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Daewoo DV-K884N-SJ Service Manual
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Daewoo DV-K884N-SJ Service Manual

Daewoo DV-K884N-SJ Service Manual

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S031GBA
DEAWOO ELECTRONICS CO., LTD
686, AHYEON-DONG MAPOGU,
SEOUL, KOREA.
C.P.O. BOX 8003 SEOUL KOREA
TELEX: DWELEC K28177-8
CABLE:"DAEWOOELEC"
FAX: +82.2.364-5588
TEL: +82.2.360-7114, 8114
http://www.dwe.daewoo.co.kr
PRINTED DATE: OCT. 1997
Service Manual
Model : DV-K884N-SJ
K884N-JJ
K884N-SG
K784N-SJ
K784N-JJ
K784N-SG
K884NY-SJ/M
K884NZ-SJ/M
K884NZ-SG/M
DV-K804N-SJ
 Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD
OVERSEAS SERVICE DEPT.

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Summary of Contents for Daewoo DV-K884N-SJ

  • Page 1 Service Manual Model : DV-K884N-SJ K884N-JJ K884N-SG K784N-SJ K784N-JJ K784N-SG K884NY-SJ/M K884NZ-SJ/M K884NZ-SG/M DV-K804N-SJ  Caution : In this Manual, some parts can be changed for improving, their DEAWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPOGU, performance without notice in the parts list. So, if you need the SEOUL, KOREA.

  • Page 2: Specifications

    SPECIFICATIONS Video Signal: EIA standard; NTSC color Power Input: 110~250 Volts AC50/60Hz ¡ Antenna: 75 ohm input impedance 120 Volts AC 60Hz ¡¡ Video Signal Level: 1Vp-p (140 IRE standard) Power Consumption: 19 Watts (4-head Hi-Fi) Audio Input Impedance: 47k ohms Operating Temperature: 5 degree C to 40 degree C Audio Output...
  • Page 3 TEST EQUIPMENT REQUIREMENTS AC Millivolt Meter NTSC Video Signal Generator–Must provide 1V p-p negative Sensitivity: 1.0mVAC–400VAC sync video across a 75 ohm load and produce standard NTSC 75% saturated color bars with a 100% white window. Dual-Trace Triggered Oscilloscope–with Lo–Cap (X10) and Direct Probes.
  • Page 4 EXTENSION CABLE CONNECTION A/C HEAD L/C MOTOR TO CAPSTAN MOTOR (CABLE2) TO DRUM MOTOR (CABLE1) (CABLE3) P201 P502 P601 P501 MAIN PCB...
  • Page 5 NOTE: PLACING THE UNIT IN THE SERVICE MODE Service option For this chassis, the sensors (start/end/reel) are located on the MAIN circuit board, not in the DECK assembly. There is an important service option that has to be followed to repair the MAIN circuit board with the DECK assembly connected. To imitate the function of the sensors, insert the SVC Mode Diode (D707) on the MAIN circuit board as shown below.
  • Page 6 LEADLESS (CHIP) COMPONENT REMOVAL INSTRUCTION • The following procedures are recommended for the replacement of the leadless components used in this unit. 1. Preparation for replacement 2. Removing the leadless component (Resistors, Capacitors) Grasp the leadless component body with tweezers and alter- a.
  • Page 7 3. Installing the Leadless (chip) Component 4. Removing of Flate ICs (Recommendable manner) 1) Presolder the contact points of the circuit board. 1) For removing solder chips from IC's pins, use a solder remover or a wiry solder absorber. 2) Heat the IC's tips evenly by moving the chip IC replacing tool around them, and detach the IC's leads with a tool in the way of using a lever.
  • Page 8 LEADLESS (CHIP) COMPONENT IDENTIFICATION 1. Check the followings before S.M.D Troubleshooting • Cracked or Chipped Component Body • Rejection of Solder from Copper Pads or Component • Cracked or Separated Solder Joints • Foreign Matter on Copper Pads • Peeling end Terminations or Fractured Leads •...
  • Page 9 ABBREVIATIONS A or AUD : Audio : Dropout Compensator A.E. : Audio Erase : Drain and Source : Alternating current : Decibel : Automatic Color Control : Automatic Frequency Control ENVE : Envelope : Automatic Fine Tuning : Automatic Gain Control : Generator : Automatic Level Control : Ground...
  • Page 10 : Picture : Test Jump : Picture Intermediate Frequency : Test Pin : Phase Locked Loop : Transistor : Phase Shift TRANS : Transformer : Pulse Width Modulator : Tracking : Power : Tuner : Transistor : Ultra High Frequency : Quasi Vertical : Volt, Vertical : Resistor, Right...
  • Page 11 OPERATION CONTROLS AND FUNCTION FRONT VIEW NOTE: Model-K884N-SJ, K884N-JJ, K884N-SG, K784N-SJ, K784N-JJ, K784N-SG, K884NY-SJ/M, K-884NZ-SJ/M, K884NZ-SG/M ! @ # $ ^ & * POWER STOP/EJECT PLAY NOTE: Model-K804N-SJ @ # $ VISS VIDEO INDEX SEARCH SYSTEM & *...
  • Page 12 ! POWER Button & PLAY/PAUSE Button Press this button to turn the VCR on or off. When the VCR is Press this button to play the recorded material. turned off, the timer recording is automatically turned on if it Playback indicator appears in the multifunction display. has been programmed.
  • Page 13 REAR VIEW NOTE: Hi-Fi model. & ANT IN VIDEO RF OUT AUDIO ! CH3 or CH4 Switch % Audio Output Connector Switch to CH3 or CH4 whichever is not used in your area to Permits audio connection of you VCR to a sound Equipment view tape in play mode and to use your TV set as a monitor.

