Cobra 19xs Service Manual

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Cobra 19XS Service Manual
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Cobra 19xs Specifications

General

RF Power Output	4 Watts
Modulation	AM
Frequency Range	26.965-27.405 MHz
Channels	40
Speaker	Built-in
Battery	Not applicable (requires external power source)

Summary

Parts Layout

Component Side Layout

Diagram showing component placement on the top side of the circuit board.

Pattern Side Layout

Diagram illustrating the circuit traces and copper patterns on the bottom side of the PCB.

P.C.B. Wiring Diagram

Wiring Diagram (Chassis and Microphone Pins)

PLL Block Diagram

Block Diagram

Integrated Circuits and Components

Transistor Identification

Visual identification of common transistors used, including pinouts and package types.

Diode Identification

Visual identification of common diodes, including markings and package types.

LC7131 Internal Diagram

Internal block diagram of the LC7131 PLL IC, detailing its functional modules and connections.

ANIO3 Circuit Schematic

Detailed internal circuit schematic for the ANIO3 integrated circuit, showing transistor-level connections.

KIA7217AP Circuit Schematic

Internal circuit diagram for the KIA7217AP IC, illustrating its transistor-level connections and internal structure.

Test Equipment Setup Guides

PLL and Carrier Section Testing

Diagram for setting up test equipment to diagnose the PLL and carrier sections.

Receiver Section Testing

Diagram for configuring test equipment for receiver section diagnostics.

Transmitter Section Testing

Diagram for setting up test equipment for transmitter section diagnostics.

Voltage Measurement Chart

Transistor Voltage Readings

Table of voltage measurements for transistors under specific operating conditions.

IC Pin Voltage Readings

Table detailing voltage measurements for integrated circuit pins in different modes.

Exploded View Diagram

Exploded View Parts List

Mechanical Parts List

Electrical Parts List