Mitsubishi hs-u778 Service Manual
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Mitsubishi hs-u778 Service Manual

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See also: Owner's Manual
MITSUBISHI
Tape Format
: S-VHS/VHS 1/2" high-density
Power Source
: 120V AC ; 60 Hz
Power Consumption
: Approx. 25 W
Video Signal System
: EIA standard ; NTSC color
Video Recording System
: S-VHS standard
Luminance
: Frequency modulation recording
Color Signal
: Low frequency conversion
Hi-Fi Audio
: VHS standard
Recording System
Linear Audio Track
: 1 track
Tape Speed
: 1-5/16 i.p.s (standard play)
Record/Playback Time
: 120min. with T-120 video
Heads: Video
: 4 rotary heads
Hi-Fi Audio
: 2 rotary heads
Audio/Control
: 1 stationary head
Erase
: 1 full track head
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Ave. Irvine, California 92618 U.S.A.
Copyright C 2002 Mitsubishi Digital Electronics America, Inc. All Rights Reserved.
Only cassettes marked S-VHS or VHS can be used with this video cassette recorder.

SPECIFICATIONS

video cassette tape
sub-carrier phase shift recording
Azimuth helical scanning system
7/16 i.p.s (extended play)
cassette (SP mode)
360min. with T-120 video
cassette (EP mode)
VIDEO CASSETTE RECORDER
Video Input
Audio Input
Video Output
Audio Output
Tuner
VHF
UHF
CATV
Operating Temperature
Relative Humidity
RF Channel Output
Weight
Dimensions
Timer Program Capacity
Deck
• Weight and dimensions shown are approximate.
• Design and specifications are subject to change without notice.
MODEL
HS-U778
: 0.5 to 2.0 V(p-p), 75Ω
unbalanced RCA pin Jack
: 346 mV(rms), 47 kΩ
unbalanced RCA pin Jack
: 1.0 V(p-p), 75 Ω unbalanced
RCA pin Jack
: 346 mV(rms), 1 kΩ unbalanced
RCA pin Jack
: 54~88 MHz, 174~216 MHz
: 470~806 MHz
: 54~88 MHz, 90~804 MHz
: 41 °F to 104 °F
: 30 % to 80 %
: Channel 3 or 4 switchable
: Approx. 8.4 lbs
: 16.7"(W) × 3.7"(H) × 11.8"(D)
: 1 month programmable
/ 8 programs
: α Deck
2002

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  • Page 1: Specifications

    • Weight and dimensions shown are approximate. • Design and specifications are subject to change without notice. MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC. 9351 Jeronimo Ave. Irvine, California 92618 U.S.A. Copyright C 2002 Mitsubishi Digital Electronics America, Inc. All Rights Reserved.

  • Page 2: Table Of Contents

    CONTENTS – FILE “COVERPGE” – SLIP SPRING, SLIP 2 WASHER, SPECIFICATIONS ............1 THRUST WASHER, SLIP ADJUSTER, CONTENTS..............2 IDLER 2 UNIT ..........9 GLOSSARY OF ABBREVIATIONS ........4 2-15 CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY ......11 – FILE “DISASSY” – 2-16 FC HOLDER, MOTOR HOLDER, SAFETY PRECAUTIONS ..........1 LOADING WORM, CONNECTION ..............3...

  • Page 3: Contents

    CONTENTS 3-2-1 GUIDE ROLLER Adjustment Check ....31 3-2-2 Height Adjustment of GUIDE ROLLER (SP) ........31 3-2-3 Height Adjustment of GUIDE ROLLER (TU) ........31 3-2-4 Coarse Adjustment of Phase .......32 3-2-5 Flatness Check of FM Waveform....32 3-2-6 Tape Running Condition at the GUIDE ROLLERs (Check1) ....33 3-2-7 Tape Running Condition at the GUIDE ROLLERs (Check 2) ....33 A/C HEAD Adjustment .........34...

  • Page 4: Glossary Of Abbreviations

    GLOSSARY OF ABBREVIATIONS : Audio/Control JSTCLK : Just Clock A-PB : Audio Play Back A-REC : Audio Recording LIN-IN : Linear Audio In : Audio Erase LIN-OUT : Linear Audio Out AENV : Audio Envelope LMUTE : Linear Mute : Automatic Frequency Control : Long Play : Audio Flip Flop AFTV...

