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Technics SH-8028 Service Manual page 3

Stereo graphic equalizer

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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
eee 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
Mi LOCATION
OF CONTROLS
Equalizer switch
(..- on,
H off)
Recording mode 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"
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.)
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—

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