Kenwood SE-7, SE-7-G Service manual

STEREO INTEGRATED AMPLIFIER/TUNER

stereo integrated amplifier/tuner

on/standby

phones

down up

volume control

pure

input selector

N.B.

pure

enter

band

auto/mono

turning

SPEAKER (6 – 16 Ω)

SUB WOOFER PRE OUT

FM75Ω

FM300Ω GND

ANTENA

SYSTEM

CONTROL

IN IN

CD AUX

REC OUT

PLAY OUT

REC OUT

PLAY OUT

TAPE

R-SE7/SE-7(G)

SERVICE MANUAL

(HM-701)

Knob (K29-6744-04)

AC power cord * (E30-)

Panel * (A60-)

Front glass (B10-2373-03)

Power cord bushing (J42-0083-05)

Indicator (B12-0322-04)

Knob (K29-6358-04)

Metallic cabinet * (A01-)

Escutcheon (B07-2367-03)

Escutcheon (B07-2363-04)

Lock terminal board (E20-0476-05)

Panel * (A60-)

Indicator (B12-0320-04)

Knob (K29-6750-03)

Lock terminal board * (E70-)

PRECAUTIONS FOR REPAIR

• For the SERIAL TEST CODE LIST of the circuit description, see Service manual (B51-5210-00) of R-SA7.

Phono jack (E63-1014-05)

• No connection of ground line if disassemble the unit.

• Please connection the ground line on rear panel, PCBs, Chassis and some others.

Phono jack (E63-0046-15)

Phono jack (E63-0047-15)

Rectangular receptacle (E08-0312-05)

* Refer to parts list on page 25.

DISPLAY

SLEEPTAPE

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

CDP.CALL

R-SE7/SE-7(G)

CONTENTS / ACCESSORIES

CONTENTS / ACCESSORIES .................................. 2

CIRCUIT DESCRIPTION............................................3

ADJUSTMENT............................................................8

PC BOARD .............................................................. 10

Accessories

SCHEMATIC DIAGRAM.......................................... 13

EXPLODED VIEW ....................................................24

PARTS LIST..............................................................25

SPECIFICATIONS ......................................Back cover

AM loop antenna (1) (T90-0820-05)

Audio cords (2) (E30-0615-05)

Remote control unit (1) (A70-1154-05) : KM (A70-1155-05) : TE

AM loop antenna stand (1) (J19-3645-05)

System control cord (1) (E30-2628-05)

FM indoor antenna (1) (T90-0182-15) : KM (T90-0806-05) : ET

Batteries (R6/AA) (2)

Battery cover (A09-0374-08)

System configuration

SYSTEM NAME AMP/TUNER CD PLAYER SPEAKER

HM-701 R-SE7 DP-SE7 LS-SE7

R-SE7/SE-7(G)

Channel

BAND

E TYPE

Channel

BAND

E TYPE

01chFM87.50MHz

11chFM90.00MHz

02chFM97.50MHz

12chFM98.00MHz

03ch

108.00MHZ

13chFM98.50MHz

04chAM630kHz

14ch

106.00MHz

05chAM990kHz

15chAM531kHz

06chAM1440kHz

16chAM990kHz

07chFM87.50MHz

17chAM1602kHz

08chFM87.50MHz

18chFM87.50MHz

09chFM87.50MHz

19chFM87.50MHz

10chFM89.10MHz

20chFM87.50MHz

CIRCUIT DESCRIPTION

1. INITIAL STATE

(1) AMP-related block

EPOWER OFF ESELECTOR SOURCE TUNER EDISPLAY SELECTOR EN.B. CIRCUIT OFF EA CLASS VOLUME VALUE 1.40 STEP EAB CLASS VOLUME VALUE 7 STEP EPURE MODE NORMAL (AB CLASS) EAUTO POWER SAVE OFF EMULTI CONTROL MODE INPUT SEL.(R-SE9 only)

