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S/M No. : KMUB1M1U01
Service Manual
Video Cassette Recorder
Model: ALL K-MECHA
MULTI MODELS
PAL/MESECAM/NTSC
(DV-K*84W Series)
(DV-K*64W Series)
(DV-K*24W Series)
(DV-K8K4W)
(DV-K#44W Series)
(DV-K#04W Series)
(DV-K#A4W Series)
(DV-K#B4W Series)
Note: 1. * : 8/4/2
2. # : 4/2
DAEWOO ELECTRONICS CO., LTD.
V V V V V
REDORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO
VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE
RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO
VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE
RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO
VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE
RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO CASSETTE RECORDER VIDEO
Contents
VIDEO CASSETTE RECORDER
SECTION 1. CONTROLS AND FUNCTIONS...........................................................................................2
SECTION 2. ELECTRICAL ADJUSTMENTS
2-1. SERVO CIRCUIT ADJUSTMENT METHOD...........................................................................................3
2-2. IF MODULE CIRCUIT ADJUSTMENT METHODS.................................................................................4
SECTION 3. CIRCUIT OPERATION PRINCIPLES
3-1. POWER CIRCUIT.......................................................................................................................................6
3-2. KEY FEATURES OF VIDEO IC AND ITS RELATIVES..........................................................................8
3-3. RECORD AND PLAYBACK PROCESSING CIRCUIT ...........................................................................8
3-4. IF CIRCUIT OPERATION ........................................................................................................................12
3-5. NORMAL AUDIO SIGNAL PROCESSING(LA71501BM) ....................................................................15
3-6. Hi-Fi AUDIO SIGNAL PROCESSING(BH7804K)..................................................................................16
SECTION 4. TROUBLESHOOTING FLOW CHART
4-1. POWER CIRCUIT.....................................................................................................................................19
4-2. PIF CIRCUIT..............................................................................................................................................21
4-3. LOGIC CIRCUIT .......................................................................................................................................23
4-4. SERVO-SYSCON CIRCUIT ....................................................................................................................24
4-5. AUDIO CIRCUIT (NORMAL) ...................................................................................................................32
4-6. AUDIO CIRCUIT (Hi-Fi)............................................................................................................................34
4-7. VIDEO CIRCUIT .......................................................................................................................................36
SECTION 5. WAVEFORMS ON VIDEO CIRCUIT ................................................................................43
SECTION 6.