TM-481A
24
ADJUSTMENT
Common Section
Item
Condition
Measurement
Adjustment
Specifi cations / Remarks
Test-
equipment
Unit
Terminal
Unit
Parts
Method
1. Setting
1) Power supply voltage
DC power supply terminal
:
13.8V
2. All LCD
segments
light check
and full reset
1) All LCD segments light check
Turn the transceiver power ON by pressing the power switch while [F] key is
pressed. While the [F] key is pressed, all LCD segments light.
2) Full reset
After confi rming that all LCD segments have lighted described in the step 1
above, release the [F] key, “FL.RST?” appears on the display.
Press the [F] key, “SURE ?” appears on the display.
Press the [F] key again to perform the full reset.
Note:
When you do not want to remove data such as memory channel data, save
the data using the MCP-1A (Memory control program) before performing the
full reset, then write the data to the transceiver after performing the adjust-
ment.
Confi rm that all LCD segments light.
3. VCO Lock
voltage
RX
1) Frequency: 46
9
.
9
50MHz
DVM
TX-RX
(A/2)
CV
TX-RX
(A/2)
TC2
5.5V
±0.1V
2) Frequency: 400.050MHz
Check
0.5V or more
TX
3) Frequency: 46
9
.
9
00MHz
4) Transmit
TX-RX
(A/2)
TC1
5.5V
±0.1V
5) Frequency: 400.100MHz
6) Transmit
Check
0.5V or more
Transmitter Section (Refer to the Table 1 on page 22 for the frequencies which will apply in the adjustment mode.)
Item
Condition
Measurement
Adjustment
Specifi cations / Remarks
Test-
equipment
Unit
Terminal
Unit
Parts
Method
1. Frequency
1) Adj item: [FRQ.]
Adjust:
[
ᲤᲤ
]
2) Transmit
f. counter
Rear
panel
ANT
Front
panel
Tuning
control
Write
435.100MHz±100Hz
2. High power
[Low]
1) Adj item: [HPL .]
Adjust:
[
ᲤᲤ
]
2) Transmit
Power
meter
45W±1W
[Low’]
3) Adj item: [HPL1.]
Adjust:
[
ᲤᲤ
]
4) Transmit
[Center]
5) Adj item: [HPC .]
Adjust:
[
ᲤᲤ
]
6) Transmit
[High’]
7) Adj item: [HPH1.]
Adjust:
[
ᲤᲤ
]
8) Transmit
[High]
9
) Adj item: [HPH .]
Adjust:
[
ᲤᲤ
]
10) Transmit
