Panasonic SU-CH7 User manual

ORDER NO. AD9104082C8
Service
Manual
Amplifier
enact
Because of unique interconnecting cables,
when a component requires service, send or
bring in the entire system.
m@ SPECIFICATIONS
(DIN 45 500)
@ MAIN AMP. SECTION
Power output DIN 1 KHz THD 1% 60. 2x25 W
10 kHz THD 1% 80 2x5 W
both channel driven at 240 V
Total harmonic distortion
half power at 1 kHz: Low Amp 0.09% (6Q)
Headphones output level/impedance 300 mV/330Q
m@ PREAMP. SECTION
input sensitivity/impedance
PHONO 3 mV/47 kQ
MIC 0.7 mV/10 kQ
DAT 250 mV/27 kQ
S/N (rated power, 6Q): Low Amp
PHONO 70 dB (IHF. A 75 dB)
DAT,
CD,
TAPE
84
dB
(IHF.
A
85
dB)
Graphic equalizer control
80 Hz, 250 Hz, 1 kHz, 4 kHz, 12.5 kHz
Muting
—20
dB
Super
bass
55
Hz,
+44B
Output
voltage/impedance
DAT
REC
OUT
150
mV
(E) (EB) (EG) (GC) (GN)
CD Player
System [Tuner | Amplifier |
SC-CH7
ST-CH7L
SU-CH7
SL-CH7
Technics/Panasonic |
Amplifier
Color
(K) ceviv cee. Black Type
Continental Europe.
Great Britain.
F.R. Germany and Italy.
Asia, Latin America,
Middle Near East and
Africa.
(GN) Oceania.
System: SC-CH7
m@ GENERAL
Power consumption 250 W
Power supply
For Great Britain and Oceania AC 50/60 Hz,.230~240 V
For F.R. Germany, Italy and Continental Europe
AC 50/60 Hz, 230 V
For others AC 50/60 Hz, 110 V~127 V/220 V~240 V
Dimensions (WxHxD) 215 110x303 mm
(815/42"X 41 Yo” 1115/16")
Weight 43 kg (9.3 Ib.)
Notes:
1. Total harmonic distortion is measured by the digital spectrum
analyzer.
2. Specifications are subject to change without notice.
3. Weight and dimensions shown are approximate.
Cassette Deck Speacers
RS-CH7 SB-¢ H7

SU-CH7
m@ CONTENTS
Page : Page
BEFORE REPAIR... 2... cee eee e een eee 2 SCHEMATIC DIAGRAM ........0 0.0 cece ence eee 13~19
PROTECTION CIRCUITRY 2.0.0... . ccc eee cece ence ee 2 PRINTED CIRCUIT BOARDS. ............ 0.0.0 cece eee 20~24
ACCESSORIES? «5.2 sev.ccntsueSing euip ance Weeks Mey eae as eles 2 WIRING CONNECTION DIAGRAM ............. 00.00 e cues 25
HOW TO INSTALL THE SYSTEM.............00.0 0c cece ees 3 FUNCTIONS OF IC TERMINALS ......... 0.00. c es ce eee sees 26
CONNECTIONS ....... 0. cece ence cece ene ene 4,5 BLOCK DIAGRAM ......... cece cece cents 27~29
LOCATION OF CONTROLS ...... 00.00 cee eee eee 6,7 REPLACEMENT PARTS LIST .......... 00.00 cee e eee 30~36
DISASSEMBLY INSTRUCTIONS ............... 0... eee ee 8~11 CABINET PARTS LOCATION ..............00.0 cece eae 37, 38
DESCRIPTION OF FLPANEL ...............2. ccc cence 12 PACKING (For System: SC-CH7)............. 0.00 e cece vues 39
m@ BEFORE REPAIR
(1) Turn off the power supply. Using a 10Q, 5 W resistor connect both ends of power supply capacitors (C703, C704) in order to
discharge the voltage.
(2) Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply
voltage controller to make sure that the consumed current at 50 Hz/60 Hz in NO SIGNAL mode should be shown below with
respect to supply voltage 110 V~127 V/220 V~240 V.
Consumedcurrent50H2 | ——— 85~255 mA
x PROTECTION CIRCUITRY
The protection circuitry may have operated if either of the following conditions is noticed:
“No sound is heard when the power is switched ON.
“Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of this unit are used.
If this occurs, follow the procedure outlined below: :
1. Switch OFF the power.
2. Determine the cause of the problem and correct it.
3. Switch ON the power once again.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first switched OFF and then ON again.
m ACCESSORIES
Speaker cords (2)
<REC201B500-1>
@AC power supply cords (1)
<SFDACO5E03>
for (E, EG) area
<SJA193> for (EB) area
<RJA0004> for (GC) area
<SJA173> for (GN) area
Remote control batteries (2)
(UM-4, “AAA”, R03)
@FM indoor antenna (1)
<SSA270M>
for (E, EB, EG) area
<SSA272M> for (GC, GN) area
©)
eAttachment plug (1)
<SJP9009> for (EB) area
Remote control transmite r (1)
<RAK-SC510W>
for (E, EB, EG) area
<RAK-SC511W>
for (GC, GN) area

