DOWNLOAD Sony STR-DE185 Service Manual ↓ Size: 4.05 MB | Pages: 30 in PDF or view online for FREE

3

Main unit ................................................................................. 4
Remote button description ....................................................... 5

2-1.   Case ..................................................................................... 6
2-2.   Front Panel Section ............................................................. 7
2-3.   Back Panel ........................................................................... 7
2-4.   Main Board ......................................................................... 8

........................................................................ 9

4-1.   IC Pin Description ............................................................. 10
4-2.   Circuit Boards Location .................................................... 11
4-3.   Block Diagram – Main Section – ...................................... 12
4-4.   Block Diagram – Power Section – .................................... 13
4-5.   Printed Wiring Board – Main Section – ............................ 14
4-6.   Printed Wiring Boards – H/P, Outlet Section – ................. 15
4-7.   Schematic Diagram – Main Section (1/2) – ...................... 16
4-8.   Schematic Diagram – Main Section (2/2) – ...................... 17
4-9.   Schematic Diagram – Display Section – ........................... 18
4-10. Printed Wiring Board – Display Section – ........................ 19
4-11. Printed Wiring Board – Power SW Section – ................... 20

5-1.   Case Section ...................................................................... 21
5-2.   Front Panel Section ........................................................... 22
5-3.   Chassis Section ................................................................. 23

......................................... 24

Ω

µF

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.

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 chassis, 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
Simpson 250 and Sanwa SH-63Trd are examples of a passive
VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)

4

This section is extracted
from instruction manual.

GB

Use this page to find the location of buttons that are
mentioned in the text.

r

NAME 5 (18)

R

R

AM 8 (13, 14)
BALANCE L/R q; (12)
BASS +/– wa (12)
BASS BOOST ql (12)
CD qg (8, 12)
DIRECT wg (13)
DISPLAY  qa (12, 16)
Display 9 (11-16, 18, 19)
FM 6 (13, 14)
FM MODE wd (14)

IR (receptor) 2 (4, 22)

SHIFT wh (15)
SLEEP (models of area code U)

4

 (19)

SPEAKERS A wj (10, 12)
SPEAKERS B wk (10, 12)

TREBLE +/– w; (12)
TUNER qh (8, 12-15, 18)
TUNING/CHAR +/– ws (14, 18)
VIDEO 1 qs (12)
VIDEO 2 qd (8, 12)

?/1

 (power) 1 (11, 13, 23)

MASTER VOLUME qj (12, 20)
MD/TAPE qf (8, 12)
MEMORY/ENTER wf (13, 15,

18)

MUTING qk (12, 20)
NAME 5 (18)
Numeric buttons 3 (13)

PHONES wl (12, 21)
PRESET/PTY SELECT +/–

(models of area code CEL,
CEK) 7 (15, 16)

PRESET TUNING +/– (models of

area code U) 7 (15, 23)

PTY (models of area code CEL,

CEK) 4

 

(16)

1

2

3

456

7

8

9q;

qa

qs qd qf qg qh

qj

qk

ql

w;

wa

ws

wd

wf

wg

wh

wj

wk

wl

5

GB

You  can use the remote RM-U185 to operate
the components in your system.

f

F

G

g

?/1

?/1

The tables below show the settings of each
button.

SLEEP

Receiver

Activates the sleep
function and the duration
which the receiver turns
off automatically.

?/1

Receiver

Turns the receiver on or
off.

VIDEO 1

Receiver

To watch VCR.
(VTR mode 3)

VIDEO 2

Receiver

To watch VCR.
(VTR mode 1)

DVD

Receiver

To watch DVD.

MD/TAPE

Receiver

To listen to Minidisc or
audio tape.

CD

Receiver

To listen to compact disc.

TUNER

Receiver

To listen to radio
programs.

SHIFT

Receiver

Press repeatedly to select
a memory page for
presetting radio stations
or tuning to preset
stations.

D.TUNING Receiver

Tuner station direct
key-in-mode.

BALANCE Receiver

Adjust the balance.

L/R

BASS

Receiver

Reinforce the bass.

BOOST

TREBLE

Receiver

Adjust the treble tone

+/–

quality.

MUTING Receiver

Mutes the sound from the
receiver.

BASS +/– Receiver

Adjust the bass tone
quality.

When you press the function buttons (VIDEO 1,
VIDEO 2, DVD), the input mode of the TV might not
switch to the  corresponding input mode that you
want. In this case, press the TV/VIDEO button to
switch the input mode of the TV.

X

x

N

m

M

.

>

O

6

Note : This set can be disassemble according to the following sequence.

2-1.

CASE
(Page 6)

2-2.

FRONT PANEL SECTION
(Page 7)

2-3.

BACK PANEL
(Page 7)

SET

2-4.

MAIN BOARD
(Page 8)

Note : Follow the disassembly procedure in the numerical order given.

1

two screws
(case 3 TP2)

2

two screws
(case 3 TP2)

3

two screws
(case 3 TP2)

4

case