Mitsubishi HS-U778 Service Manual Download Page 1

Page: 1 / 84

SPECIFICATIONS

Tape Format

Power Source
Power Consumption
Video Signal System
Video Recording System

Luminance
Color Signal

Hi-Fi Audio

Recording System

Linear Audio Track
Tape Speed

Record/Playback Time

Heads: Video

Hi-Fi Audio
Audio/Control
Erase

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

: S-VHS/VHS 1/2” high-density

video cassette tape

: 120V AC ; 60 Hz
: Approx. 25 W
: EIA standard ; NTSC color
: S-VHS standard
: Frequency modulation recording
: Low frequency conversion

sub-carrier phase shift recording

: VHS standard

Azimuth helical scanning system

: 1 track
: 1-5/16 i.p.s (standard play)

7/16 i.p.s (extended play)

: 120min. with T-120 video

cassette (SP mode)
360min. with T-120 video
cassette (EP mode)

: 4 rotary heads
: 2 rotary heads
: 1 stationary head
: 1 full track head

: 0.5 to 2.0 V(p-p), 75

Ω

unbalanced RCA pin Jack

: 346 mV(rms), 47 k

Ω

unbalanced RCA pin Jack

: 1.0 V(p-p), 75

Ω

unbalanced

RCA pin Jack

: 346 mV(rms), 1 k

Ω

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

Deck

• Weight and dimensions shown are approximate.
• Design and specifications are subject to change without notice.

Only cassettes marked S-VHS or VHS can be used with this video cassette recorder.

MITSUBISHI

2002

VIDEO CASSETTE RECORDER

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Ave. Irvine, California 92618 U.S.A.

MODEL

HS-U778

Summary of Contents for HS-U778

Page 1: ...xtended play 120min with T 120 video cassette SP mode 360min with T 120 video cassette EP mode 4 rotary heads 2 rotary heads 1 stationary head 1 full track head 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...

Page 2: ...SY SLIP GEAR SLIP SPRING SLIP 2 WASHER THRUST WASHER SLIP ADJUSTER IDLER 2 UNIT 9 2 15 CAPSTAN BRAKE SPRING CAPSTAN BRAKE ASSY 11 2 16 FC HOLDER MOTOR HOLDER LOADING WORM LOADING MOTOR ASSY WORM WHEEL 12 2 17 PINCH ARM CAP PINCH ASSY 13 2 18 F L PLATE DOOR ARM 13 2 19 BRAKE CAM PLATE 14 2 20 GUIDE LAMP 15 2 21 MAIN CAM GUIDE ARM TU BRAKE LEVER LB PIN 16 2 22 L D LOCK LEVER 17 2 23 BRAKE BELT SP BE...

Page 3: ...Adjustment 34 3 3 1 Slant Adjustment of A C HEAD 34 3 3 2 Azimuth and Height Adjustment of A C HEAD 34 3 4 Phase Adjustment 35 3 5 Tape wrinkle check 35 4 Servicing for Tape Jam during the Loading Process 36 SERVICE CAN BE EXECUTED WITH THE EE PICTURE DISPLAYED 37 DECK OPERATION CHECK 37 FILE PARTSLST PARTS LIST 1 1 CABINET ASSEMBLY 1 2 PACKING PARTS 3 3 ELECTRICAL PARTS 5 FILE DECKASSY DECK ASSEM...

Page 4: ...p Select Y Luminance Signal Noise Reduction Audio Control Audio Play Back Audio Recording Audio Erase Audio Envelope Automatic Frequency Control Audio Flip Flop Auto Fine Tuning Voltage Automatic Level Control Audio Mode Amplifier Alternating Current Ground Automatic Phase Control Auto Fine Attenuator Blue Back Mute Carrier Noise Ratio Charge Coupled Device Character Generator Chip Slect Channel S...

Page 5: ...iliary speaker jacks switches grounding active or passive circuitry etc or use of unauthorized camera cables accessories etc may alter the safety characteristics of this VCR and potentially create a hazardous situation for the user Any design alterations or unauthorized additions will invalidate the manufacturer s warranty and will further relieve the manufacturer of responsibility for personal in...

Page 6: ...check and leakage current hot check performed PRECAUTIONS Handling and storage Avoid using the VCR in the following places extremely hot cold or humid places dusty places near appliances generating strong magnetic fields places subject to vibration poorly ventilated areas Be careful of moisture condensation If you pour a cold liquid into a glass water vapor in the air will condense on the surface ...

Page 7: ...N This terminal may also be labeled VHF IN If you have an older TV without this kind of terminal you will have to use a splitter and then connect the splitter to the television Now that you ve completed the antenna connections to your VCR you re ready to connect the VCR to the TV Because every television is different especially older model TVs your VCR may need to be connected in a variety of ways...

Page 8: ... remove the Top Cover in the direction shown by arrow 2 Removal of Front Panel 1 Remove the Top Cover Refer to Para 1 of the DISASSEMBLY 2 Unfasten the seven catches b shown in Fig 1 and remove the Front Panel in the direction shown by arrows DISASSEMBLY Top Cover a a Front Panel b b b Fig 1 ...

Page 9: ...f 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 2 b Bottom Panel Fig 3 ...

Page 10: ... shown in Fig 4 and raise the Shield Cover to remove it 5 Remove the four screws b shown in Fig 5 6 Disconnect the Connectors MA MD MH and ML 7 Release the two catches c shown in Fig 5 and raise the the DECK ASSY to remove it Note1 Remove the DECK ASSY paying attention to the Connectors MC and MF under it Note2 Short circuit the cathode side of D927 and the Shield Case using the jig shown below be...

Page 11: ...PCB OPE PCB SIGNAL PCB MAIN HOW TO EXECUTE CIRCUIT BOARD SERVICE Fig 6 a c b PCB OPE Fig 7 1 PCB OPE 1 Remove the Top Cover Refer to Para 1 of the DISASSEMBLY 2 Remove the Front Panel Refer to Para 2 of the DISASSEMBLY 3 Unfasten the one catch a shown in Fig 7 and rotate the PCB OPE in the direction shown by arrow b and remove it in the direction shown by arrow c 2 PCB SIGNAL 1 Remove the Top Cove...

