Sony ICF-7600DA User manual

Circuit system
Frequency range
Antennas
Speaker
Power output
Outputs
Power requirements
Battery life
mm
MICROFILM
AEP Model
UK Model
E Model
AUS Model
ICF-7600DA:
US Model
Canadian Model
ICF-7700:
SPECIFICATIONS
FM: Superheterodyne Dimensions Approx. 191.5 x 117 x 31.5 mm (w/h/d)
LW/MW/SW: Dual conversion superheterodyne (7° x 4° x 1% inches)
FM: US, Canadian model: 76.0—108.0 MHz including projecting parts and controls
Weight 607 g (1 Ib 5% oz)
AEP, UK, E, AUS model: 87.5—108.0 MHz
MW:
530-
1,700
kHz
including
batteries
Supplied accessories Earphone (1)
LW: 150-285 kHz aid ea
SW (1-12 SW broadcast bands): 3,050- 26,100 kHz jort wave guide (1)
Carrying case (1)
FM/SW: Telescopic antenna
MW/LW: Built-in ferrite bar antenna SW compact antenna (1)
Approx. 7.7 cm (3% inches) dia.
400 mW (at 10% harmonic distortion)
Recording output jack (minijack)
output level 0.775 mV (—60 dB)
output impedance 1 kilohm
Earphone jack (minijack) for 8 ohm earphone
6V DC
Four size AA (R6) batteries
OC IN 6 V jack accepts:
Sony AC-D4S AC power adaptor (optional) for use on 120 V
AC, 60 Hz
Sony DCC-127A or DCC-240 car battery cord (optional) for
use with 12 V or 24 V car battery, respectively
Sony EBP-6 battery case (optional) for use with four size C
(R14) batteries.
Approx. 19 hours of listening for four hours a day at a normal
volume, using Sony batteries SUM-3 (NS)
FM/LW/MW/SW
PLL SYNTHESIZED RECEIVER
SONY.

- ICF-7600DA/7700 |
TABLE OF CONTENTS
Title
Description
Page
Specifications...
..................0.
1
Peatures
i
6
eis
hed
eRe
ae
ack
i
ete
2
Flexible
Circuit
Board
Repairing
........
2
Main
Board
Removal................
2
Replacing
Chip
Components...........
3
Section].
Outline......................0..
4
1-1.
Location
and
Function
of
Controls.......
4
1-2.
Outline
of
the
C-MOS
Digital-Tuning
System IC201, uwPD1715G ............ 5
1-2-1. Outline of the Station-Selection......... 5
1-2-2. Description on the Terminals........... 5
1-2-3. On the Key Matrix.................. 9
1-2-4. Description on Displaying Function ...... 13
1-2-5. Imitial-State Setting. ..........2..... 14
1-2-6. Muting-Output Timings .............. 14
1-3. Outline of Terminals of the LCD Dot-Matrix
Segment Driver IC202, MSM5259GS...... 16
1-4.
On
the
new
LCD
panel,
LCD1..........
18
Section 2. Electrical Adjustments............... 19
Section 3. Diagrams....................000. 25
3-1. Semiconductors Lead Layouts.......... 25
3-2. Mounting Diagram(1) ............... 26
3-3. Schematic Diagram(1)............... 31
3-4. Mounting Diagram (1) ............... 35
3-5. Schematic Diagram (2)............... 39
3-6. Mounting Diagram (2)............... 44
Section
4.
Exploded
Views
and
Parts
List..........
49
Section
5.
Electrical
Parts
List.................
$1
Troubleshooting Guide............... 56
NOTE: Removal and Block Diagram Sections have been omitted.
FEATURES
¢ An FM/LW/MW/SW 1-12, 15 bands portable radio with world-wide band
coverage.
¢ A quartz-controlled PLL (Phase Locked Loop) synthesizer system using a
microcomputer for easy pinpoint tuning.
The tuned frequency is also‘digitally displayed.
¢ Up to 15 stations can be preset for button-touch tuning.
° An easy searching a SW station with the SW meter band select function.
¢A timer standby function to receive a desired broadcast at the desired time.
°A sleep timer turns the radio off automatically in 65 minutes.
