Hitachi DV-W1U specifications Audio Circuit

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3-2. AUDIO CIRCUIT

	NO SOUND
	IS THERE	No
	IS THERE	BREAKDOWN BEFORE IC1201
	AN IMAGE?	BREAKDOWN BEFORE IC1201
	AN IMAGE?

Yes

	ARE IC1501	No	ARE IC1505	No
	pins 8, 9, 15, 20	No		No
	pins 8, 9, 15, 20
	5V?		pin 3 +5V & pin 1 +8V
	Yes		Yes
	Yes
			BREAKDOWN OF IC1506

ARE THERE
SIGNALS AT IC1501					No
pins 1, 2, 3, 5 AND						BREAKDOWN OF IC1201
IC1507 pins 40, 41, 45,
46, 47, 38?
Yes
ARE THERE					No	ARE THERE
ARE THERE						SIGNALS AT IC1501
SIGNALS AT IC1501						SIGNALS AT IC1501
SIGNALS AT IC1501						pins 26,27,28 and
PINS 13, 15 and						pins 26,27,28 and
PINS 13, 15 and						IC1507 pins 34, 35, 36?
IC1507 pins 9-14?						IC1507 pins 34, 35, 36?
Yes							No
Yes							No
IS Q1505					No
BASE VOLTAGE
BASE VOLTAGE
0V?
Yes						BREAKDOWN OF IC1501
Yes
IS Q1505					No

						BREAKDOWN OF Q1505 OR
COLLECTOR						BREAKDOWN OF Q1505 OR
COLLECTOR						Q1506 OR D1504
VOLTAGE						Q1506 OR D1504
VOLTAGE
8V?
Yes
Yes
IS IC1501 pin 21					No
IS IC1501 pin 21					No	BREAKDOWN OF
and IC1507 pin 3-6						BREAKDOWN OF
and IC1507 pin 3-6						IC1501, IC1507
VOLTAGE 5V?						IC1501, IC1507
Yes
Yes
IS Q1507, Q1501					No
IS Q1507, Q1501					No
COLLECTOR						BREAKDOWN OF Q1507, Q1501
VOLTAGE 8V?
Yes
Yes
ARE SIGNALS AT
ARE SIGNALS AT					No	BREAKDOWN OF
IC1507, IC1508,						BREAKDOWN OF
IC1507, IC1508,						IC1507, IC1508, IC1509, IC1510
IC1509, IC1510						IC1507, IC1508, IC1509, IC1510
IC1509, IC1510
pins 7, 8?
Yes

BREAKDOWN OF
Q1305, Q1307-Q1311, Q3503, Q3504

CHECK IC1505 OR +8V LINE ETC.

CHECK IC1101/ IC1601

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Contents DV-W1U Hitachi Sales Corporation Safety PrecautionsValue units used in parts list Contents Chapter General Information CD-R/RWCRD-RA1WO2 UL/CSA/FCCDVD/VCD/CD-DA CVD/SVCD/DVCD CD-R/CD-RW NtscAccessories Troubleshooting Audio Circuit No Sound Are There Signals Breakdown CRD-RA1Check IC1512 and IC1513 REC Standby Track noRecorder Drive Player DriveChapter S a S S E M B L Y Disassembly Procedure Diagrams JAK board and REG board DVD-ROM and DEC board P L O D E D E W Symbol Description Mechanical Parts List Electrical Parts ListElectrolytic 10UF Description Symbol Chip Resistor 56KOHM+-5% 0.1W Transformer DEC DeckCD-R DVD-ROMLCD Display Flhp LCD Display Flhp Schematic DiagramCDR Switch SW-CDR Schematic Diagram PG2201 Rear Jack JAK Schematic DiagramRegulator REG Regulator REG Schematic DiagramDECK-1 DEC DECK-1 DEC Schematic DiagramMpeg Decoder DECK-2 DECDEC Circuit Board SW-CDR Circuit Board Identification of Parts Location SW-DVD Circuit BoardJAK JAK Circuit Board Identification of Parts LocationIdentification of Parts Location IF, REG Circuit BoardsFlhp Flhp Circuit BoardBlock Diagram DV-W1U