Zenith XBS448 manuals

Zenith XBS448 Service Manual (124 pages)

Brand: Zenith | Category: Cassette players | Size: 14.64 MB |

English

Table of contents

CONTENTS

1

SECTION 1

2

A.C. Voltmeter

3

SERVICING PRECAUTIONS

4

SECTION 2

5

CABINET & MAIN CHASSIS

5

5. Packing Accessory Section

10

SECTION 3

11

ELECTRICAL

11

OVERALL WIRING DIAGRAM

12

VCR PART

13

1. Power(SMPS) CIRCUIT

14

2. SYSTEM/KEY CIRCUIT

16

(1) AUTO STOP

16

Caution :

16

3. SERVO CIRCUIT

17

(1) Unstable Video in PB MODE

17

(2) When the Drum Motor

17

(2) doesn’t run

17

2. SERVO CIRCUIT

18

5. Y/C CIRCUIT

20

(1) No Video in EE Mode

20

3. Y/C CIRCUIT

21

6. Tuner/IF CIRCUIT

24

(2) No Sound

25

7. Hi-Fi Circuit

26

BLOCK DIAGRAMS

29

3. Y/C BLOCK DIAGRAM

31

4. NORMAL AUDIO BLOCK DIAGRAM

32

5. Hi-Fi BLOCK DIAGRAM

33

LA72670M

33

6. SYSTEM BLOCK DIAGRAM

34

CIRCUIT DIAGRAMS

35

3-32 3-33

36

3-34 3-35

37

4. A/V CIRCUIT DIAGRAM

38

5. Hi-Fi CIRCUIT DIAGRAM

39

6. SYSTEM CIRCUIT DIAGRAM

40

7. KEY CIRCUIT DIAGRAM

41

• WAVEFORMS

42

• CIRCUIT VOLTAGE CHART

43

PRINTED CIRCUIT DIAGRAMS

44

LOCATION GUIDE

44

NOTES) Warning

45

3. KEY 1(LEFT) P.C.BOARD

46

4. KEY 2(RIGHT) P.C.BOARD

46

DVD & AMP PART

47

2. Test & debug flow

48

Check the laser power circuit

51

ACKL, ASDAT3)

53

2. SDRAM CLOCK

57

3. TRAY OPEN/CLOSE SIGNAL

57

1) Tray open/close waveform

57

2) Tray close waveform

58

3) Tray open waveform

58

8. FOCUS ON WAVEFORMS

62

11. RF WAVEFORM

65

1) Full colorbar signal(CVBS)

65

(IC507 PIN 26)

66

FIG 12-3

66

(IC507 PIN 21)

66

FIG 12-2

66

1) Audio L/R

67

2) Audio related Signal

67

1. Overall Block Diagram

69

2. SERVO Block Diagram

70

IIC501 (MPEG + DSP )

71

MT1379EEC

71

INTERFACE

72

LH-C444M

73

3-83 3-84

76

LC875747B

77

3-85 3-86

77

3-87 3-88

78

3-89 3-90

79

3-91 3-92

80

• Top View

86

• Bottom View

86

(Figure A-1)

87

Fig. A-1

87

Fig. A-2

88

Gear Rack F/L

89

Gear Drive

89

Fig. A-4

91

Fig. A-5

92

17. Opener Lid (Fig. A-5-2)

92

19. Arm T/up (Fig. A-5-4)

92

Fig. A-9

96

34. Base Tension (Fig. A-9-1)

96

DECK MECHANISM ADJUSTMENT

100

2. Essential Check and Repair

105

3. Regular Check and Repair

105

4. Tools for Check and Repair

105

5. Maintenance Process

105

Cam Part

106

(KG-684G , GREEN)

106

EXPLODED VIEWS

113

DECK MECHANISM PARTS LOCATION

118

DECK MECHANISM DISASSEMBLY

119

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