(2) TUNER-related block

EBAND FM EFREQUENCY Lower-limit value of

FM 87.5 MHz AM 531 kHz

EAUTO/MANUAL AUTO EP.CH MEMORY Last frequency ELast P.CH 01ch E

RDS DATA TABLE MEMORY

(3) TIMER-rated block

ECLOCK STOP (AM12:00) EPROGRAM WORKING MODE OFF

CONTENTS OF PROGR

EO.T.T WORKING MODE OFF

OTT ON TIME AM 7:00

(4) TEST PRESET FREQUENCY

ƒThe initial setting is performed in a following event :

1. When backup memory data is destroyed when reset is applied to the microprocessor.

2. When the power cord is plugged in to the AC wall outlet while pressing the on/standby key.

receiving frequency.

NO DATA

. ON=AM 12:00

OFF=AM 12:00 PLAY MODE=PLAY SELECTOR=TUNER(1ch) REC MODE OFF

2. BACKUP

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 signal (CE) of a microcom-

puter is set low when the AC power is turned OFF. The microcomputer detects the signal and enters the stop state. The microcomputer is reset when the AC power is turned ON. The data for backup state confirmation 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.

EThe data for backup state confirmation is written in a RAM

area.

E The microcomputer is set to the STOP mode so as to

save the power consumption.

EA backup state set command signal is detected by a timer

interrupt of 1 msec.

EThe backup guarantee period is set in a circuit.

(2) Backup state setting

EThe data (A596, 5A69H) for backup state confirmation is

written in a RAM area.

(3) Contents of backup data to be held

[[[ AMP [[[

EPOWER ON/OFF EDISPLAY MODE ESELECTOR SOURCE EN.B. CIRCUIT MODE EA CLASS VOLUME VALUE EAB CLASS VOLUME VALUE EPURE A MODE

[[[ TUNER [[[

ELAST BAND EPRESET CHANNEL/RECEIVING STATION FRE-

QUENCY/PI/TA/PTY/PS

E LAST RECEIVING STATION FREQUENCY AND PRE-

SET CHANNEL (AM/FM)

EPRESET MEMORY data (1ch~40ch) EAUTO/MANUAL

[[[ CLOCK/TIMER [[[

ELAST CLOCK DATA E PROGRAMMED CONTENTS/PROGRAM TIMER WOR-

KING MODE ON/OFF

EO.T.T. SETTING TIME/O.T.T. WORKING MODE

ON/OFF

R-SE7/SE-7(G)

CIRCUIT DESCRIPTION

3. DESTINATION LIST OF TUNER

3-1 Destination List of Tuner

Desti-

nation

(RDS)

Receive

BAND frequency

range frequency

87.5MHz~

108.0MHz 530kHz~

1700kHz

87.5MHz~

108.0MHz 531kHz~

1602kHz

87.5MHz~

108.0MHz 531kHz~

1602kHz

K2 or E1 is changed the setting "DSW1".

(DSW1=1 : K2, 0 = E1)

0 : NO DIODE 1 : DIODE X : SWITCHING TRANSISTOR

Channel

space

100kHz +10.7MHz 25kHz

10kHz +450kHz 10kHz

50kHz +10.7MHz 25kHz

9kHz +450kHz 9kHz

50kHz +10.7MHz 25kHz

9kHz +450kHz 9kHz

1F reference DSW1 DSW2

PLL

DIODE SW

D518 D519

1 1

0 1

1 0

X 1

4. TEST MODE

4-1. Initializing

The system is initialized when the power is turned on while pressing the on/standby key.

(1) Contents of operation

EAll the functions are initialized.

4-2. AMP test mode using main unit's keys

4-2-1. Entering the AMP test mode

ETurn on the power while pressing the BAND key.

4-2-2. Canceling the AMP test mode

EBy turning off the power, the system is initialized and the

test mode is canceled. 4-2-3. Contents of AMP test mode (1) Automatic on/standby ON

EThe POWER ON state is entered whenever the power is

turned on while pressing the BAND key. All functions are

then initialized and activated in the all-lighting mode.

ESub-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 continu-

ously NG five times, the system stops with ERR 1 and

ERR 2 displayed. (2) All-lighting mode

EAll the fluorescent display indicators and LED lamps light

when the power is turned on while pressing the BAND

key.