Page 12: ...or the AC Power Cord from the Base Chassis shown in Fig 10 5 Release the two fastening catches b shown in Fig 9 Raise the PCB MAIN to remove it 6 Unfasten the fastening five screws C shown in Fig 11 and remove the Antenna Cover 7 Raise the PCB JACK upward to remove it as shown in Fig 11 a b b PCB MAIN Fig 9 Base chassis Holder for the AC Power Cord Fig 10 c Antenna Cover PCB JACK PCB MAIN Fig 11 ...

Page 13: ...ge the Chip Parts when soldering G Supplementary cementing is not required 1 Removal of Chip Parts Resistors capacitors etc A Grasp the part with tweezers Melt the solder at both sides alternately remove one side of the part with a twisting motion B Melt the solder at the other side and remove the part 2 Removal of Chip Parts Transistors A Melt the solder of one lead Lift the side of that lead upw...

Page 14: ...he HEADs may damage the tape if not dried completely MECHANICAL ADJUSTMENT AND REPLACEMENT 1 2 Tape Running System Clean the following Parts of the Tape Running System 1 TENSION PIN 2 F E HEAD 3 SLANT POLE SP 4 SLANT POLE TU 5 A C HEAD 6 GUIDE POLE TU 7 PINCH ROLLER 8 GUIDE PIN TU 9 GUIDE ROLLER SP 10 UPPER LOWER DRUM ASSY 11 GUIDE ROLLER TU 12 CAPSTAN SHAFT 13 IMPEDANCE UNIT SP 1 Clean the Tape R...

Page 15: ...e CLEANING ARM 2 Release the two catches b of the CLEANING ARM shown in the Fig 2 1 to remove the FELT RING Installation 1 Install the FELT RING shown in the Fig 2 1 to the CLEANING ARM 2 Install the CLEANING ARM shown in the Fig 2 1 2 2 STAY PLATE SET POSITION Normal Removal 1 Remove the two screws a fastening the STAY PLATE shown in the Fig 2 2 to remove the STAY PLATE Installation 1 Install the...

Page 16: ...the MAIN PLATE ASSY 2 Lift the BOTTOM ASSY in the Fig 2 3 1 in the direction shown by the arrow B and pull it out in the direction shown by the arrow C Installation 1 Apply GREASE MULTEMP AC DM 859D055O90 to the Grooves of the MAIN PLATE ASSY shown in the Fig 2 3 2 2 Apply GREASE MULTEMP AC DM 859D055O90 to the Bosses of the BOTTOM ASSY shown in the Fig 2 3 2 3 Rotate the WORM WHEEL shown in the F...

Page 17: ...SERT GUIDE TU shown in the Fig 2 4 to remove the INSERT GUIDE TU Installation 1 Install the INSERT GUIDE TU shown in the Fig 2 4 2 5 INSERT GUIDE SP SET POSITION Normal Remove the following parts before replacing the INSERT GUIDE SP Refer to the corresponding items to install them STAY PLATE Item 2 2 BOTTOM ASSY Item 2 3 Removal 1 Remove the screw a fastening the INSERT GUIDE SP shown in the Fig 2...

Page 18: ... Normal Remove the following parts before replacing the F L ARM ASSY F L BEARING Refer to the corresponding items to install them STAY PLATE Item 2 2 BOTTOM ASSY Item 2 3 INSERT GUIDE TU Item 2 4 INSERT GUIDE SP Item 2 5 REC HOLDER Item 2 5 Removal 1 Release the catch a of the F L BEARING shown in the Fig 2 7 and pull out the F L ARM ASSY in the direction shown by the arrow A Note Do not pull the ...

Page 19: ...l if necessary 2 Install the LEAD CONNECTOR of the A C HEAD UNIT shown in the Fig 2 8 3 Perform the Item 3 3 A C HEAD Adjustment and Item 3 4 Phase Adjustment of the Interchangeability Adjustment of the Mechanism 2 9 F E HEAD SET POSITION Normal Removal 1 Lift the F E HEAD shown in the Fig 2 9 1 in the direction by the arrow A to remove it Note Be sure to replace the removed F E HEAD with a new on...

Page 20: ...R COVER TU Installation 1 Install the SENSOR COVER TU shown in the Fig 2 10 2 11 SENSOR COVER SP SET POSITION Normal Removal 1 Remove the catch a of the SENSOR COVER SP shown in the Fig 2 11 to remove the SENSOR COVER SP Installation 1 Install the SENSOR COVER SP shown in the Fig 2 11 a SENSOR COVER TU Fig 2 10 a SENSOR COVER SP Fig 2 11 ...

Page 21: ...the REV UNIT TU shown in the Fig 2 12 3 Clean the dirt on the transparent part of the REV UNIT SP with a VIDEO HEAD cleaning cloth Note Never use solvent such as alcohol to clean the REV UNIT SP 4 Install the REV UNIT SP shown in the Fig 2 12 2 13 MODE POSITION UNIT SET POSITION Upside down Removal 1 Release the two catches a b of the MODE POSITION UNIT shown in the Fig 2 13 to remove the MODE POS...

Page 22: ... to replace the removed PULLEY BUSH with a new one 4 Remove the units from the THRUST WASHER to IDLER 2 UNIT shown in the Fig 2 14 1 Installation Note Be careful so that GREASE and OIL does not adhere on the Felt Side of the PULLEY GEAR ASSY or the Grooved Side of the SLIP GEAR shown in the Fig 2 14 4 1 Apply OIL FLOIL 948P 859D154O20 to the SHAFT for the IDLER 2 UNIT shown in the Fig 2 14 1 2 App...

Page 23: ...HRUST WASHER side Straight end Fig 2 14 5 9 Install the units from the SLIP 2 WASHER to REEL BELT shown in the Fig 2 14 1 Note1 Be sure to replace the removed PULLEY BUSH with a new one Note2 Attach the SLIP SPRING with its straight end facing the SLIP GEAR side Note3 Attach the SLIP 2 WASHER with its position set as shown in the Fig 2 14 5 Note4 Apply GREASE PG 641 859D055O30 to the part on the S...

