Sony ta h 3700 service manual

Page 1

SERVICE MANUAL

This set is the Amplifier
section in MHC-3700.

TA-H37IIII

AEP Model
UK Model

SPECIFICATIONS

Conlinuous RMS power ouipui
For saieiiile speaker:
23 + 23 waits (8 ohms a!
1 kHz. DIN)
28 + 26 wells (3 ohms ai
1 kHz. 5% THDI
For bass speaker:
27 + 27 waiis (6 ohms at
110 HZ. DIN)
32 + 32 wells (6 ohms at
110 Hz, 5% THU)
Music power output
For satellite speaker:
40 + 40 waits (8 ohms el
1 kHz, 10% THD)
For bass speaker:
45 + 45 wells (6 ohms ai
H0 H1, 10% THD)
Onlpuls HEADPHONES
(siereo miniiack):
accepls headphones 0|
8 ohms or more,
SPEAKER (SATELLITE):
accepis speakers oi 8 io
16 ohms.
SPEAKER (BASS):
accepis speaker ol 5 lo
16 ohms,

Design and specifications subject to change
without notice.

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY 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.

INTEGRATED STEREII AMPLIFIER

ONY®

Page 2

TA-H3700

TABLE OF CONTENTS

W M M
MODEL IDENTIFICATION
-Model Number Label- 1. GENERAL
l-L Parts Identification .............................. 2
SONY MODEL N0. TA-H3700 2_ DIS ASSEMBLY
INTEGRATED STEREO AMPLIFIER 21. Front Panel Assy ................................ 3
Wm 22 Jack Board, Speaker Board ...................... 3
ZS. Audio Board, AC Board ...... , .4
2-4. Power Amp Board, Power Transformer .......... 4
3. DIAGRAMS
3-1. Circuit Boards Location .......................... 5
AEP model 1 AC: 220-23°V~50/6°Hz 3-2. Semiconductor Lead Layouts ...................... 6
Italian model : AC: 220-230V~50Hz
Germany model: SYSTEM MHC_3700 3-3. Printed Wiring BoardmAudio Section* .......... 7
AC: 220-23ON50H1 3-4. Schematic DiagramiAudio Section~ ............ 9
UK "°d°' : AC: 24°V~5°HZ 3-5, Schematic Diagram-AC/Volume Section- ...... 13
3-6. Printed Wiring Boards-AC/Volume Section- . . . .17
3~7, Printed Wiring Boards
-Power/ Power Amp Sectionw .................. 19
3-8. Schematic Diagram
-Power/Power Amp Section~ .................. 21
3-9, Schematic Diagram-Panel Section- ............ 24
3-10. Printed Wiring BoardiPanel Sectioni .......... 27
3-11. Pin Functions of IC501 (pPD78134GF-051-3B9) . . . .31
4. EXPLODED VIEW
41. Main Section .................................... 33
5. ELECTRICAL PARTS LIST iiiiiiiiiiiiiiiiiiiiii 34
SECTION 1
G EN ERAL
This section is extracted from
1-1. PARTS IDENTIFICATION "Strum mama'-

WAKE UP VOL SET button and indicator

[3 SYSTEM POWER switch and STANDBY
indicator
The Indicator remains lit as long as the
AC power cord ls connected to a wall
outlet.

E DISPLAY button ®

[3 Display window

IE] VOLUME control m

FUNCTION <> buttons w

T.P.O. button ®

[3 DIRECT button @

TOTAL EFFECT CONTROL -/+ buttons

9
MUSIC button 9
IE] Functlon indicators
[El MUTING button 9
IE] HEADPHONES jack (stereo minijack) @