E After that, the all-lighting mode is canceled when any

main unit's key is pressed. The normal display obtained when the selector is set to TUNER then appears.

(3) Others

EThe AMP test mode is not terminated even if the selector

is set to positions other than TUNER.

EIn the AMP test mode, the muting during mode selection

is not controlled. However, the operation during the power-on sequence is the same as the normal operation.

EThe SP protection operation is also the same as the nor-

mal operation.

E In the AMP test mode using main unit's keys, the keys

below provide a special operation according to the position where the selector is set. The main unit's keys except described below and the rotary encoder provide the normal operation.

(4) When selector is set to TUNER

Key Operation

PURE A key Increments the P.CALL every time this

key is pressed.

N.B. key Decrement the P.CALL every time this

key is pressed.

ENTER key Selects the display cyclically in the order

below every time this key is pressed.

@ 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 indicator. If the former is different from the latter, "RAM NG" is displayed.

A Set the TUNER ATT to OFF and display the S level in

hexadecimal when the ENTER key is pressed. ("ATT OFF **" is displayed in the fluorescent display indicator.)

B Set the TUNER ATT to ON and display the S level in

hexadecimal when the ENTER key is pressed. ("ATT ON

**" is displayed in the fluorescent display indicator.) * The special display using the ENTER key is continued until the next operation is carried out. (**: S LEVEL) When keys other than ENTER are pressed in items @to B above, the TUNER ATT is set to OFF and the normal display appears. The operation corresponding to the key that has been pressed is performed in this case.

(5) When selector is set to positions other than TUNER [ENTER key] Every time this key is pressed, master VOL-

UME level is selected cyclically.

INITIALIZE level

Value of Master

VOLUME

MAX 86 16.00

MID 40 8.00 MIN 1 0.20

INITIALIZE 7 1.40

Press the ENTER key.

ìî MAX î MID î MIN ì

Press the PURE A key,

then press the ENTER key.

R-SE7/SE-7(G)

CIRCUIT DESCRIPTION

[ AUTO key ] Selects the MUTE operation and equalizer cyclically in the order below for operation display every time this key is pressed.

-- -> MUTE operation -> Minimum -> Maximum ->

ƒ In the operation for except the AUTO key, become pre-

condition equlizer .

ƒPre condition : The equlizer becomes the condition to be

pushed the AUTO key before (include N.B. circuit).

(6) SERIAL TEST CODE LIST

Refer to Service manual (B51-5210-00) of R-SA7 on

page 7. [ BAND key ] Every time this key is pressed, all the displays go off and the normal display is selected cyclically.

ƒPre-condition

4-3. RDS test mode using main unit's keys

4-3-1. Entering the RDS test mode

ETurn on the power while pressing the TUNING UP key.

4-3-2. Canceling the RDS test mode

EBy turning off the power, the system is initialized and the

test mode is canceled. 4-3-3. Contents of RDS test mode

EThe POWER ON state is entered whenever the power is

turned on while pressing the TUNING UP key. All the

functions are then initialized.

E In the RDS test mode using main unit's keys, the keys

below provides a special operation according to the posi-

tion where the selector is set. The main unit's keys

except described below and the rotary encoder provide

the normal operation.

Key Operation

CLASS A key Performs the same operation as for

remote control key "DISPLAY" every time this key is pressed.

INPUT SEL. key Performs the same operation as for

remote control key "PTY" every time this key is pressed.

N.B. key Performs the same operation as for

remote control key "TA" every time this key is pressed.

ENTER key Selects the display cyclically in the order

below every time this key is pressed.

B Set the TUNER ATT to ON and display the S level in

hexadecimal when the ENTER key is pressed. ("ATT ON

4-4. SERIAL TEST MODE

(1) Setting the serial test mode The unit is put into the serial test mode when a serial code

"TEST ON" is input during the POWER-ON sequence. In the 16-bit serial test mode, serial code C27FH is input.

