Technics SH-8028

Mi CONTENTS
Page Page
SAFETY PRECAUTION ....----+ 200 e ee eaee 3 BLOCK ‘DIAGRAM ‘x -6:0 4% 4-24 Si Gi k. O09 we Ae oe 6
LOCATION OF CONTROLS..............4.. 3,4 CIRCUIT BOARDS AND WIRING CONNECTION DIAGRAM. .7,8
OPERATION
bic
fous
be
SES
eee
ot
eee
ears
4
SCHEMATIC
DIAGRAM
...........002
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ener
eeae
9,
10
DISASSEMBLY INSTRUCTIONS ..............- 5 REPLACEMENT PARTS LIST ...........0 cece sees 11,12
RESISTORS and CAPACITORS .............-4- 6 EXPLODED: VIEW ice i.e Se i ew ard SLE 6 BR a 11,12
a3 SAFETY PRECAUTIONS (This “safety precaution” is applied only in U.S.A.)
Before servicing, unplug the power cord to prevent an electric shock.
When replacing parts, use only manufacturer’s recommended components for safety.
Check the condition of the power cord. Replace if wear or damage is evident.
After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to
prevent the customer from being exposed to a shock hazard.
hg ON
INSULATION RESISTANCE TEST
1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3MQ2
and 5.2MQ2 to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to
all exposed parts. (Fig. B)
Note: Some exposed parts may be Isolated from the chassis by design. These will read infinity.
Antenna
terminal
Exposed Exposed
metal metal
part part
Onmmeter Onhmmeter
(Fig. A) (Fig. B)
Resistance = 3M2—5.2MQ Resistance = Approx oo
4.
|f
the
measurement
is
outside
the
specified
limits,
there
is
a
possibility
of
a
shock
hazard.
The
equipment
should
be
repaired
and
rechecked
before
it
is
returned
to
the
customer.
Mi LOCATION OF CONTROLS
16kHz
63Hz
6.3kHz
160Hz
cieet
ai
)
400Hz
|
Right
channel
controls
TkHz
1kHz
band
level
controls
(+12dB)
400Hz
2
5kHz
(+12dB)
160Hz
6.3kHz
One
16kHz
Equalizer switch
(..- on, H off)
Recording mode selector
Power
switch
(=
EQ,
@
straight)
(
=
on,
Hoff)
Input
selector
( m tape, J source)
{_ selector
For [XA] ,[PA] and[PE] areas
AC outlet (Unswitched)
For [M],{[MC] ,[XA] ,[PA] and
[PE] areas
Line input
Line output
Mi OPERATION
ey Input selectors: Select the sound source.
Q Loudness switch: ‘‘off’’ @ ‘‘AV/aux”: To use equipment connected to the
auxiliary input (““AV/AUX’’) terminals.
@ Tape-monitor selector: ‘‘tape 1/DA tape”’ (Refer to note). @ “CD”: To listen to a compact disc.
(The “tape” indicator will be illuminated) ™ ‘tuner’ —To listen to radio broadcasts.
™ “phono”: To listen to phono discs.
6) Balance control: ‘‘center position”
ye CD direct switch: ‘‘off’’
© Tone controls: “center position” To listen to CD direct: “on”
©
Power
switch:
“‘on’-
fm
Volume
control:
“Q—1”
Integrated
amplifier
(option)
® Begin the disc play or tune to the radio
broadcast.
ry) Adjust volume level.
fe) ‘‘on”’ (H_ m)
iE) Adjust tone quality as desired.
This unit
(SH-8028)
12
i
oe
[oyster
Press the equalization switch (equalizer) in to the ‘‘off’’ (=. H) position to listen to uncorrected sound, or when recording.
“tape” (H_. =) Set to any position.
Notes
e Ifthe amplifier has a recording mode selector and an input selector: (Make setting as shown in the figure.)
Lanne
eal
|
//
NY
input
select
SJ
or
tuner
U
|
a0
Ro)
a
or)
oO
OO
ODO
000
0
O
e If your amplifier has terminals (GRAPHIC EQ./EXTERNAL) for connection of other equipment, use of the recording selector is
unnecessary.
on
Mi DISA
Ref. No.
1
Procedure
1
Ref. No.
2
Procedurt
1-2
@ Rer
Ref. No.
3
Procedure
1-2—