Sharp DV-NC70 User Manual

DV-NC70/W
DV-NC70X/RU
S92Q5DV-NC70/
SERVICE MANUAL
CONTENTS
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
MODELS
DV-NC70
DV-NC70W
DV-NC70X
DV-NC70RU
VCR/DVD COMBINATION MODEL
SHARP CORPORATION
OPEN/CLOSE
EJECT/STOP
REW
REC
CH
VCR/DVD
SELECTOR
TIMER
VCR DVD
PLAY
STOP
AV 2 IN
VIDEO
L
(
MONO
)-
AUDIO
-
R
/
OPERATE
PLAY/×2
Page
1. IMPORTANT SERVICE NOTES ........................................................................................................ 2
2. FEATURES ........................................................................................................................................ 3
3. SPECIFICATIONS ............................................................................................................................. 3
4. PART NAMES .................................................................................................................................... 5
5. MAINTENANCE CHECK ITEMS AND EXECUTION TIME ............................................................... 8
6. DISASSEMBLY METHOD ................................................................................................................. 9
7. OPERATION OF PICKUP ............................................................................................................... 13
8. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ............................ 14
9. TEST MODE .................................................................................................................................... 37
10. TROUBLESHOOTING ..................................................................................................................... 40
11. BLOCK DIAGRAMS ......................................................................................................................... 54
12. SCHEMATIC DIAGRAMS ................................................................................................................ 62
13. PRINTED WIRING BOARD ASSEMBLIES ..................................................................................... 78
14. REPLACEMENT PARTS LIST ........................................................................................................ 95
15. PACKING OF THE SET ................................................................................................................. 114
SERVICE MANUAL
VCR/DVD COMBINATION MODEL
MODELS DV-NC70/W/X/RU

Sharp DV-NC70 Specifications

General

Video Format	NTSC
Dimensions	17 in x 14.1 in x 3.9 in
Weight	11.5 lbs
DVD Standard	DVD-Video
Remote Control	Yes
Type	DVD VCR Combo
Playback Formats	CD, DVD, VHS
Recording Formats	VHS
Connections	Composite video output, RF input
Media Type	DVD-R, DVD-RW
Outputs	Composite x 1, RF x 1
Inputs	RF x 1

Summary

Important Service Notes

Laser Diode Properties and Safety

Details laser diode specifications and safety precautions.

Power Cord Protection

Guidelines for safe AC power cord handling and usage.

Maintenance Checks and Time

Mechanical Parts Inspection Guide

Pickup Cares and Handling

Disassembly Method

Step-by-Step Disassembly Procedure

Instructions for dismantling the unit.

Pickup Operation

Pickup Circuit Configuration and Equivalent Circuit

Details the pickup's internal circuit and signal flow.

Pickup Signal Polarities

Explains signal polarities for focus and tracking.

Pickup Signal Descriptions

Details signals related to pickup operation.

Mechanical Unit Service Procedures

Mechanism Adjustment Jigs and Tools

Lists special jigs required for mechanism adjustment.

Maintenance Check Items and Execution Time

Disassembly and Reassembly of Mechanism

Procedures for disassembling and reassembling the mechanism.

Reel Disk Replacement and Height Check

Torque Checking and Adjustment Procedures

A/C Head Replacement and Adjustment

Tape Drive Train Adjustment

Drum Motor Replacement

Loading Motor Replacement

Test Mode Operations

Test Mode Entry and Operations

Instructions for accessing and using test modes.

Laser Test Mode Functions

Details specific laser test sequences and their outcomes.

Troubleshooting Guide

VCR Troubleshooting Flowcharts

Step-by-step guide for diagnosing VCR issues.

DVD Troubleshooting Flowcharts

Step-by-step guide for diagnosing DVD issues.

System Block Diagrams

Main Block Diagram

VCR Signal Flow Block Diagram

Power Block Diagram

Schematic Diagrams

DVD Circuit Schematics

Detailed circuit diagrams for the DVD section.

VCR Circuit Schematics

Detailed circuit diagrams for the VCR section.

MPX/Skew Circuit Schematic

Printed Wiring Board Layouts

DVD Main PWB Layouts

VCR Main PWB Layouts

Power PWB Layouts

MPX/Skew PWB Layouts

Parts List and Exploded Views

Electrical Parts List

Printed Wiring Board Assemblies

Mechanism Parts (VCR)

Mechanism Exploded View (DVD)