  • Page 5: Safety Precautions

    SAFETY PRECAUTIONS INTRODUCTION SAFETY NOTICE This manual provides service information for the adjustments Before returning VCR to the customer a safety check of the of mechanical and electrical operations. entire VCR should be made. The service technician must be Due to design modifications, the servicing procedures and sure that no protective device built into the instrument by the data given in this manual are subject to possible change manufacturer has become defective or inadvertently...
  • Page 6 2. Hot Check The test sequence, with reference to the measuring (2) Close switch S1, energizing the VCR, and immediately circuit in the figure is as follows: after closing the switch, measure leakage current using (1) With switch S1 open, connect the VCR to the measuring both positions of switch S2, and with the switching circuit.

  • Page 7: Connection

    CONNECTION Connecting separate antennas (UHF/VHF) Now that you’ve completed the antenna connections to your Connecting the Television VCR, you’re ready to connect the VCR to the TV. To connect separate UHF/VHF antennas to the VCR: Because every television is different (especially older model 1.

  • Page 8: Disassembly

    DISASSEMBLY 1. Removal of Top Cover 1. Remove the two Top Cover fastening screws (a) shown Top Cover in Fig. 1 and remove the Top Cover in the direction shown by arrow. 2. Removal of Front Panel 1. Remove the Top Cover. (Refer to Para.
  • Page 9 3. Removal of Bottom Panel 1. Remove the two fastening screws (a) shown in Fig. 2. 2. Turn the set upside down as shown in Fig. 3. 3. Slide the Bottom Panel backward to remove it, taking care of the four catches (b). Fig.
  • Page 10 4. Removal of DECK ASSY 1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Remove the Front Panel. (Refer to Para. 2 of the DISASSEMBLY.) Shield Cover 3. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown below.

  • Page 11: How To Execute Circuit Board Service

    HOW TO EXECUTE CIRCUIT BOARD SERVICE CAUTION: BEFORE ATTEMPTING TO REMOVE OR PCB-JACK PCB-SIGNAL REPAIR ANY PCB, UNPLUG THE POWER PCB-MAIN CORD FROM THE A.C. SOURCE. LOCATION OF PRINTED CIRCUIT BOARDS Note : • Take caution when removing flat cables to prevent any contact problem.
  • Page 12 3. PCB-MAIN 1. Remove the Bottom Panel. (Refer to Para. 3 of the DISASSEMBLY.) 2. Remove the DECK ASSY. (Refer to Para. 4 of the DISASSEMBLY.) 3. Remove the three screws (a) shown in Fig. 9. 4. Remove the Holder for the AC Power Cord from the Base Chassis shown in Fig.

  • Page 13: Chip Parts Replacement

    CHIP PARTS REPLACEMENT CHIP PARTS REPLACEMENT 2. Removal of Chip Parts (Transistors) Some resistors, shorting jumpers (0Ω resistor), ceramic A. Melt the solder of one lead. Lift the side of that lead capacitors, transistors and diodes are chip parts. upward. When replacing these parts, note the following cautions.

  • Page 14: File "Coverpge" - Specifications

    MECHANICAL ADJUSTMENT AND REPLACEMENT 1. DECK Cleaning 1-2. Tape Running System Clean the following Parts of the Tape Running System. The following Parts require cleaning whenever serviced in 1. TENSION PIN order to maintain satisfactory performance. 2. F/E HEAD 1-1. VIDEO HEAD 3.

  • Page 15: Servo Circuit Adjustment

    2. Replacement of Major Parts 2-1. CLEANING ARM, FELT RING FELT RING SET POSITION : Normal (Removal) CLEANING 1. Release the two catches (a) of the CLEANING ARM shown in the Fig. 2-1 to remove the CLEANING ARM. 2. Release the two catches (b) of the CLEANING ARM shown in the Fig.

  • Page 16: Bottom Assy

    2-3. BOTTOM ASSY Hole in MAIN PLATE ASSY SET POSITION : Normal Remove the following part before replacing the BOTTOM ASSY. Refer to the corresponding item to install it. • STAY PLATE (Item 2-2) (Removal) 1. Move the WORM WHEEL in the Fig. 2-3-1 in the direction shown by the arrow A.

  • Page 17: Insert Guide (Tu)

    2-4. INSERT GUIDE (TU) SET POSITION : Normal Remove the following parts before replacing the INSERT INSERT GUIDE (TU) GUIDE (TU). Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) (Removal) 1.

  • Page 18: Rec Holder, Rec Lever, Rec Spring

    2-6. REC HOLDER, REC LEVER, REC SPRING SPRING REC LEVER SET POSITION : Upside down (Removal) 1. Remove the screw (a) fastening the REC HOLDER shown in the Fig. 2-6 to remove the REC HOLDER. 2. Release the REC SPRING shown in the Fig. 2-6 from REC HOLDER the catch (b) of the REC HOLDER to remove the REC LEVER.

