Hitachi DV-W1U 1 - 5, 3-2. AUDIO CIRCUIT

1 - 5

IS THERE

AN IMAGE?

Yes

BREAKDOWN BEFORE IC1201

CHECK IC1505 OR +8V LINE ETC.

CHECK IC1101/ IC1601

BREAKDOWN OF Q1505 OR

Q1506 OR D1504

BREAKDOWN OF

IC1501, IC1507

ARE IC1501

pins 8, 9, 15, 20

5V?

ARE THERE

SIGNALS AT IC1501

PINS 13, 15 and

IC1507 pins 9-14?

IS Q1505

BASE VOLTAGE

0V?

IS Q1505

COLLECTOR

VOLTAGE

8V?

IS IC1501 pin 21

and IC1507 pin 3-6

VOLTAGE 5V?

Yes

ARE THERE

SIGNALS AT IC1501

pins 1, 2, 3, 5 AND

IC1507 pins 40, 41, 45,

46, 47, 38?

NO SOUND

IS Q1507, Q1501

COLLECTOR

VOLTAGE 8V?

Yes

ARE SIGNALS AT

IC1507, IC1508,

IC1509, IC1510

pins 7, 8?

Yes

BREAKDOWN OF

Q1305, Q1307-Q1311, Q3503, Q3504

BREAKDOWN OF IC1201

BREAKDOWN OF IC1506

Yes

ARE IC1505

pin 3 +5V & pin 1 +8V

ARE THERE

SIGNALS AT IC1501

pins 26,27,28 and

IC1507 pins 34, 35, 36?

BREAKDOWN OF IC1501

BREAKDOWN OF Q1507, Q1501

BREAKDOWN OF

IC1507, IC1508, IC1509, IC1510

3-2. AUDIO CIRCUIT

Contents

Main NOTICE: Leakage Current Cold Check Leakage Current Hot Check SAFETY PRECAUTIONS AC Leakage Test PRODUCT SAFETY NOTICE Notes When Using Service Manual The following shows the contents to be noted when using service manual: 1. Value units used in parts list Parts Resistor Capacitor Coil 2. Values in schematic diagrams CONTENTS CHAPTER 1 1 - 1 GENERAL INFORMATION 1. Specifications 1 - 2 2. Comparison with Previous Model 1 - 3 1 - 4 3. Troubleshooting 3-1. VIDEO CIRCUIT 1 - 5 3-2. AUDIO CIRCUIT 1 - 6 3-3. RECORDER AUDIO CIRCUIT 1 - 7 4. Instructions on Use FRONT FRONT <Display> 1 - 8 Audio output jacks Coaxial digital audio output jack Video output jack S-video output connector CHAPTER 2 2 - 1 2. Disassembly Method Parts Hierarchy Chart 1. Before Starting Disassembly 2 - 2 Fig. 2-1 REAR PANEL Disassembly Procedure Diagrams 2-1 Side cover (L), (R) and Top cover 2 - 3 2-3 JAK board and REG board Fig. 2-3 2-4 Front cover, IF, FLHP, SW-DVD and SW-CDR board Fig. 2-4 2 - 4 2-5 DVD-ROM and DEC board Fig. 2-5 2-6 CD-R and Bottom cover Fig. 2-6 1. CABINET SECTION CHAPTER 3 EXPLODED VIEW 1. MECHANICAL PARTS LIST 4 - 1 CHAPTER 4 REPLACEMENT PARTS LIST 2. ELECTRICAL PARTS LIST 4 - 2 4 - 3 4 - 4 CHAPTER 5 SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAM 5 - 4 5 - 3 LCD DISPLAY [FLHP] SCHEMATIC DIAGRAM LCD DISPLAY [FLHP] 5 - 6 DVD SWITCH, CDR SWITCH 5 - 5 DVD SWITCH [SW-DVD] SCHEMATIC DIAGRAM INTERFACE [IF] SCHEMATIC DIAGRAM INTERFACE [IF] CDR SWITCH [SW-CDR] DVD SWITCH [SW-DVD] CDR SWITCH [SW-CDR] SCHEMATIC DIAGRAM REAR JACK [JAK] SCHEMATIC DIAGRAM REAR JACK [JAK] To DECK-2 [DEC] PG2201 To CD-R CN502/CN801 J1306 REGULATOR [REG] SCHEMATIC DIAGRAM REGULATOR [REG] 465 7 8 DECK-1 5 - 12 DECK-1 [DEC] SCHEMATIC DIAGRAM INVERTER DECK-1 [DEC] To REAR JACK [JAK] PG1301 To DECK-2 1A-33A DECK-2 [DEC] 8A F BUFFER MPEG DECODER DEC CIRCUIT BOARD 6 - 18 6 - 17 [PATTERN No.JA1755-4] DEC [DECK] -SIDE A- DV-WIU IDENTIFICATION OF PARTS LOCATION SW-DVD CIRCUIT BOARD SW-DVD, SW-CDR SW-DVD [DVD SWITCH] RA X JAK CIRCUIT BOARD IDENTIFICATION OF PARTS LOCATION JAK [REAR JACK] -SIDE A- JAK [REAR JACK] -SIDE B- BL J IF, REG CIRCUIT BOARDS IDENTIFICATION OF PARTS LOCATION IF REG BL ER F FLHP CIRCUIT BOARD IDENTIFICATION OF PARTS LOCATION DE AB C 1 1 DE BLOCK DIAGRAM