Sailor T2131, T2135 Service Information
Service Information
SERVICE INFORMATION S.P. RADIO A/S - AALBORG - DANMARK 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.
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 collector 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 transmitter 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.
SAILOR. FOR GLOBAL COMMUNICATION
SERVICE INFORMATION S. P. RADIO A/S - AALBORG - DANMARK PAGE 2
JANUARY 1995 NUMBER 160
T2135T2135
T2135T2135
T2135
Modified LayoutModified Layout
Modified LayoutModified Layout
Modified Layout
28371A
TO MODULE (7) J4
J4
MODULE 12
UNIT
COMBINER
J1
5-0-26412
TR3
TR2
P1
J2
J3
ST1
J2
ST2
5-0-26414
5-0-26411
ST10
ST5
ST11
ST6
5-0-26419
526516
MODULE 11
AMPLIFIER A
POWER
J6
ST9
P11 P20P13 P22
P14
P12
5-0-26411
5-0-26419
P21
P23
526516
MODULE 11
J5
POWER
AMPLIFIER B
530703
530703
PROTECTION
UNIT
MODULE 19
P4
J1
P5
TR7
P1
P4
J1
P5
TR7
P1
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