Page 24: ...G shown in the Fig 2 15 2 Remove the catch a of the CAPSTAN BRAKE ASSY shown in the Fig 2 15 to remove the CAPSTAN BRAKE ASSY Installation 1 Install the CAPSTAN BRAKE ASSY shown in the Fig 2 15 2 Install the CAPSTAN BRAKE SPRING shown in the Fig 2 15 a CAPSTAN BRAKE ASSY CAPSTAN BRAKE SPRING CAPSTAN MOTOR Fig 2 15 ...

Page 25: ...R shown in the Fig 2 16 1 to remove the MOTOR HOLDER 3 Remove the two screws c fastening the LOADING MOTOR ASSY shown in the Fig 2 16 1 to remove the LOADING MOTOR ASSY and LOADING WORM 4 Remove the WORM WHEEL Installation 1 Apply GREASE MULTEMP AC DM 859D055O90 to the LOADING WORM shown in the Fig 2 16 2 2 Apply GREASE MULTEMP AC DM 859D055O90 to the WORM WHEEL shown in the Fig 2 16 2 3 Install t...

Page 26: ...CAM 2 Install the PINCH ARM CAP matching the Part B of the PINCH ARM CAP with the Rib of the MAIN PLATE ASSY 2 18 F L PLATE DOOR ARM SET POSITION Normal Remove the following parts before replacing the F L PLATE DOOR ARM Refer to the corresponding items to install them STAY PLATE Item 2 2 BOTTOM ASSY Item 2 3 SENSOR COVER TU Item 2 10 MOTOR HOLDER Item 2 16 PINCH ARM CAP Item 2 17 PINCH ASSY Item 2...

Page 27: ...er to the corresponding items to install them STAY PLATE Item 2 2 BOTTOM ASSY Item 2 3 MOTOR HOLDER Item 2 16 PINCH ARM CAP Item 2 17 PINCH ASSY Item 2 17 Removal 1 Rotate the MAIN CAM in the Fig 2 19 1 in the direction shown by the arrow A And move the BRAKE CAM PLATE so that the three catches a of the MAIN PLATE ASSY can be released 2 Remove the BRAKE CAM PLATE Installation 1 Apply GREASE MOLYKO...

Page 28: ... the arrow A counterclockwise when viewed from the bottom to match the longest slit c of the MAIN PLATE ASSY with the longest arm b of the GUIDE LAMP shown in the Fig 2 20 Pull it out downward to remove it Installation 1 Clean the dirt on the GUIDE LAMP with a VIDEO HEAD cleaning cloth Note Never use solvent such as alcohol to clean the GUIDE LAMP 2 Insert the GUIDE LAMP in the Fig 2 20 matching t...

Page 29: ...2 21 1 Installation 1 Apply GREASE MULTEMP AC DM 859D055O90 to the points on the new GUIDE ARM TU specified in the Fig 2 21 1 2 Apply GREASE MULTEMP AC DM 859D055O90 to the points on the MAIN PLATE ASSY specified in the Fig 2 21 1 3 Install the GUIDE ARM TU matching the Hole in the GUIDE ARM TU shown in the Fig 2 21 2 with the Hole in the MAIN PLATE ASSY Note Install the GUIDE ARM TU so that the P...

Page 30: ...M ASSY Item 2 3 Removal 1 Lift the BRAKE BELT SP shown in the Fig 2 23 to remove it from the REEL DISK SP side 2 Release the BRAKE BELT SP from the catch a of the BELT LEVER shown in the Fig 2 23 3 Release the two catches b of the BELT HOLDER shown in the Fig 2 23 and separate the BELT HOLDER from the BRAKE BELT SP 4 Release the catch c of the BELT HOLDER shown in the Fig 2 23 to remove the BRAKE ...

Page 31: ...lation 1 Install the BELT ADJUSTER shown in the Fig 2 24 2 Install the BELT LEVER shown in the Fig 2 24 2 25 TENSION ARM TENSION LEVER TENSION SPRING TENS AXIS HOLDER REEL DISK SP side SET POSITION Normal Remove the following parts before performing this Item Refer to the corresponding items to install them STAY PLATE Item 2 2 BOTTOM ASSY Item 2 3 MOTOR HOLDER Item 2 16 PINCH ARM CAP Item 2 17 PIN...

Page 32: ... 2 26 to remove it from the REEL DISK TU side 2 Release the two catches a of the BRAKE TU shown in the Fig 2 26 to remove the BRAKE BELT TU Installation 1 Install the BRAKE BELT TU shown in the Fig 2 26 to the BRAKE TU 2 Hook the BRAKE BELT TU shown in the Fig 2 26 to the REEL DISK TU side Note Install the BRAKE BELT TU so that its Felt Side touches the REEL DISK TU side 2 27 BRAKE TU REEL DISK TU...

Page 33: ...SY Item 2 3 MOTOR HOLDER Item 2 16 PINCH ARM CAP Item 2 17 PINCH ASSY Item 2 17 BRAKE CAM PLATE Item 2 19 BRAKE TU Item 2 27 REEL DISK TU side Item 2 27 Removal 1 Move the SHIFT SLIDER in the Fig 2 28 in the direction shown by the arrow A to release it from the SHIFT LEVER 2 Move the SHIFT LEVER in the Fig 2 28 in the direction shown by the arrow B to remove it Installation 1 Apply GREASE MULTEMP ...

Page 34: ... MAIN PLATE ASSY to remove the CHARGE ASSY Installation 1 Apply GREASE MULTEMP AC DM 859D055O90 to the parts on the MAIN PLATE ASSY specified in the Fig 2 29 2 Install the CHARGE ASSY 3 Install the SWING LEVER inserting the Part c of the SWING LEVER in the Fig 2 29 into the groove in the MAIN PLATE ASSY 4 Install the CHARGE SPRING to the SWING LEVER 2 30 LOADING ARM ASSY SP LOADING ARM ASSY TU SET...

