Option Installations; Opening The Receiver's Case; Cr-282 High Stability Crystal Unit; Ut-102 Voice Synthesizer Unit - Icom IC-R75 Instruction Manual

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 Remove the 2 screws from the left side of the re-
ceiver to remove an optional carrying handle, if nec-
essary.
w Remove the 4 screws from the top of the receiver
and 4 screws from the sides, then lift up the top
cover.
CR-282
HIGH STABILITY CRYSTAL UNIT
By installing the CR-282, the total frequency stability
of the receiver will be improved.
q Remove the top cover as shown in the diagram
above.
w Remove 5 screws from the PLL unit, disconnect
P1 from J491 (MAIN unit), then remove the PLL
unit.
PLL unit
UT-102
VOICE SYNTHESIZER UNIT
The UT-102 announces the received frequency,
mode, S-meter level and current time in a clear, elec-
tronically-generated voice, in English (or Japanese).
Push [LOCK] for 2 sec. to announce the frequency,
etc.
q Remove the top cover as shown above.
w Remove the protective paper attached to the bot-
tom of the UT-102 to expose the adhesive strip.
e Plug UT-102 into J1271 on the MAIN unit as
shown at right.
r Return the top cover to its original position.
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e Remove the 2 screws from the bottom of the re-
ceiver, slide the cover backward, then remove the
bottom cover.
e Remove the supplied internal crystal and replace
with the CR-282.
r Adjust the reference frequency at L2 using a fre-
quency counter.
t Return the PLL unit and top cover to their original
positions.
Connect a frequency counter
here and adjust the frequency
to 60.00000 MHz.
CR-282
Internal
crystal
L2
PLL unit
MAIN unit