Sony ST H300 Service Manual

Page 2

ST-H3OO

MODEL IDENTIFICATION
-Model Number Label-

SONYo MODEL N0 ST-H300

FM STEREO/FM-AM TUNER

AEP, UK, Model : (AE)
West Germany (WG) Model: (A54)
Itarian (IT) Model : (IT)

0 Power supply for service
Since this machine has no power source in itself, the power is supplied form AMP TA-H300 used for this series.
As shown in the following table, this machine requires 4types of voltage, and supplying each type of voltage
separately makes complicated connections,
Accordingly, make connection with TA-H300 at time of service, such as electrifying repair.
AC 3.9V FL-tube filament voltage
DC -24V Display controller IC701, grid voltage
DC 5V Display controller IC701, Vcc
DC 13V PLL control voltage
0 Service mode for checking the timer ON/OFF
1) Connect with AMP TAFH300 and set the power switch of TA-HSOO to the state of STANDBY.
2) Set the time of tuner to a proper time (any time).
3) Press 3 switches simultaneously, namely, TUNING A , SHIFT and ENTER.
4) FL-tube display

All lamps lighting

1 1 sec.

t 05 sec.

10:24

L 0.5 sec.
l 3 sec.

-»FFWFFFF

5) End