Filter Unit - Icom IC-701 Instruction Manual

negative than —3 Volts, readjust the contro! for —3 Volts
maximum negative. You will then find that the hi point
will swing positive. Up to +4 Volts is acceptable.
Tune over all bands with the tuning knob placed in the dial
fast mode and make sure the voltage at J1 PIN 5 falls
VOLTAGE
AT J1 PIN 5
ADJUSTING
POINT
L3
L3 1.8MHz 7
L7 L6 L5
21MHzZ" 14MHz © 7MHz:
within—3 to +4 Volts. If not, repeat the adjustments.
7-4-3 DISPLAY UNIT ADJUSTMENTS
Set the oscilloscope to the DC 1 to 2V/cm and connect it
to R11 and release the brake of the tuning knob. Then turn
fast the tuning knob and adjust R8 so that vertically
symmetrical waveforms are obtained. Similarly, connect
the oscilloscope to R12 and adjust R6. After adjustment,
lock the tuning knob again.
R12
Connect an oscilloscope
R11
Connect an oscilloscope
R6 Adjust waveforms
R8 Adjust waveforms
MATRIX UNIT
DRIVER UNIT—Zaem
t
LED UNIT
EF (BAND
SWITCH BOARD)
EF (CONNECTOR
BOARD)
B UNIT
EF (BT BOARD)
PLL UNIT--—— 3 a,
EF
(WIRING BOARD)
DRIVER UNIT
(LEI BOARD)
RF UNIT
EF
(HPF BOARD)
EF
(CdS BOARD)
~ : ©
QE VCO UNIT
RELAY SWITCH
UNIT
EF
(LPF BOARD)
ARS FILTER UNIT tN
a6 "ee Poem PA UNIT
\e = ALC UNIT (REG BOARD)
o e e a e PA UNIT
PA UNIT (PA BOARD)
(THERMO BOARD)