  • Page 14: Instrument Disassembly

    INSTRUMENT DISASSEMBLY Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all leads/wiring are routed correctly when reassembling. Top Cover Removal Bottom Cover Removal (Fig. 1) (Fig. 3) 1. Remove three(3) screws Holding the top cover. 1.
  • Page 15 INSTRUMENT DISASSEMBLY (Continued) PCB Preamp Assembly Removal Main PCB Assembly Removal (Fig. 5) (Fig. 7) 1. Remove the top cover, the front panel and the bottom cover. 1. Remove the top cover, the front panel, the bottom cover, the 2. Disconnect the FPC (A). preamp assembly and the deck assembly.
  • Page 16 MECHANICAL DISASSEMBLY & Fig. 9 - Tape Transport Mechanism Identification (Top View) 1. Earth Bracket Ass’y 11. T-Sub Brake Ass’y 2. FE Head 12. Relay Lever 3. S-Slant Pole Ass’y 13. Capstan Motor 4. Tension Lever Ass’y 14. Pinch Lever Total Ass’y 5.
  • Page 17 MECHANICAL DISASSEMBLY (Continued) “ ‘ Fig. 10 - Tape Transport Mechanism Identification (Bottom View) 20. Capstan Motor 25. Record Safety Lever 21. F/L Rack 26. Loading Lever L 22. Connect Plate 27. Loading Lever R 23. Reel Belt 28. Drum Total Ass'y 24.
  • Page 18 MECHANICAL DISASSEMBLY (Continued) & Fig. 11 - Front Loading Mechanism Identification (Top View) 1. Top Plate Ass'y 7. Loading Shaft 2. F/L Bracket R 8. Loading Lever L 3. Prism Link R 9. Door Opener 4. Release Lever 10. Safety Lever 5.
  • Page 19 MECHANICAL DISASSEMBLY (Continued) Front Loading Mechanism Removal 4. Remove one (1) screw holding the prism link R and remove (Fig. 12) the prism link R from the F/L bracket R (Fig. 14). NOTE: The front loading mechanism must be in the eject position to remove it.
  • Page 20 MECHANICAL DISASSEMBLY (Continued) ƒR Screws are different Fig. 16- Loading Lever Ass’y Disassembly NOTE: Reassemble the cassette loading mechanism using the reverse procedures. Confirm that the two (2) bosses on the left side of the cassette holder are inserted into the groove in the left side of the top plate.
  • Page 21 MECHANICAL DISASSEMBLY (Continued) Fig. 21-1- A/C Head Assembly Alignment L/C Bracket Assembly Removal (Fig. 22) 1. Remove one (1) screw ! from the L/C bracket assembly @ Fig. 20- Loading Gears/Loading Rack Alignment and remove the L/C bracket assembly @ from the deck mechanism (Fig.
  • Page 22 MECHANICAL DISASSEMBLY (Continued) & Fig. 23- L/C Bracket Assembly Alignment Cam Gear, and F/L Rack Removal (Fig. 22) 1. Remove the cam gear & from the deck mechanism. 2. Remove the relay lever ^ from the main base %. 3. Remove the F/L rack * from the deck mechanism. Fig.
  • Page 23 MECHANICAL DISASSEMBLY (Continued) FE Head Removal (Fig. 31) Remove one (1) screw (1) and lift the FE head (2) from the main base. Fig. 28- Tension Band Fig. 27- Tension Band Assembly Alignment Assembly Removal (II) With Main Base Capstan Motor Removal (Fig.
  • Page 24 Some disassembly is required to access the adjustment locations. Refer to the "Disassembly Selection" in this publication for disassem- bly instructions. Caution: Use an isolation transformer when servicing. Mechanical Checks/Gear Alignment (Fig. 1, 2, 3, 4, 5) When mechanical problems occur or when reassembling parts in this mechanism, be sure to confirm the following instructions to con- firm the following: 1.
  • Page 25 3. There are two (2) triangular marks on the mode sense switch. When installing the L/C bracket assembly on the main base, confirm that the two (2) triangular marks are aligned with each other in the EJECT mode (Fig. 3). Fig.
  • Page 26 5. Confirm that the triangular mark "A" on the Loading Gear L Ass'y is aligned with the notch "B" in the Loading Gear R Ass'y in EJECT mode (Fig. 5). 6. Make sure that the teeth of the Loading Rack are aligned with the those of the Loading Gear R so that the hole "C" of the Loading Rack aligns with the circular mark "D"...
  • Page 27 Back Tension Measurement/Adjustment (Fig. 6, 7) 1. Confirm that the position of the tension pole is correctly positioned. If not, refer to the "Tension Pole Position Adjustment Proccedures". 2. Play back cassette torque meter (play torque) for about 20 seconds (wait until the tape transporting system comes to be stable). 3.
  • Page 28 Operating the VCR Without a Cassette Tape 1. Remove the cassette Loading Mechanism. 2. By hand revolve the worm counterclockwise 7-8 times until the pole base loading process starts automatically. 3. Then PLAY mode appears. If you want ANOTHER mode, Press the desired button. 4.
  • Page 29 MECHANICAL ADJUSTMENTS (Continued) Tape Path Alignment Procedures The tape transporting system is precisely aligned at the factory and under the normal circumstances will not require adjustment. However, if noise appears in the playback picture, then either the tape damage occured or the tape path has been changed, and readjustment of the tape path is necessary.
