DOWNLOAD Sony HT-K250 / STR-VE250 Service Manual ↓ Size: 1.56 MB | Pages: 18 in PDF or view online for FREE

AEP Model

UK Model

E Model

• This set is the Amplifier section in

HT-K250.

This system incorporates Dolby* Digital and Pro
Logic Surround and the DTS** Digital Surround
System.
* Manufactured under license from Dolby

Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.

** “DTS” and “DTS Digital Surround” are registered

trademarks of Digital Theater Systems, Inc.

Power voltage is DC 12V, 5.6V and fed with 
subwoofer (SA-WMSP250) from external 
CONTROL jack.

AUX (Coaxial)

Impedance: 75 ohms
S/N: 90 dB
(A, 20 kHz LPF)

DVD, SAT (Optical)

S/N: 90 dB
(A, 20 kHz LPF)

TV, VIDEO

Sensitivity: 700 mV
Impedance: 50 kohms
S/N: 84 dB
(A, 20 kHz LPF)

Tuning range

87.50 MHz – 108.0 MHz

Antenna terminals

75 ohms, unbalanced

S/N

Mono:

76
70

dB

Stereo:

dB

Sensitivity

Mono:

18.3 dBf, 2.2 

µV/75 ohms

Stereo:

38.3 dBf, 22.5 

µV/75 ohms 

Useable sensitivity

11.2 dBf, 1 

µV/75 ohms

Harmonic distortion at 1 kHz

Mono:

0.3%

Stereo:

0.5%

Separation

45 dB at 1 kHz

Frequency response

30 Hz – 15 kHz, 
+0.5/–2 dB

Selectivity

60 dB at 400 kHz

Tuning range

531 kHz – 1,602 kHz
(With 9-kHz tuning scale)

Antenna

Loop antenna

Usable sensitivity

50 dB/m (at 999 kHz)

S/N

54 dB (at 50 mV/m)

Harmonic distortion

1.0% (50 mV/m, 400 Hz)

Control center:

58 

× 215 × 308

130 

× 233 × 308

 mm

 mm

Control center (with the stand):

Control center:

1.3 kg

Control center (with the stand):

1.4 kg

2003H1678-1

© 2003.08

2

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········································································ 7

3-1. PRINTED WIRING BOARD – MAIN SECTION – ····· 8
3-2. SCHEMATIC DIAGRAM – MAIN SECTION – ·········· 9
3-3. PRINTED WIRING BOARD

– FRONT PANEL SECTION – ············ 10

3-4. SCHEMATIC DIAGRAM

– FRONT PANEL SECTION – ············ 11

3-5. IC PIN FUNCTION DESCRIPTION ··························· 12
3-6. IC BLOCK DIAGRAM ················································ 13

4-1. MAIN SECTION ·························································· 14
4-2. FRONT PANEL SECTION ·········································· 15

····································· 16

When bringing the system in for repairs, be sure to bring in the
entire system (control center (STR-VE250) and subwoofer (SA-
WMSP250) This product is system product, and the entire system
is needed to determine the location requiring repair.

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40

°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350

°C.

Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of soldering iron around 270˚C

during repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

3

This section is extracted
from instruction manual.

Display 1 (17)
DISPLAY POSITION 3 (18)
INPUT SELECTOR 8 (16, 18, 19)
MUTING 5 (16, 30)
Remote sensor 2
SOUND FIELD f/F 9
VOL/PRESET TUNING 4 (19)
VOL/PRESET TUNING control 

7 (16, 19, 27)

?/1 (power) 6

1

2

3

4

5

6

9

8

7

4

A.F.D. wg
AAC BI-LING rf
ALT e; (18, 19, 20, 23)
ANGLE rs
ANT qk
AUDIO rd
AUX wa (16, 25, 31)
AV ?/1 (power) 2 (25)
AV MENU es
CLEAR 8
D.TUNING wh (18)
DISC ea
DISPLAY eh (31)
DVD wd (16, 25, 31)
ENTER/12 7
FM MODE rg (19)
JUMP wl
MAIN MENU ef (22, 26, 27, 28)
MASTER VOL +/– qa (15, 16, 

25, 27)

MEMORY ql (19)
MUTING q; (16, 30)
Numeric buttons w; (18, 19, 20, 

25)

;PL/PLII rh
PRESET/CH/D.SKIP +/– 6 (20)
RETURN O/EXIT ed
SAT 4 (16, 25, 31)
SEARCH MODE ea
SHIFT 7 (19, 20)
SLEEP 1 (23)
SOUND FIELD +/– wj (21, 30)
SUBTITLE wk
SWAP r;
TEST TONE eg (15, 27)
TIME ra
TOP MENU/GUIDE ek
TUNER 5 (16, 18, 19, 20, 25)
TUNING + 8 (18, 19)
TUNING – qk (18, 19)
TV 3 (16, 25)
TV CH +/– qf
TV VOL +/– qg
TV/VIDEO qs
TV ?/1 (power) wf

VIDEO ws (16, 25)
WIDE qd

?/1 (power) 1
V/v/B/b ej (22, 26, 27, 28)
M 8 (24)
m qk (24)
> ql
. el
N qj
X qh
x 9
-/-- ea
0/10 el (25)
>10/11 ql

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