E In the serial test mode, all remote control keys and ordi-

nary serial codes are disabled. Only the panel keys per-

form the same operation as usually. (2) Canceling the serial test mode

EThe serial test mode is canceled to return to the ordinary

mode by inputting a "TEST OFF" code (C27 EH). After

the ordinary mode was returned, the serial mode is

returned to the state before the test mode is entered.

The backup operation is not initialized.

EThe serial test mode is also canceled when the AC power

is turned OFF. (3) Cautions

EThe serial test code is prescribed as a 16-bit code only. EThe operations below are inhibited in the serial test mode.

The operations mentioned above cannot be guaranteed when they are performed in the serial test mode.

E An identical code is output when the serial test mode

code is input.

@Write data in the unused area of EEPROM, then read the

written data. If the read data is the same as the written data, "RAM OK" is displayed in the fluorescent display indicator. If the former is different from the latter, "RAM NG" is displayed.

A Set the TUNER ATT to OFF and display the S level in

hexadecimal when the ENTER key is pressed. ("ATT OFF **" is displayed in the fluorescent display indicator.)

FL DISPLAY (FIP9GM6R)

RESET

REMOCON

LEVEL IN

CLASS A LED

BIAS MID

BIAS HI

LOW RELAY

HI RELAY

SPEAKER RELAY

(X09) J5

(X14) IC2

(X14) S2

DATA BUSY

ENC-C ENC-D

(X14) ED1

(X05) IC2

(X09) IC1

(X14) IC3

u-COM

uPD78045FGF057

PLL IC (LC72131)

KEY MATRIX

SELECTOR ANALOG SW CONTROL IC (NJU7313AM)

E2PROM IC (X24C04)

MULTI CONTROL ENCODER

(R-SE9 only)

(X14) S1

ENC-A ENC-B

VOLUME ROTARY ENCODER

(X14) IC4

SIGNAL LEVEL RDS CLOCK RDS DATA

RDS

(X09) IC3

ELECTRIC VOLUME IC (M62420)

SD STEREO HEAD PHONES PROTECTION

A MUTE T MUTE H. P. MUTE ATT A CLASS ON

✽

SERIAL

R-SE7/SE-7(G)

CIRCUIT DESCRIPTION

5. Microprocessor : uPD78045FGF057 (X14 : IC1)

5-1 Microprocessor periphery block diagram

Key matrix

KS0 DSW0 DSW1 (D158) DSW2 (D159)

KS1 POWER AUTO / MONO BAND

KS2 N. B. CIRCUIT

KS3 pure A ENTER

KR0

No. of : u-COM port No.

KR1

(R-SE7) INPUT SEL.

(R-SE9) MODE

(R-SE7) TUNING UP

(R-SE9) No. use

(R-SE7) TUNING DOWN

(R-SE9) No use

KR2

R-SE7/SE-7(G)

CIRCUIT DESCRIPTION

5-2 Pin description

Pin No. Name I/O Description Active

1~7 7G~1G O FL grid 7~1 —

8 VDD — Micro processor power supply (+5V) —

9 E2PROM SCL O E2PROM control clock — 10 E2PROM SDA I/O E2PROM control data — 11 ENC C — Multi control encoder input A — 12 ENC D — Multi control encoder input B — 13 A CLASS ON O Power ON/OFF control signal H : OFF L : ON 14 SEL STB O Selector IC strobe — 15 SEL/PLL CLK O SEL/PLL IC control clock — 16 SEL/PLL DATA O SEL/PLL IC control data — 17 RESET I Microprocessor reset L : RESET ON 18 CE I AC OFF(MAIN POWER) detection Signal L : AC OFF 19 PLL DO O IF count data — 20 AVSS — A/D power SUPPLY (GND) — 21 PLL CE O PLL chip enable control L : CE 22 T MUTE O Tuner mute signal L : MUTE ON 23 STEREO I Stereo signal detection L : STEREO ON 24 SD I Synchronized signal detection — 25 VOL SCL O Electric volume IC control clock — 26 VOL SDA O Electric volume IC control data — 27 LEVEL IN I Volume level input —

