TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TAF-550 Installation & Operating Instructions
TiL 96RE187 Rev D
2-3
2.2
TFM-138B ADJUSTMENTS AND CUSTOM CONFIGURATION
Custom configuration and adjustments on the TFM-138B include; Internal enable/disable Jumper
selection, Transmitter power adjustment, Transmitter microphone level adjustment, Transmitter
side tone level adjustment, Main and Guard squelch adjustment and Transmitter deviation
adjustment. The TFM-138B wiring connections are also provided.
2.2.1 TFM-138B
Wiring
Connections
The TFM-138B Transceiver’s 15 Pin D connector is prewired for use in the TAF-550 chassis. The
following table provides the input/output signal information for each pin of this connector. The pins
numbers are stamped on the connector located on the back panel of the TFM-138B.
TABLE 2.1
TFM-138B Transceiver 15-Pin D Connections
Pin #
Description
Pin #
Description
1
600 Ohm Output
9
4 ohm Speaker Output
2
Data Output
10
4 ohm/600 ohm Output Ground
3
Panel Lighting (28VDC or 5VAC)
11
Data Input
4
Memory UP/PC Download Input
12
PC Download Input
5
Memory Down/PC Download Input
13
PTT (Ground Keying)
6
Mic Signal Input
14
Main Power +28VDC
7
Main Power +28VDC
15
Main Ground
8 Main
Ground
2.2.2
Internal Enable/Disable Jumper
The programming and direct frequency entry modes can be disabled by removing the internal
enable/disable jumper. Removal of this jumper will prevent operation on any frequencies other
than those programmed in the 120 memory positions and two guard receiver memory positions.
The TFM-138B transceiver is always shipped with this jumper in the entry enable position. To
place the jumper in the disable position, remove the TFM-138B from the TAF-550 chassis and:
(1)
Remove and retain the seven (7) No. 4-40 screws securing the bottom cover of the
transceiver to its chassis.
(2)
Remove and retain the four (4) No. 4-40 screws securing the guard receiver PCB module
in the chassis tray. Remove the guard receiver module from the chassis tray.
(3)
Remove and retain the two (2) screws securing the fuse board. Remove and retain the
five (5) screws securing the chassis tray to the main chassis. Remove the chassis tray.
(4)
You should now have access to the Microprocessor Control Unit (MCU) PCB Module
(See Figure 22). Remove the enable/disable jumper from pins 3 and 4 of J15.
(5)
Reverse steps 1 through 3 and secure all screws to re-assemble the transceiver.
