Technics STHD 51 Service Manual

Page 1

OS

Tuner

*SB-HD51

RS-HD81 SE-HDSI

*SB-HDSI

ORDER NO. AD960208002

ervice Manual

Tuner
Colour
(N) ............ Gold
Areas
(E) ............. Europe.
(EG) ........... Germany and
Italy, etc.

System : SC-HD51

Because of unique lnterconnecting cables, when a compact requires service, J

[ send or bring in the entire system.

Specifications

Pre-amplitier Section

Input sensitivityfimpedance
EXTERNAL: 2.50 mV/15 kohm
Output level
EXTERNAL: 250 mV/t .5 kohm
Frequency response
EXTERNAL: 50 Hz - 25 kHz
SIN
EXTERNAL: DlN 82 dB (83 dB, IHF)

FM tuner Section
Frequency range: 3750 - 108.00 MHz (0.05 MHz steps)
Sensitivity: 1.8 pV (IHF usable)
SIN ZBdB: 1.5 uV
SIN
MONO: 70 dB (75 dB, IHF)
Stereo separation
1 kHz: 35 dB

Antenna terminal(s): 75 ohm (unbalanced)

SystemiSG-Hl351:

AM tuner Section

Frequency range: 522 - 1611 kHz (9 kHz steps)
530 - 1520 kHz (10 kHz steps)
Sensitivity (em 20 dB): 500 uV/m

Timer Section

Clock: Quartz-lock type
Function: 24-hour programmable;
Play timer (1 lime), Rec timer (1 time)
Sleep (120 min., 30 min., intervals)
Setting: 1 minute-23 hours 59 minutes (1 min, intervals)

General
Dimensions: 196(W)/67(H)/235(D) mm
Weight: 1.2 kg

Notes:
1 . Specifications are subject to change without notice.
2. Weight and demensions are approximate.

Tuner: ST-HD51, Compact Disc Player: SL»HD51, Amplifier: SE-HDSi, Cassette Deck: RS-HDEH, Speakers: *SB-HD51

Notes: >x ...... Made in PAES

AWARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. it
does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

Technic§

©1998 Matsushita Electric Industrial 00., Ltd,
All rights reserved. Unauthorized copying and
distribution is a violation of law.

Page 2

ST-HD51 ,

I Contents
Page
Location of Controls .
Setting tne Time
About the Self-Diagnostic Made
Operation Checks and
Main Component Replacement Procedures ..
Type Illustration of le, Transistors and Diodes
To Supply Power Source

Page
Schematic Diagram. 7 ~ 15
Printed Circuit Board Diagram 16 N 19

Block Diagram ....................
Wiring Connection Diagram
Terminal Function of Ice
Replacement Parts List
Cabinet Parts Location

NOTE:
Refer to the service manual for Model No. SE-HD51 (ORDER No. AD980203162) for iniormation on Accessories,
Installation", Connections" and Packaging.

I Location of Controls

1 ® Remote control signal sensor

® Record timer button (0 REC)

® Play timer button (a PLAY)

@ Clock/timer button (CLOCK/TIMER)

(5) Set button (SET)

® Tuning/time adjust buttons (v, A T UNINGrl'lME ADJUST)
(7) Tuning mode select button (TUNING MODE)

Source input Select button (INPUT SELECTOR)

FM band select button (FM)

@ AM band select button (AM)

I Setting the Time

(D Press v or A to select the day.

Every time you press one of the buttons, the indication changes
in the order of SUNzMONZ'HJEZWEDiTHUzFRI:
SAT.

® Press SET.

6) Press v or A to select the hour.
® Press SET.

@Press v or A to select the minutes.
® Press SET to finish setting the time.

The display will retum to the previous display after about 3 sec-
onds.

When "-:-" appears:

It flashes when you connect the AC power supply cord for the first
time or if there has been a power failure.

Reset the time as explained above.

n AF£|:-. r?
, '1 V Lil:- ~__._i

If the minutes setting is off:

1. Press CLOCK/ TIMER.

2. Press SETS times.

3. Press v or A to set the minute, and then press SE11

The tuner displays the time, frequency and other information
on CDs and tapes.

This is a 24-hours display clock.
To display the clock again:
Press CLOCK/TIMER

These instructions explain how to set the inner for 16:25 on _
The clock display will appear for about 8 seconds.

Wednesday.
[I Switch on the power.
a ® Press CLOCK/1' IMER to show CLOCK.

Every time you press the button, the indication changes in the
order of CLOCK-> G REC» ® PLAY->Original display.
Within 8 seconds:

@ Press SET.

For your reference:
When you turn OFF the system from the POWER button, the system
goes on standby and the STANDBY indicator lights up.