Flexible Circuit Board Repairing
1. Keep the temperature of the soldering iron at
270° + 10°C during repairing.
You can maintain the temperature of the
soldering iron around 270°C by using the ther-
mal controller as illustrated on the right.
2. Do not touch the soldering iron more than 4
seconds or 3 times on the same conductor of
the circuit board.
3. Do not apply force on the conductor when
soldering or unsoldering.
Tip of soldering iron
good wrong
———_ -- _an—0"nwm—S-
MAIN BOARD REMOVAL
Unsolder the ground-connecting pin at the main board as
shown below.
main board
ground-connecting pin

Replacing chip components
All chip components should be connected and disconnect-
ed, using a tapered soldering iron [temperature of the iron
tip: less than 280°C (536°F)] , a pair of tweezers and braid-
ed wire.
Precautions for replacement
1.
Do not disconnect the chip component forcefully.
Otherwise, the pattern may peel off.
. Never re-use a disconnected chip component. Dispose of
all old chip components.
. To protect the chip component, heating time for attach-
ing the component should be within 3 seconds.
© Removing chip components
(1) Removing solder at electrode
Remove the solder at the electrode, using a thin
braided wire. Do not remove the solder of the part
(chip component) attached adjacent to the electrode.
Pattern
Braided wire
(2) Disconnecting chip components
Turn the tweezers with the soldering iron alternately
applied to both electrodes, and the chip component
will be disconnected. Take careful precautions while
disconnecting, because if the chip component is force-
fully removed the land may peel off.
lsever re-use a disconnected chip component.
Turn
Tweezers i
(3) Smoothing the soldered surface
After disconnecting the chip component, remove the
solder by using a braided wire to smooth the land
surface.
O° Connecting chip components
The value of chip components is not displayed on the
main body. Take due precautions to avoid mixing new
chip components with other ones.
(1) Applying solder to land on one side
Apply a thin layer of solder to the land on one side
where the chip component is to be connected. Too
much solder may cause bridging.
Small BX
(2) Speedy soldering
Hold the chip component at the desired position,
using tweezers, and apply the soldering iron in the
arrow-marked direction. To protect the chip compo-
nent, heating time should be within 3 seconds.
Soldering iron
cA)
Land Printed circuit board
(3)
Speedy
soldering
of
electrode
on
the
other
side
Solder
the
electrode
on
the
other
side
in
the
same
way
as
in
(2)
above.

1-1. LOCATION AND FUNCTION OF CONTROLS
Front panel
STANDBY (timer standby) button
ALARM TIME SET button
CLOCK TIME SET button
KEY PROTECT button
SECTION 1
OUTLINE
SLEEP timer button
MAIN POWER switch
ON: To turn on the radio or to set the timer.
OFF: When carrying the radio. The radio is kept turned
off even if the ON/OFF button is accidentally
pressed.
ON/OFF button
Speaker
Hand strap
TUNING indicator
Lights up when the signal is received.
TUNING/TIME ADJ (tuning/time
adjustment) control
TONE control
Adjust the tone quality to your preference.
Normally set the control to MUSIC. When the noise is
severe during SW reception, set it to NEWS. The noise
May be reduced to some extent and the vocal part will
be heard more clearly.
<= mb SELECT — (meter band select) button
Band select buttons
(Sw, MW/LW, FM)
Radio stand
Lift up the stand for table use.
If the stand comes off, put it back into.
Telescopic antenna
ALARM selector
(RADIO/BUZZER)
Recording output jack
@ Earphone jack
When the earphone is
plugged in, the sound from
the speaker does not come
out.
DC IN 6 V (extemal! power
input) jack
MW CH STEP selector
Battery compartment
PRESET buttons
VOLUME control
to decrease the volume to increase the volume
tome =
qerrieevige
MIN MAX
ENTER button
Display window
The indications appear as follows.
KEY PROTECT
indicator
Time/frequency indicator
MAIN POWER indicator
PRESET number
indicator
Band indicator
FM, MW/LW band
scales
SW meter band scales
CLOCK/ALARM/STANDBY/SLEEP indicators
BUZZER ALARM indicator

1-2. OUTLINE OF THE C-MOS DIGITAL-TUNING SYSTEM 1C201, uPD1715G-529.
