KENWOOD R-SG7G Service Manual

Cover page of KENWOOD R-SG7G Service Manual

Service Manual for KENWOOD R-SG7G, downloadable as a PDF file.

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STEREO INTEGRATED AMPLIFIER/TUNER
R-SG7/SG7G
SERVICE MANUAL
© 1999-7/B51-5549-00 (K/K) 2299
70%
604
603
614
611
642
640
612
641
613
stereo integrated amplifier/tuner
phones
down
up
volume
control
pure
input selector
N.B./tone
pure
enter
%
band
auto/mono
fi
turning
on/standby
SPEAKER
(6 ­ 16
)
R
L
SUB
WOOFER
PRE OUT
FM75
FM300
GND
AM
ANTENA
SYSTEM
CONTROL
R
L
IN
IN
CD
AUX
REC OUT
PLAY OUT
REC OUT
PLAY OUT
TAPE
MD
SUB panel *
(A22-)
Front glass
(B10-2373-03)
Indicator
(B12-0368-04)
Panel *
(A60-)
AC cord *
(E30-)
Lock terminal board
(E70-0034-05)
Phono jack
(E63-1014-05)
Phono jack
(E63-0136-15)
Phono jack
(E63-0047-15)
Metallic cabinet
(A01-3470-11)
Lock terminal board
(E20-0476-05)
Rectangular receptacle
(E08-0312-05)
AC cord bushing
(J42-0083-05)
Knob
(K29-6741-04)
Indicator
(B12-0320-04)
Knob
(K29-6358-14)
Escutcheon
(B07-2457-03)
Knob
(K29-7570-03)
* Refer to parts list on page 23.
R-SG7(K)COVER1,1P( 99.10.300:17PM y[W 2
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STEREO INTEGRATED AMPLIFIER/TUNER
R-SG7/SG7G
SERVICE MANUAL
© 1999-7/B51-5549-00 (K/K) 2299
70%
604
603
614
611
642
640
612
641
613
stereo integrated amplifier/tuner
phones
down
up
volume
control
pure
input selector
N.B./tone
pure
enter
%
band
auto/mono
fi
turning
on/standby
SPEAKER
(6 ­ 16
)
R
L
SUB
WOOFER
PRE OUT
FM75
FM300
GND
AM
ANTENA
SYSTEM
CONTROL
R
L
IN
IN
CD
AUX
REC OUT
PLAY OUT
REC OUT
PLAY OUT
TAPE
MD
SUB panel *
(A22-)
Front glass
(B10-2373-03)
Indicator
(B12-0368-04)
Panel *
(A60-)
AC cord *
(E30-)
Lock terminal board
(E70-0034-05)
Phono jack
(E63-1014-05)
Phono jack
(E63-0136-15)
Phono jack
(E63-0047-15)
Metallic cabinet
(A01-3470-11)
Lock terminal board
(E20-0476-05)
Rectangular receptacle
(E08-0312-05)
AC cord bushing
(J42-0083-05)
Knob
(K29-6741-04)
Indicator
(B12-0320-04)
Knob
(K29-6358-14)
Escutcheon
(B07-2457-03)
Knob
(K29-7570-03)
* Refer to parts list on page 23.
R-SG7(K)COVER1,1P( 99.10.300:17PM y[W 2
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R-SG7/SG7G
2
CONTENTS / ACCESSORIES
CONTENTS / ACCESSORIES .................................. 2
CIRCUIT DESCRIPTION ............................................3
ADJUSTMENT ............................................................7
PC BOARD ................................................................ 8
SCHEMATIC DIAGRAM .......................................... 11
EXPLODED VIEW ....................................................22
PARTS LIST..............................................................23
SPECIFICATIONS ......................................Back cover
Contents
FM indoor antenna (1)
(T90-0801-15) : M
(T90-0809-05) : ET
DISPLAY
SLEEP
TAPE
REMOTE
CONTROL
UNIT
RC-SE9
1
2
3
RANDOM
4
5
6
CLEAR
7
8
9
P.MODE
O.T.E.
0
+10
EDIT
TUNER BAND
INPUT
N.B.
MUTE
VOLUME CONTROL
MD
CD
P.CALL
Batteries (R6/AA) (2)
AM loop antenna stand (1)
(J19-3645-05)
AM loop antenna (1)
(T90-0833-05)
Audio cords (2)
(E30-0615-05)
System control cord (1)
(E30-2628-05)
AC plug adaptor (1)
(E03-0115-05)
Battery cover (A09-0356-08)
Remote control unit (1)
(A70-1154-05) : M . . . . . . . RC-SE9
(A70-1155-05) : TE . . . . . . . RC-SE9(E)
Accessories
Operation to reset
The microcomputer may fall into malfunction (impos-
sibility to operate, erroneous display, etc.) when the
power cord is unplugged while power is ON or due to
an external factor. In this case, execute the following
procedure to reset the microcomputer and return it
to normal condition.
