] DVD Main CN301 CN201 DVD Mechanism Short the three short lands by soldering. (Either of two places.) View for A Connector...
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Cylinder Assembly FE Head ACE Head Assembly SW512 Lead with blue stripe [9] Deck Assembly LD-SW Desolder (S-11) [12] Main CBA [9] Deck Assembly [11] Power SW CBA Cam Gear (S-9) [12] Main CBA Hole [10] DVD Shaft (S-10) Open/Close CBA Hole Desolder LD-SW...
5-1-3 How to Eject Manualy A. DVD 1. Remove the Top Case, Front Assembly and Top Bracket. 2. Remove four Screws (S-3) in Fig. D3. Do not disconnect connectors. 3. While lifting up the DVD Mechanism, rotate the roulette in the direction of the arrow as shown below. 4.
5-2 DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK MECHANISM Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to CABINET DISASSEMBLY INSTRUCTIONS on page 5-1.) All the following procedures, including those for adjustment and replacement of parts, should be done in Eject mode;...
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REMOVAL INSTALLATION STEP START- REMOVE/*UNHOOK/ /LOC. PART ADJUSTMENT Fig. No. UNLOCK/RELEASE/ CONDITION UNPLUG/DESOLDER [29] [25] Idler Gear DM1, DM14 [30] [29] Idler Arm DM1, DM14 *(L-11) [31] [25] BT Arm DM2, DM14 *(P-6) Loading Arm (SP) (+)Refer to Alignment [32] [25] DM2, DM14 Assembly...
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(S-1) (S-1) (L-1) (L-3) (L-2) (S-1A) (P-1) Installation of [3] and [6] First, insert [6] diagonally in [3] as shown below. Then, install [6] in [3] while pushing (L-1) in a direction of arrow. After installing [6] in [3], confirm that pin A of [3] enters hole A of [6] properly.
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(S-4) [46] [47] (L-14) Desolder from bottom (S-3) Lead with White Stripe View for A Belt Fig. DM7 (S-2) [11] (S-4A) (L-4) (P-3) [13] Removal of [11] [12] 1) Remove screw (S-4A). 2) Unhook spring (P-2). [10] Desolder Lead with Release (L-4) while (P-2) Red Stripe...
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Installation of [13] and [12] (S-5) [14] (S-6) [16] [13] [15] Hook spring (P-3) up to [12] and [13], then install then to (P-3) the specified position so that [12] will be floated slightly while holding [12] and [13]. (Refer to Fig. A.) [12] Fig.
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[22] (S-8) (C-2) (C-1) [23] (L-6) [21] (P-5) [20] Cap Belt (P-5) [28] Installation position of Cap Belt [21] Cap Belt When installing [23], install the spring (P-5) to [28] as shown in the left figure, and then install [23] while Pin on pressing the spring (P-5) to bottom...
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Installation of [25] [25] (C-4) Position of Mode Lever when installed Pin of [35] Pin of [31] Pin of [34] (S-9) (L-10) (L-8) (C-3) [27] [28] [24] Bottom View [26] [25] (L-9) [28] Align [25] and [28] as shown. First groove on [28] First tooth on [44] [28] When reassembling [28],...
5-3 ALIGNMENT PROCEDURES OF MECHANISM The following procedures describe how to align the Alignment 1 individual gears and levers that make up the tape load- Loading Arm (SP) and (TU) Assembly ing/unloading mechanism. Since information about the state of the mechanism is provided to the System Install Loading Arm (SP) and (TU) Assembly so Control Circuit only through the Mode Switch, it is that their triangle marks point to each other as...
6-2 REPLACEMENT PARTS LIST 6-2-1 Mechanical Parts List SYMBOL-NO P-NO DESCRIPTION SYMBOL-NO P-NO DESCRIPTION B355 TJ15103 SLIDER(SP) MK12 MECHANISM SECTION B359 TJ15103 CLEANER LEVER MK10 TJ18631 FRONT ASSEMBLY H9850UD B360 TJ14676 CLEANER ROLLER MK9 TJ18632 TOP CASE H9650UD B361 TJ15105 CL POST MK10 TJ17701 JACK BOARD(TUNER) H9600UD...
Note: Although some parts in the schematic diagrams have different names from those in 6-2-2 Electrical Parts List the parts list, there is no problem in replacing parts. SYMBOL-NO P-NO DESCRIPTION SYMBOL-NO P-NO DESCRIPTION D1037 TC10752 RECTIFIER DIODE 1N4005 CAPACITOR D1038 TC10752 RECTIFIER DIODE 1N4005...
APPENDIX 7-1 SYSTEM CONTROL TIMING CHARTS [ VCR Section ] Mode SW : LD-SW LD-SW Position detection A/D Input voltage Limit Symbol (Calculated voltage) 3.76V~4.50V (4.12V) 4.51V~5.00V (5.00V) 0.00V~0.25V (0.00V) 1.06V~1.50V (1.21V) 0.66V~1.05V (0.91V) 1.99V~2.60V (2.17V) 1.51V~1.98V (1.80V) 3.20V~3.75V (3.40V) 0.26V~0.65V (0.44V) 4.51V~5.00V...