  • Page 30 THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM & ¤ TENSION POLE ¤ T-GUIDE ROLLER ¤ŁS-GUIDE POST ¤ A/C HEAD ¤ØFE HEAD ¤ T-GUIDE POST ¤ŒS-GUIDE ROLLER ¤æCAPSTAN SHAFT ¤ºS-SLANT POLE ¤ PINCH ROLLER ¤ DRUM ¤ VERTICAL POST ¤ T-SLANT POLE Fig.
  • Page 31 ADJUSTMENT PROCEDURES 3. Audio Azimuth Adjustment 1). Play back the Alignment Tape (SP mode) with the following 1. Rough adjustment of S&T Guide Rollers signal. When the parts shown in Fig. 9 are substituted, Tape Path can NTSC: 7KHz PAL: 6KHz change.
  • Page 32 7. Linearity Adjustment (Fig. 15) Test Points: CTL Pulse Test Pin Path Adj. Fixture Envelope Test Pin Path Adj. Fixture Observe: Oscilloscope Adjust: VR Control Path Adj. Fixture S/T Guide Rollers Transport Mech. 1). Connect the Path Adj. Fixture to PT01 on the Main circuit board.
  • Page 33 9. Transitional Operation Confirmation (Review to Play) (Fig. 18) Test Points: CTL Pulse Test Pin Path Adj. Fixture Envelope Test Pin Path Adj. Fixture Observe: Oscilloscope Adjust: VR Control Path Adj. Fixture S/T Guide Rollers Transport Mech. 1).Connect the Path Adj. Fixture to PT01 on the Main circuit board.
  • Page 34 10. Audio Output Confirmation (AC Head Tilt/Height 12. X-Axis Adjustment (Fig. 19) Adjustment Test Points: CTL Pulse Test Pin Path Adj. Fixture Test Points: Audio Out Audio Out Jack Envelope Test Pin Path Adj. Fixture Observe: Oscilloscope Observe: Oscilloscope Adjust: VR Control Path Adj.
  • Page 35 AC001 (K884NZ-SJ/M, K884NZ-SG/M only)
  • Page 40 CIRCUIT OPERATIONS 1. TIMER/SERVO/SYSCON CIRCUIT 1) PIN NAME & FUNCTION OF I-CHIP MICOM NAME PORT IN/OUT ASSIGNMENT ACTIVE IIC CLK P80/PBCTLmom OUTPUT HIFI, EEPROM IC CLOCK SERIAL LMref(H) CAP PWM P76/PWM1 OUTPUT CAPSTAN CONTROL PWM OUTPUT PULSE DRUM PWM P75/PWMO OUTPUT DRUM CONTROL PWM OUTPUT PULSE...
  • Page 41 NAME PORT IN/OUT ASSIGNMENT ACTIVE KEYIN 1 INPUT KEY DATA INPUT HIGH KEYIN 2 INPUT HIGH SEG 0 OUTPUT VFD SEGMENT OUTPUT PORT HIGH SEG 1 OUTPUT SEG 2 OUTPUT SEG 3 OUTPUT SEG 4 OUTPUT SEG 5 OUTPUT SEG 6 OUTPUT SEG 7 OUTPUT...
  • Page 42 2) FUNCTIONS BY BLOCK ! CTL Amplification & Waveshaping circuit CTL amplifier amplifies CTL signal read by CTL (–) Head, about 60dB regardless of modes. This amplified signal becomes a waveform in point A, and then output to CTL waveshaping through C508. Rec CTL signal is recorded to CTL (+) terminal by pin #21 during Rec mode.
  • Page 43 @ START/END SENSOR CIRCUIT IR LED START SENSOR SENSOR As it is difficult to deliver light due to direct insertion of IR LED & sensor on main PCB, it is delivered by reflection through prism. # Reel sensor circuit Reel sensor is directly inserted on main PCB and the transmission type is applied as below. Capstan motor speed in high-speed rewind mode is controlled by calculating the remain time of a tape with supply reel and take-up reel pulse.
  • Page 44 @ Grid/Segment Map – – – – – – – – – – – – – – – – – – – – – – – 4) FL display Bias Circuit -24V D717 3.9V R703...
  • Page 45 2. PIF & INPUT SELECTOR 1) Outline The circuit to tune proper signal of broadcasted radio frequency (RF: VHF, UHF) and to demodulate it to baseband signal for record. It is composed of two parts, TMI and Input selector. The former makes RF signal changed to composite video signal and audio signal, and the latter selects line input and RF input. * Refer to "PIF &...
  • Page 46 MODULATOR / TUNER / DEMODULATOR BLOCK DIAGRAM (MODULATOR SECTION) (TUNER SECTION) (DEMODULATOR SECTION) (IF SECTION) ANT IN Mixer Video RF Amp Filter Detector RF Carrier Oscillator Detector Filter RF Amp Mixer Video Modulator Modulator ANT OUT 4.5MHz Tank AUDIO IN CH SW VIDEO IN CLOCK DATA ENABLE...
  • Page 47 4) The name and function of Pins of Switching IC (LA7152); Hi-Fi Only Pin No. Name Function INPUT 1 CONTROL 1 INPUT 2 Tuner INPUT PIN CONTROL 2 TUNER/LINE SELECT, TUNER 'H' INPUT 3 LINE INPUT PIN MUTE OUTPUT VIDEO OUTPUT PIN Vcc 5V 5) The name and function of Pin on MPX module (Hi-Fi Only) Pin No.
  • Page 48 6) Operation When the RF signal received by antenna is input to TMI Antenna Input and user selects a channel, the CH control data (clock, data, enable) memorized in a MI-COM is output. The data runs PLL IC of TMI tuner part and outputs the selected channel to IF module. The input signal in IF module is demodulated to video signal on video detector part through IF amp and saw filter, and is output through 4.5MHz trap circuit.