1-2-1. OUTLINE OF THE STATION-SELECTION
1) Receiving-frequency Coverages:
The following table shows the frequency coverages the uPD1715G-529 can receive.
CHANNEL NUMBER OF NOMINAL | INTERMEDIATE
FREQUENCY COVERAGE | SrepaRATION | CHANNEL SPACING __| FREQUENCY
150kHz~ 285kHz | 3kHz | 46ch 3kHz 10.71MHz
d31kHz~ 1,602kHz 3kHz 359ch 3kHz 10.71MHz
030kHz~ 1,700kHz 5kHz 235ch 5kHz 10.71MHz
3,050kHz~ 3,565kHz 5kHz 104ch 5kHz 10.71MHz
3,700kHz~ 4,215kHz 5kHz 104ch 5kHz 10.71MHz
4,650kHz ~ 5,165kHz 5kHz 104ch okHz 10.71MHz
5,800kHz ~ 6,315kHz 5kHz 104ch 5kHz 10.71MHz
6,950kHz~ 7,465kHz 5kHz 104ch 5kHz 10.71MHz
9,375kHz ~10,010kHz 5kHz 128ch 5kHz 10.71MHz
11,525kHz ~12,160kHz 5kHz 128ch 5kHz 10.71MHz
13,375kHz ~14,010kHz 5kHz 128ch 5okHz 10.71MHz
14,975kHz ~15,610kHz 5kHz 128ch okHz 10.71IMHz
17,475kHz ~18,110kHz 5kHz 128ch okHz 10.71MHz
21,325kHz ~21,960kHz 5kHz 128ch okHz | 10.71MHz
25,475kHz ~26,100kHz okHz 126ch okHz 10.71MHz
87.50MHz~108.00MHz | 50kHz 41l1ch ds0kHz 10.7MHz
76.00MHz ~ 108.00 MHz 30kHz | 50kHz 10.7MHz
NOTE: LW and MW1 (or MW2) bands are taken into a single band in the uPD1715G-529.
+
2) Station-selecting Functions:
a) Manual up/down selection by using the rotary encoder tuning dial.
b) Random selection out of the preset memories by key-in calling.
LW and MW bands: 5 stations
SW band: 5 stations
FM band: 5 stations
total 15 stations
c) Last-channel memory writing and calling:
One channel is provided for each receiving band, total of 15 (fifteen).
1-2-2. DESCRIPTION ON THE TERMINALS
1) Terminal Arrangement
((8) VDP/PG 2
(7) Vss 2
(cap |
(8) cap 2
(14) Vss 3

SYMBOL
NAMING
DESCRIPTION
1 THRU 10
LCD9
THRU
LCD1
LCD
SEGMENT
SIGNALS
Transmit the segment-output signals to the LCD panel. When matrixes are configured
together with the COM1 thru COM3, a display of 48 dots can be made. These output signals
are output when the LCDD commands are made.-The LCD-driving voltages are of 3.1V typi-
cal, 1/2 bias and 1/3 duty when the frame frequency is 100 Hz.
These LCD11 through LCD16 can also be used at the same time as the key source signals for
the key matrix. These signal are output on time-division bases, and they are output as the
key-source signals at the repetition rate of 6.7 msec.
Whether the key-source signal are to be output while having displays on the panel is depend-
ent upon and selectable by the programs used.
These terminals become automatically in the ““L” (low) state, i.e., non-display mode, at the
power-on reset (VDD changes from low to high state) and at the stoppage moment of the
clock. The display mode does not change at the reset moment in which CE changes from low
to high state. :
11 THRU
13
LCD
COMMON
SIGNAL
VDP
(POWER-
OUTPUT)
CGP
(MUTE/
BUZZER)
CAPACITOR
CONNECTION
TERMINAL
FOR
DOUBLER
VARIABLE
DUTY
PORT
(POWER-
SUPPLY
CONTROL
SIGNAL)
CLOCK
GENERATOR
PORT
(MUTE/
BUZZER
SIGNAL)
INPUT
OF POWER
SUPPLY
VOLTAGE
Transmit common signals to the LCD panel. When the matrixes are configured together with
the LCD1 through LCD16, a display of 48 dots can be made.