Page 35: ...face each other as shown in the Fig 2 30 3 Note Be sure to replace the removed LOADING ARM ASSY SP with a new one 2 31 A L LEVER SET POSITION Upside down Remove the following parts before replacing the A L LEVER Refer to the corresponding items to install them STAY PLATE Item 2 2 BOTTOM ASSY Item 2 3 MOTOR HOLDER Item 2 16 PINCH ARM CAP Item 2 17 PINCH ASSY Item 2 17 BRAKE CAM PLATE Item 2 19 LOAD...

Page 36: ...he A L LEVER so that the Mark on the A L LEVER faces to the FLANGE of the LOADING ARM ASSY SP as shown in the Fig 2 31 3 Note The Part specified with Oblique Lines on the A L LEVER should be under the FLANGE of the LOADING ARM ASSY SP 4 Install the LOADING ARM ASSY TU so that the Marks on the LOADING ARM ASSY TU and on the A L LEVER will face each other as shown in the Fig 2 31 4 5 Install the LOA...

Page 37: ... 2 19 BRAKE BELT SP Item 2 23 BELT HOLDER Item 2 23 BELT LEVER Item 2 24 TENSION ARM Item 2 25 Removal 1 Loosen the TAPE GUIDE ASSY SP shown in the Fig 2 32 1 turn it fully in the Unloading direction to remove it 2 Loosen the TAPE GUIDE ASSY TU shown in the Fig 2 32 1 turn it fully in the Unloading direction to remove it Installation 1 Apply GREASE MULTEMP AC DM 859D055O90 to the parts on the MAIN...

Page 38: ...ion shown of the arrow B 2 Hook the Catch of the DRUM CLAMPER shown in the Fig 2 33 3 to the Reference Pin 3 Fasten the screw b while pushing the Part A in the direction shown by the arrow C clockwise when viewed from the top as shown in the Fig 2 33 3 Note Confirm at this time that the Catch of the DRUM CLAMPER touches the side of the Reference Pin 4 Fasten the screw a shown in the Fig 2 33 3 Not...

Page 39: ...f the DRUM ASSY shown in the Fig 2 34 1 2 Remove the two screws a fastening the DRUM MOTOR STATOR shown in the Fig 2 34 1 to remove the DRUM MOTOR STATOR 3 Remove the two screws b fastening the ROTOR CASE shown in the Fig 2 34 1 to remove the ROTOR CASE Note Mark on the END RING and UPPER DRUM ASSY shown in the Fig 2 34 1 using a pen etc for convenience in installing them 4 Loosen the hexagon scre...

Page 40: ...stall the BRUSH shown in the Fig 2 34 1 7 Install the BRUSH SPRING shown in the Fig 2 34 1 8 Install the DRUM MOTOR STATOR shown in the Fig 2 34 1 9 Connect the LEAD CONNECTOR of the DRUM ASSY shown in the Fig 2 34 1 10 Perform the Item PLAYBACK Switching Point adjustment 11 Perform the Item Interchangeability Adjustment of the Mechanism 12 Clean the DRUM ASSY with alcohol 2 35 CAPSTAN MOTOR SET P...

Page 41: ...N PLATE ASSY Fig 2 35 3 a A WORM WHEEL Arrow GUIDE ARM TU CAPSTAN MOTOR B Fig 2 35 2 Installation 1 Apply SILICON COMPOUND SC102 859D164O10 to the parts on the MAIN PLATE ASSY specified in the Fig 2 35 3 2 Install the CAPSTAN MOTOR ...

Page 42: ...MPEDANCE UNIT SP Installation 1 Install the IMPEDANCE UNIT SP shown in Fig 2 36 2 Install the FLYWHEEL SP shown in Fig 2 36 2 37 SSW HOLDER SSW SLIDER SET POSITION Upside down To access the SSW UNIT remove the following parts STAY PLATE Para 2 2 BOTTOM ASSY Para 2 3 Removal 1 Remove the SSW SLIDER shown in the Fig 2 37 2 Unfasten the two catches a shown in Fig 2 37 and remove the SSW HOLDER Instal...

Page 43: ...Y shown in the Fig 3 1 1 is 0 6 0 5mm 3 If A is not 0 6 0 5mm move the Hole in the BELT ADJUSTER in the Fig 3 1 2 within the range shown by the arrow A to set A at 0 6 0 5mm 4 Set the BACK TENSION measuring jig Code 859C345O80 and play back the tape 5 Confirm that A shown in the Fig 3 1 1 is 0 0 0 5mm 6 If A is not 0 0 0 5mm at step 5 repeat the adjustment from step 1 7 Confirm that the indicated ...

Page 44: ...f the GUIDE ROLLER SP so that the FM Waveform becomes flat such as in A Turn the screw counter clockwise if the position of the GUIDE ROLLER is lower than specified Turn the screw clockwise if the position of the GUIDE ROLLER is higher than specified 3 Perform the Item 3 2 4 Coarse Adjustment of Phase 3 2 3 Height Adjustment of GUIDE ROLLER TU 1 Loosen the height adjustment screw at the top of the...

Page 45: ...just the tracking manually according to the following procedure Turn the Shuttle Ring of the product during PLAYBACK for manual tracking adjustment Press the 3DSP button to switch the tracking adjustment from Manual to Auto 3 Adjust the tracking so that the amplitude level of the FM Waveform will be at the maximum Set the oscilloscope so that the amplitude level of the FM Waveform is 5 divisions o...

Page 46: ... 5 If the flatness is affected check the position of the A C HEAD If it is installed incorrectly correct it according to the Item 2 8 A C HEAD UNIT and repeat Item 3 2 4 Coarse Adjustment of Phase 3 2 7 Tape Running Condition at the GUIDE ROLLERs Check 2 1 Play back an alignment tape NM6KE2 859C339O90 2 Check that the FM Waveform is quickly restored to the previous level after lightly pressing and...

