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Service Information
SAILOR.
JANUARY 1995
SAILOR TRANSMITTER T2131 AND T2135 ERROR 83
We have noted an increased error rate as regards error 83, too low output power.
The Reason; for this error is either the drive level being too high or overload of the power amplifier.
Both of these conditions result in excess voltage in the power amplifier. This causes the
power supply to reduce the voltage, which creates a reverse voltage over the basis col-
lector diode in the output transistors resulting in a short circuit.
The Solution; A protection circuit has been developed, which adjust the drive level to the voltage in
the amplifier. This circuit "Protection Unit Module 19" is mounted. Furthermore, the trans-
mitter is calibrated as described in Chapter 3, "Calibration", in the Service Manual.
Mounting;
The existing cable 526917 between the power amplifier and the connection board is dis-
mounted and replaced by 730142, protection unit with cables. Please see the enclosed
diagram and outline.
Spares;
Protection Unit Module 19 can be ordered free of charge at S.P. Radio A/S in return for
information about the transmitter's serial number. The S.P. number is 730142.
If you should have any questions in relation to the above, please do not hesitate to contact the service
department at S.P. Radio A/S, Phone; +45 96 34 61 00 or fax; +45 96 34 61 01.
SERVICE INFORMATION
FOR GLOBAL COMMUNICATION
S.P. RADIO A/S - AALBORG - DANMARK
NUMBER 160
PAGE 1
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Summary of Contents for Sailor T2131
- Page 1 JANUARY 1995 NUMBER 160 SAILOR TRANSMITTER T2131 AND T2135 ERROR 83 We have noted an increased error rate as regards error 83, too low output power. The Reason; for this error is either the drive level being too high or overload of the power amplifier.
- Page 2 JANUARY 1995 NUMBER 160 T2135 T2135 T2135 T2135 T2135 Modified Layout Modified Layout Modified Layout Modified Layout Modified Layout COMBINER UNIT MODULE 12 POWER POWER AMPLIFIER A AMPLIFIER B MODULE 11 MODULE 11 TO MODULE (7) J4 5-0-26412 PROTECTION UNIT MODULE 19 5-0-26414 28371A...
- Page 3 JANUARY 1995 NUMBER 160 T2135 Previous Layout COMBINER UNIT MODULE 12 POWER POWER AMPLIFIER A AMPLIFIER B MODULE 11 MODULE 11 TO MODULE (7) J4 5-0-26412 To be removed 5-0-26411 5-0-26411 5-0-26414 28371-SE SERVICE INFORMATION S. P. RADIO A/S - AALBORG - DANMARK PAGE 3...
- Page 4 JANUARY 1995 NUMBER 160 T2131 Modified Layout 60.100 POWER AMPLIFIER MODULE 11 5-0-26411 TO MODULE 7 J4 PROTECTION UNIT MODULE 19 5-0-26413 28372B SERVICE INFORMATION S. P. RADIO A/S - AALBORG - DANMARK PAGE 4...
- Page 5 S.P. RADIO A/S • PORSVEJ 2 • DK-9200 AALBORG SV • DENMARK PHONE INT. +45 96 34 61 00 • TELEX 69 789 SPRAD DK • TELEFAX INT. +45 96 34 61 01 E-MAIL: SAILOR@SAILOR.DK • WEB: WWW.SAILOR.DK SERVICE INFORMATION S.
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