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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