Page 47: ...Fig 3 3 1 to set the audio output level in the Fig 3 3 1 at the maximum After the adjustment remove the screw driver and confirm that the audio output level is 4 6 divisions or more when the maximum audio output level is set to 5 If the audio output level is less than 4 6 repeat steps 1 5 6 Push the A C HEAD to the right and left in the direction of A A in the Fig 3 3 1 and release it And confirm ...

Page 48: ... is below 4 8 divisions preset the tracking and repeat steps 3 10 12 Push the A C HEAD to the right and left in the direction of A A in the Fig 3 4 1 and release it Confirm that the amplitude of the FM Waveform does not change compared to before the A C HEAD was shifted 13 If the amplitude level of the FM Waveform changes check the set position of the A C HEAD If the A C HEAD is installed incorrec...

Page 49: ...g 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 WORM WHEEL A Fig 4 ...

Page 50: ...of D927 PCB MAIN Component side Fig 1 Check the DECK position and the operation of the Tape Running System according to the following procedure 1 Short circuit TP5T and TP5Y shown in the Fig 1 2 Initialize the E2 PROM 3 Check the operation of the Tape Running System by pressing the FF button REW button on the PCB MAIN FF button For forward rotation of the CAPSTAN MOTOR REW button For reverse rotat...

Page 51: ...lor Bars RF 1kHz audio SP NM6KE2 Part No 859C339O90 Monoscope 6kHz audio SP NC1KS Part No 859C339O80 Color Bars 1kHz audio SP NM3KE6 Part No 859C339O50 Monoscope 3kHz audio EP NMX Part No 859C568O60 Monoscope 3kHz audio SP A replacement E2PROM is not initialized before shipping so the E2PROM must be initialized when replaced Initialize the E2PROM by following the steps below 1 Press and hold the P...

Page 52: ...se or jitter in the playback picture TP5A TP5B VCR set up condition Using tape VCR condition Using Jig Input signal Alignment Tape NS1 stair step Playback 1 Play back an Alignment Tape NS1 stair step 2 Short circuit TP5A to TP5B 3 Push the CHANNEL UP DOWN buttons at the same time 4 Confirm that the values 55 75 are displayed on the fluorescent display after approx 6 seconds 5 Open circuit TP5A to ...

Page 53: ... 1 PARTS LIST 1 CABINET ASSEMBLY r w 1 2 1 8 3 6 7 t 0 9 3 ...

Page 54: ...12 46LA005 3 572D385O10 F L SPRING 4 752C673O70 CASSETTE DOOR ASSY 5 701B433O20 FRONT UNIT 6 752C664O40 DOOR PANEL ASSY 7 752C674O60 TIMER PANEL 8 246C324O10 AC POWER CORD 9 761B366O10 TERMINAL COVER 10 761C645O20 ANTENNA COVER 11 669D500O30 SCREW 3 10 12 669D229O90 SCREW M3 0 4 46LA005 13 669D501O30 SCREW 3 10 ...

Page 55: ... 3 1 2 2 4 4 9 8 6 5 4 3 2 7 A 1 B 3 2 PACKING PARTS ACCESSORY A B ...

Page 56: ...00X800 2 803A570O10 CUSHION 3 802B827O30 PACKING CASE 4 ACCESSORY BOARD 11 831D337O10 PACKING BAG FOR ACCESSORY A 12 872C246O70 INSTRUCTION BOOK 13 BATTERY 14 PACKING BAG FOR PARTS 15 939P724O10 IR BLASTER 16 243C273O10 CABLE RF 17 243C274O10 Y C CABLE S S 1 5m 18 243C247O10 CABLE 3P 19 939P755O10 REMOTE HAND UNIT ...

Page 57: ...DECK ASSEMBLY ...

Page 58: ...2 G 083 M 011 M 012 M 013 M 021 M 033 M 022 M 033 M 023 M 032 G 022 G 091 G 074 G 075 A 022 A 023 A 027 B 010 B 015 B 025 P 011 P 012 P 021 H 051 H 021 H 011 H 012 H 031 I 011 I 021 I 012 I 031 I 031 N 012 N 011 N 013 O 031 O 011 O 021 A 025 C 011 C 010 M 037 S 011 T 011 A 1 DECK ASSEMBLY DECK ASSEMBLY 1 A 021 A 024 G 089 G 072 G 072 A 019 A 026 1 2 3 4 5 6 7 8 A B C D E F G H I J K G 012 G 201 G ...

Page 59: ...KE CAM PLATE 1 G 082 594C229O10 K E 7 SHIFT LEVER 1 G 083 594C230O10 K C 5 SWING LEVER 1 G 084 597D866O10 K G 7 L D LOCK LEVER 1 G 089 622D829O10 K I 4 LB PIN 1 G 091 572D974O10 K D 2 TENSION SPRING 1 G 104 460D018O10 K C 4 F E HEAD 1 G 201 669D224O90 K A 1 C 2 SCREW 2 6 5 6 D 7 I 1 J 2 G 203 669D476O30 K E 7 SCREW 2 6 6 2 G 212 552C017O30 K C 5 E 8 THRUST WASHER 2 5 6 0 13 4 H 011 621C758O10 K J ...

Page 60: ...061 G 025 G 017 G 018 G 088 G 201 G 081 G 093 G 031 G 035 G 101 G 043 G 034 G 057 G 056 G 212 G 060 G 044 G 094 G 201 G 042 M 014 M 031 1 2 3 4 5 6 7 8 A B C D E F G H I M 034 G 214 G 215 A 2 DECK ASSEMBLY DECK ASSEMBLY 2 A 029 A 028 ...

Page 61: ...C186O10 K B 3 SHIFT SLIDER 1 G 060 640D948O10 K B 2 PULLEY BUSH 1 G 061 640D949O10 K B 4 SLIP GEAR 1 G 066 640C189O20 K B 5 SLIP ADJUSTER 1 G 081 594C228O10 K G 4 A L LEVER 1 G 088 594C304O10 K G 2 SPACER PLATE 1 G 093 572D976O10 K E 2 CAPSTAN BRAKE SPRING 1 G 094 572D977O10 K I 6 REC SPRING 1 G 096 573D073O10 K B 4 SLIP2 SPRING 1 G 101 521D102O10 K B 1 REEL BELT 1 G 201 669D224O90 K G 2 I 6 SCREW...

