Icom IC-746 - What Are the Pin-Outs on the ACC-2 Connector; Does Audio to Pin 4 of ACC-1 Trigger the VOX; Where Can I Get Replacement Power Connectors

IC-746 FAQ
8.5 What are the pin-outs on the ACC-2 connector?
Page 72 of the Instruction Manual has the full scoop. Here is a brief description.
1 8 V < 10 ma at 8 V dc (+/- 0.3 V)
2 GND Connected directly to pin 2 on ACC-1
3 HSEND Connected directly to pin 3 on ACC-1
4 BAND Band output voltage
Varies from 0 to 8 V dc
7.5 V 160m
6.1 V 80m
5.1 V 40m
0 V 30m
4.1 V 20m
3.2 V 17m/15m
2.2 V 12m/10m
1.9 V 6m/2m
5 ALC Connected directly to pin 5 on ACC-1
6 VSEND Input/Output for VHF
When grounded, transmits
Goes to ground when transmitting
Ground level: -0.5 to 0.8 V dc
Output current: < 20 ma
Input current: < 200 ma
7 13.8 V Connected directly to pin 7 on ACC-1
8.6 Does audio to pin 4 of ACC-1 trigger the VOX?
No. Pin 4 of ACC-1 does not trigger the VOX circuitry, nor is the level of that input affected
by the front panel mic gain control.
8.7 Where can I get replacement power connectors?
Obvious Solution
The connector you need is often called an "OEM-T" connector. You can order Icom part
number OPC-025A or OPC-025D from any of the major ham equipment retailers for a pre-
wired cable.
Icom's cable compatibility chart lists the OPC-025A. Most retailers sell the OPC-025D.
Both apparently work. The OPC-025A is rated for 20 amps, while the OPC-025D is rated for
30 amps. Most hams prefer the beefier cables.
Page 92 of 113
2003-02-08