Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo Video DV-K84N dv-k84n

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dv-k84n


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                     S/M No. : VK84NNTEF0




      Service Manual
      Video Cassette Recorder
      All models (K30 -Mecha)
      SYSTEM : NTSC
      Model : DV-K34/54/84NY-QF
              DV-K24/44/74/82/87NX-QJ/X
              DV-K26/46/27/47N-SJ
              DV-K79/84N-QJ
              DV-K26/46N-SX
              DV-K59N-QA
              DV-K76/77N-SF
              DV-K86N-SG
              DV-K81N-QK




DAEWOO ELECTRONICS CO., LTD.
            http : //svc.dwe.co.kr
TABLE OF CONTENTS
SPECIFICATION .......................................................................................................... 2
GENERAL ADJUSTMENTS ............................................................................................. 3
TROUBLESHOOTING GUIDES ....................................................................................... 4
 POWER CIRCUIT ................................................................................................................................4
 SERVO / SYSCON / LOGIC CIRCUIT ....................................................................................................5
 VIDEO CIRCUIT .................................................................................................................................12
 AUDIO CIRCUIT (Hi-Fi MODEL) ..........................................................................................................16
 AUDIO CIRCUIT (2 / 4 HEAD MODEL) .................................................................................................21
 EXTENDED DATA SERVICE CIRCUIT .....................................................................................................24

WAVEFORMS ............................................................................................................. 25
CIRCUIT DIAGRAM ...................................................................................................... 29
 INTERCONNECT WIRING DIAGRAM ....................................................................................................              29
 POWER SUPPLY SCHEMATIC DIAGRAM ...............................................................................................                30
 SYSCON CIRCUIT DIAGRAM ...............................................................................................................        31
 VIDEO/AUDIO SCHEMATIC DIAGRAM (2/4 HEAD) ................................................................................                     32
 VIDEO/AUDIO SCHEMATIC DIAGRAM (Hi-Fi) ........................................................................................                33
 PIF SCHEMATIC DIAGRAM (2/4 HEAD) ................................................................................................             34
 HI-FI SCHEMATIC DIAGRAM..............................................................................................................         35
 PIF&MPX SCHEMATIC DIAGRAM (Hi-Fi) .............................................................................................               36

INSTRUMENT DISASSEMBLY .......................................................................................... 37
ELECTRICAL PARTS LIST ............................................................................................... 43




                                                                               1
 SPECIFICATION

                                                   120 Volts AC 60Hz

                                                     DV-K34NY-QF        K54NY-QF     K84NY-QF     K24NX-QJ/X
                                                        K44NX-QJ/X      K74NX-QJ/X   K82NX-QJ/X   K87NX-QJ/X
                                                        K26N-SJ         K46N-SJ      K27N-SJ      K47N-SJ
                                                        K79N-QJ        K84N-QJ K26N-SX      K46N-SX
 Power Input
                                                       K59N-QA        K76N-SF K77N-SF      K86N-SG K81N-QK
                                                         DV-K* : INITIAL NUMBER IDENTIFICATION

                                                                   POWER INPUT       2HD   4HD    Hi-Fi
                                                                                     2.3    4.5    7.8

                                                   17 Watts (4-head Hi-Fi)
 Power Consumption
                                                   17 Watts (4-head, 2-head)
 Operating Temperature                             5 degree C to 40 degree C (41 degree F to 104 degree F)
 Storage Temperature                               -30 degree C to 65 degree C (-22 degree F to 149 degree F)
 Weight                                            7.8 Ibs : Net (9.5 Ibs : Gross)
 Dimensions                                        14.2 X 3.6 X11.0 Inches
                                                   4-head Hi Fi: Four video record/playback heads Rotary helical scan
                                                                    Luma: FM recording
                                                                    Chroma: converted subcarrier phase shifted recording
                                                                  Two audio record/playback heads
                                                                    Rotary helical scan, 2 channels FM recording
 Recording System                                  4-head:       Four video record/playback heads Rotary helical scan
                                                                    Luma: FM recording
                                                                    Chroma: converted subcarrier phase shifted recording
                                                   2-head:      Two video record/playback heads Rotary helical scan
                                                                    Luma: FM recording
                                                                    Chroma: converted subcarrier phase shifted recording
 Video Signal                                      EIA standard; NTSC color
 Antenna                                           75 ohm input impedance
 Video Signal Level                                1Vp-p (140 IRE standard)
 Audio Input Impedance                             More than 47K ohm
 Audio Output Impedance                            Less than 1.5K ohm
                                                   SP: 33.35mm/sec.
 Tape Speed
                                                   SLP: 11.13mm/sec
                                                   T-60: 3 hours/ EP (SLP) mode
 Maximum Recording Time
                                                   T120: 6 hours/ EP (SLP) mode
 Fast Forward/Rewind Time                          3 minutes (T-120 tape)
 Tuning System                                     Auto Program/Cable Compatible/Frequency Synthesis (FS)

Note: Specifications are subject to change without notice.




                                                             2
 GENERAL ADJUSTMENTS
PG (Pulse Generator) Shifter Adjustment (Fig. 7)

   Test Points:    PT01 PIN 3             Main
                   Video Out Jack         Rear Panel
   Adjust:         R595 (PG Shifter)      Main


The Pulse Generator (PG) Shifter determines the video head switching point during playback.
Misadjustment of the PG Shifter may cause head switching noise in the picture and/or vertical jitter.

1. Load the instrument with an alignment tape and play back the color bar signal or monoscope signal.
2. Connect channel-1 scope probe (1V/div.: 50



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