Mitsubishi HS-U778- Manuals

- 2 - 2. Hot Check The test sequence, with reference to the measuringcircuit in the figure is as follows: (1) With switch S1 open, connect the VCR to the measuring circuit. Immediately after connection, measure theleakage current using both positions of switch S2 andwith the switching devices in the...

- 3 - Connecting separate antennas (UHF/VHF)Connecting the Television To connect separate UHF/VHF antennas to the VCR: 1. Disconnect the antennas from the back of your TV.2. Connect the antenna leads to the combiner.3. Screw or push the combiner onto the ANTENNA terminal on the VCR labeled ANTENNA I...

- 4 - 1. Removal of Top Cover 1. Remove the two Top Cover fastening screws ( a ) shown in Fig. 1 and remove the Top Cover in the directionshown 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 ...

- 5 - a 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. 2 b Bottom Panel Fig. 3

- 6 - 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.) 3. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown below. Note: The CAPSTAN MOTOR may be damaged wit...

- 7 - CAUTION: BEFORE ATTEMPTING TO REMOVE ORREPAIR ANY PCB, UNPLUG THE POWERCORD FROM THE A.C. SOURCE. LOCATION OF PRINTED CIRCUITBOARDS Note : • Take caution when removing flat cables to prevent any contact problem. • Connect and disconnect the flat cables at right angles to the connector and make...

- 9 - Soldering Pencil Tweezers Solder Chip Pattern CHIP PARTS REPLACEMENT Some resistors, shorting jumpers (0 Ω resistor), ceramic capacitors, transistors and diodes are chip parts. When replacing these parts, note the following cautions. Cautions : A. Use fine tipped, well insulated soldering penc...

- 1 - Lightly apply the clothon the UPPER DRUMASSY. Do not move the cloth. Video HeadCleaningCloth !1 !2 w u y !0 e r q t i o !3 Fig. 1-1 1. DECK Cleaning The following Parts require cleaning whenever serviced in order to maintain satisfactory performance. 1-1. VIDEO HEAD 1. Clean the VIDEO HEAD acc...

- 2 - a a b b FELT RING CLEANING ARM Fig. 2-1 a a STAY PLATE Fig. 2-2 2. Replacement of Major Parts 2-1. CLEANING ARM, FELT RING SET POSITION : Normal (Removal) 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 ...

- 5 - c d a b A MAIN PLATEASSY F/L ARM ASSY F/LBEARING GREASE(MULTEMP AC-DM) ARM (SP) ARM (TU) GREASE (MULTEMP AC-DM) a c b REC LEVER RECSPRING REC HOLDER Fig. 2-6 Fig. 2-7 2-6. REC HOLDER, REC LEVER, REC SPRING SET POSITION : Upside down (Removal) 1. Remove the screw ( a ) fastening the REC HOLDER ...

- 9 - a A REEL BELT PULLEY BUSH THRUST WASHER BELT PULLEY Pull in the directionof the Arrow (A) toremove it from theSHIFT LEVER. SHIFT SLIDER PULLEY GEAR ASSY SLIP GEAR SLIP SPRING SLIP 2 WASHER THRUST WASHER SLIP ADJUSTER IDLER 2 UNIT OIL (FLOIL 948P) GREASE (PG-641) GREASE (MULTEMP AC-DM) SHIFT LE...

- 11 - 2-15. CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY SET POSITION : Upside down (Removal) 1. Remove the CAPSTAN BRAKE SPRING 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 BRA...

- 12 - b b c a a LOADING MOTOR ASSY FC HOLDER LOADINGWORM MOTORHOLDER LUG TERMINAL WORM WHEEL Fig. 2-16-1 WORM WHEEL LOADING WORM Apply GREASE (MULTEMP AC-DM) to the parts . Fig. 2-16-2 2-16. FC HOLDER, MOTOR HOLDER, LOADING WORM, LOADING MOTOR ASSY, WORM WHEEL SET POSITION : Normal (Removal) 1. Rel...

- 18 - a b A TENSION ARM REEL DISK (SP side) TENSION SPRING TENS AXIS HOLDER MAIN PLATE ASSY THRAUSTWASHER TENSION LEVER GREASE(MULTEMPAC-DM) a BELT LEVER BELT ADJUSTER Fig. 2-24 Fig. 2-25 2-24. BELT LEVER, BELT ADJUSTER SET POSITION : Normal Remove the following parts before replacing the BELT LEVE...

