Opc-1939/opc-2078 cut off the bushing as in the illustration. 2) unscrew 4 screws, then remove the bottom cover.
3) remove 2 screws f.Ĥ - 1 section 4 optional cable installation install optional opc-1939/opc-2078 as follows: 1) turn off the power, and then disconnect the dc power cable. 2) disconnect the fl at cable and speaker cable. Disassembly instruction flat cable bottom cover screw×4 front panel speaker cable unsolder solder remover main unit main unit chassis main unit screw×9 1) remove 4 screws from the bottom cover, and then remove it.
front unit cpu (ic51) lcd driver (ic6) mic amp (ic7) mic gain sw (ic53) eeprom (ic52) clock frequency shift diode (d60) cpu clock (x51) backlight sw (q5) dimmer controller (q2) mic amp frequency response sw (ic54) backlight led driver (q1).intermediate frequency : 1st if 46.35 mhz, 2nd if 450 khz.squelch sensitivity (at threshold) :, 0.25 µv typ.number of conventional channels : 128 ch (8 zones).Table of contents section 1 specifications section 2 inside views section 3 disassembly instruction section 4 optional cable installation section 5 circuit descripiton 5-1 receiver circuits.ġ - 1 section 1. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than the specified voltage. This service manual describes the latest technical information for the ic-f5121d, ic-f5122d and ic-f5123d vhf transceivers, at the time of publication.