technical manual for sailor compact hf ssb t2130 - Gopher Proxy

3 SERVICE T2130
3.4.1 POWER AMPLIFIER (MODULE 1)
Connect a 50 ohm load to RF in/out (ST04) on the Connection Board (6).
3.4.1.1 ERROR 71. VFORWARD LOW
This means that there is no output from the PA-module.
Select service programme SP-29, see section 3.9.1.
3.4.1.2
Check the RF-input level on the PA-module (1).
Approx. 1.2 Vpp.
3.4.1.3
Check the RF-output level on the PA-module (1).
Approx. 200 Vpp.
3.4.1.4
Check of bias. Note only when the output is zero. See chapter 3.6. ADJUSTMENT PROCEDURE,
sections 3.6.1.1 to 3.6.1.4.
3.4.1.5
If the measurement above is ok, then the fault is probably to be found in the Output Filter (2).
3.4.1.6 ERROR 74. TRANSMITTER TEMPERATURE HIGH
The temperature on the output transistors is too high.
3.4.1.7
Check that there are free air circulation around the transmitter and the ambient temperature is not more
than 40°C. If the temperature is higher the performance will be reduced.
3.4.1.8
Check R45 (temperature sensor) located on one of the screws holding Q10 (see component location for
Power Amplifier (1) in chapter 5.1). When it is 25°C the resistance is 2.00 Kohm.
3.4.1.9
Check if the output transistors have a good thermal contact to the heatsink.
IMPORTANT! Always use thermal compound for the power transistors. (e.g. Wakefield part No.
120-8 or equivalent).
PAGE 3-5