  • Page 49 8) The operation of MPX IC (SBX 1837) Hi-Fi Only ! L + R (MAIN) MPX signal is input from Pin 39 (COMP IN), and SAP and TELEMETRY signals are suppressed by stereo LPF. Then, pilot cancel is carried out. Finally L-R and SAP signals are eliminated by MAIN LPF and frequency characteristics are rendered flat by de-emphasis to be input to the matrix.
  • Page 50 ST.LED 2fH 0˚ DRIVE PILOT fH 90˚ (VCO) MODE fH 0˚ CONTROL (COMP IN) STEREO LPT MAIN LPF DE EM (MAIN OUT) (MAIN IN) PILOT CANCEL SUB LPF (SBU OUT) MATRIX (L-OUT) (DSB) (ST IN) L–R NR SW (R-OUT) SAP (FM) dbx-TV SAP BPF SAP LPF (SAP OUT)
  • Page 51 3. VIDEO & AUDIO CIRCUIT 1) Video circuit ! EEmode 1.0V Vp-p video signal out of jack or TMI (Tuner, modulator, If) is input to SW IC151. One of them is selected and output to Pin 14 and them input to Pin 42 of IC301 (LA71004) for video signal process. This signal is amplified 6dB through sync and peak AGC (Auto Gain Control) and 2Vp-p signal is output Pin 39 through QV/QH Insert circuit.
  • Page 52 B. Color Signal Processing The FM signal input to pin 11 of IC301, which is originally come from pin 10 of ICA01, passes through 1.3MHz LPF to pass only 629KHz color signal down-converted in record mode. ACC (Automatic Color Control) AMP stabilized the color signal. The stabilized signal is input to main converter and mixed with the 4.21MHz signal come from sub-converter.
  • Page 53 REC LUMINANCE PROCESS IC151 IC301 LINE JACK INPUT SELECT AGC AMP 6M LPF COMB FILTER NL EMPH W/D CLIP DETAIL ENHANCER MAIN EMPH CLAMP BUFFER MODULATOR 2HD * IC A01 (PRE AMP) Y-FM OUT REC EQ HEAD CHROMA IC A01 REC COLOR PROCESS IC151 IC301...
  • Page 54 PB LUMINANCE PROCESS IC301 ICA01 EQ AMP FM EQ PHASE COMP HEAD 2HD 7 FM AGC DOUBLE LIMITTER FM DEMOD SUB LPF IC302 MAIN DEEMPHASIS BUFFER 3M LPF DOUBLE NONLINEAR PICTURE NOISE Y/C MIX QV/QH INSERT DEEMPHASIS CONTROL CANCELLER LINE JACK VIDEO AMP IC S01 PB COLOR PROCESS...
  • Page 55 OSD IC PIN NAME & FUNCTION Pin Functions Pin No Symbol Function Ground Xtal Crystal oscillator connection Xtal OUT1 HSYNC Horizontal synchronization output Xtal Crystal oscillator connection Xtal OUT2 VSYNC Vertical synchronization output Enable input Data input SCLK Clock input SECAM SECAM mode switch input/output (command switch) 525/625...
  • Page 56 2) Audio circuit 1) Outline This Audio Circuit use LA71004M A/V one chip IC of Sanyo's. The major feature of this IC is that has a Recording Bias current auto- control circuit. So it is controlled by circuit automatically to keep consistent Recording current regardless change of head impedance. Prior IC is used variable resistor to control Recording current passively.
  • Page 57 3) Control Mode Specification ! Mute control (pin 54) Control Port Function Mode Mute Line SW Mute open Except for Mute close H: 1.8~5.0V, L: 0.0~1.2V @ PB/EE control (pin 55) Control Port Mode PB/EE H: 3.3~5.0V, L: 0.0~2.7V # REC/EE control (pin 56) Control Port Mode REC/EE...
  • Page 58 $ Rec Mode ¤˝When Rec "H" signal is applied, Audio Head (Rec) point will be opened (EE & PB: GND) and coil will be oscillated by switching circuit for High voltage and then starting rec. mode. ¤˛Electronic potential difference between Vcc (5V) and pin #3 has to be in 2.0-4.3V to coil oscillate. In other words, Voltage of pin #3 has to be in 0.7~3.0V p-p.
  • Page 59 ¤ In case of this IC, Peaking the high band frequency inside of IC itself without Peaking Coil using reactance of R/P Head. This is a different to prior Audio circuit. So, to adjust frequency characteristics, in this circuit, we are using R223 & C222. Fig.
  • Page 60 4. HI-FI AUDIO CIRCUIT 1) How to make TA1246F fo adjustment-free In TA1246F, Zener Zap (the way to destruct Zener Diode) is used for making FM modulation fo adjustment-free. As it is basically simi- lar to OTP (One Time Memory), fo of the IC is already set by IC makers so its adjustment is not required. For your reference, how to adjust fo is explained as below;...
  • Page 61 2) Operation of PNR Circuit ! The role & effect of PNR PNR (Peak Noise Reduction) is the way to reduce noise while recording and playing back VHS Hi-Fi audio. PNR circuit reduces signal half in Record mode and magnifies it double in Playback mode. As the result, noise occurred in Playback mode (due to tape or head) can be automatically reduced together, and both input and output can get same Dynamic Range.
  • Page 62 # TA1246F PNR system It is possible to make the below system because TA1246F can have same VHS Hi-Fi characteristics even with less parts and less con- stants. • Playback and recording uses same circuit, which is located in feedback loop of MOS (Main OP Amp). The characteristics of Emphasis and De-Emphasis can be acquired by controlling the feedback loop.