  • Page 19: A/C Head Unit

    2-8. A/C HEAD UNIT LEAD CONNECTOR SET POSITION : Normal (Removal) 1. Remove the LEAD CONNECTOR of the A/C HEAD UNIT shown in the Fig. 2-8. A/C HEAD UNIT 2. Remove the two screws (a) fastening the A/C HEAD UNIT shown in the Fig. 2-8 to remove the A/C HEAD Head UNIT.

  • Page 20: Sensor Cover (Tu)

    2-10.SENSOR COVER (TU) SET POSITION : Normal (Removal) 1. Release the catch (a) of the SENSOR COVER (TU) shown in the Fig. 2-10 to remove the SENSOR COVER (TU). (Installation) 1. Install the SENSOR COVER (TU) shown in the Fig. 2- SENSOR COVER (TU) Fig.

  • Page 21: Rev Unit (Tu)

    2-12.REV UNIT (TU), REV UNIT (TU) REV UNIT (SP) SET POSITION : Upside down (Removal) REV UNIT (SP) 1. Release the two catches (a) of the REV UNIT (TU) shown in the Fig. 2-12 to remove the REV UNIT (TU). 2.

  • Page 22: Thrust Washer

    2-14.REEL BELT, PULLEY BUSH, THRUST REEL BELT WASHER, BELT PULLEY, SHIFT SLIDER, PULLEY GEAR ASSY, SLIP PULLEY BUSH GEAR, SLIP SPRING, SLIP 2 WASHER, THRUST WASHER, SLIP THRUST WASHER ADJUSTER, IDLER 2 UNIT BELT PULLEY SET POSITION : Upside down Pull in the direction (Removal) of the Arrow (A) to...
  • Page 23 9. Install the units from the SLIP 2 WASHER to REEL BELT shown in the Fig. 2-14-1. SLIP ADJUSTER Note1 : Be sure to replace the removed PULLEY BUSH Center of the with a new one. BELT PULLEY Note2 : Attach the SLIP SPRING with its straight end facing the SLIP GEAR side.

  • Page 24: Capstan Brake Spring

    2-15.CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY CAPSTAN BRAKE ASSY SET POSITION : Upside down (Removal) 1. Remove the CAPSTAN BRAKE SPRING shown in the CAPSTAN MOTOR Fig. 2-15. 2. Remove the catch (a) of the CAPSTAN BRAKE CAPSTAN BRAKE SPRING ASSY shown in the Fig.

  • Page 25: Fc Holder, Motor Holder

    2-16.FC HOLDER, MOTOR HOLDER, LOADING MOTOR ASSY LOADING WORM, LOADING MOTOR ASSY, WORM WHEEL SET POSITION : Normal (Removal) 1. Release the two catches (a) of the FC HOLDER LOADING FC HOLDER WORM shown in the Fig. 2-16-1 to remove the FC HOLDER. 2.

  • Page 26: Pinch Arm Cap, Pinch Assy

    2-17.PINCH ARM CAP, PINCH ASSY SET POSITION : Normal PINCH ARM (Removal) 1. Release the two catches (a) of the PINCH ARM CAP Part shown in the Fig. 2-17 to remove the PINCH ARM CAP. 2. Remove the PINCH ASSY shown in the Fig. 2-17. Part PINCH ASSY (Installation)

  • Page 27: Brake Cam Plate

    3. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the MAIN PLATE ASSY specified in the Hole Fig. 2-18-1. 4. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the DOOR ARM specified in the Fig. 2- MAIN CAM 18-1. 5. Install the DOOR ARM. F/L PLATE 6.

  • Page 28: Guide Lamp

    BRAKE SPRING Insert the BRAKE SPRING under the Catch. Catch BRAKE (TU) Fig. 2-19-3 2-20.GUIDE LAMP SET POSITION : Normal Remove the following parts before replacing the GUIDE LAMP. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) •...

  • Page 29: Main Cam, Guide Arm (Tu)

    2-21.MAIN CAM, GUIDE ARM (TU), MAIN CAM BRAKE LEVER, LB PIN SET POSITION : Normal Remove the following parts before replacing the MAIN CAM, GUIDE ARM (TU), BRAKE LEVER. Refer to the corresponding items to install them. BRAKE LEVER GREASE •...

