Shure uc1 wireless transmitter service manual
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Extracted text from shure uc1 wireless transmitter service manual (Ocr-read)
Page 1
2000, Shure Incorporated Printed in U.S.A. 25C1043 (TK) Service Manual 25C1043 (TK) UC1 / UC1L Body-Pack Transmitter Characteristics General The Shure UC1/UC1L Body-Pack Transmitter is microprocessor- controlled, operating in the 692–716 MHz and 774–862 MHz frequency ranges. The UC1/ UC1L is used in mid-level installed sound, rental, and concert sound applications. Six frequency range variations are available. Controls and Connectors 1 2 3 1. Antenna 2. Power/Battery Fuel Gauge LEDs 3. Power ON/OFF Switch 4. Input Connector 5. Rf/Audio Mute Switch Input Connector 6. Input Attenuation Control7. Audio Gain Control 8. Group Rotary Switch 9. Channel Rotary Switch 10. Battery Compartment 11. Battery Cover Release Tabs 12. Battery Compartment Cover Figure 1.UC1 Controls and Connectors 4 5 10 11 12 7 8 9 6 Service Note: Shure recommends that all service procedures be performed by a Factory- Authorized Service Center or that the product be returned directly to Shure Brothers Inc. Licensing: Operation may require a user license. Frequency or power-output modifications may violate this products approvals. Contact your countrys communications authorities.
Page 2
Shure UC1 Body-Pack UHF Transmitter 2 Circuit Description 25C1043 (TK) Circuit Description CONTROL PLL CONTROL MCU EEPROM (MEM) OFF / MUTE DETECT +5V REG. REMOTE MUTE GROUP CHANNEL SYNTH. RF POWER RF MUTE RF MUTE VCO FROM BATT. UNREG. PWR.+5v AUDIO IN PWR. HOLD CIRCUIT MIC. / INSTR. ON / OFF SWITCH FET BYPASS TONE KEY CIRCUIT Σ TONE CONTROL TONE KEY CALL ID BATTERY MGMT. & FUEL GAUGE AUDIO OUT MIC. / INSTR. LIMITER CONTROL OUTPUT LIMITER CONTROL INPUT Figure 2.UC1 Circuit Block Diagram Audio Section Domestic Models The audio signal enters the audio board at J204, pin 1. The signal then enters a switchable 20 dB pad made up of SW203, R203, R204, C204, and C206. The back-to-back diodes, U206, are used to keep the op-amp from snapping to the rail and reverse-phasing when the maximum input voltage range is exceeded. The signal is ac-coupled through C205 into a 40 dB (30 dB for J frequencies) user-adjustable gain stage around amplifier U2. This gain stage is externally accessible to the user. Due to its topology, it is a unique stage because it is non-inverting and allows for a gain less than unity. Resistors R205 and R207 set up a half-supply bias, and R206 sets the ac input impedance. The amplified audio signal then passes through a pre-emphasis network before entering the compression stage. R221, R222, C215, and C216 set up two corners for the pre-emphasis network. The pre- emphasis network feeds the NE575 compander, U203, which utilizes