Page 62: ... S Q2011 260P818O30 CHIP TRANSISTOR 2SC2412K S Q2012 260P818O30 CHIP TRANSISTOR 2SC2412K S Q2013 261P066O10 CHIP TRANSISTOR 2SA1037AK Q351 261P056O10 TRANSISTOR 2SD734F Q352 260P629O60 TRANSISTOR 2SC3331 T Q353 260P629O60 TRANSISTOR 2SC3331 T Q354 261P065O30 CHIP TRANSISTOR DTA124EKA Q355 260P562O40 TRANSISTOR 2SA952 K Q356 261P067O30 CHIP TRANSISTOR DTC124EKA Q3A0 261P065O30 CHIP TRANSISTOR DTA12...

Page 63: ...D961 264P772O50 DIODE MTZJ3 0A D970 264P568O30 DIODE 1SS254 D971 264P568O30 DIODE 1SS254 D972 264P568O30 DIODE 1SS254 D973 264P568O30 DIODE 1SS254 FILTERS L901 351P172O10 LINE FILTER SS11V 10062 LC2000 409P402O30 EMI FILTER FZ103N100 COILS L02 325C472O20 PEAKING COIL 56µH J L03 325C472O50 PEAKING COIL 100µH J L04 325C472O50 PEAKING COIL 100µH J L100 325C473O70 PEAKING COIL 1000µH J L120 325C472O50...

Page 64: ...ISTOR 1 10W 560kΩ J R2000 103P404O10 CHIP RESISTOR 1 10W 22kΩ J R2001 103P403O80 CHIP RESISTOR 1 10W 12kΩ J R2002 103P472O50 CHIP RESISTOR 1 10W 1kΩ F R2003 103P471O50 CHIP RESISTOR 1 10W 390Ω F R2004 103P471O70 CHIP RESISTOR 1 10W 470Ω F R2005 103P473O30 CHIP RESISTOR 1 10W 2 2kΩ F R2006 103P402O30 CHIP RESISTOR 1 10W 680Ω J R2007 103P470O30 CHIP RESISTOR 1 10W 120Ω F R2008 103P473O50 CHIP RESIST...

Page 65: ...RESISTOR 1 10W 27kΩ J R5C4 103P403O70 CHIP RESISTOR 1 10W 10kΩ J R5C5 103P403O70 CHIP RESISTOR 1 10W 10kΩ J R5C6 103P401O70 CHIP RESISTOR 1 10W 220Ω J R5D4 103P405O30 CHIP RESISTOR 1 10W 220kΩ J R5D5 103P406O10 CHIP RESISTOR 1 10W 1MΩ J R5D6 103P405O70 CHIP RESISTOR 1 10W 470kΩ J R5D7 103P403O70 CHIP RESISTOR 1 10W 10kΩ J R5D9 103P403O40 CHIP RESISTOR 1 10W 5 6kΩ J R5E0 103P403O20 CHIP RESISTOR 1 ...

Page 66: ...400O80 CHIP METAL RESISTOR 1 10W 39Ω J R6111 103P400O80 CHIP METAL RESISTOR 1 10W 39Ω J R6112 103P401O30 CHIP RESISTOR 1 10W 100Ω J R6115 103P404O50 CHIP RESISTOR 1 10W 47kΩ J R6118 103P404O50 CHIP RESISTOR 1 10W 47kΩ J R6122 103P404O10 CHIP RESISTOR 1 10W 22kΩ J R6126 103P403O20 CHIP RESISTOR 1 10W 3 9kΩ J R6301 103P404O90 CHIP RESISTOR 1 10W 100kΩ J R6303 103P403O70 CHIP RESISTOR 1 10W 10kΩ J R6...

Page 67: ...CHIP CAPACITOR B25V 0 1µF K C2H7 141P137O60 CHIP CAPACITOR B50V 0 033µF K C2H9 154P331O50 CHIP CAPACITOR CH50V 15pF J C2J0 141P132O10 CHIP CAPACITOR B50V 0 01µF K C2J4 141P139O30 CHIP CAPACITOR B25V 0 1µF K C2J5 154P333O90 CHIP CAPACITOR CH50V 150pF J C2000 141P139O30 CHIP CAPACITOR B25V 0 1µF K C2001 141P132O10 CHIP CAPACITOR B50V 0 01µF K C2002 154P331O90 CHIP CAPACITOR CH50V 22pF J C2003 154P33...

Page 68: ...9O30 CHIP CAPACITOR B25V 0 1µF K C6A7 141P139O30 CHIP CAPACITOR B25V 0 1µF K C6A8 141P132O10 CHIP CAPACITOR B50V 0 01µF K C6A9 141P139O30 CHIP CAPACITOR B25V 0 1µF K C6B0 154P332O30 CHIP CAPACITOR CH50V 33pF J C6B1 181P219O80 ELECTROLYTIC CAPACITOR 50V 2 2µF M C6B2 181P219O20 ELECTROLYTIC CAPACITOR 04W 35V 4 7µF M C6B3 181P219O80 ELECTROLYTIC CAPACITOR 50V 2 2µF M C6B4 141P135O80 CHIP CAPACITOR F2...

Page 69: ...P166O10 KEY BOARD SWITCH RESET 1 1 L 4 75 S5S0 439P045O10 SWITCH S SW MPU10184MLBO S811 432P203O30 KEY BOARD SWITCH EJECT S812 432P203O30 KEY BOARD SWITCH POWER S813 432P203O30 KEY BOARD SWITCH SP EP S8A0 432P203O30 KEY BOARD SWITCH CH DOWN S8A1 432P203O30 KEY BOARD SWITCH STOP S8A2 432P203O30 KEY BOARD SWITCH CH UP S8A3 432P203O30 KEY BOARD SWITCH PLAY S8A4 432P203O30 KEY BOARD SWITCH FF S8A5 432...