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Still/Slow Control Frame Advance Timing Chart 1) SP Mode 18 RF-SW The first rise of RF-SW after a rise in F-AD signal F-AD (Internal Signal) "H" "H" "Z" C-DRIVE "L" "L" Stop detection (T2) Acceleration Detection (T1) Slow Tracking Value PB CTL Reversal Limit Value 20ms...
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2) LP/SLP Mode 18 RF-SW The first rise of RF-SW after a rise in F-AD signal F-AD (Internal Signal) "H" "H" "Z" C-DRIVE "L" "L" Stop detection (T2) Acceleration Detection (T1) Slow Tracking Value PB CTL Reversal Limit Value 20ms 27 C-F/R 79 H-A-SW 78 ROTA...
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1. EJECT (POWER OFF) -> CASSETTE IN (POWER ON) -> STOP(B) -> STOP(A) -> PLAY -> RS -> FS -> PLAY -> STILL -> PLAY -> STOP(A) PIN NO. LD-SW CL/SS 0.3S 0.3S LM-FWD "M" /REV 0.2S 0.2S 0.2S 0.2S 0.2S "Z"...
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[ DVD Section ] Tray Close ~ Play / Play ~ Tray Open Tray Disc Disc Tray Play Close Rotation Stop Open 3.3V Tray IN (TL221 on the DVD Main CBA) Sled Drive 1.65V (TP303 on the DVD Main CBA) Disc Drive 1.65V (TP301 on...
7-2 IC PIN FUNCTION DESCRIPTIONS [ VCR Section ] Signal Active Function Name Level IC501( SERVO / SYSTEM CONTROL IC ) 21 OUT LM-FWD/ Loading Motor H/Z/L FWD/ REV Output “H” ≥ 4.5V, “L” ≤ 1.0V Power On Signal to 22 OUT P-ON-L Signal Active...
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Signal Active Signal Active Function Function Name Level Name Level N.U. Not Used Tape Start Position IN ST-S Detector Signal OUTPUT- 46 OUT Output Select SELECT VCR Mode LED 70 OUT DVD-L-IND Signal Output Drum PG/FG Input IN D-PFG PULSE DVD Mode LED Signal 71 OUT DVD-H-IND...
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IC571 [ PT6313-S-TP ] Signal In/Out Name Function Name FP-CLK Clock Input FP-STB Serial Interface Strobe N.U. Not Used N.U. Not Used Power Supply Out a Out b Out c Out d Segment Output Out e Out h Pull Down Level Out i Segment Output Grid Output...
7-3 LEAD IDENTIFICATIONS 2SA1175(J,H,F) 2SK3757(Q) KIA4558P 2SA1015-GR(TPE2) 2SC2785(J,H,F,K) RC4580IP 2SK3543 2SC1815-BL(TPE2) BA1F4M-T UTC4558 2SC1815-Y(TPE2) BN1F4M-T KIA4558P/P 2SC2120-Y(TPE2) KRA103M KTC3198(Y,GR) KRC103M KTC3203(Y) KTA1266(GR) 2SC2001(K,L) KTA1267(GR,Y) KTC3193(Y) KTC3199(Y,GR,BL) G D S E C B E C B 2SC536NF-NPA-AT PT6313-S-TP EL817A MID-32A22F 2SC536NG-NPA-AT SC16313 EL817B PT204-6B-12...
SCHEMATIC, WIRING DIAGRAMS S-1 Schematic Diagrams / CBA’s and Test Points Standard Notes Notes: 1. Do not use the part number shown on these draw- WARNING ings for ordering. The correct part number is shown Many electrical and mechanical parts in this chassis in the parts list, and may be slightly different or have special characteristics.
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LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQES D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE.
S-2 Wiring Diagrams < VCR SECTION > FRONT REAR (DECK ASSEMBLY) VIDEO AUDIO(R) AUDIO(L) S-VIDEO AUDIO(R) AUDIO(L) VIDEO AUDIO(R) AUDIO(L) VIDEO AUDIO(R) AUDIO(L) DIGITAL VIDEO VIDEO VIDEO -OUT -OUT -OUT -OUT -OUT -Pr/Cr -Pb/Cb AUDIO OUT ACE HEAD ASSEMBLY CN504 ANT-IN AUDIO AE-H...
S-10 Main 7/8 Schematic Diagram CAUTION ! CAUTION ! NOTE: For continued protection against fire hazard, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using replace only with the same type fuse.
S-14 IC101 Voltage Chart ~ : Voltage is not consistent ----- : Not used Unit : Volts PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP PIN.NO PLAY STOP ----- -----...
CIRCUIT BOARD DIAGRAMS C-1 Main CBA, Sensor CBA, DVD Open/Close CBA, Power SW CBA Top View DVD Open/Close CAUTION ! Because a hot chassis ground is present in the power CAUTION ! supply circut, an isolation transformer must be used. For continued protection against fire hazard, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
C-2 Main CBA Bottom View CAUTION ! CAUTION ! Because a hot chassis ground is present in the power Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. For continued protection against fire hazard, supply circut, an isolation transformer must be used. If Main Fuse (F1001) is blown , check to see that all components in the power supply replace only with the same type fuse.