Shure uc2 wireless transmitter service manual
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Page 1
1999, Shure Incorporated Printed in U.S.A. 25C1044 (TK) Service Manual UC2 Hand-Held UHF Transmitter 25C1044 (TK) Characteristics General The Shure UC2 Hand-Held UHF Transmitter is a microprocessor- controlled microphone transmitter, operating in the 692 to 716 MHz and 774 to 862 MHz frequency range. The UC2 hand-held transmitter is used in mid-level installed sound, rental, and concert sound applications. Six frequency range variations are available. Controls and Connectors 1. Mic Cartridge Grille (87 shown) 2. Battery Fuel Gauge LEDs 3. Power ON/OFF Switch 4. Audio Gain Control5. 9 V Battery 6. Battery Cup 7. Group Selection Rotary Switch 8. Channel Selection Rotary Switch Figure 1.UC2 Controls and Connectors 1 2 3 4 8 7 5 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 com- munications authorities.
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Shure UC2 Hand-Held UHF Transmitter 2 Characteristics 25C1044 (TK) Circuit Description CONTROL PLL CONTROL MCU EEPROM (MEM) PWR. OFF DETECT +5V REG. GROUP CHANNEL SYNTH. RF POWER RF MUTE RF MUTE VCO FROM BATT. UNREG. PWR. +5v AUDIO IN PWR. HOLD CIRCUIT ON / OFF SWITCH FET BYPASS TONE KEY CIRCUIT Σ TONE CONTROL TONE KEY CALL ID BATTERY MGMT. & FUEL GAUGE AUDIO OUT LIMITER CONTROL OUTPUT LIMITER CONTROL INPUT MIC Figure 2.UC2 Hand-Held Transmitter Circuit Block Diagram 32.768 kHz 4 MHz 4 MHz MB15A02MC68HC705 Audio Section FCC-Approved Audio enters L200, an inductor used as an rf choke. The signal is ac coupled through capacitor C200 into a user adjustable gain stage. Resistors R202 and R203 set up a half-supply bias, and R204 sets the input impedance for the stage. The back-to-back diodes, D201, are used to keep the op-amp from snapping to the rail and reverse phasing when the maximum input volt- age range is exceeded. The 30 dB adjustable gain stage is built around U200A. The user externally controls the gain of this stage. C206, C207, and C208 protect