Sony ST H3700 Service Manual

Page 1

ST-H3700

sffichMAnuAT WM

Australian Model
Tourist Model

This set is the tuner
section in FH-E757

TABLE OF CONTENTS

Section Title Page
SPECIFICATIONS W -
System FM stem, FM/Mw/sw 1' SERVICING NOTES . _
superheterodyne tuner 1-1l Supply of Power During Servnces ............... 2
F PM" "W 1.2 Service Mode to Check Timer ON-OFF ......... 2
Tuning range 87.5- 108 MHz
Antenna terminals 75 ohm unbalanced 1-3l Serv1ce Mode to Check FL Tube and Key Input ,3
'memed'ae 51":37 MH 1-4l How to Forcefully Turn Power ON ............ 3
. Z
AM tuner sectlon
Tuning range MW: 531-1.602kHz 2. GENERAL ........................................ 4
sw: 3,20-730MH1 . . .
9,50-21.75MH2 Parts Identification ................................. 4
Antenna AM Ioop antenna. Clock Setting ....................................... 4
External antenna terminals Tuning in Automatically .5

intermediate trequency

450 kHz Tuning in Manually .................................. 5
Storing Stations ...................................... 6
Design and specifications subject to change To Tune in a Preset Station """""""""""""" 6
without notice.
3. ELECTRICAL ADJUSTMENTS .................... 7
4. DIAGRAMS
4-1. Block Diagram .................................. 9
4-2. Schematic Diagram -Tuner Section# ............ 13
4-3. Printed Wiring Boards -Tuner Section- ........ 15
4-4. Schematic Diagram *Dlsplay Section~ l .
4-5. Printed Wiring Board ~Display Section- ........ 19
4-6. Pin Description .................................. 21
47 Semiconductor Lead Layouts .................... 22
5. EXPLODED VIEW ................................ 23
6. ELECTRICAL PARTS LIST ...................... 24

FM STEREO/FM-AM TUNER
S ONY;

Page 2

ST-H3700

SECTION 1
SERVICING NOTES

1-1. SUPPLY OF POWER DURING SERVICES

- Frequencies initially preset

MW
Because the equipment is not provided with any power sup» FM 9kHz STEP lOkHz STEP SW
ply, it is operated with power supplied from the amplifier
TA-HZ700 used in the series. The equipment requires the 1 875MHz 531kHZ 530kHZ 3,20MHz
following 4 types of voltages. Therefore, connect the equip- 2 88.0MH2 603kHz 620kHz 3.50MH2
ment to TA~H27OO for services such as repairing with power 3 980MHZ ggngz 1050. 5.00MH2
supplied, because it will be too complicated to supply these 4 100 (MHZ 1404kHz 1490kHz 6 50MH2
voltages individually, ' '
5 108.0MH2 1602kHz l710kHz 7.30MH2
VOLTAGE MAJOR CIRCUIT IN USE 6 950MHz
AC 3.9V FL tube filament voltage (VF) 7 10,00MH2
DC -24V Display controller IC701 grid voltage (VG) 8 *l *2 *2 15.00MHz
DC 56V Display controller IC701, Tuner PLL IC81 9 20.00MH2
Vcc 10 21.75MHz
DC 12V Tuner RF, FM/AM DET Ic21 Vcc 11-20 *1

1-2. SERVICE MODE TO CHECK TIMER ON-OFF

It is possible to check whether the timer normally functions

while being connected with an amplifier.

(1) Connect the equipment to the amplifier TA-HZ700 and
set the SYSTEM POWER switch to STANDBY state,

(2) Set the time of the tuner to any time.

(3) PressB switches BAND, -" and MEMORY/NEXT"
at the same time (while pressing BAND" and -"
beforehand, finally press MEMORY/NEXT)

(4) FL display tube

10: 21

10:22

10:23

10: 24

-» POWER ON

<- (_ <- (-
.0 :3 sD :3
()1 U1 (J1 U!
m m m

(D (D (D g
0 0 O 0

FUNCTION : CD

l 3 sec
-> POWER OFF

(5) Completion

Note : After completion of the checking above, data preset in
the memory IC702 is erased while resetting the mem-
ory to the next page state upon shipping from the
works, so be sure to recover the same frequency as
that before the repairing.

'1 The same frequency values are set for the preset memory

No,6»No.lO, Noll-N015 and No.16-No.20 as for No.1-

No.5 respectively.

*2 The same frequency values are set for the preset menory

NoI6-No.10 as for No.1«No,5.