Tait TM9300/TM9400 Service Manual

Table 8.2: Spare Parts of the Graphical Control Head

Figure 8.2 illustrates an exploded view of the graphical control head, detailing the assembly of its components. The following table lists the spare parts:

Note: IPN characters 'xx' represent the issue number. Spares kits T02-00032-0001 (TM9300) and T02-00032-0002 (TM9400) include an assembled control head without the control head board, concealed microphone, and LCD assembly. The LCD seal (IPN 362-01126-xx) is part of the LCD assembly and is included in T02-00032-0004.

Table 8.3: Spare Parts of the 2-Digit Control Head

Figure 8.4 provides an exploded view of the 2-digit control head, showing the arrangement of its components. The spare parts are listed below:

Note: IPN characters 'xx' represent the issue number. Spares kit TMAA22-01 includes an assembled 2- or 3-digit-display control head without the control-head board and does not include optional parts for the concealed microphone.

Table 8.4: Spare Parts of the Hand-Held Control Head

Figure 8.5 presents an exploded view of the hand-held control head, detailing the assembly of its various components. The spare parts are listed below:

Note: For hand-held control heads other than black, a 7mm length of heat shrink (IPN 400-00020-06) is slid over each light pipe for additional light shielding.

Table 8.5: Spare Parts of the Programming Control Head

Figure 8.6 illustrates an exploded view of the programming control head, showing the arrangement of its components. The spare parts are listed below:

TOPA-SV-024 Test Unit

The TOPA-SV-024 test unit is designed to test and maintain Tait portable and mobile radios by providing an interface between the radio, a test PC, and an RF communications test set.

Figure 9.1: TOPA-SV-024 Test Unit Front Panel

The front panel of the TOPA-SV-024 test unit features controls and indicators for managing radio testing. These include a 'Portable / Mobile' switch, 'Mod Audio/Audio Tap In / Off / Mic Audio' switch, 'On Hook / Off Hook' switch, and 'Rx / Tx/PTT' switch. It also has a 'Speaker / Radio / Load' switch. The panel displays labels for various functions and connections, such as 'Computer', 'Tx Audio', 'Rx Audio / SINAD', 'Mic Audio', and 'Radio'.

9.1 Test Equipment Setup

Figure 9.2 illustrates the test equipment setup. This diagram shows how the TOPA-SV-024 test unit connects to a Test PC, RF communications equipment, and an Oscilloscope. It also details the connections to a TM9300/TM9400 radio via various connectors (e.g., RJ11 for PC, DB15 for radio, RJ45 for microphone) and specific cables. The setup includes DC power and RF input/output connections.

9.2 Operation

This section explains the function of the TOPA-SV-024 test unit controls:

Portable / Mobile Switch

This 2-way toggle switch controls attenuation resistors. When set to 'Portable', resistors are switched out. When set to 'Mobile', resistors are switched in (10:1 attenuation). Incorrect positioning may lead to inaccurate SINAD readings or damage.

Mod Audio/Audio Tap In / Off / Mic Audio Switch

This 3-way toggle switch selects audio sources: 'Mod Audio/Audio Tap In', 'Mic Audio', or 'Off' (no audio). 'Mic Audio' is typically used for normal transmit deviation tests.

On Hook / Off Hook Switch

This 2-way toggle switch simulates microphone hookswitch states. 'Off Hook' switches out a 12kΩ resistor from the microphone PTT line (simulating microphone removal). 'On Hook' switches in the 12kΩ resistor (simulating microphone placement).

9.2.1 Rx / Tx/PTT Switch

This 2-way toggle switch selects between receive ('Rx') and transmit ('Tx/PTT') modes. In 'Rx' mode, the PTT line has high impedance. In 'Tx/PTT' mode, the PTT line is pulled to ground.

9.2.2 Speaker / Radio / Load Switch

This 3-way toggle switch directs receive audio. Options are: 'Speaker' (test unit speaker), 'Radio' (radio's internal speaker), or 'Load' (dummy load R1 and R2). For mobile units, the radio's internal speaker is not disconnected when 'Speaker' or 'Load' is selected. A low-level audio signal is available at the SINAD port for all settings.

• Portable Mode: 'Speaker' activates the test unit speaker; 'Radio' activates the portable's speaker; 'Load' deactivates speakers, terminating the audio signal.
• Mobile Mode: 'Speaker' activates both test unit and mobile speakers; 'Radio' activates only the mobile speaker; 'Load' keeps the mobile speaker active.

9.3 PCB Information

9.3.1 Parts List (PCB IPN 220-01418-03)

This section lists the components for PCB IPN 220-01418-03:

9.3.2 Board Layout

Figure 9.3.2 displays the board layout for PCB IPN 220-01418-03, showing component placement on both sides of the circuit board.

9.3.3 Circuit Diagram

Figure 9.3.3 presents the circuit diagram for the calibration board (IPN 220-01418-03), detailing the schematic connections of various components, including switches, resistors, capacitors, a transformer, and connectors, illustrating signal paths for radio operation.

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