Icom IC-M604A Instruction Manual

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559CONNECTIONS AND MAINTENANCE9e Install an optional unit to J3 on the AF board as shownbelow.J3AF boardOptional unitr Reconnect the cables, and reassemble the unit to itsoriginal confi guration.CAUTION:• When re-assembling the case and tightening thescrews, you must keep the specified torque (0.7 N.m).Otherwise the transceiver may be damaged (torque toohigh) or lose waterproof effi ciency (torque too low).• When unistalling the optional unit, remove it vertically.Wiggling the unit from side to side may damage theconnector.■ HM-157/HM-162 installationHM-157 HM-162The optional HM-157 can be connected to the transceiver di-rectly, as well as using the supplied connection cable for longerdistance remote operation. The connector of the connectioncable can be installed into a cabinet, wall, etc., as a built-in plug.• The optional HM-162 should be installed to the transceiver usingthe supplied connection cable.For longer distance remote operation, the optional extensioncable, OPC-999/OPC-1541* (6 m; 20 ft/connecting betweentransceiver and the connection cable), is available, and up totwo OPC-999/OPC-1541* can be added.* OPC-999 : For the HM-157OPC-1541 : For the HM-162Do not connect the HM-157 to the OPC-1541, and theHM-162 to the OPC-999/OPC-1000.