Sony ST-H2750 Service Manual

$T-H2750/H3750
SERVICE MANUAL
MHG-3750
US Model
Canadian Model
This set is the tuner
section in MHC-2750/3750
SPECIFICATIONS
FM stereo, AM
superheterodyne tuner
System
FM tuner section
Tuning range 87.5 - 108 MHz
Antenna terminals 75 ohms unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range §30 - 1,710 kHz
(with the AM tuning interval
set at 10 kHz)
§31 -- 1,602 kHz
(with the AM tuning interval
at 9 kHz)
AM loop antenna,
External antenna terminals
Intermediate frequency
450 kHz
Antenna
Design and specifications subject to change
without notice.
Photo is ST-H3750
TABLE OF CONTENTS
Section Title Page
1. SERVICING NOTES
1-1. Supply of Power During Services................ 2
1-2, Service Mode to Check Timer ON-OFF.......... 2
1-3. Service Mode to Check FL Tube and Key Input. .3
1-4. How to Forcefully Turn Power ON ............ 3
2. GENERAL .................. 0.0 cece cece eee eees 4
Parts Identification ......... 0c. c cece cece eee teens 4
Clock Setting ...... 0... cece ec cece tenn e ene 4
Tuning in Automatically ........... 2.0.0. c eee eee 5
Tuning in Manually .......... 0.0... eee ee eee bs)
Storing Stations ...... 6... cece cece eect eee eee eens 6
To Tune in a Preset Station ........... 0.0.0 e cece ees 6
3. ELECTRICAL ADJUSTMENTS .................... 7
4. DIAGRAMS
4-1, Block Diagram .......... 0. ccc cece eee eens 9
4.2. Schematic Diagram -Tuner Section-............ 13
4-3, Printed Wiring Boards Tuner Section- ........ 15
4.4, Schematic Diagram -Display Section- .......... 17
4-5, Printed Wiring Board -Display Section- ........ 19
4-6. Pin Description.... 0.0... 0... ccc cece eee ens 21
4.7, Semiconductor Lead Layouts .................0.. 22
5. EXPLODED VIEW ................ 0. ccc eee 23
6. ELECTRICAL PARTS LIST ...................... 24
FM STEREO/FW-AM TUNER
SONY.