R-SG7
Pull the power plug from the receptacle, and then plug
it in again while keeping the "on/standby" key pressed.
÷ Please note that resetting the microcomputer clears the
contents stored in it returns it to condition when it left the
factory.
R-SG7(K)COVER1,1P( 99.10.300:17PM y[W 3
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R-SG7/SG7G
3
CIRCUIT DESCRIPTION
1. INITIAL STATE
(1) AMP related block
· POWER ..............................OFF
· SELECTOR SOURCE ........TUNER
· DISPLAY..............................SELECTOR
· N.B.CIRCUIT .......................OFF
· A CLASS VOLUME VALUE
.............................................1.80 STEP
· AB CLASS VOLUME VALUE
.............................................9 STEP
· PURE A MODE....................NORMAL(AB CLASS)
· AUTO POWER SAVE..........OFF
(2) TUNER related block
· BAND ...................................FM
· P.CH MEMORY ...................LAST FREQUENCY
· LAST P.CH ..........................01ch
· RDS DATA TABLE MEMORY
.............................................NO DATA
· RECEIVING FREQUENCY
.............................................LOWER LIMIT
VALUE OF
RECEIVING FREQUNCY
FM : 87.5MHz
AM : 531kHz
· AUTO/MANUAL ...................AUTO
· EON THRUST RECEIVING MODE
.............................................OFF
(3) TIMER related block
· CLOCK ................................STOP(AM12:00)
· PROGR................................WORKIG MODE (OFF)
CONTENTS OF PROGRAM
.........................................ON=AM12:00
OFF=AM12:00
PLAY MODE=PLAY
SELECTOR=TUNER(1ch)
REC MODE=TAPE
· O.T.T....................................WORKING MODE (OFF)
O.T.T.ON TIME...............AM7:00
2. INITIALIZING
2-1 The method of the initializing
The system is initialized when the power is turned on while
pressing the [ON/STANDBY] key.
(1) Contents of the operation
· All the functions are initialized.
3. BACK UP
This function holds the current state of the unit even if the
AC power of the receiver is turned OFF.
(1) Operation outline
The backup state set command(CE) of a microcomputer
is set low when the AC power is turned OFF. The micro-
computer detects the signal and enters the stop state.
The microcomputer is reset when the AC power is turned
ON. The data for backup state comfirmation is checked
by reset processing. The microcomputer is initialized
when the data was destroyed. If it is not destroyed, the
microcomputer is started in the backup state.
· The data for backup state comfirmation is written in a
RAM area.
· The microcomputer is set to the stop mode so as to save
the power consumption.
· A backup state set command signal is detected by a timer
interrupt of 1 msec.
· The backup guarantee period is set in a circuit.
(2) Contents of backup data to be held
··· ··· ··· AMP ··· ··· ···
· POWER ON/OFF
· DISPLAY MODE
· SELECTOR SOURCE
· N.B.CIRCUIT MODE
· A CLASS VOLUME VALUE
· AB CLASS VOLUME VALUE
· PURE A MODE
· AUTO POWER SAVE ON/OFF
··· ··· ··· TUNER ··· ··· ···
· LAST BAND
· PRESET CHANNEL/RECEIVING FREQUNCY/PI/TA/
PTY/PS
· LAST RECEIVING FREQUNCY AND PRESETCHANNEL
(AM/FM)
· PRESET MEMORY DATA(1ch~40ch)
· AUTO/MANUAL
· EON THRUST RECEIVING FREQUNCY
··· ··· ··· CLOCK/TIMER ··· ··· ···
· LAST CLOCK DATA
· PROGRAMMED CONTENTS/PROGRAM TIMER
WORKING MODE ON/OFF
· O.T.T. SETTING TIME/WORKING MODE ON/OFF
4. CONDITIONS ACCORDING TO THE
DESTINATION
4-1 Destination list of tuner
Desti-
nation
Band
Receiving
frequency
range
Channel
space
IF
PLL
reference
frequency
DIODE SW
DSW1 DSW2
(D519) (D518)
FM 87.5MHz~
50kHz
+10.7MHz
25kHz
E1
108.0MHz
0
1
AM
531kHz~
9kHz
+450kHz
9kHz
1602kHz
FM 87.5MHz~
50kHz
+10.7MHz
25kHz
E3
108.0MHz
1
0
(RDS) AM
531kHz~
9kHz
+450kHz
9kHz
1602kHz
M
E1 changes by only setting " DSW1". (DSW1
0,E1)
X
1
*DIODE SW(DSW) : 0
Without diode(when static, input low)
1
With diode(when static, input high)
X
Switching transistor
R-SG7(K)COVER1,1P( 99.10.300:17PM y[W 6
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R-SG7/SG7G
4
CIRCUIT DESCRIPTION
5. TEST MODE
5-1 AMP test mode using main unit's keys
· Entering the AMP test mode
Turn on the power while pressing the[BAND] key.
· Canceling the AMP test mode
By turning off the power, the systen is initialized and the
test mode is canceled.