Three distinctive signals of VSS3, VSS2 and VDD are output through these terminals at the
repetition rate of 50 Hz.
These terminals become automatically in the ‘““L”’(low) state, i.e., non-display mode, at the
power-on reset (VDD changes from low to high state) and at the stoppage moment of the
clock.
Capacitor-connection terminals to make a
proper voltage doubler to build the 3.1V typi-
cal LCD-driving voltage VDD.
Normal circuit configuration is as follows.
Outputs the variable-duty or the one-bit (PG2) signal. The selection of either of them is
programmable. When used as the VDP, this terminal transmits the pulse chain of 1.12 kHz
continuously, and its duty can be selected from the available 64 steps.
26.7 us 867 us 2 65
= uw ir
893us 893us 67 67
This port can be used as a D/A converter by adding-an integration circuit to this terminal.
Outputs the clock-generator or the one-bit (PD3) signal.
The selection of either of them is programmable. When used as the CGP, this terminal can
transmit the pulse chain of 1 kHz of 46.6% duty or 3 kHz of 60% duty.
In this set, this port outputs a signal to mute noises encoutered in the unlocked condition
of the PLL. When the buzzer output is specified to be output in the alarm operation, this
port outputs the buzzer signal of 1 kHz.
Receives the power-supply voltage for this device. In operation, a voltage of 2.2 to 3.5 VDC
is applied to this terminal. The input voltage can be lowered down to 2.0 VDC when any of
the interna] data in the RAM, i.e., when the CKSTP command is under execution, is to be
holded.
The power-on reset circuit of device starts to operate at the instance this terminal receives
a voltage of 0 (zero) to 2.0 VDC, and the program starts from the location 0 (zero).
Note: This pin and pin 46 are connected internally. So, it is not necessary to apply the
power-supply voltage to both of them. The ceramic-packaged device, however, has
a not-to-be connected pin 46, i.e., N.C. terminal.
CONTROL-
SIGNAL
INPUT
FOR
DIVIDER
Determines the dividing ratio of the fixed-division prescaler.
A 1/4 dividing ratio is made when this terminal is held at ‘““H” (high), and a 1/2 divider is
made when held at “‘L”’ (low).
This port is used only when the VCOH terminal (FM in this set) i.e., pin 22 is used.
This set uses this port asa 1/4 divider.
FM OSC
SIGNAL
INPUT
Receives frequencies from 10 MHz to 130 MHz or from 10 MHz to 100 MHz both of a level
of 0.2 Vp-p minimum from the local-oscillator output, i.e., the VCO output. This input
signal is connected internally in this device through the 1/2 fixed-divider prescaler or the
1/4 fixed-divider prescaler and through the two-module prescaler composed of 1/32 and
1/33 frequency dividers to the internal programmable counter.
This terminal is pulled down to the ground level when the direct frequency-dividing sys-
tem is taken into the circuit or when the Pulse-Swallow system is used with the HF com-
mand executed, i.e., the VCOL (AM) terminal is selected.
A capacitor coupling is needed due to the inclusion of alternate current amplifiers inside
this device.

NAMING
DESCRIPTION
AM OSC
SIGNAL
INPUT
GROUND
Receives an AM local-oscillator signals, i,e., the VCO signal from 0.5 MHz to 40 MHz of
0.2 Vp-p minimum.
This port is selected when the direct frequency-dividing system or the Pulse-Swallow system
is used and, at the same time, the HF command is executed. These two systems are, how-
ever, different one another as shown below.
INPUT LEVEL
(MINIMUM)
0.1 Vp-p
DIVIDING
RATIO
16 to (2'?-1)
1,024 to
(2'7-1)
INPUT FRE-
QUENCY
0.5 to 15 MHz
DIVIDING SYSTEM
DIRECT
PULSE-SWALLOW
(HF COMMAND
EXECUTED)
*0.5 to 40 MHz
This terminal is pulled down to the groung level when the Pulse-Swallow system is used
together with the VHF-command execution, i.e., the VCOH (FM) terminal is selected.