  • Page 63 3) Audio Processor pin Name Line. 3(R) IN PB FM IN Vref out ENV. Det. out NR Emph Filter(R) Hi-Fi. Det. out DC.F.B(L) Switching Pulse IN Line. 3(L) IN Zener Zap Pulse IN Weighting Filter. 1(L) FM Mod. Monitor Weighting Filter. 2(L) Normal Audio IN Peak Det.
  • Page 64 4) Signal Flow & Operation in Record/Playback Modes Figure 7 shows the flow of signal in Record & EE mode. Monaural Norm. Audio Out Norm. Audio IC IC Pin NO. Line Out 1µ Output Input Line IN Selector TV IN Selector Through 120k...
  • Page 65 5) Operation of Main Blocks ! Input Selector It selects one of TV In, Line In 1/2/3 by Bus Data. And also, it selects output of Normal Audio IC. @ Output Selector It selects output mode each of Hi-Fi/L CH/R CH, Line 2/3 monitor by Bus Data. # EVR (Electronic Volume Resistor) It controls audio record level by the voltage of port 40/42.
  • Page 66 ELECTRICAL ADJUSTMENTS Fig. 1 - Circuit Board Location...
  • Page 67 ELECTRICAL ADJUSTMENTS (Hi-Fi MODEL) A/V JACK PT01 R191 STEREO SEPARATION POWER SUPPLY SHIFTER R595 DECK ASSAMBLY ƒR FRONT Fig. 2 - Main board test point/control location guide (Component)
  • Page 68 ELECTRICAL ADJUSTMENTS (Hi-Fi MODEL) PG (Pulse Generator) Shifter Adjustment (Fig. 3) Stereo Separation Adjustment PT01 PIN # Test Points: Main Test Points: (–) Terminal of C166 Main Video Out Jack Rear Panel Adjust: R191 Adjust: R595 (PG Shifter) Main 1. Connect scope prove to (–) Terminal of C166. The Pulse Generator (PG) Shifter determines the video head switching point during playback.
  • Page 69 LUMA/CHROMA WAVEFORMS (IC301-11) 400mVp-p (IC301-11) 450mVp-p (IC301-15) 380mVp-p (IC301-14) 1.3Vp-p 200mV/10µsec/cm 200mV/10µsec/cm 200mV/5µs/cm 500mV/10µsec/cm PLAY PLAY & (IC301-22) 450mVp-p (IC301-26) 520mVp-p (IC301-27) 510mVp-p (IC301-29) 550mVp-p 200mV/5ms/cm 200mV/10µsec/cm 200mV/10µsec/cm 200mV/10µsec/cm PLAY & (IC301-29) 550mVp-p (IC301-30) 520mVp-p (IC301-30) 540mVp-p (IC301-32) 480mVp-p 200mV/10µsec/cm 200mV/10µsec/cm 200mV/10µsec/cm 200mV/10µsec/cm...
  • Page 70 LUMA/CHROMA WAVEFORMS (IC301-37) 5.2Vp-p (IC301-39) 2.4Vp-p (IC301-39) 2.4Vp-p (IC301-44) 5Vp-p 1V/5msec/cm 1V/10µsec/cm 1V/10µsec/cm 2V/10msec/cm PICTURE SEARCH PLAY REC/PLAY (IC301-49) 600mVp-p 200mV/0.5µsec/cm REC/PLAY...
  • Page 71 AUDIO WAVEFORMS (IC301-57) 90mVp-p (IC301-59) 1.5Vp-p (IC301-60) 0.3Vp-p (IC301-64) 2Vp-p 20mV/0.2msec/cm 0.5V/0.2msec/cm 50mV/0.2msec/cm 0.5V/0.2msec/cm “ ‘ (IC301-8) 85mVp-p (T201-5) 60Vp-p (T201-6) 75Vp-p 20mV/0.5msec/cm 30V/20µsec/cm 40V/20µsec/cm PLAY...
  • Page 72 SERVO WAVEFORMS (IC601-3) 5.5Vp-p (IC601-4) 5Vp-p (IC601-18) 5Vp-p (IC601-23) 5Vp-p 2V/5µsec/cm 2V/5µsec/cm 2V/5msec/cm 2V/10msec/cm REC/PLAY REC/PLAY REC/PLAY REC/PLAY (IC601-24) 5Vp-p (IC601-22) 5Vp-p (IC601-39) 5Vp-p (IC605-7) 4Vp-p 2V/0.5msec/cm 2V/0.2msec/cm 2V/50msec/cm 2V/5msec/cm REC/PLAY REC/PLAY REC/PLAY REC/PLAY (IC605-1) 4Vp-p (IC605-1) 3Vp-p 2V/5msec/cm 1V/5msec/cm PLAY...
  • Page 73 Hi-Fi AUDIO WAVEFORMS (IC901-45) 360mVp-p (IC901-7) 900mVp-p (IC901-22) 1100mVp-p (IC901-25) 400mVp-p 100mV/0.5msec 200mV/0.5msec 500mV/1msec 200mV/2msec EE/REC/PLAY EE/REC PLAY (IC901-33) 900mVp-p (IC901-47) 360mVp-p 200mV/0.5msec 100mV/0.5msec EE/REC EE/REC/PLAY...
  • Page 74 1) PREAMP VOLTAGE CHARTS (4-HEAD) MODE PREAMP MODE PREAMP REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No. PIN No. STOP PLAY STOP PLAY F.FWD SEARCH PAUSE PAUSE F.FWD SEARCH PAUSE PAUSE 2) POWER VOLTAGE CHARTS MODE POWER MODE POWER REW/ REV/FWD PLAY REW/...