SU-CH7
@Flat cables (2) Back cover (4) @LW/MW loop antenna (1)
and Antenna holder (1)
7 and mounting screws (2)
sp <RYFO122-K>
——SSY] for CD player
Blue
(REX9162)
ay <RYFOI22K>
SS
for
tuner
<SPB1163T>
Black
(REX9163) SLD <RKF0127D- K2>
for amplifier
<SMA233-1M>
fs <RKF0127E-K2> ey
SS
¥
—
for
cassette
deck
<XTN3+10AFZ>
“
Installing the components vertically
Left speaker Right speaker
SB-CH7 Compact disc SB-CH7
player So
‘2] SL-CH7
Tuner
eS? ___ 900} ST-CH7L
Amplifier
SU-CH7
Cassette deck
RS-CH7
J@o
Compact disc
Tuner player
ST-CH7L SL-CH7
°
900
t=
es
°
——~
5}
C)
Ca
OS
o
=0
==]
ane UES CYT. eee aeme omen FW
a - -2
Amplifier Cassette deck
SU-CH7 RS-CH7
Installing the components on a line
Amplifier Tuner Cassette deck;
SU-CH7 ST-CH7L RS-CH7
Compact disc player
SL-CH7
pean ee
;
;
F
:
i
;
3

SUCH
m CONNECTIONS
Flat cables
After connection, please fold and press the cables as flat to the
back of the unit as possible.
From the amplifier to the cassette deck
Connecting
Hold the connector with the
recessed part up and press Power switch is located on the rear panel.
in at the center until you hear Pa) Make sure that the power switch on the back of the
a click. 4 amplifier is switched ON.
The white line should be on
the right side.
Disconnecting
When installing the back cover, put this flat cable out of the back cover.

Speaker cables
Other
types
of
speaker
cannot
be
connected
to
this
unit.
Match
the
four
wires
from
the
left
and
right
speaker
cables
with
the
same
colored
levers
of
the
speaker
terminales,
then
insert
the
wires
into
the
respective
terminals.
@ Twist the wire.
@ Push down on the lever, insert the bare ends of the wires, and
push up the lever. (Refer to the right)
Note:
¢Make sure the bare ends of the wires are not unraveled. (If they
are, twist them tight again.)
fx fc
eTake
care
not
to
short
the
wires.
(The
main
unit
could
be
damaged if they are shorted.)
Speaker
First connect the cables to the speakers, then to the
amplifier.
Speaker cable
(included)
Speaker Amplifier
Notice for speaker connections:
Connect each color coded wire of the speaker cable to the
corresponding color coded terminal according to the following
chart.
Polarity l
High tone |
[Lowtone || Black
External
unit
connection
:
@ DAT (digital audio tape deck)
DAT
INPUT OUTPUT
Stereo
pin cord
Amplifier
[
REC OUT
PLAY BACK
et ee
@ PHONO (turntable system)
Turntabl
OUTPUT seein
Stereo ————_. i
pin cord
Amplifier
B “GND” terminal
This terminal is for use with turntables which have a ground wire.

SU-CH7
m LOCATION OF CONTROLS
Amplifier: control section
@
@
@
oe © © ®
©
Sound effect level control (SOUND JOG)
This control is used for adjusting the ievel of the ambience
enhancement effect and the equalization level.
Ambience enhancement button (SPACE)
This button is used to activate ambience enhancement mode.
Spectrum mode-select/demonstration button
(-SPECTRUM MODE-—-DEMO)
This button is used to select one of the six spectrum curves. If
you press and hold this button, six types of sound effects
(spectrum curve in combination with ambience enhancement)
will be sequentially changed (Demonstration mode).
Super bass indicator
\lluminates when the super bass mode is activated.
Super bass button (SUPER BASS)
When this button is pressed, the dynamic low frequency
ranges are boosted.
Volume preset button (VOL. PRESET)
This button is used to make a volume presetting.
Volume level control (VOLUME)
This contro! is used to adjust the volume-leve! (-82 dB~
0 dB). Note that —82 dB is the lowest volume setting and 0 dB
is the highest level setting.
Equalization function button (ON/FLAT)
This button is used to switch the equalization correction
function. If no equalization correction is desired, press this
button again to cancel the function.
(Q) Headphones jack (PHONES)
Microphone jack (MIC)
@) Equalization mode-select/recail button
(-MODE—RECALL)
This button is used to retrieve a pre-programmed equalization
curve from the memory. If you press and hold this button, a
curve you programmed can be retrieved.
Input selectors and indicators
These selectors are used to select the sound source to be
heard. When the sound source is selected, the indicator
above the selector will illuminate.
Standby indicator (STANDBY)
This indicator illuminates when the power “STANDBY.() /ON"
switch of the unit or that of the remote control is switched
“OFF”. Its purpose is to alert the user of the constant supply
voltage to the internal circuitry even with the power switch
OFF.
For this unit, even if this switch is switched to the “STANDBY”
position, there is still a slight power consumption of about
17 watts: this is in order to retain of the “most recent” memory
and the preset-memory functions.

