Icom IC-R75 Instruction Manual - Page 38

10 OPTION INSTALLATIONS ■ Opening the receiver's case Follow the case and cover opening procedures shown here when you want to install an optional unit or adjust an internal unit, etc. CAUTION: DISCONNECT the DC power cable from the receiver before performing any work on the receiver. Otherwise, there is danger of electric shock and/or equipment damage. q R emove the 2 screws from the left side of the receiver to remove an optional carrying handle, if necessary. w R emove the 4 screws from the top of the receiver and 4 screws from the sides, then lift up the top cover. e R emove the 2 screws from the bottom of the receiver, slide the cover backward, then remove the bottom cover. ■ CR-282 h igh stability crystal unit By installing the CR-282, the total frequency stability of the receiver will be improved. q R emove the top cover as shown in the diagram above. w R emove 5 screws from the PLL unit, disconnect P1 from J491 (MAIN unit), then remove the PLL unit. PLL unit e R emove the supplied internal crystal and replace with the CR-282. r A djust the reference frequency at L2 using a frequency counter. t R eturn the PLL unit and top cover to their original positions. CR-282 Connect a frequency counter here and adjust the frequency to 60.00000 MHz. Internal crystal L2 PLL unit MAIN unit ■ UT-102 v oice synthesizer unit The UT-102 announces the received frequency, mode, S-meter level and current time in a clear, electronicallygenerated voice, in English (or Japanese). ➥ P u s h [ L O C K ] fo r 2 s e c . t o a n n o u n c e t h e frequency, etc. q R emove the top cover as shown above. w Remove the protective paper attached to the bottom of the UT-102 to expose the adhesive strip. e P lug UT-102 into J1271 on the MAIN unit as shown at right. r R eturn the top cover to its original position. 34