3 SERVICE T2130
3.6 ADJUSTMENT PROCEDURE
3.6.1 POWER AMPLIFIER (MODULE 1)
3.6.1.1 ADJUSTMENT OF ZERO SIGNAL CURRENT
Presettings:
a. Turn R14 and R30 fully counter clockwise.
b. Disconnect P3 (driver supply) and P2 (output transistor supply).
c. Select service programme SP-33, see chapter 3.9.1.
3.6.1.2 ADJUSTMENT OF DRIVER ZERO SIGNAL CURRENT
Connect an ammeter (F.S. 100 mA) in series with J01 and P01. Adjust R14 to a meter reading of 80 mA.
3.6.1.3 ADJUSTMENT OF THE OUTPUT TRANSISTOR ZERO SIGNAL CURRENT
Connect an ammeter (F.S. 1A) in series with J02 and P02. Adjust R30 to a meter reading of 450 mA.
NOTE! the current will be drifting the first minute or so.
3.6.1.4
After adjustment of zero signal currents connect the plugs P3 and P2.
3.6.2 ADJUSTMENT OF OUTPUT FILTER (MODULE 2)
3.6.2.1 INITIAL SETTINGS:
Select service programme SP-25, see chapter 3.9.1.
3.6.2.1 ADJUSTMENT OF SWR DETECTOR
Adjust C31 to minimum voltage on U01 pin 7 (must be less than 0.7V).
NOTE! the transmitter is only transmitting for 2 secs, then it is off for 2 secs and so on. You can only adjust
C31 when the transmitter is transmitting.
3.6.3 ADJUSTMENT OF DRIVE LEVEL
3.6.3.1 INITIAL SETTINGS:
a. Connect an oscilloscope with 1: 10 probe (50V/div) across R27 module 2.
b. Select service programme SP-25, see chapter 3.9.1.
c. Adjust input voltage to 24.00V.
3.6.3.2
By means of the buttons
FREQ
FREQ
adjust the signal, so that flat topping
just occurs on the oscilloscope.
PAGE 3-21
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