Page 70: ... 2 Q6B0 CLAMP ATT MUTE 6dB AMP FBC MUTE 6dB AMP FBC MUTE 6dB AMP 23 21 26 Q6A4 Q6A3 Q6A5 25 Q122 FSC SYNC TIMING IC120 Character Generator VIDEO OUT SYNC SEP CONTROLLER SHIFT REGISTER 8 CHARACTER ROM CONTROL REGISTER INPUT OUTPUT CONTROL 17 3 5 OSC IN 10 19 VCO X2A0 3 58MHz Q2A6 71 73 J6006 V OUT1 Q6004 5 5 6 6 7 7 9 9 9 9 10 10 Rotary Trans Video Heads MH 89 88 86 94 93 91 2H R REC AMP SP EP 6H R...

Page 71: ...Q2B1 Q2B2 Q2B3 LPF CLAMP 44 43 IC6A1 Sub Emphasis Q6C6 10 8 NL PROCESS 7 2 Q6B0 IC6A0 Sub Luminance Sub Chroma 1 3 N S LPF CLAMP ATT CLAMP FBC CLAMP LPF NOISE CANCEL MUTE 6dB AMP 5 56 54 39 37 33 FBC MUTE 6dB AMP FBC MUTE 6dB AMP 21 23 26 PS COMB AD 2 12 16 Q2000 Q2001 IC2000 3DYCS DNR Q2013 Q2012 Q6A3 Q6A4 Q6A5 9 5 6 5 6 ST MT 6 6 SW MW PCB JACK J6003 S IN1 Y C Q6A6 9 87 93 AD NON RELATION DET 1H...

Page 72: ...o Bias 4 A OUT1 R A OUT1 L CONV AUDIO TU01 59 53 57 F A IN R F A IN L U77802043 T350 24 OUTPUT SELECT R ch INPUT SELECT NORMAL SELECT L ch PNR HOLD TIMING L ch PNR SW NOISE H L 4 LINEAR REC 2 61 62 9 11 L1 PB IC2A0 R IN L IN J6004 REAR J801 J801 B 3 J6006 3 1 DEM BLOCK 48 43 I2C DATA 42 From IC5A0 I2C CLK 1 SIF TU01 19 PC REC EQUALIZER REC AGC Audio Head Linear 27 VCA INPUT VCA 75µ S DE EMPH PB ON...

Page 73: ...901 2 D908 Q929 Q930 AC 120V Q901 Q903 HEATER HEATER CP MOTOR V MOTOR V PWV SW5 1 STBY5 SW12 SW5 1 STBY5 To TUNER TU01 15 V8A0 Display 45 1 7 M570 M572 28 56 63 67 66 FLDCS Sub CLK Sub SI IC5A1 Memory 8 6 5 9 14 VDD STRB CLK SIN SOUT IC8A0 STBY5 27 VEE P1 P12 30V D907 CTL CTL 2 1 6 7 Control Head MA DA 46 PC0 44 PC2 D5D0 15 26 PWV 59 I2C DATA 72 I2C CLK 71 To IC3A0 42 To TU01 10 To IC3A0 43 To TU0...

Page 74: ...r TAN or TANT Tantalum capacitor Electrolytic capacitor BP or NP Non polarized electrolytic capacitor I II Parts except for chips Not indicated Ceramic capacitor chip Electrolytic capacitor chip BP or NP Non polarized electrolytic capacitor chip Chips Characteristic Not indicated F or B high dielectric percentage CH SL etc Temperature compensating types 4 TP6A etc show Test Points 5 Capacitors 6 R...

Page 75: ...1 Q908 Q903 D961 C939 C907 L902 C921 R925 D911 C920 R923 C922 D910 C924 Q929 Q930 R974 D971 R973 Q928 R972 D970 R971 SW5 2 SW12 R970 D972 C916 C933 L907 L903 C929 D926 D973 R928 R919 D918 C927 C915 D917 Q907 R914 D907 C912 C945 D920 R909 R927 R905 IC901 C914 R911 R912 R926 D905 C913 C936 L906 D901 Q906 Q910 R918 Q905 D931 R917 R916 C926 R964 Q922 R963 Q918 R955 PWV CS12 NR6 G12 CP MOTOR V MOTOR V ...

Page 76: ...IC120 JP152 L3 R121 R122 C124 C123 PRT Q122 S INPUT R120 C120 C121 C126 C125 L120 THR MUTE R130 C127 C128 AFTV C132 MR JP154 TU01 R129 R128 RESET PB Y MU MV CHSW BB MW SYSTEM2 D120 FSC Q123 R127 CONVSW MP MQ Y TO YCA REMO SEND REMO RTN CONV AUDIO PB C L04 MT C04 Y FROM YCA R132 SIF CSYNC R131 R105 R108 Q153 L02 Q154 Q155 R106 R107 C102 Q102 TP9C C02 Q157 CBV CK C03 Q156 L03 TP12 NR6 C130 STBY5 BOX...

Page 77: ...C3C1 R3A4 Q3A2 C3F3 C3L0 R3L0 R3B3 R3B4 C3F1 C3D2 R3B9 R3C2 SAP R3B5 C3J7 R3C1 C3C9 R3Y0 JP3A3 L3A1 C3E3 C3E4 SW5 2 SW12 SIF C3F4 A IN L A IN R F A IN R F A IN L C3G1 C3G0 L3A0 TP3X R3A9 R3B0 R3C6 R3C5 C3B7 C3B5 R3F6 C3B4 C3B3 C3B2 C3A9 C3G3 AFF C3G2 L3A2 C3J3 C3J4 R3A0 TP3Y TP3N C3A5 C3A4 C3A3 C3A2 C3A0 C3A1 R3B2 R3C4 R3AM R3B1 R3C3 R3G0 TP3AM C3C8 C3J0 C3J1 C3J2 A L A R A C C3J6 R3A8 From 1 pin ...

