Tft Lcd And Fm-Tv Unit Adjustment - Icom IC-R3 Service Manual

5-4 TFT LCD AND FM-TV UNIT ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITION
LCD LIGHT 1 • Displayed frequency :
ON
• Mode
• Push and hold [FUNC] key, and
then push [Y] or [Z] key.
1
DC-DC • Displayed frequency :
VOLTAGE
• Mode
• Receiving
1
VIDEO • Displayed frequency :
SYNCHRO-
NOUS • Mode
• Receiving
OSD 1 • Displayed frequency :
FREQUENCY
• Mode
• Receiving
FM-TV 1 • Remove the FM-TV unit.
FREQUENCY • Solder CP2 to short the junction
([OTH-2] only) point (as shown next page).
• Connect a 5 V power supply to
the [FMTV5] terminal (J1, pin 2)
• Connect an SSG to the [IFIN] ter-
minal on the PCB and set as :
Frequency : 426.05 MHz
Level
Modulation : OFF
• Receiving
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
UNIT
Front
2 channel panel
:
TV mode
LOGIC
2 channel
:
TV mode
LOGIC
2 channel
:
TV mode
Front
2 channel panel
:
TV mode
FM-TV
: 1 mV (–47 dBm)
*
MEASUREMENT
LOCATION
Display
Connect the digital
voltmeter to the
check point 5V.
Connect the oscillo- Set the waveform as
scope to the check below
point CP1.
Display Set the same space
both left side and right
side on the display as
below
Connect the digital
voltmeter to the
CP2.
5 - 7
ADJUSTMENT
VALUE
UNIT
The LCD lights ON
5.1 V LOGIC
LOGIC
same width
LOGIC
sample display
same width
1.5 V FM-TV
POINT
ADJUST
Verify
R805
R902
C935
L2