  • Page 30: L/D Lock Lever

    2-22.L/D LOCK LEVER L/D LOCK LEVER SET POSITION : Normal Remove the following parts before replacing the L/D LOCK LEVER. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • MOTOR HOLDER (Item 2-16) •...

  • Page 31: Belt Lever, Belt Adjuster

    2-24. BELT LEVER, BELT ADJUSTER SET POSITION : Normal Remove the following parts before replacing the BELT BELT LEVER LEVER, BELT ADJUSTER. Refer to the corresponding items to install them. BELT ADJUSTER • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) •...

  • Page 32: Brake Belt (Tu)

    (Installation) 1. Apply OIL (FLOIL 948P) [859D154O20] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-25. 2. Install the REEL DISK (SP side). 3. Install the TENS AXIS HOLDER. Note : Install the TENS AXIS HOLDER so that the catch (a) for the TENSION ARM will be positioned on the front (F/L ARM ASSY side).

  • Page 33: Shift Lever

    (Installation) Note : Install the BRAKE BELT (TU) so that its Felt Side touches the REEL DISK (TU side). The GREASE applied to the BRAKE CAM PLATE and the MAIN PLATE ASSY should not adhere on the Felt Side of the BRAKE BELT (SP). 1.

  • Page 34: Charge Spring, Swing Lever

    2-29.CHARGE SPRING, SWING LEVER, CHARGE ASSY CHARGE SPRING SET POSITION : Normal Remove the following parts before replacing the CHARGE CHARGE ASSY SPRING, SWING LEVER, CHARGE ASSY. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) •...

  • Page 35: A/L Lever

    (Installation) 1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to LOADING ARM ASSY (TU) the parts on the MAIN PLATE ASSY specified in the Fig. 2-30-1. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the LOADING ARM ASSY (TU) specified in the Fig. 2-30-2. 3.
  • Page 36 (Installation) A/L LEVER Note : Install the LOADING ARM ASSY (TU) and LOADING ARM ASSY (SP), according to the following procedure, after installing the A/L Back LEVER. 1. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the parts on the MAIN PLATE ASSY specified in the Fig.

  • Page 37: Tape Guide Assy (Sp)

    2-32.TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU) TAPE GUIDE ASSY (TU) TAPE GUIDE ASSY (SP) SET POSITION : Normal Remove the following parts before replacing the TAPE GUIDE ASSY (SP), (TU). Refer to the corresponding items to install them. •...

  • Page 38: Drum Clamper, Drum Assy

    2-33.DRUM CLAMPER, DRUM ASSY LEAD CONNECTOR SET POSITION : Normal (Removal) 1. Disconnect the LEAD CONNECTOR of the DRUM ASSY shown in the Fig. 2-33-1. DRUM ASSY with 2. Remove the two screws (a, b) fastening the DRUM DRUM CLAMPER CLAMPER shown in the Fig.

  • Page 39: Spacer, Rotor Case, End Ring, Brush, Upper Drum Assy

    Part A Reference Reference Pin and Catch have to Catch touch each other. Fig. 2-33-3 2-34.DRUM MOTOR STATOR, BRUSH Side View of END RING SPRING, SPACER, ROTOR CASE, END RING, BRUSH, UPPER DRUM ASSY DRUM MOTOR This side down. STATOR SET POSITION : Normal (Removal) LEAD...

  • Page 40: Capstan Motor

    (Installation) 1. Install the SPACER shown in the Fig. 2-34-1. Note : Be sure to use the new SPACER packed with the new UPPER DRUM ASSY. 2. Install the UPPER DRUM ASSY shown in the Fig. 2- 34-1. 3. Install the END RING so that the reference hole (A) of the END RING shown in the Fig.
  • Page 41 (Installation) 1. Apply SILICON COMPOUND (SC102) [859D164O10] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-35-3. WORM WHEEL 2. Install the CAPSTAN MOTOR. GUIDE ARM (TU) Arrow CAPSTAN MOTOR Fig. 2-35-2 SILICON COMPOUND (SC102) MAIN PLATE ASSY Fig.

  • Page 42: Impedance Unit (Sp)

    2-36.IMPEDANCE UNIT (SP), FLYWHEEL (SP) SET POSITION : Normal FLYWHEEL (SP) (Removal) 1. Unfasten the two catches (a) on the IMPEDANCE UNIT (SP) shown in Fig. 2-36, and remove the IMPEDANCE UNIT FLYWHEEL (SP). (SP) 2. Remove the screw (b) on the IMPEDANCE UNIT (SP) shown in Fig.