  • Page 75 3) VIDEO (LUMA/CHROMA) AND LINEAR AUDIO VOLTAGE CHARTS MODE IC VIDEO/AUDIO MODE IC VIDEO/AUDIO REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No. PIN No. STOP PLAY STOP PLAY F.FWD SEARCH PAUSE PAUSE F.FWD SEARCH PAUSE PAUSE 0.7-3.0 Q201 -17.5 -17.5 -17.5 Q202 -17.5...
  • Page 76 MODE IC VIDEO/AUDIO MODE IC VIDEO/AUDIO REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No. PIN No. STOP PLAY STOP PLAY F.FWD SEARCH PAUSE PAUSE F.FWD SEARCH PAUSE PAUSE Q301 Q351 Q303 4) OSD VOLTAGE CHARTS MODE IC OSD MODE IC OSD REW/ REV/FWD PLAY...
  • Page 77 6) SWITCHING IC PIN VOLTAGE (HI-FI ) MODE MODE PIN NO NAME EE. REC EE. REC REMARK PIN NO NAME EE. REC EE. REC REMARK (TUNER) (LINE) (TUNER) (LINE) INPUT 1 LINE INPUT CONTROL 1 MUTE TUNER INPUT OUTPUT CONTROL 2 TUNER 'H' Q153 TUNER...
  • Page 78 7) SERVO/SYSCON/TIMER u-COM VOLTAGE CHARTS MODE U-COM MODE U-COM REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No. PIN No. STOP PLAY STOP PLAY F.FWD SEARCH PAUSE PAUSE F.FWD SEARCH PAUSE PAUSE -23.8 -11.8 -14.7 -14.7 -11.7 -7.5 -9.5 -23.8 -20.0 -11.7 -15.7 -15.7...
  • Page 79 MODE U-COM MODE U-COM REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No. PIN No. STOP PLAY STOP PLAY F.FWD SEARCH PAUSE PAUSE F.FWD SEARCH PAUSE PAUSE ( ): LED MODEL MODE IC DRIVE MODE IC DRIVE REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No.
  • Page 80 8) AUDIO Hi-Fi VOLTAGE CHARTS MODE Hi-Fi AUDIO MODE Hi-Fi AUDIO REW/ REV/FWD PLAY REW/ REV/FWD PLAY PIN No. PIN No. STOP PLAY STOP PLAY F.FWD SEARCH PAUSE PAUSE F.FWD SEARCH PAUSE PAUSE IC901 Q901 MODE Hi-Fi PRE-AMP AUDIO MODE Hi-Fi PRE-AMP AUDIO REW/ REV/FWD...

  • Page 81: Power Circuit

    TROUBLESHOOTING GUIDES POWER CIRCUIT Caution: When checking the primary circuit, be sure to use an isolation transformer. NO OUTPUT Voltage Does the AC power cord Change AC CORD check OK? Is 140V supplied to pin !,@ Check F801/L801/ of SM801 primary? D801/C806 Is output voltage of SM801 Change SM801...
  • Page 82 TROUBLESHOOTING GUIDES (Continued) SERVO/SYSCON/LOGIC CIRCUIT Digitron does not operate. Is+5V supplied to Check the pin of IC601? D804 Is-24V supplied to Check power circuit. pin of IC601? Are -20 and -16.5V Check the power circuit supplied to pin and D717. of G701? Is 5V at pin Check IC604.
  • Page 83 TROUBLESHOOTING GUIDES (Continued) LED or Digitron is lit but key do not operate. Is each key pulse Check key matrix applied to pin , 49 50 circuit. of IC601? Check IC601 1 minute back up timer does not operate. When disconnecting the power cord,Is 5.0V Check C813.
  • Page 84 TROUBLESHOOTING GUIDES (Continued) When change the channel broadcast signal is not received. Is the output of pin , , and of IC601 Check IC601 77 79 normal? Check the Video, Check the video output Check the Audio output signal of signal pin of IC303 IC601...
  • Page 85 TROUBLESHOOTING GUIDES (Continued) Playback picture is not good. Noise appears although adjusting Adjust tracking. tracking. Noise shakes up Noise appears Check and and down on the although change re-adjust the screen. cassette tape. Path of Deck. Adjust the HEAD Is CTL pulse applied CTL HEAD height is height and remove normal and there is...
  • Page 86 TROUBLESHOOTING GUIDES (Continued) Playback picture is not good. Noise appears over the entire Check TS Flowchart (E) screen Is SW pulse supplied Are SW pulse and Check D.PG input from pin 8 of IC601 (IC601 pin +) HA SW applied to PRE-AMP circuit? and connector (P502) Check pattern...
  • Page 87 TROUBLESHOOTING GUIDES (Continued) Drum Motor dose not rotate. Is 12V supplied to P502 Check power circuit. pin !? Is D.PWM (pin $) Check IC601 and D.FG. of IC601 correct Is the voltage of P502 pin @ Check R503, R523 and C506 1.2V? Check connector (P502) and DRUM Motor...
  • Page 88 TROUBLESHOOTING GUIDES (Continued) Drum Motor and Capstan M/T rotate at irregular speed(In REC mode). Is C.Sync applied to Check C.Sync of video circuit. pin ‹ of IC601? Check IC601 The instrument goes into the emergency mode front display shows "err"when AC power is connected.
  • Page 89 TROUBLESHOOTING GUIDES (Continued) Cassette loading inoperative. Is Motor 12V Check power circuit. (IC602 pin & and *) suppiled? Is 6V applied to pin $ of Check R631, D601, IC602 IC602. Is 5V applied to pin ^ of Pin R of IC601. IC602 when CST IN? Is 6.2V applied to pin ) of Change IC602.

