Sony ST D905 Service Manual

Page 1

SERVICE MANUAL

This set is FM stereo/FM-AM.
Tuner section in LBT-DQOSCD.

ST-DQII5

AEP Model
UK Model

SPECIFICATIONS

System

FM tuner section
Tuning range
Anlenna
Intermediate frequency
MW/LW tuner section
Tuning range

Antenna

Intermediale frequency
Power requiremenls

Power consumption
AC outlet

Weight

Dimensions

FM stereo

FM/AM superheterodyne tuner

87.5 to 108 MHZ
75 ohms unbalanced
10.7 MHz

MW: 531 I0 1,602 kHz
LW: 153 I0 279 kHz

AM loop antenna
External antenna terminal
450 kHz

240 V AC, 50/60 Hz (UK model)
220-230V AC. 50/60Hz (other model)

10 W
2 swilched, total 450 W max.
Approx. 2.6 kg

Approx. 355 X 82.5 X 325 mm
(w/h/d, including projections)

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BV MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL T0 SAFE

OPERATION.

REPLACE THESE COMPONENTS WITH

SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

FM STEREO/FM-AM TUNER
SONY;

Page 2

ST-D905

SECTION 1
SERVICING NOTES
Note on Ceramic Filter (CF1,2,3) A Replacement. O : Mounted
>< :not Mounted
ThIs set employs three ceramic fIlters (CF1,2,3) A which Ceramic filter Mount , FM
should have the same color markmg to identify their center Inlermedlate
frequency. Therefore FM IF offset adjustment by >I< D609, 610 C0101 Center 9' * * frail/1111:?
is necessary to match the center frequency of the mark quency (MHZ) D609 D610 Z
ceramic filters used with FM intermediate frequency. White 10750 O X 10750
Red 10,700 X X 10.700
Black 10,650 X 0 10.650

cola! Ina/king
FM intermediate frequency is determined by the three

types as shown above, Ceramic filters of same center (rc-
quency,i.e.. of same color coding should be used for CH, CFZ,
((31.2.3) A and CF3.
When replacing the ceramic filters. perform the FM DiA
scriminator Adjustment.

A: AEP, UK Model: CFl. 2
G. 1'1 Model: CFI. 2,3

MODEL IDENTIFICATION
-Soecification Label-

SONYo MODEL N0. ST-DQOS

FM STEREO/FM~AM TIMER TUNER

AEP Germany,
Italian Model: AC: 220- 230V~50/60H2
UK Model . AC . 240V~50/60Hz

SERIAL N0,
MADE IN JAPAN

LOCATION OF CONTROLS

EILTJ [El El
i

Remote sensor
Display window

SYSTEM POWER switch
Buttons for storing station frequencies

BAND selector

E] SCAN button

TUNING control

DIMMER button

:1

WE

IE] FREQUENCY/TIME button

AUTO TUNING button

Buttons for setting the clock and timer
SLEEP button