  • Page 43: Interchangeability Adjustment Of The Mechanism

    3. Interchangeability Adjustment of the Mechanism Note 1 : Tracking may need to be preset during TENSION ARM interchangeability adjustment of the mechanism. Digital tracking is preset by short circuiting TP5A and TP5B on the PCB-MAIN. Note 2 : The adjustments are performed in the TENSION POLE PLAYBACK mode, using the staircase signal of an alignment tape,unless otherwise...

  • Page 44: Check And Adjustment Of Fm Envelope

    3-2. Check and Adjustment of the FM Envelope 3-2-1. GUIDE ROLLER Adjustment check 1. Play back an alignment tape (NM6KE2 : 859C339O90). 2. Preset the tracking. 3. Confirm that the FM Waveform is flat such as in (A). 4. Perform the Item 3-2-2. "Height Adjustment of GUIDE ROLLER (SP) "...

  • Page 45: Coarse Adjustment Of Phase

    3-2-4. Coarse Adjustment of Phase 1. Play back an alignment tape (NM6KE2 : 859C339O90). 2. Preset the tracking. 3. Observe the FM Waveform after performing Item 3-2- 1. "GUIDE ROLLER Check". Screw D 4. If the amplitude level of the FM Waveform is low as in (F) in Fig.

  • Page 46: Tape Running Condition At The Guide Rollers (Check1)

    3-2-6. Tape Running Condition at the GUIDE ROLLERs (Check 1) GUIDE ROLLER 1. Play back an Alignment Tape. Tape [NM6KE2: 859C339O90] 2. Confirm visually that there is a space between the Tape and the Lower FLANGE of the GUIDE ROLLER (SP) and the GUIDE ROLLER (TU).

  • Page 47: A/C Head Adjustment

    3-3. A/C HEAD Adjustment 3-3-1. Slant Adjustment of A/C HEAD 1. Play back a blank tape. Screw C 2. Slowly turn the slant adjustment Screw C shown in the Fig. 3-3-1 counter-clockwise to slightly crease the bottom of the tape at the Lower FLANGE of the GUIDE POLE (TU).

  • Page 48: Phase Adjustment

    3-4. Phase Adjustment 1. Play back an alignment tape (NM3KE6 : 859C339O50). 2. Preset the tracking. Screw D 3. Loosen the Screws D and E shown in the Fig. 3-4-1. Insert a screw driver (+) into the Hole in the MAIN PLATE ASSY (Part A) and move the A/C PLATE to the right and left to set the amplitude level of the FM Tape...

  • Page 49: Servicing For Tape Jam During The Loading Process

    4. Servicing for Tape Jam WORM WHEEL during the Loading Process 1. Remove the tape if the mechanism part is locked due tangled tape. 2. Rotate the WORM WHEEL of the LOADING MOTOR ASSY shown in the Fig. 4 in the direction of the arrow A to eject the cassette tape.

  • Page 50: Service Can Be Executed With The Ee Picture Displayed

    SERVICE CAN BE EXECUTED WITH THE EE PICTURE DISPLAYED 1. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown in Fig. 2. 2. Remove the DECK ASSY. 3. Connect TP5X and TP5Y with a jumper Note1: Short-circuit the test points before turning on the power.
  • Page 51 HOW TO INITIALIZE THE E PROM A replacement E PROM is not initialized before shipping, so the E PROM must be initialized when replaced. Initialize the E PROM by following the steps below. 1. Press and hold the POWER button on the set for 8 seconds. 2.
  • Page 52 [ Servo circuit ] Adjustment purpose Video switch over timing during playback. 1. Playback Switching Point Symptom when Switching noise or jitter in the playback picture. incorrectly adjusted 1. Play back an Alignment Tape. (NS1, stair step) Measuring instrument and condition VCR set up condition 2.

  • Page 53: Parts List

    PARTS LIST 1. CABINET ASSEMBLY - 1 -...
  • Page 54 : Critical Component ITEM PARTS NO. PARTS NAME DESCRIPTION 968C049O03 TOP COVER ASSY × 12 46LA005 669D221O40 SCREW 572D385O10 F/L SPRING 752C673O70 CASSETTE DOOR ASSY 701B433O20 FRONT UNIT 752C664O40 DOOR PANEL ASSY 752C674O60 TIMER PANEL 246C324O10 AC POWER CORD 761B366O10 TERMINAL COVER 761C645O20 ANTENNA COVER...

