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Extracted text from shure uc2 wireless transmitter service manual (Ocr-read)
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.
Page 2
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