A capacitor coupling is needed due to the inclusion of alternate current amplifiers inside
this chip.
The ground-return terminal! of this device.
ERROR
OUTPUT
ERROR
OUTPUT
Transmits the error signal of the PLL system. When the resultant frequencies obtained by
dividing the local-oscillator frequencies are higher than the reference frequency, an “H”
(high)-level signa! is output from this port. When these are lower, on the contrary, an “L”
(low)-level signal is output from this port. When these divided frequencies just coincide
with the reference frequency, this port becomes in a floating state. These output signals
from this port then go through the external lowpass filter to the varactor diodes in the
tuned circuits in these frontends of the receiver, The same output waveform as the terminal
E01 is obtainable from the next terminal E02, pin 26, and so these two are user-selectable.
When the PLL is disabled, i.e., when the system is set by the PLL commands or the CE
terminal, pin 27, is set to the ‘‘L” (low)-level, these E01 and E02 terminals become in the
floating states.
XO
XI
CHIP
ENABLE
Receives the state-selection signals for this device.
When set at “H” (high), this device works, and vice versa. The PLL section of this device
becomes forcively in a disabled condition in the duration of wider than 140 psec of the “L”
dow)-level state. The duration, however, of shorter than 140 usec is not taken into account.
The programmes are using the CKSTP commands. The CKSTP commands are effective only
when the state of this CE is in an “L”’ (low) condition. When this CE terminal is in an “1H”
state, these programmes work like under NOP commands.
When the CKSTP commands are executed when this CE terminal is in an “‘L” (low) level,
the internal clock generator and the internal CPU are disabled. In this disabled condition,
the RAM-memory backupings can be made under a very-low current consumption of 3 uA
maximum. In this condition, these display-output signals LCD1 through LCD16 and the
COMI COM3 become in the eff-display mode, i.e., the ‘‘L”’ (low) state.
When the level of this CE terminal is changed from “‘L” to “H”, this device is reset and its
programmes start from the location ‘‘0” (zero). In this state, the Port A becomes in the
input mode.
CRYSTAL
OSCILLATOR
PA3
THRU
PAO
PORTA
(K-ENTER)
(DAT-R)
(REQ-R)
(RES-R)
(ENTER-KEY
IN)
(ENCODER
DATA IN)
(ENCODER
REQUEST)
(ENCODER
RESET)
An external quartz-crystal oscillator connects to these terminals to obtain 75 kHz signal
generator for the devices.
4-bit I/O (Input/Output) ports. These ports enable the device designate input or output bit
by bit. The each designation is, in turn, performed by the contents in the location “1 FH” in
the ‘BANK 0 (zero)” in the data memory (RAM), called as a “‘PAIO word”. At these
instances as the power-on, clock stoppage and the initial setting of the CE terminal from
“L” to “H”, these terminals automatically become in the input ports.
Under the port-operation commands like ‘‘IN”, “OUT”, “SPB”, ‘““RPB” commands, etc.,
the PAO port coincides with the least significant bit of the registor or the operand, the
PA3 coincides with the most-significant bit of them. The same applies to the port B and
Port C respectively.
In this set, the PA3 (K-ENTER) port receives these return signals from the momentary
ENTER and alternate BUZZER keys and the key matrix is as shown below.
KEY SOURCE
DAT-S RES-R
ENTER
BUZZER __|
In this set, PA2 through PAO are used to receive and transmit these signals to perform the
readings of information from the tuning rotary encoder.
K-ENTER

NAMING
DESCRIPTION
(cont'd)
input
signals:
data
signal
from
the
rotary
encoder
and
request
signal
from
the
rotary
encoder
output
signal:
reset
signal
from
the
rotary
encoder
A
partial
circuit
of
the
rotary
encoder
and
these
corresponding
waveforms
at
each
input
or
output
terminal
are
those
shown
below.
_|
4-bit exclusive output ports.
34 PB3 PORT B
THRU THRU
37 PBO
(34)
(LAT-B)
(LATCH
SIGNAL)
(BAND
INFO.)
(35)
(LAT-A)
(LATCH
SIGNAL)
(FREQ.