  • Page 55: Packing Parts

    2. PACKING PARTS ACCESSORY - 3 -...
  • Page 56 : Critical Component ITEM PARTS NO. PARTS NAME DESCRIPTION PACKING PARTS 831D190O30 PACKING SHEET 800X800 803A570O10 CUSHION 802B827O30 PACKING CASE – – – – – – – ACCESSORY BOARD ACCESSORY 831D337O10 PACKING BAG (FOR ACCESSORY A) 872C246O70 INSTRUCTION BOOK – – – – – – – BATTERY –...
  • Page 57 DECK ASSEMBLY...

  • Page 58: Deck Assembly-1

    G-022 DECK ASSEMBLY N-012 DECK ASSEMBLY-1 N-011 A-022 B-025 N-013 B-010 G-072 G-201 G-075 G-201 G-067 B-015 A-025 G-201 G-072 M-037 G-074 C-011 G-091 G-201 C-010 A-026 H-051 G-012 A-023 A-027 H-011 A-021 H-012 G-079 H-031 H-021 M-033 A-019 M-012 M-025 G-071 M-033...
  • Page 59 DECK ASSEMBLY-1 DECK ASSEMBLY-1 ∗ ∗ Settled Service Parts Settled Service Parts ∗ ∗ ITEM PARTS NO. ADDRESS PARTS NAME DESCRIPTION Qt. ITEM PARTS NO. ADDRESS PARTS NAME DESCRIPTION Qt. 2.6 × 5 669D224O90 K G-3 641B913O10 K B-7 A-019 SCREW I-011 ARM (SP)