Page 78: ...C2C1 R2A3 R2A4 R2A5 C2C2 I2C DATA LIN IN LIN OUT ETREC C2D6 C2F2 C2F1 C2E9 C2E8 DA JP2C3 R2B8 Q2A5 R2B7 TP2S C2F3 L2A6 L2A7 C2F5 C2F6 C2F8 C2F7 R2C7 R2D2 C2F9 C2G2 C2G1 C2G0 X2A0 R2C5 Q2A6 R2C4 R2C3 A R A C A L R302 R301 C301 C2H7 C2H8 HSEL VENV C2A0 CSYNC C2A1 C2A2 DFF CK C2A3 C2A4 C2A5 C2A6 C2A7 C310 C300 C317 L300 Q355 R351 R352 Q356 L2B1 C2B4 TP2H TP2G Y TO YCA C2C7 C2C8 L2A1 C2E7 R2B3 R2B0 R2...

Page 79: ...7 Vcc GND VCTL PG FG MOTOR GND MOTOR CURRENT OUT 5V 180 1 16W 180 1 16W 510 1 16W 0 47 1 2W 0 1µ 25V 0 1µ 25V 0 1µ 25V 510 1 16W 510 1 16W 0 1µ 25V 0 1µ 25V 0 1µ 25V B0 01µ 25V CORE 1 U 2 U 3 V 4 V 5 W 6 W 7 N C 8 MGND 9 MGND 10 MGND 16 N C 17 N C 18 RS F R 36 Vcc 35 RSm 19 Vco 20 VLIM 21 MGND 27 MGND 28 MGND 29 SGND 30 OSC 31 FGIN 32 AOUT 33 FGOUT 34 IC M63102BFP F R Vcc 5V SGND VCTL MGND Vco 12V...

Page 80: ...IVER DIMMING CIRCUIT 11 5 5 6 14 38 VDD 5V 7 43 VSS 0V 27 VEE 30V 28 31 26 SEG13 GRID10 SEG16 GRID7 SEG12 GRID11 15 25 SEG1 SEG11 37 32 GRID1 GRID6 IC8A0 µPD16312GB 3BS MS IC8A0 FLDCS C8A1 R8A5 C8A0 C8A2 R8A2 R8A3 D8A7 OS D8A1 S813 F C IN S8A1 D8A0 TP5X S8A7 D8A6 S8A6 S8A0 L8A0 D8A5 S8A5 D8A4 CS OFF S8A4 F A IN L R8A4 F A IN R D8A3 F Y IN S8A3 SUB CLK D8A2 S8A2 SUB DATA TP5Y SUB SI S812 STBY5 30V ...

Page 81: ...1 R6002 R6016 C6304 Q6305 Q6303 R6026 R6025 R6029 TP2J C6305 C6150 C6151 IC6005 Q6304 C6023 C6110 C6024 IC6301 CF6301 J6012 IC6002 R6040 C6030 C6031 R6039 C6028 C6029 R6086 R6087 L6009 C6032 C6034 C6033 C6035 C6157 C6152 R6017 Q6005 L6300 R6314 C6040 C6041 IC6004 C6036 C6037 C6038 C6039 Q6010 Q6009 C6072 Q6011 J6003 L6008 R6042 R6041 L6150 R6115 R6118 J6004 R6010 R6011 R6056 R6110 R6111 C6158 R602...

Page 82: ...9 C6E8 L6A5 R6F2 IC6A1 C6F1 R6F1 R6F4 R6F0 R6F3 R6E9 R6E8 C6F8 C6G0 C6F9 C6G1 R6E7 C6F7 R6E6 R6E2 R6E5 R6E4 R6E3 C6F6 C6F5 C6F3 C6F4 R6F5 R6F7 C6E7 R6J0 R6D7 IC6A0 D6A5 R6K1 R6J1 C6J2 IC6B0 R6H3 C6J1 R6H2 C6G5 C6J0 R6K0 R6H4 R6H5 C6J3 Q6D1 R6H6 Q6D2 Q6D3 R6H7 R6H0 R6H9 R6H8 R6K2 LOGIC CONT IC6A0 9 REC 1 7V p p H IC6A0 9 PLAY 1 5V p p H IC6A0 3 REC 0 35V p p H IC6A0 3 PLAY 0 23V p p H IC6A0 6 REC 1...

Page 83: ...07 Q2009 Q2010 Q2011 R2015 R2017 C2009 R2016 R2019 R2018 R2022 R2020 R2021 R2023 C2011 C2010 R2012 Q2012 R2024 R2025 R2026 C2041 C2014 C2013 L2004 L2005 C2015 C2016 R2027 R2028 C2012 Q2013 R2031 R2030 C2017 C2018 L2006 R2029 C2019 IC2000 C2021 C2022 C2023 C2024 C2025 R2036 C2028 R2037 R2038 R2039 R2040 R2041 L2002 C2035 C2036 R2034 R2035 C2026 R2043 R2045 R2047 R2051 R2054 R2055 R2049 R2057 C2030 ...

Page 84: ...5E4 D 3 R5E5 D 3 R5E6 D 3 R5E7 D 5 R5F7 D 4 R5F8 D 4 R5G1 E 5 R5G2 E 3 R5G3 E 5 R5G4 E 6 R5G5 E 3 R5G6 D 3 R5G7 D 3 R5G8 D 3 R5G9 D 2 R5H0 D 2 R5K6 E 5 R5L0 D 4 R5R2 D 4 R5R3 D 4 R5R4 E 5 R5R5 D 7 R5S0 E 3 R5S1 E 3 R5S3 E 3 R5S4 E 3 R5S6 E 3 R5S7 D 3 R5S8 D 3 R5S9 C 2 R5T3 A 2 R5T4 A 2 R5T5 A 3 R5T6 A 3 R5V2 E 2 R5W0 E 2 R5W1 D 2 R8A0 E 4 R8A1 E 4 R8A2 E 4 R8A3 E 4 R8A4 E 4 R8A5 E 4 R8A8 E 6 R8Y0 ...

Search results

Summary of Contents for HS-U778

Reviews:

Related manuals for HS-U778

Brands by name

Popular brands

Mitsubishi HS-U778, Service Manual

Search results

Summary of Contents for HS-U778

Reviews:

Related manuals for HS-U778

Brands by name

Popular brands