POSITION
DISPLAY)
(36) (DAT-S) (DATA
SIGNAL)
(37) (CLK-S) (CLOCK
SIGNAL)
For
ports
PBO
and
PB1,
the
sink
current
is
minimized
to
a
specially-low
drain,
so
the
PBO
and
PB]
are
able
to
be
used
as
the
return-signal
sources
for
the
key
matrix.
Accordingly,
any
of
the
reverse-current-preventive
diodes
-can
be
eliminated
when
these
PBO
and
PB1
ports
are
used
as
the
key-return-signal
sources.
When
these
ports
are
used
as
ordinal
output
ports,
it
will
happen
any
of
the
low-level
output
signal
will
not
be
output
properly
depend-
ing
upon
the
circuit
employed,
because
of
the
low
sink
current.
In
these
cases,
pull-down
resistors
are
used
in
these
output
lines.
Under
the
port-operation
commands
like
“IN”,
“OUT”,
“SOB”,
“RPB”
commands,
etc.,
the
PAO
port
coincides
with
the
least
significant
bit
of
the
registor
or
the
operand,
the
PA3
coincides
with
the
most-significant
bit
of
them.
The
same
applies
to
the
Port
B
and
Port
C
respectively.
These
exclusive
output
ports
should
be
initialized
using
the
programmes,
because
these
ports
output
unstable
and
undefined
output
signals
at
the
initial
power-on
condition,
i.e.,
from
“‘L”
to
“H”.
The
output-data
contents
are
the
same
as
these
previous
last
ones
when
the
CE
terminal
changes
from
“‘L”
to
“H”
or
from
“‘H”
to
“L”,
and
when
the
CKSTP
commands
are
under
execution.
Accordingly,
the
initialization
with
programmes
is
needed
too
where
required.
In
this
set,
these
ports
are
used
as
those
shown
in
the
parenthesises.
The
40-bit
frequency-position
displaying
information
and
the
8-bit
band
information
are
sent
out
to
external
circuits
as
serial
data
flows.
The
data
and
the
clock
signals
are
used
in
common
for
the
band
information
(for
IC201)
and
for
the
frequency-position
information.
A partial block diagram is shown blow.
BAND-OUTPUT CODE
—_—_—___
LSB=>MSB
BUZZER
SWL_
SWH
ALARM
DATA
| BAND INFORMATION
CLOCK LATCH
METER-BAND FREQUENCY SCALE
INDICATOR
FREQUENCY-POSITION
DISPLAYS
DISPLAY
DATA FREQUENCY-POSITION
DISPLAYS
CLOCK LATCH
CLOCK LATCH
FREQUENCY
POSITION
trailing
edge
low
level
DISPLAY
BAND
INFORMATION
leading
edge
leading
edge
|
Note:
Frequency-position
display
turns
on
when
the
data
is
“1”.

PIN Nr. NAMING DESCRIPTION
(cont'd)
BAND
BAND-OUTPUT
CODE
(BINARY)
ee MSB:<—> LSB
LW/MW1/MW2 0
SW (90m)
SW (75m)
SW (60m)
SW (49m)
SW (41m)
SW (3lm)
SW (25m)
SW (21m)
SW (19m)
SW (16m)
SW (13m)
SW (11m)
FM1/FM2
PR SH OOO OR SE Ee oO] oO meMOOrF ROOF ROOF |e
mele eee DOO OO
Be POrROrORFrOrF OF OF! ao
1 1
NOTE: Also refer to 1-2-4. Description On
Displaying Function on later pages.
PC3 (KS3) Refer to the PORT B outlined above. All the ports of this PORT C apply to the description
THRU for the PORT B.
PC1 (KS1) In this set, these ports output signals to be used as the signal sources for the key matrix.
This is a free terminal and is not connected to the internal circuits, and this terminal can
be used as a junction land.
Refer to description for pins 38 through 40 outlined above.
KEY 4-bit exclusive input ports. These are normally used as the key-matrix input terminals.
INPUTS When the KIN or the KI commands executed, the conditions of these pins are read into the
RAM data memories designated by the operand portion of these commands.
