
3 - 2
CR-293
HIGH STABILITY CRYSTAL UNIT
A temperature-compensating crystal with a stability of
± 3 ppm is built-in to the receiver. For more demand-
ing operation, the CR-293
HIGH STABILITY CRYSTAL
UNIT
is available. It has a stability of ± 0.5 ppm.
q
Remove the bottom cover as shown on p. 37.
w
Remove 6 screws from the metal plate, then
remove the metal plate and shield cover.
e
Remove 10 screws from the PLL unit, then open
the unit to expose the bottom.
r
Unsolder the feet of the internal crystal unit, then
remove it.
t
Place the CR-293 in the space available as shown
in the diagram, then solder its feet into place (6
points).
y
Adjust the reference frequency using a frequency
counter.
u
Replace the ground spring to its original position.
i
Return the shield cover, metal plate and bottom
cover to their original positions.
NOTE:
The CR-293 is an oven-type crystal unit,
and the specified frequency stability described
above is guaranteed 1 min. after power ON.
Shield
cover
PLL unit
Ground
spring
PLL unit
CR-293
Internal
crystal
unit
Metal plate
Содержание iC- r8500
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Страница 52: ...Replacement page Jan 2011 5 6 MAIN A UNIT CP2 Noise blanker check point...
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Страница 220: ...4 1 SECTION 4 CIRCUIT DESCRIPTION UNIT NAME MAIN MAIN A RF A RF C RF B RF D MIX MIX A CONV CONV B PLL PLL B...
Страница 221: ...4 2 UNIT NAME MAIN MAIN A RF A RF C RF B RF D MIX MIX A CONV CONV B PLL PLL B...
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Страница 229: ...4 10 UNIT NAME MAIN MAIN A RF A RF C RF B RF D MIX MIX A CONV CONV B PLL PLL B...
Страница 230: ...5 1 SECTION 5 ADJUSTMENT PROCEDURE MAIN A PLL B PLL B MAIN A...
Страница 231: ...5 2 PLL B MAIN A...
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