Sony ST H6700 Service Manual

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stivaMANuTL-

ST-HBIUU

E Model
Austral/an Model
Tourist Model

This set is the tuner
section in FH-E858

SPECIFICATIONS

System FM stew. FM/MW/SW
superheterodyne tuner
FM tuner sectlon
Tuning range 87.5 - 103 MHz
Antenna terminals 75 ohm unbalanced
Intermediate frequency
10.7 MHz
AM tuner sectlon
Tuning range MW: 531-1,602kHz
SW: 3.20-7.3OMH2
9.50-21.75MHZ
Antenna AM loop antenna,
External antenna terminals
Intermediate Ivequency
450 kHz

Design and specifications subject to change
without notice.

TABLE OF CONTENTS
Section w Egg

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 ........................................ 4
Parts Identification .................................. 4
Clock Setting ........................................ 4
Tuning in Automatically .............................. 5
Tuning in Manually ..... . r5
Storing Stations .......................... r . 6
To Tune in a Preset Station .......................... 6
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 -Disp1ay Section- r .,17
4-5 Printed Wiring Board *Display SectionA . 19
4-6. Pin Description .................................. 21
4-7. Semiconductor Lead Layouts .................... 22
5. EXPLODED VIEW ................................ 23
6. ELECTRICAL PARTS LIST ...................... 24

FM STEREO/FM-AM TUNER
S 0 NE

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ST-H6700

SECTION 1
SERVICING NOTES
1-1. SUPPLY OF POWER DURING SERVICES Frequencies initially preset
~ ~ ~ ~ FM MW SW
Because the equipment is not provrded wrth any power sup- QkHz STEP lOkHz STEP
ply, it is operated wrth power supplied from the amplifier
TA-H4700 used in the series. The equipment requires the 1 87,5MHz 531kHZ 530kHZ 320MHz
following 4 types of voltages. Therefore, connect the equip- 2 88.0MHz 603kHz 620kHz 3.50MH2
ment to TA-H4700 for services such as repairing with power 3 98.0MH2 gggkflz lOSOkHz 5.00MHZ
supplied, because it Will be too complicated to supply these 4 100.0MHz l404kHz 1490kHz 6.50MHz
voltages 1nd1v1dually.
5 108.0MHz 1602kHz 1710kHz 7.30MHz
VOLTAGE MAJOR CIRCUIT IN USE 6 9.50MHz
AC 3.9V FL tube filament voltage (VF) 7 10.00MHz
DC -24V Display controller IC701 grid voltage (VG) 8 '1 *2 *2 15.00MH2
DC 5.6V Display controller IC701, Tuner PLL IC81 9 20.00MH2
V00 10 21.75MHZ
DC 12v Tuner RF, FM/AM DET Ic21 Vcc 11-20 *1
*1 The same frequency values are set for the preset memory
1-2. SERVICE MODE TO CHECK TIMER ON-OFF No.6»No.10, Noll-No.15 and No.16-No.20 as for No.1-
No,5 respectively.
It is possible to check whether the timer normally functions *2 The same frequencv values are set for the preset menory
while being connected with an amplifier. No.6-No.10 as for No,1-No.5.

(1) Connect the equipment to the amplifier TA-H4700 and
set the SYSTEM POWER switch to STANDBY state.

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

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

(4) FL display tube

10: 21
l 0.5 sec
10 : 22
l 0.5 sec
10: 23
l 0.5 sec
10: 24
i 0.5 sec
FUNCTION: CD

l3sec

-> POWER ON

-> POWER OFF

(5) Completion

Note : After completion of the checking above, data preset in
the memory 1C702 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.