Circuit Description - Kenwood R-SE7 Service Manual

1. INITIAL STATE
(1) AMP-related block
EPOWER
ESELECTOR SOURCE
EDISPLAY
EN.B. CIRCUIT
EA CLASS VOLUME VALUE
EAB CLASS VOLUME VALUE 7 STEP
EPURE MODE
EAUTO POWER SAVE
EMULTI CONTROL MODE
(2) TUNER-related block
EBAND
EFREQUENCY
FM
AM
EAUTO/MANUAL
EP.CH MEMORY
ELast P.CH
ERDS DATA TABLE MEMORY
(3) TIMER-rated block
ECLOCK
EPROGRAM
CONTENTS OF PROGR.
EO.T.T
OTT ON TIME
(4) TEST PRESET FREQUENCY
Channel BAND E TYPE
01ch FM 87.50MHz
02ch FM 97.50MHz
03ch FM 108.00MHZ
04ch AM 630kHz
05ch AM 990kHz
06ch AM 1440kHz
07ch FM 87.50MHz
08ch FM 87.50MHz
09ch FM 87.50MHz
10ch FM 89.10MHz
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.

CIRCUIT DESCRIPTION

OFF
TUNER
SELECTOR
OFF
1.40 STEP
NORMAL (AB CLASS)
OFF
INPUT SEL.(R-SE9 only)
FM
Lower-limit value of
receiving frequency.
87.5 MHz
531 kHz
AUTO
Last frequency
01ch
NO DATA
STOP (AM12:00)
WORKING MODE OFF
ON=AM 12:00
OFF=AM 12:00
PLAY MODE=PLAY
SELECTOR=TUNER(1ch)
REC MODE OFF
WORKING MODE OFF
AM 7:00
Channel BAND E TYPE
11ch FM 90.00MHz
12ch FM 98.00MHz
13ch FM 98.50MHz
14ch FM 106.00MHz
15ch AM 531kHz
16ch AM 990kHz
17ch AM 1602kHz
18ch FM 87.50MHz
19ch FM 87.50MHz
20ch FM 87.50MHz
R-SE7/SE-7(G)
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
E The 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
3