  • Page 60: Deck Assembly-2 P/L

    DECK ASSEMBLY DECK ASSEMBLY-2 G-101 M-031 G-093 M-014 G-201 G-088 G-060 G-031 G-212 G-214 G-018 G-056 G-043 G-215 G-057 G-025 G-061 G-017 G-096 G-035 G-081 A-029 G-211 A-028 G-216 G-066 G-019 G-044 G-034 G-094 G-201 G-042 M-034...
  • Page 61 DECK ASSEMBLY-2 ∗ Settled Service Parts ∗ ITEM PARTS NO. ADDRESS PARTS NAME DESCRIPTION Qt. A-028 621C810O10 SSW HOLDER A-029 622D837O10 SSW SLIDER G-017 948D089O01 K H-4 LOADING ARM ASSY (SP) SUPPLY G-018 948D090O01 K G-3 LOADING ARM ASSY (TU) TAKE UP G-019 622D916O10 K B-5 IDLER2 UNIT G-025 948D098O03 K B-4...
  • Page 62 3. ELECTRICAL PARTS : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION Q2008 261P066O10 CHIP TRANSISTOR 2SA1037AK INTEGRATED CIRCUITS Q2009 260P818O30 CHIP TRANSISTOR 2SC2412K-S Q2010 260P818O30 CHIP TRANSISTOR 2SC2412K-S IC120 275P344O30 MOS IC M35053-051FP Q2011 260P818O30 CHIP TRANSISTOR 2SC2412K-S IC150 272P583O20 IC...
  • Page 63 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION Q922 260P562O40 TRANSISTOR 2SA952-K Q927 260P586O20 TRANSISTOR 2SB892-T D970 264P568O30 DIODE 1SS254 D971 264P568O30 DIODE 1SS254 Q928 260P559O40 TRANSISTOR 2SC1740S-R,S D972 264P568O30 DIODE 1SS254 Q929 261P036O10 TRANSISTOR 2SB1548 D973 264P568O30 DIODE...
  • Page 64 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION R2E5 103P404O80 CHIP RESISTOR 1/10W 82kΩ-J TRANSFORMERS R2E6 103P405O30 CHIP RESISTOR 1/10W 220kΩ-J R2F0 103P405O80 CHIP RESISTOR 1/10W 560kΩ-J T901 350P717O60 POWER TRANSFORMER R2000 103P404O10 CHIP RESISTOR 1/10W 22kΩ-J VARIABLE RESISTORS R2001 103P403O80 CHIP RESISTOR...
  • Page 65 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION R2061 103P409O50 CHIP RESISTOR 0.1W 0Ω (2125) R5C4 103P403O70 CHIP RESISTOR 1/10W 10kΩ-J R5C5 103P403O70 CHIP RESISTOR 1/10W 10kΩ-J R2062 103P409O50 CHIP RESISTOR 0.1W 0Ω (2125) R5C6 103P401O70 CHIP RESISTOR 1/10W 220Ω-J R2063 103P409O50 CHIP RESISTOR...
  • Page 66 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION R6E5 103P472O90 CHIP RESISTOR 1/10W 1.5kΩ-F R6112 103P401O30 CHIP RESISTOR 1/10W 100Ω-J R6E6 103P472O50 CHIP RESISTOR 1/10W 1kΩ-F R6E7 103P472O50 CHIP RESISTOR 1/10W 1kΩ-F R6115 103P404O50 CHIP RESISTOR 1/10W 47kΩ-J R6118 103P404O50 CHIP RESISTOR 1/10W 47kΩ-J...
  • Page 67 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION C126 141P132O10 CHIP CAPACITOR B50V 0.01µF-K C2H7 141P137O60 CHIP CAPACITOR B50V 0.033µF-K C127 141P132O10 CHIP CAPACITOR B50V 0.01µF-K C128 154P332O70 CHIP CAPACITOR CH50V 47pF-J C2H9 154P331O50 CHIP CAPACITOR CH50V 15pF-J C2J0 141P132O10 CHIP CAPACITOR...
  • Page 68 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION C358 141P131O70 CHIP CAPACITOR B50V 4700pF-K C6A6 141P139O30 CHIP CAPACITOR B25V 0.1µF-K C379 181P212O60 ELECTROLYTIC CAPACITOR 04W 16V 47µF-M C6A7 141P139O30 CHIP CAPACITOR B25V 0.1µF-K C3A7 141P139O30 CHIP CAPACITOR B25V 0.1µF-K C6A8 141P132O10 CHIP CAPACITOR...
  • Page 69 : Critical Components SYMBOL PARTS SYMBOL PARTS PARTS NAME DESCRIPTION PARTS NAME DESCRIPTION C6034 181P219O90 ELECTROLYTIC CAPACITOR 04W 50V 3.3µF-M CF6301 299P116O10 CERAMIC RESONATOR KBR-4.0KES C6035 181P219O90 ELECTROLYTIC CAPACITOR 04W 50V 3.3µF-M F901 283D130O30 FUSE S1.6A 125V C6036 141P132O10 CHIP CAPACITOR B50V 0.01µF-K J6003 449C100O10 DIN SOCKET(4P) C6037 141P132O10 CHIP CAPACITOR...
  • Page 70 Luminance Record, Chroma Record HS-U778 IC6A1 IC2000 Sub Emphasis Q2013 CLAMP NTSC 3L LOGI.COMB 3DYCS/DNR Q6A4 Q2004 Q2006 NL PROCESS 6dB AMP MUTE N/S-LPF PAL 3L LOGI.COMB Q6A3 6dB AMP MUTE FILTER COMB 1H DLY Q2012 IC6A0 Q6B0 Q6C6 Sub Luminance...
