Icom IC-9700 Service Manual Addendum page 82

● REAR panel (2)
[ACC]
• 8-pin
[ACC]
PIN PIN
ACC
No. NAME
1 RTTY
2 GND
3 SEND
8-pin
2
4 5
1 3
8
6 7
4 MOD
Rear panel
view
AF/IF
5
(IF=12 kHz)
6 SQL S
7 13.8 V
8 ALC
* 1
When the SEND terminal controls an inductive load, such
as a relay, a counter-electromotive force can malfunction
or damage the transceiver.
To prevent this, we recommend adding a switching diode,
such as an 1SS133, on the load side of the circuit to
absorb the counter-electromotive force.
When the diode is added, a delay in relay switching may
occur.
Be sure to check its switching action before operating.
(Example) ACC socket
e SEND
u 13.8 V
Relay
Switching diode
DESCRIPTION
Controls RTTY keying.
Connects to ground.
An external unit controls
the transceiver.
When this pin goes to
ground, the transceiver
* 1
Input/output pin.
transmits.
The pin goes low
when the transceiver
transmits.
Modulator input.
Connects to the internal modulator circuit.
Fixed AF detector or receive IF (12 kHz)
3
*
signal output.
Squelch output.
This pin goes to ground when the
squelch opens (TX/RX indicator lights
green).
13.8 V output when power is ON.
ALC voltage input.
To a non-Icom
linear amplifier
High level:
Low level:
Current flow:
Input voltage (RX): 2.0 ~ 20.0 V
Input voltage (TX):
Current flow:
Output voltage (TX): Less than 0.1 V
Current flow:
Input impedance:
Output level:
Output impedance: 4.7 kΩ
Output level:
SQL open:
SQL closed:
Output current:
Input level:
Input impedance:
* 2
The MOD input level is adjustable in the MENU.
100 mV rms is at 50% as the default.
MENU » SET > Connectors > ACC MOD Level
* 3
The AF/IF (IF=12 kHz) settings are selectable to output a
12 kHz IF signal in the MENU. In that case.
MENU » SET > Connectors > ACC Output Select
* 4
The AF/IF (IF=12 kHz) output level is adjustable in the
MENU.
Approximately 200 mV rms is at the 50% as the default.
MENU » SET > Connectors > ACC IF Output Level
3-3
SPECIFICATIONS
More than 2.4 V
Less than 0.6 V
Maximum 2 mA
–
−0.5 ~ +0.8 V
Maximum 20 mA
Maximum 200 mA
10 kΩ
Approx. 100 mV rms
4
*
100~300 mV rms
Less than 0.3 V/5 mA
More than 6.0 V/100 μA
Maximum 1 A
−4 ~ 0 V
More than 10 kΩ
* 2