Digital Display Calibration; Optional 10 Hz Display Resolution; Cw Zero Beat Frequency Selection - Kenwood TS-440S Instruction Manual

5-8-3. Digital display catibration
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. Removing the top cover, filter unit cover and the
bottom covers from radio, and place the radio on
its side with the antenna tuner area down.
. Remove the two screws that secure the rear of the
IF unit to the chassis and raise the IF unit up
towards the front panel. Connect the two pin end
of the supplied calibration cable to connector num-
ber 8 on the PLL unit, as shown in the figure.
. Connect the single pin end of the cable to the CAL
terminal pin that is located along the back edge of
the RF unit, near the iarge shielded area.
. Connect your antenna and tune to WWV.
. Using a small flat bladed screwdriver adjust trim-
mer capacitor TC1, near connector 8 of the PLL
unit, for zero beat. Zero beat is the point where the
two audio tones are oscillating at the slowest rate.
2 a Bhd
PLL unit
Rear panel
PLL unit
5-8-4. Optional 10 Hz display resolution
If you would like 10 Hz resolution instead of the sup-
plied 100 Hz display resolution, cut D66 as shown on
the Control unit.
. Remove the top and bottom covers from the radio.
. Remove the countersink screws (2 on each side)
that secure the front panel ta the chassis and gently
pull the front panel forwards.
. Remove the 5 small round head screws that secure
the shield plate (2 on the top and 3 on the bottom)
to the front panel, and remove the shield plate.
4. Cut the lead of diode D66 located below the dip
switch on the control unit.
5. Reverse steps 1.3. to reasemble the radio.
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Notes:
+. When reassembling the radio make sure that you
de not cut or pinch any wires between the chassis
and front panel!
2, Do not alter the settings of the dip switch. They
are factory adjusted, and damage or misoperation
may result.
6s
Control 'unit
5-8-5. CW zero beat frequency selection
You may select between 800 Hz and 400 Hz zero beat
adjustments in the CW mode by cutting diode D73 on
the control unit.
. Remove the top and bottom covers from the radio.
. Remove the countersink screws (2 on each side}
that secure the front panel to the chassis and gently
pull the front panel forwards.
. Remove the 5 small round head screws that secure
the shield plate (2 on the top and 3 on the bottom)
to the front panel, and remove the shield plate.
4, Cut the lead of diode D73 located below the dip
switch on the control unit.
. Reverse steps 1.—3. to reassemble the radio.
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Notes:
1. When reassembling the radio make sure that you
do not cut or pinch any wires between the chassis.
and front panel!
Do not alter the settings of the dip switch. They
are factory adjusted, and damage or misoperation
may result.
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