★ 28 S.LEVEL(RDS) I Signal level —

29 A VDD — A/D power supply (+5V) — 30 A VREF — A/D reference voltage(+5V) —

31, 32 OSC — 32kHz oscillator —

33 Vss — Microprocessor power supply (GND) —

34, 35 OSC — 4.19MHz oscillator —

36 S.DATA I/O 16bit system data — 37 S.BUSY I/O 16 bit system busy H : BUSY L : READY 38 H.P. MUTE O Head phones mute signal L : ON 39 ATT O CLASS A control signal H : A CLASS L : AB CLASS 40 A MUTE O Audio mute signal L : ON 41 HIGH RELAY O AMP high relay control H : ON L : OFF 42 LOW RELAY O AMP low relay control H : ON L : OFF 43 SP RELAY O Speaker relay control H : ON L : OFF

★ 44 CLK(RDS) I RDS clock — ★ 45 DATA(RDS) I RDS data —

46 PROTECTION I Protection detection H : ON L : OFF 47 REMOCON I Remote control input — 48 IC — — — 49 CLASS A LED O CLASS A LED H : OFF L : ON 50 BIAS MID O Bias control signal MID — 51 BIAS HI O Bias control signal HI — 52 VDD — Microprocessor power supply (+5V) — 53 ENCA I Volume encoder in put A — 54 ENC B I Volume encoder input B — 55 HEAD PHONE I Head phones signal detection H : ON L : OFF

56, 57 NC O — — 58~60 KR2~KR0 I KEY return 2~0 H : KEY ON 61~64 SEG16~13/KS3~0 O FL Segment 6~13 /key scan 3~0 H : ON 65~70 P12 SEG12~SEG7 O FL Segment 12~7 H : ON

71 V load — FL drive power supply (-30V) —

72~77 P6 SEG6~SEG1 O FL Segment 6~1 H : ON

78 NC O — —

79, 80 9G, 8G O FL grid 9, 8 —

★ E/T type only, other types unused.

The RDS PTY AF search always corresponds to a span search of 100kHz. Therefore, a span search of 50 KHz cannot be performed.

R-SE7/SE-7(G)

NO.

ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

TUNER

SETTINGS

ALIGNMENT

POINTS

ALIGN FOR

FIG.

DISCRIMINATOR

(A)

98.0kHz

1kHz, ±75kHz dev.

60dBµ(ANT input)

Connect a DC

voltmeter

between

Pin 1 and Pin 2

of CN 2.

MONO

98.0MHz L 31

(a)

L 32

Minimum distortion.

DISTORTION

(STEREO)

(C)

98.0MHZ

1kHz, ±68.25kHz dev.

Pilot: ±6.75kHz dev.

60dBµ(ANT input)

(B)

AUTO

98.0MHz

IFT (A1)

Minimum distortion.

(a)

NO.

ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

AMP

SETTINGS

ALIGNMENT

POINTS

ALIGN FOR

FIG.

POWER: ON SELECTOR : AUX

B CLASS

IDLE CURRENT

Connect a DC

voltmeter across

CN1(L) CN2(R)

(X09, A/7)

PURE A : OFF

Volume : 0

VR1(L)

VR2(R)

(X09, A/7)

20mV

(b)

SPEAKER (6 – 16 Ω)

SUB WOOFER PRE OUT

FM75Ω

FM300Ω GND

ANTENA

SYSTEM CONTROL

IN IN

CD AUX

REC OUT

PLAY OUT

REC OUT

PLAY OUT

TAPE

Oscilloscope

Distortion meter

AC voltmeter

Dummy antenna

(A)

(B)

(C)

(D)

FM SG

MPX

FM SG

AM SG

(a) (b)

CN1(L) CN2(R)

Dc voltmeter

20mV

FM SECTION SELECTION :FM

X05-4622-71 (E/T TYPE)

AUDIO SECTION (X09-469x-xx)

ADJUSTMENT

—

SYSTEM CONNECTIONS

R-SE7/SE-7(G)

PARTS DESCRIPTIONS

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