  • Page 71 Luminance Playback, Chroma Playback HS-U778 IC6A1 IC2000 IC6A0 Q2013 NTSC 3L LOGI.COMB Sub Emphasis 3DYCS/DNR Sub Luminance/ Q2004 Q2006 Sub Chroma CLAMP NL PROCESS PAL 3L LOGI.COMB Q6A3 NOISE CLAMP MUTE 6dB AMP FILTER COMB 1H DLY CANCEL Q2012 Q6A4...
  • Page 72 Hi-Fi , Linear Sound and MCS Decoder HS-U778 IC3A0 Modulator/Demod. CONV-AUDIO (TU01 J6006 I2C-DATA From IC5A0 R-ch A-OUT1-R I2C-CLK R-OUT R-CHANNEL A-L 5 (REAR) OUTPUT SELECT L-CHANNEL L-ch L-OUT L-ch PB LPF FM LIM A-OUT1-L NOISE PCB-OPE HOLD R-IN L-IN...
  • Page 73 HEATER Power,Timer,Mechanical Control V8A0 HEATER Display HS-U778 D911 T901 18 PCB-MAIN D901 To TUNER TU01 15 D913 D912 D910 CP-MOTOR-V AC 120V Q908 D914 MOTOR-V D909 Q906 SW12 STBY5 Q910 D5D0 Regulator Q5B1 D927 Q5A3 Q905 Q901,Q903 D926 D908 Q5A5...
  • Page 74 C O M P O N E N T S R E A D C A R E F U L LY T H E PCB-MAIN PRODUCT SAFETY NOTICE IN THE SERVICE (Y/C/A) MANUAL. DON'T DEGRADE THE SAFETY OF THE PCB-MAIN RECEIVERS THROUGH IMPROPER SERVICING. (CONTROL) REMOTE HAND UNIT PCB-MAIN (TIMER/OPE) PCB-OPE PCB-JACK PCB-SIGNAL (SIGNAL) PCB-SIGNAL (YCS) PRINTED CIRCUIT BOARD PARTS LAYOUT HS-U778...
  • Page 75 STBY5 R917 330V(p-p) C915 D970 D917 (TIME/DIV 5µs) Q928 R914 Q907 Q905 R972 L902 D907 R916 SW5-1 C912 C921 D920 L904 R926 C937 R909 D972 R912 R927 R913 R970 D973 R905 C914 STBY5 IC901 R911 L906 D905 C913 C936 HS-U778...
  • Page 76 OSCILLATOR DATA ADDRESS TIMING DISPLAY CONTROLLER CONTROLLER POSITION GENERATOR DETECTOR TIMING GENERATOR TESTA DISPLAY READ CONTROL ADDRESS TESTB REGISTER CONTROLLER NTSC CVIDEO M-PAL LECHA VIDEO DISPLAY DISPLAY RAM CONTROLLER OUTPUT CVIN SHIFT DISPLAY CHARACTER ROM REGISTER PORT OUTPUT BLINKING HS-U778...
  • Page 77 R3A4 R3A2 Q3A2 R3L0 C3F1 C3J2 C3J7 R3B4 Q3L0 C3C8 R3B3 C3L0 C3F2 C3A5 C3F3 C3A4 IC3A0 F-A-IN-R R3B0 C3A3 R3A9 C3A2 C3F8 F-A-IN-L C3A7 C3A0 C3A1 C3F6 R3C5 R3C6 CONV-AUDIO R3B2 R3B1 A-OUT-R R3C3 A-OUT-L R3C4 A-IN-R A-IN-L HS-U778...
  • Page 78 C379 C2C3 C2C2 R2A4 C2D5 R2F1 T350 C350 R2A5 R368 Q2A0 Q352 R357 C359 C2C7 C2C8 Q354 L2A1 JP2A2 Q2D0 Q2A2 Q2A3 R358 R2B0 R2B2 Q353 R2B3 IC2A0 !8 PLAY IC2A0 !9 REC IC2A0 !9 PLAY 0.44V(p-p)(H) 0.54V(p-p)(H) 0.44V(p-p)(H) HS-U778...
  • Page 79 16 N.C. VLIM 21 V LIMIT MOTOR GND INDEX + 17 N.C. Vco 20 Vco (12V) 1000p 1/16W 1/16W 1/16W ENTER 18 RS RSm 19 MUTE MENU 12k 0.063W 0.47 0.5W VCR/TV QUICK PROGRAM PLAY ADJ – INPUT X2 SP/EP HS-U778...
  • Page 80 DRIVER SEG16/GRID7 KEY DATA MEMORY (4 X 6) GRID1 11 Bit KEY 1 GRID SHIFT DRIVER REGISTER KEY 4 GRID6 4 Bit LATCH SW 1 4 Bit LATCH SW 4 14,38 7,43 LED 1 LED 4 (+5V) (0V) (-30V) HS-U778...
  • Page 81 Q6006 Q6007 R6304 C6152 Q6301 C6031 R6305 C6030 C6151 L6009 C6040 C6041 R6115 Not Employed R6118 IC6003 IC6004 R6022 R6023 IC6001 IC6002 C6038 C6039 C6036 C6037 R6314 C6032 C6033 C6034 C6035 D6002 Q6005 C6301 C6162 R6301 L6300 IC6301 CF6301 HS-U778...
  • Page 82 Q6A2 R6A1 R6A6 R6G7 Q6A1 C6A5 C6A7 R6K1 R6K2 D6A5 R6J0 IC6B0 R6H8 R6H6 Q6D3 C6J0 TP2S Q6D2 Q6D1 R6G2 C6J3 R6H4 R6H7 C6J2 R6G3 R6H2 R6H0 R6H5 R6H9 C6J1 R6H3 IC6A0 e REC IC6A0 e PLAY 0.42V(p-p)(H) 0.34V(p-p)(H) HS-U778...
  • Page 83 C2004 C2002 R2003 C2001 IC2000 JCP8013 NTSC 3L LOGI.COMB PAL 3L LOGI.COMB VY IN FILTER COMB 1H DLY Y COMB 1H DLY NON RELATION DET 1H DLY V OUT C IN PS COMB YC TIM.ADJ C OUT FSC IN HS-U778...
  • Page 84 C–1 D908 C–1 JP911 B–1 Q122 E–7 Q927 E–1 R2D4 B–5 R3D2 C–2 R5R3 D–4 R970 D–5 TP5LM B–2 C6158 B – 2 J6003 A – 3 Q6009 B – 4 R6022 A – 4 R6305 B – 1 HS-U778...

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