5-1-1 Contents of AMP test mode
(1) Automatic on/standby ON
· The POWER ON state is entered when the power is
turned on whille pressing the [BAND]key. All functions are
then initialized and activated in the all-lighting mode.
· Sub-clock oscillation diagnosis function
The oscillation diagnosis (existence of oscillation and
measurement of period) of a sub-clock is performed
before the test mode is entered. If the diagnosis result is
OK,the system enters the test mode. If the diagnosis
result is NG,the oscillation of the sub-clock is diagnosed
again. If the result is OK, the system enters the test
mode. If the diagnosis result is continuously NG five
times, the system stops with ERR1 and ERR2 displayed.
(2) All- lighting mode
· All the fluorescent display indicators and LED lamps light
when the power is turned on while pressing the [BAND]
key. After that, all- lighting mode is canceled when any
main unit's key is pressed. The normal display is obtained
when the selector is set to TUNER then appears.
(3) Others
· The AMP test mode is not terminated even if the selector
is set to positions other than TUNER.
· In the AMP tesst mode,the muting during mode selection
is not controlled. However, the operation during the
power-on sequence is the same as the normal operation.
· The SP protection operation is also the same as the nor-
mal operation.
· In the AMP test mode using main unit's keys,the keys
below provide a special operation according to the posi-
tion where the selector is set. The main unit key's except
described below and the rotary encoder provide the nor-
mal operation.
(4) When selector is set toTUNER
1 Write data in the unused area of E2PROM, then read the
written data. If the read data is the same as the written
data, RAM OK is displayed in the fluorescent display indi-
cator. If the former is the different from the later, RAM NG
is displayed.
2 Set the TUNER ATT to OFF and display the S level in
hexadecimal when the [ENTER] key is pressed . (ATT
OFF V V is displayed in the fluorescent display indicator.)
3 Set the TUNER ATT to ON and the display S level in
hexadecimal when the [ENTER] key is pressed. (ATT ON
V V is displayed in the fluorescent display indicator.)
* The special display using the [ENTER] key is continued
until the next operation is carried out. ( V V : S LEVEL)
When keys other then ENTER are pressed in items
1 to
3 above, the TUNER ATT is set to OFF and the normal
display appears. The operation corresponding to the key
that has been pressed performed in this case.
(5) When selector is set to positions other than TUNER.
1 ENTER and PURE A keys.
The master volume level is selected cyclically, while press-
ing the [ENTER] key.
2 AUTO/MONO key.
Selects the mute operation and equalizer cyclically in the
order below for operation display every time this key is
pressed.
*In the operation for except the AUTO key, become pre-
condition equalizer.
*Pre -condition : The equalizer becomes the condition to be
pushed the AUTO key before (include N.B. circuit).
3 BAND and tuning UP/DOWN keys.
Keys
Operation
PURE A
Increase the P.CALL every time this key
is pressed.
N.B./TONE
Decrease the P.CALL every time this key
is pressed.
ENTER
Selects the display cyclically in the order
below every time this key is pressed.
Value of Master
Press the
Press the PURE A key,
volume.
ENTER key. then press the ENTER key.
MAX
86
16.00
MID
40
8.00
MIN
1
0.20
KEY
OPERATION
AUTO/MONO
KEYS
OPERATION
BAND
Every time this key is pressed, all
the displays go off and the normal
display is selected cyclically.
TUNING
UP/DOWN
R-SG7(K)COVER1,1P( 99.10.300:17PM y[W 7
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R-SG7/SG7G
5
CIRCUIT DESCRIPTION
6. Microprocessor : uPD78045FGF071(X09-IC11)
6-1 Microprocessor periphery block diagram
X09,ED1
FL DISPLAY(FIP9GM6R)
RESET
CE
REMOCON
KEY MATRIX
LEVEL IN
CLASS A LED
FL GRID
43
916
BIAS MID
IC11
3
X05,IC2
BIAS HI
PLL IC
LOW RELAY
(LC72131)
HI RELAY
1
SPEAKER RELAY
uPD78045FGF071
X09,IC1
(u-COM)
3
SELECTOR ANALOG
X09,J4
SW CONTROL IC
SERIAL
DATA
(NJU7313AM)
BUSY
X09,IC3
X09,S516
2
E.VOL.IC
VOLUME
(M62421SP)
ROTARY ENCODER
2
ENC-A
SD
ENC-B
STEREO
HEADPHONES
PROTECTION
A MUTE
T MUTE
H.P. MUTE
ATT
A CLASS ON
Key matrix
bsignifies pin number of microprocessor.
KR0
KR1
KR2
KS0
DSW1(D519)
DSW2(D518)
KS1
POWER
AUTO/MONO
BAND
KS2
N.B. CIRCUIT INPUT SEL.
TUNING UP
KS3
pure A
ENTER
TUNING DOWN
59
60
64
63
62
61
58
R-SG7(K)COVER1,1P( 99.10.300:17PM y[W 10

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