Sony ICF-7600DA - Page 10

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.