Transmitter Adjustment - Icom IC-706 Service Manual

RECEIVER ADJUSTMENT
(CONTINUED)
MEASUREMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITIONS VALUE
POINT
UNIT LOCATION UNIT
ADJUST
RECEIVER 1 • Displayed frequency: 14.1000 MHz
Rear Connect an AC millivolt- 30 dB of AF level MAIN R401
TOTAL GAIN
• Mode
USB
panel meter to [EXT SPJ jack difference
• [P.AMP/ATT)
OFF
with an 8
Q
dummy load.
• Connect a standard signal generator to
[ANT 1J and set as:
Frequency: 14.1015 MHz
Level
0.5 mV • (-53 dBm)
and OFF
Modulation: OFF
WFM
1 • Displayed frequency:
80.00000 MHz
MAIN Connect a digital multi- 4.0V MAIN L63
RECEIVING
• Mode
: WFM
meter or oscilloscope to
• Connect a standard signal generator to
CP1.
[ANT 2] and set as:
Frequency: 80.00000 MHz
Level 0.5 mV • (-53 dBm)
• Receiving
NOISE 1 • Displayed frequency: 14.10000 MHz
MAIN
Connect an oscilloscope
Maximum MAIN
L61.L64
BLANKER
• Mode
:
USB
to CP2. voltage
• [M3NB]
: OFF
• [P.AMP/ATT)
: Preamp
• R126 (MAIN unit): Center
• Connect a standard signal generator to
[ANT lJ and set as:
Frequency: 14.1015 MHz
Level :
1.8 ltV • (-82 dBm)
~3NB]
ON
Noise just R126
reduces.
S-METER See p. 4-9 METER ADJASTMENT
• This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
4-4 TRANSMITTER ADJUSTMENT
MEASUREMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITIONS VALUE
POINT
UNIT LOCATION UNIT ADJUST
IDLING
1 • Displayed frequency:
14.10000 MHz
Rear Connect a DC ammeter 1 A increase PA R6
CURRENT
• Mode
USB
panel
between the DC power
from that R6 is in
(for drive
• [Q2 MIC GAIN]
: 1 (minimum)
supply and transceiver's max.
amplifiers) • R6 (PA unit)
: Max. counterclockwise
DC power socket. counterclockwise
u u . . . . . . . . . . • • • • • • • • • • • • • • •
I--
• R52 (PA unit)
: Max. counterclockwise
(for final
2 • R59 (PA unit)
: Max. counterclockwise
0.5 A increase R52
amplifiers)
• Transmitting
from step 1
I--
3 0.5 A increase R59
from step 2
SWR 1 • Displayed frequency: 14.10000 MHz
Rear
Connect an RF power l00W
Quick Q2
DETECTOR
• Mode
USB
panel meter to [ANT 1] set MICGAIN
• Ground pin 11 of Jl0 (MAIN unit).
connector. mode
• Connect an audio generator to [MIC]
-
connector and set as:
2
10 mV /1.5 kHz
MAIN Connect a digital multi- Minimum voltage FILTER C58
• Transmitting
meter to pin 1 of J7.
After adjustment, remove the jumper wire from
J
10.
4-4