  • Page 90: Video Circuit

    TROUBLESHOOTING GUIDES (Continued) VIDEO CIRCUIT EE MODE Picture NG Is video signal input into pin # Check PIF circuit and and ^ of IC303 LINE IN JACK Is 5V supplied at pin ( Check power circuit. of IC151 Check IC601 pin M Is signal output from pin * Tuner mode: H of IC303...
  • Page 91 TROUBLESHOOTING GUIDES (Continued) PB video signal missing. Is envelope output from Is 5V supplied at Check power ICA01 pin ) ? ICA01 pin 5 ? circuit Is SW pulse input into Check IC601 ICA01 pin % ? pin 8 Clean head or change head Is signal input at IC301 Check PCB...
  • Page 92 TROUBLESHOOTING GUIDES (Continued) Record video signal NG (4 head and 4-head HiFi model) Check EP mode Is Iuminance and color Is signal input into Check input selector signal output from IC301 pin o ? circuit IC301 pin 1,4 ? Is REC signal input into Check RA01, RA02, CA11 ICA01 pin 1 ? Is +5V supplied at...
  • Page 93 TROUBLESHOOTING GUIDES (Continued) OSD Character Incorrect. Is 5V supplied at ICS01 pin e,7 ? Check power circuit. Is composit video signal Check IC301 output from IC301 pin I ? Check serial data ICS01 pin *,(,) Check IC601 Change ICS01...
  • Page 94 TROUBLESHOOTING GUIDES (Continued) AUDIO CIRCUIT (Hi-Fi MODEL) No sound in the E-E mode Is 9V applied to pin U ? of IC901? Check power circuit. Is 5V applied to pin + of IC901 and pin J of IC301? Is signal input pin {,} Check INPUT JACK of IC901 in line mode? Is 0V applied to pin )
  • Page 95 TROUBLESHOOTING GUIDES (Continued) No Hi-Fi sound in playback mode of Hi-Fi recorded tape. Is the ENVE level of IC901 pin Q Check the ICH01 of PRE-AMP circuit more than 200mVp-p? Is A.SW PULSE input into Check IC601 pin w of IC901? Is the ENVE level into pin Q Is pin W of IC901 0V ? Change IC901...
  • Page 96 TROUBLESHOOTING GUIDES (Continued) No Hi-Fi sound in the playback mode after Hi-Fi recording. Check the following procedure in RECORD mode Is the signal applied to Check IC151 pin O,P of IC901? IS 5V Base of Q204? Check IC601 Is there output at Check IC901 pin ‘...
  • Page 97 TROUBLESHOOTING GUIDES (Continued) No sound in the linear playback mode Is the output at pin Is 9V applied pin Check Power circuit 1,3 of IC901? U of IC901? Is 5V applied to pin + Check Power circuit of IC901 and pin J of IC301? Is there Audio output Check A/C head...
  • Page 98 TROUBLESHOOTING GUIDES (Continued) No linear sound in the playback mode after linear recording. Check the following procedure in RECORD mode. Is the signal applied to pin {,} Check INPUT JACK of IC901 and pin G of IC301? Check IC601 Is 5V Base of Q204? Is there output at pin Check IC301 k of IC301?
  • Page 99 INTERCONNECT WIRING DIAGRAM K884N/K784N/K804N Hi-Fi INTERCONNEC WIRING DIAGRAM REV.1 97. 2. 5...
  • Page 100 POWER SUPPLY SCHEMATIC DIAGRAM (FREE VOLTAGE) K884NY-SJ/M K884NZ-SJ/M K884NZ-SG/M...
  • Page 101 POWER SUPPLY SCHEMATIC DIAGRAM (120V ONLY) K884N-SJ/K884N-JJ/K884N-SG/K784N-SJ/K784N-JJ/K784N-SG/804N-SJ...
  • Page 102 PRE-AMP SCHEMATIC DIAGRAM K884N/K784N/804N Hi-Fi PREAMP SCHEMATIC DIAGRAM REV.1 97. 2. 5...
  • Page 103 VIDEO & AUDIO SCHEMATIC DIAGRAM K884N/K784N/K804N...
  • Page 104 PIF & MPX SCHEMATIC DIAGRAM K884N/K784N/K804N Hi-Fi PIF & MPX SCHENATIC DIAGRAM REV.1 97. 2. 5...
  • Page 105 TIMER & SYSCON SCHEMATIC DIAGRAM K884N/K784N/K804N...
  • Page 106 Hi-Fi AUDIO SCHEMATIC DIAGRAM K884N/K784N/K804N Hi-Fi AUDIO SCHEMATIC DIAGRAM REV.1 97. 2. 5...
  • Page 107 POWER SUPPLY BLOCK DIAGRAM (FREE VOLTAGE) K884NY-SJ/M K884NZ-SJ/M K884NZ-SG/M...
  • Page 108 POWER SUPPLY BLOCK DIAGRAM (120V ONLY) K884N-SJ/K884N-JJ/K884N-SG/K784N-SJ/K784N-JJ/K784N-SG...
  • Page 109 PRE-AMP BLOCK DIAGRAM K884N/K784N/K804N Hi-Fi PREAMP BLOCK DIAGRAM REV.1 97. 2. 5...
  • Page 110 VIDEO & AUDIO BLOCK DIAGRAM K884N/K784N/K804N Hi-Fi VIDEO & BLOCK DIAGRAM REV.1 97. 2. 5...
  • Page 111 PIF & MPX BLOCK DIAGRAM K884N/K784N/K804N Hi-Fi PIF & MPX BLOCK DIAGRAM REV.1 97. 2. 5...