- 21 - CHARGE SPRING CHARGE ASSY SWING LEVER REEL DISK (SP side) Both Sides(Front/Back) MAIN PLATE ASSY a b c Back Front Fig. 2-29 2-29. CHARGE SPRING, SWING LEVER, CHARGE ASSY SET POSITION : Normal Remove the following parts before replacing the CHARGE SPRING, SWING LEVER, CHARGE ASSY. Refer to the...

- 26 - a b b c DRUM MOTORSTATOR ROTOR CASE Side View of END RING This side down. LEADCONNECTOR BRUSHSPRING BRUSH END RING UPPERDRUM ASSY SPACER LOWERDRUM ASSY Mark using a pen, etc.for conveniencein attachment. Fig. 2-34-1 a b C Reference Pin Catch Reference Pin andCatch have totouch each other. Par...

- 30 - 3. Interchangeability Adjustment of the Mechanism Note 1 : Tracking may need to be preset during 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 PLAYBACK mode, using the...

- 31 - 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) " ...

- 1 - TP2A TP5A TP5B TP2H LOCATIONS PCB-MAIN (Component side) REAR ELECTRICAL ADJUSTMENTS Perform only the alignments required. If proper equipment is not available, do not attempt an alignment. PRE-ADJUSTMENT SETTINGS • Set the PerfecTape  to “MANUAL” mode. TEST EQUIPMENT • Oscilloscope (10:1 prob...

- 1 - PARTS LIST 1. CABINET ASSEMBLY r w 1 !2 !1 8 3 6 7 t !0 9 !3

- 3 - !1 2 2 4 4 !9 !8 !6 !5 !4 !3 !2 !7 A 1 B 3 2. PACKING PARTS ACCESSORY A B

YNR DETAIL EMPH N.L EMPH MAIN EMPH PMMOD 13 L-DET VCA MAIN CONV1 60 58 MIX IC2A0Luminance/Chroma CCD LPF PCB-MAIN DECK J6004 V-IN1 14 LAGLEAD LPF (U77802041) BPF CLPF B-1 MAIN CONV2 SW CLPF BECK 35 CCD 46 MIX LEVEL ADJ TRAP LPF CLAMP 19 HPF ACC LPF HPF TRAP FBCALC 78 IC150Input Select 7 1 3 IC2A1Chr...

(U77802042) Rotary Trans Video Head HH 2H- COM 2H -R 2H-L 6H- COM 6H -R 6H-L 89 88 86 94 91 Head Amp FM AGC PEQ IC2A0Luminance/Chroma SIMPLE SDL G,EQ YLPF SQPB EQUALIZER NL DE-ENPH Q2A5 52 BD APC/ACC DET CK 55 DECK 11 10 7 8 6 PCB-MAIN Trap B-2 BPF 2M LPF ACC CTL Trap fn HPF HiFi Trap CLPF Delay MAI...

N 1 HS-U778 MC MR MH OS MS JP JQ DD DA MV SW MQ MT MD MW SU DC ST SV JR MU MP BB MA ML MF PCB-INTERCONNECT w PCB-MAIN e PCB-MAIN PCB-MAIN PRINTED CIRCUIT BOARDPARTS LAYOUT t r PCB-JACK o i PCB-OPE CONTENTS q PCB-MAIN (POWER) (Y/C/A) (HIFI) y PCB-MAIN (CONTROL) REMOTE HAND UNIT u PCB-MAIN (TIMER/OPE)...

N 11 HS-U778 2 1 F 3 + 1 1 + + K + 3 + 16 64 49 + 17 + 32 48 33 + 3 B E + + EB B E + + + + 9 + 51 55 60 65 70 75 80 95 90 85 81 + + A-OUT 7 65 + + 1 2 11 10 + + + + + E E + + + 8 7 1 2 + + + + + 1 4 6 + + 1 + + + + + + 35 31 30 25 20 15 10 5 + 31 21 A + + + + + + 100 95 90 85 81 75 70 55 60 + 45 40 ...