Codan 2110 series, Руководство по ремонту, Страница: 113 / 164

Repair procedures, tests, and adjustments
Manpack Transceiver 2110 series Repair Guide 81
1
Select any transmit channel and hold down PTT for at least 30 seconds.
1
Check that the output current measures 200 mA ±20 mA.
If the current is out of the specified limit stated above, change it by adjusting the
pre-set potentiometer O/P BIAS (R105) (see
Figure 12 on page 30 ).
1
Release PTT on the handset.
1
Switch off the transceiver, disconnect the multimeter, then resolder the fuse F1–F2.
If the fuse is broken, replace it with one strand (0.2 mm TCW) taken from a piece of
7 × 0.2 mm cable. Extend the centre of the wire down from the two stakes to form a
V, ensuring it does not touch the PCB. Solder the wire to the two stakes, making sure
the solder does not run down the strand of wire (see
Figure 12 on page 30 ).
1
Reconnect the RF drive between connector J2 on the PA & Filter PCB and
connector J101 on the RF/IF & Synthesiser PCB.
1
Return to the Repair flowchart (see Figure 29 on page 95 ), if required.
Adjusting high output power
To adjust the high output power:
1
Select any frequency between 4 and 6 MHz.
1
Switch on PTT on the 0208.
1
Adjust the output level of the 0208 until the RF output power of the transceiver stops
increasing, then increase the output level of the 0208 by 3 dB.
1
Adjust HI PWR (R56) for 25 W PEP (see Figure 12 on page 30 ).
1
Check that the two-tone waveform is clean and undistorted.
If it is not clean and undistorted, further analysis is required.
1
Switch off PTT on the 0208.
1
Return to the Repair flowchart (see Figure 29 on page 95 ), if required.
PA & Filter PCB (08-06064-001) (see Figure 12 on page 30 )
NOTE
The output power is factory-set, so it is not likely to be outside the
specified limits. Check that there are no faults with the transmitter circuits
before attempting to adjust the output power.
NOTE
Equivalent readings for power meters without PEP and dB scales are
listed in
Table 16 on page 71 .