STR-DH740 - Sony Audio Service Manual (repair manual). Page 2

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE  
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN 
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS  
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS  
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR 
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES 
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE 
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS 
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT 
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉ-
MENTS PUBLIÉS PAR SONY.

FM tuner section
Tuning range 

87.5 MHz – 108.0 MHz

Antenna (aerial) 

FM wire antenna (aerial)

Antenna (aerial) terminals 
   

75 ohms, unbalanced

AM tuner section
Tuning range

10 kHz step  9 kHz step

US, CND, MX

530 kHz –  531 kHz –
1,710 kHz  1,710 kHz

AEP, AUS, TW

– 

531 kHz –

 1,602 

kHz

Antenna (aerial) 

Loop antenna (aerial)

Video section
Inputs/Outputs
  Video: 

1 Vp-p, 75 ohms

iPod/iPhone section
DC 5V 1.0 A MAX

USB section
Supported format* 

MP3 (MPEG 1 Audio Layer-3):
32 kbps – 320 kbps, VBR
WMA: 48 kbps – 192 kbps
AAC: 48 kbps – 320 kbps

   

WAV: 8 kHz – 48 kHz 16 bit PCM
*Compatibility with all encoding/writing software,

   

recording devices and recording media cannot be

  

guaranteed.

Transfer speed 

Full-speed

Supported USB device
 

Mass Storage Class

Maximum current 

500 mA

General
Power requirements

US, CND, TW

120 V AC, 60 Hz

MX

127 V AC, 60 Hz

AEP, AUS

230 V AC, 50/60 Hz

Power consumption  240 W
Power consumption (during standby mode)

0.3 W (When “Control for HDMI” and “Pass 
Through” are set to “Off”.)

Dimensions (width/height/depth) (Approx.)

430 mm × 156 mm × 329.4 mm (17 in × 6 

1/4

 in × 

13 in) including projecting parts and controls

Mass (Approx.) 

8.0 kg (17 lb 11 oz)

Design and specifi cations are subject to change without notice.

Supplied accessories
• Operating 

Instructions

• 

Quick Setup Guide (1)

• 

Remote control (RM-AAU168) (1)

• 

R6 (size AA) batteries (2)

• 

FM wire antenna (aerial) (1)

• 

AM loop antenna (aerial) (1)

• 

Optimizer microphone (ECM-AC2) (1)

• Abbreviation

AUS : Australian model
CND  : Canadian model
MX  : Mexican model
TW  : Taiwan model

SAFETY CHECK-OUT (US MODEL)
After correcting the original service problem, perform the following safety 
check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws, and 
all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and from 
all exposed metal parts to any exposed metal part having a return to chas-
sis, must not exceed 0.5 mA (500 microamperes.). Leakage current can be 
measured by any one of three methods.
1.  A commercial leakage tester, such as the Simpson 229 or RCA WT-

540A. Follow the manufacturers’ instructions to use these instruments.

2.  A battery-operated AC milliammeter. The Data Precision 245 digital 

multimeter is suitable for this job.

3.  Measuring the voltage drop across a resistor by means of a VOM or 

battery-operated AC voltmeter. The “limit” indication is 0.75 V, so 
analog meters must have an accurate low-voltage scale. The Simp-
son 250 and Sanwa SH-63Trd are examples of a passive VOM that 
is suitable. Nearly all battery operated digital multimeters that have a 
2 V AC range are suitable. (See Fig. A)

Ω

μF