Icom IC-R7O Maintenance Manual page 8

2-3 REAR PANEL
@ SCOPE
TERMINAL
e— #
@ LOW BAND
ANTENNA
TERMINAL
(ANT 1)
) t 2
a An
= J -
37. MUTE TERMINAL
When you wish to use the unit together with a
transmitter or transceiver, ground this terminal
in the transmit mode; the unit is muted and
monitors the transmitted signals.
38. EXTERNAL SPEAKER JACK
When an external speaker is used, connect it
to this jack. Use a speaker with an impedance
of 8 ohms. When the external speaker is
connected, the built-in speaker does not func-
tion.
39. ACCESSORY (ACC) SOCKET
Various functions are available through the
accessory socket, such as frequency control,
receiver output, T/R changeover, etc. The table
below shows those terminals.
FUNCTION
| 8 volts DC is available when the squelch is
closed,
|} 13.8 volts OC in conjunction with the power
| switch operation
| When this terminal is grounded, the unit be-
| comes the mute mode.
Output from the receiver detector stage. Fixed
|} Output regardless of AF output or AF gain,
| NC ino connection)
| 8 volts DC is available when pin 3 is grounded.
(Relay cannot be directly actuated. Max. 5 mA)
| NC
| Ground
| NC
Input for TRVA converter control signal
| Input for TRVB converter control signal
Output reference voltage for band switching
INFUT/OUTPUT for external band switching
/ NC
| NC
a LOW BAND ANTENNA SWITCH
ah ANTENNA CONNECTOR (ANT 2}
a) CONVERTER INPUT TERMINAL
ee e
F a
oe |
| a ee
— ' - 3 ss
r
| = %
<= - = a ; - = =
&@ GROUND TERMINAL
40.
41.
42.
@y FUSE HOLDER
ag EXTERNAL
SPEAKER JACK
g% MUTE
TERMINAL
6) ACCESSORY
SOCKET
a AC POWER SOCKET
— 4 MEMORY SWITCH
FUNCTION
Input for external control (DEC signal)
NC
Input for external control (AC signal)
Output for external contral (DV signal)
Input for external control (RT signal)
Inputfoutput for external control (DB1)
Inputoutout for external control (DBZ)
Inputoutput for external control (DB4)
Inputoutput for external control (DBS)
ACC SOCKET CONNECTIONS
*s,
QOD Oe |
OODOOGA|
DOO UL ® |
(VO ®9O8®)
AC POWER SOCKET
For connection of the supplied AC power
cable,
Quitside view
FUSE HOLDER
This holds a fuse for the AC power circuit. If
the fuse is blown, replace it with a new 1A fuse
for 100/117V operation, or 0.54 fuse for 200/
220/235V operation, after checking the cause.
Open the fuse holder with a philips head (+)
screwdriver.
MEMORY SWITCH
When this switch is at the ON (up) position,
the power to the CPU of the set is supplied
continuously, even when the POWER SWITCH
on the front panel is switched OFF, in order to
retain all the operating frequencies of the two
VFO's, etc. When this switch is set to the OFF
position, all the power, including that to the
CPU, is switched OFF by switching OFF the
POWER SWITCH, so that all operating frequen-
cies of the two VFOQs, etc. are erased.