  • Page 112 TIMER & SYSCON BLOCK DIAGRAM SEG C~SEG F G3. G4. G6. G7. G8 K884N/K784N/K804N Hi-Fi TIMER & SYSCON BLOCK DIAGRAM REV.1 97. 2. 5...
  • Page 113 Hi-Fi AUDIO BLOCK DIAGRAM K884N/K784N/K804N AUDIO BLOCK DIAGRA REV.1 97. 2. 5...
  • Page 114 PACKING AND ACCESSORY ASS'Y & Part Name Part No. Q'ty Description Remark PAD FRONT/BACK 97P4925200 K804N K884N 97P4922300 K784N POLYBAG FOR SET 97P4803100 P.E ROAM BOX CARTON 97P5043000 EX300*SCP150*EX300 MANUAL OWNERS 97P9560000 ALL MODEL CABLE RF 97P880RN15 NTSC 1.5M COVER ACCESSORY 97P0424100 LD-PE TO.1 K884N-SG...
  • Page 115 Caution : In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) ELECTRICAL PART LIST 1.
  • Page 116 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS C314 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP C315 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP C317 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP C318 CEXF1H479A C ELECTRO 50V RSM 4.7MF 4X7 C319...
  • Page 117 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS C602 HCFK103ZCA C CHIP CERA 50V Y5V 0.01MF Z 2012 C603 CEXF1C470A C ELECTRO 16V RSM 47MF (5X7) TP C605 HCQK180JCA C CHIP CERA 50V CH 18PF J 2012 C606 HCQK180JCA C CHIP CERA...
  • Page 118 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS C902 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 C903 HCFK103ZCA C CHIP CERA 50V Y5V 0.01MF Z 2012 C904 CEXF1A221V C ELECTRO 10V RSS 220MF 6.3X11 C905 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP C906 HCBK683KCA...
  • Page 119 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS CS15 HCLK201JCA C CHIP CERA 50V SL 200PF J 2012 CS17 HCLK101JCA C CHIP CERA 50V SL 100PF J 2012 CS18 HCLK101JCA C CHIP CERA 50V SL 100PF J 2012 CS19 HCLK101JCA C CHIP CERA...
  • Page 120 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS GH01 97P2340200 HOLDER DIGITRON H701 1TFMX5380- IC UNIT R/RECEIVER TFMX5380(38KHZ) PREAMP A 1TS0P1238X IC UNIT R/RECEIVER TSOP1238XG1 (38KHZ) IC151 1SBX183701 IC HYBRID SBX1837-01 IC301 1LA71004M- IC VIDEO/AUDIO LA71004M A/V 1 CHIP IC302 1LC89962-- IC VIDEO...
  • Page 121 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS P501 97P62T112A CONN B/B (PLUG) TKC-GP PLUG 10P P502 97P62T1126 CONN B/B (PLUG) TKC-GP PLUG 6P P601 97P8810710 CONN ASS'Y 7H-7S,100MM P801 97P62Y04X4 CONN WAFER YW396 4P NC PT01 97P6269000 CONN WAFER 00-8283-0612-00000...
  • Page 122 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS R153 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R154 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R155 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R156 RD-AZ750J- R CARBON FILM 1/6 75 OHM J R157...
  • Page 123 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS R312 RD-AZ182J- R CARBON FILM 1/6 1.8K OHM J R313 HRFT103JCA R CHIP 1/10 10K OHM J 2012 R319 HRFT103JCA R CHIP 1/10 10K OHM J 2012 R332 HRFT822JCA R CHIP 1/10 8.2K OHM J 2012 R334...
  • Page 124 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS R607 HRFT103JCA R CHIP 1/10 10K OHM J 2012 R608 RD-AZ273J- R CARBON FILM 1/6 27K OHM J R609 RD-AZ201J- R CARBON FILM 1/6 200 OHM J R610 HRFT273JCA R CHIP 1/10 27K OHM J 2012 R611...
  • Page 125 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS R707 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R708 RD-AZ201J- R CARBON FILM 1/6 200 OHM J R709 RD-AZ201J- R CARBON FILM 1/6 200 OHM J R708 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R713...
  • Page 126 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS R707 RD-AZ101J- R CARBON FILM 1/6 100 OHM J SW151 5S30102119 SW SLIDE JSS 1207 SW601 5S70101059 SW MICRO SPPB62 SW701 5S50101Z97 SW TACT SKHV10914A 9.5M AUTO A 5S50101Z96 SW TACT KSM0614BTS 9.5M AUTO A 5S50101Z98...
  • Page 127 BASIC LED VCR+ SYM NO PART-CODE PART-NAME PART-DESC MODEL -DIS &2HRS CA07 HCFK103ZCA C CHIP CERA 50V Y5V 0.01MF Z 2012 CA08 HCFK104ZCA C CHIP CERA 50V Y5V 0.1MF Z 2012 CA09 HCFK104ZCA C CHIP CERA 50V Y5V 0.1MF Z 2012 CA10 HCFK103ZCA C CHIP CERA...
  • Page 128 R CHIP 1/10 10K OHM J 2012 NOTEs)"ƒN ": Only apply to the model for Middle-America. (Free-Volt) DV-K884NY-SJ/M,K884NZ-SJ/M,K884NZ-SG/M "%" : Only apply to the model for North-America. (AC 120V) DV-K884N-SJ,K884N-JJ,K884N-SG,K784N-SJ,K784N-JJ, K784N-SG,K804N-SJ "BASIC MODEL" : DV-K884NY-SJ/M "LED-DIS." : K784N-SJ,K784N-JJ,K784N-SG "VCR+ & 2HRs" : K884N-JJ,K784N-JJ, "-"...

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