EQ suSERT-
HEAVY » CLEAR
»SOFT »vocat|i*
mHPST & CAR ST 7
2S50Hz
thHz
SU-CH7
ARGE
=== MAX
4kHz 12.5kHz
Amplifier: display section
(@ Ambience enhancement mode indicator
(SPACE)
llluminates when the ambience enhancement mode is acti-
vated.
(6) Spectrum analysis display
This display shows the spectrum analysis level.
(©) Level meter
Display the volume level as it is being adjusted by the volume
control. When adjusting the level of the ambience enhance-
ment effect with the sound effect level control, the display
shows the level of the ambience enhancement effect.
(@ Ambience enhancement adjustment indicator
(SPACE)
\lluminates when adjusting the level of the ambience en-
hancement effect.
©) CD edit indicator (EDIT)
\lluminates when making an edit-recording of a compact disc.
(f) Volume level display
Displays the volume level.
@) Sound effect indicator (¥Y SOUND JOG A)
When “¥” illuminates, it shows the equalization curves can
be adjusted, and when “A” illuminates, it shows that the
ambience enhancement effect can be adjusted.
(h) Equalization mode indicators
(HEAVY-CAR ST)
These indicators show which of the six equalization curves is
currently used.
@ “USER” indicator (USER)
This indicator illuminates to show that the desiredequalization
curves can be programmed into memory or retrieved from the
memory.
@ Volume indicator (VOL.)
illuminates when adjusting the volume level.
(K) Muting indicator (MUTING)
Hluminates when the muting mode is activated.

_ SU-CH7
m@ DISASSEMBLY INSTRUCTIONS
“ATTENTION SERVICER”
Some chassis components may have sharp edges. Be careful when disassembling and servicing.
Removal of the Cabinet i Removal of the Volume/Filter P.C.B.
Procedure
Procedure
o
1
Cabinet
5
S
Volume/Filter
1. Remove 2 screws (@, @).
2. Remove the front panel in the direction of arrow.
2. Remove the 2 screws (@, @).
1. Remove 2 flat cables (CN204, CN501). 3. Remove the front panel in the direction of arrow.
seas Removal of the FL P.C.B. Sound ipa kon
Procedure
1523-4
Volume Knob
. Remove the volume knob and nut.
. Remove the sound jog knob and nut.
. Remove3 screws (Q@~®).
. Removethe P.C.B. in the direction of arrow, making sure not to
damage the connectors (CP604, CP605, CP606).
RON

| SU-CH7
: Ref. No. Removal of the Microphone/
ae Removal of the Operation P.C.B. Headphone Jack P.C.B.
Procedure Procedure
: 1-23-45 152-346
Operation P.C.B.
Holder
Microphone/
Headphone Jack
P.C.B.
1. Remove the screw (@).
:
1.
Remove
3
screws
(@~®).
2.
Remove
the
holder.
2.
Remove
4
claws.
3.
Remove
the
P.C.B
in
the
direction
of
arrow.
|
;
Ref.
No.
Ref.
No.
Removal
of
the
Input-Output
Removal
of
the
Rear Panel
terminal
P.C.B.
Procedure
;
Procedure
157
12-37-58
Rear
Panel
Input—Output
terminal P.C.B.
1. Remove 10 screws (@~@).
2. Remove the connector (CP902).
3.
Remove
the
rear
panel
in
the
direction
of
arrow.
Remove
the
P.C.B.
in
the
direction
of
arrow.
es
es
Removal
of
the
TP.
P.C.B.
Bis
Removal
of
the
Main
P.C.B.
Procedure
Procedure
1-2>3—
7->8—9-—10
1>2—-3—
1. Remove the flat cable (CN701).
2. Remove 5 screws (@~@).
1. Remove the screw (@).
2. Remove the P.C.B. in the direction of arrow.

. SU-CH7
Procedure
1-2>3—
7-8-9 10
Power
IC
PZ,
(Woofer)
Re
oN
ar
ay
Power
transformer
Power !C
(Tweeter)
Regulator transistor
1. Unsolder the power IC.
2. Remove 4 screws (@~@).
eWhen mounting the power IC or regulafor transistor. Apply
silicone compound (SZZOL155) to the rear side of power IC or .* Remove the flat cable (CN701).
regulator transistor. 2. Remove the 4 screws (@~@).
as
Removal
of
the
Fan
Motor
. Remove the motor cover (shown in Fig. 3).
. Remove the motor from the fan casing (shown in Fig. 4).
. When mounting the motor fan. align the fan casings
Procedure : ;
157513
progection
with
the
hole
of
the
fan
motor
(shown
in
Fig.
5).
oh Ww
1. Release the 3 claws (shown in Fig. 1).
2. Insert a screwdriver at the root of the cooling fan.
FanMotor Rear Panel
be
Removal
of
AC
Inlet
P.C.B.
Procedure
114
1. Remove the screw (@).
2. Remove 2 claws.
AC Inlet P.C.B.
—10—