These ports are so configured that the port C and the LCD 9 LCD 16 can specifically be
used as the key-return signal sources. When these LCD 9 through LCD 16 are used as the
key sources, these keyed signals are output from these corresponding port every 6.7 msec
while displaying keyed information on the display panel of the radio.
Whether these keyed source signals are properly output or not is judged by the TKLT or the
TKLF commands. Accordingly, it is requisite to execute the KI or the KIN commands after
‘a proper command execution of TKLT or TKLF, i.e., after the solid confirmation of key-
source signal outputs.
Same as pin 20.
Same as pins 43 through 45.
Same as pins 1 through 10.
Same as pin 41.
1-2-3. ON THE KEY MATRIX
1) On The Key Matrix TABLE
The key matrix of this set is configured as shown below.
K3 (PIN 43) K2 (PIN 44) K1 (PIN 45) KO (PIN 47) :
= (PIN 38) (PC3) PRESET 5 (S216) PRESET 4 (S215) PRESET 3 (S214) | PRESET 2 (S213)
| KS2 (PIN 39) (PC2) PRESET 1 (S212) FM (S211) LW/MW (S210) sw (S209)
| KS1 (PIN 40) (PC1) ALARM (S208) CLOCK (S207) | | DOWN _ (S206) UP (S205) |
KSO (PIN 42) (PCO) STANDBY (S204) KEY PROTECT (S203) SLEEP (S202) i ON/OFF (S201) |
DAT-S
(PIN
36)
FM/FM2*
MW1/MW2*
(PB1)
(JUMPER)
(DIODE)
* :
initially
set by
diodes
K-ENTER (PIN
30) (PA 3)
eK :
alternate
key
DAT-S(PIN
36)(PB1)
ENTER
(S217)
no
mark
:
momentary
keys
RES-R(PIN 33)(PA0) BUZZER** (S220)
—-9-

2) On The Initial-state Setting Diodes:
The FM-band frequency-coverage switching diode D202 and the MW-band channel-separation diode D203, i.e., the initial-state
determining diodes are read only at the initial power-supply leading edge and at the moment when the CE (Chip Enable) termi-
nal changes from “L” (low) to “H” (high) state. Diode D202 is solder bridge selected, and diode D203 is slide-switch selected
by the MW CH STEP switch $218 as outlined below. Both of these selecting parts are installed on the key board. The solder
bridging is factory selected for the specific destinations, and the MW CH STEP switch is selectable by the user from the battery
compartment.
FUNCTION DESCRIPTION
FM1/FM2 FM band frequency coverage change (D202) FM-band frequency coverage can be changed as follows.
(solder-bridge)
Bridge condition Coverage
shorted 87.50MHz — 108.00MHz
opened 76.00MHz — 108.00MHz
Mw1/Mw2 MW-band frequency coverage and channel MW-band frequency coverage and channel separation can
(MW CH STEP separation changes (D203) be changed as follows.
switch $218)
shorted 530kHz—1700kHz
§31kHz—1602kHz
3) On The Alternate BUZZER Key (S220):
FUNCTION DESCRIPTION
Buzzer
output/radio
output
changeover
(S220)
a)
When
the
ALARM
switch
$208
is
turned
on,
the
ALARM
switch
$220 determines
either
of the
buzzer
or
radio
output.
When
$220
is
shorted,
the
buzzer
output
is
obtained
and
the
LCD
displays
“BUZZER”.
When
$220
is
turned
to
RADIO,
“BUZZER”
display
disappears.
b) The BUZZER-RADIO changeover can be made anytime.
During the BUZZER on condition, however, the BUZZER-
RADIO changeover (BUZZER to RADIO or RADIO TO
BUZZER) cannot be performed, though the LCD display
changes.
BUZZER
4) On the Mometary Keys:
As outlined above in 1), Key Matrix Table, there are 17 (seventeen) momentary key switches. These key.switches work under
the following four conditions.
a) Always seeing the input conditions. :
b) When being pushed, each key performs its function as a most-new information, and all the previous operations cease.
c) First in, first served. The duplicate key pressings one after another at a time are prohibited. When a second or third key is or
are pressed while a first key is kept pressed, these second or third key or keys are negrected.
d) When two or more than three keys are just simultaneously pressed, a function of higher priority key is sélected.