Shure T1 Service Manual
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Shure T1 Service Manual

Wireless body-pack transmitter
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SERVICE MANUAL CHANGE NOTICE
T1/TC1 WIRELESS BODY-PACK TRANSMITTER
Changes and corrections have been made to the Service Manual for the T1 Body-Pack Transmitter. To up-
date your Service Manual, remove the pages identified in the tables below and replace them with the pages
attached to this Change Notice. Note that there are no changes to pages not specifically identified in the
tables below.
T1 BODY-PACK TRANSMITTER SERVICE MANUAL REVISION HISTORY
Release
Original
Revision 1
Revision 2
Revision 3
Revision 4
Revision 5
Revision 6
CHANGES EFFECTIVE
these pages from the
T1 Service Manual
Page 22
E1999, Shure Incorporated
25–1016–1 (CC)
Part Number
25A1016
25B1016
25C1016
25C1016
25C1016
25C1016
25C1016
MARCH 17, 2003
REMOVE
Shure Incorporated
222 Hartrey Avenue
Evanston IL 60202-3696 U.S.A.
T Wireless System
Date Code
QH
SB
SI
TL
AF
BA
CC
these new Revision pages into the
T1 Service Manual
Color
White
Pink
White
White
White
White
Red
INSERT
Page 22
Printed in U.S.A.

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Summary of Contents for Shure T1

  • Page 1 SERVICE MANUAL CHANGE NOTICE T1/TC1 WIRELESS BODY-PACK TRANSMITTER Changes and corrections have been made to the Service Manual for the T1 Body-Pack Transmitter. To up- date your Service Manual, remove the pages identified in the tables below and replace them with the pages attached to this Change Notice.
  • Page 2 3. Tini “ ” (Lavalier, headset, WA302 input) 4. Lavalier microphone Service Note: Shure recommends that all service procedures be performed by a factory-authorized service center or returned directly to Shure Brothers Inc. Licensing: Operation may require a user license. Frequency or power-output modifications may violate this product’s approvals.

  • Page 3: Circuit Description

    Pin 2: Supplies regulated 5 Vdc bias for electret condenser mi- crophones Pin 3: Audio input Pin 4: 20 kΩ load resistor connected to pin 3 for Shure electret microphones Preamplifier Stage: This is centered in one section of the operation- al amplifier (U102C).

  • Page 4: Tuned Circuits

    Shure T1 Body-Pack Transmitters L209, diode D201, capacitor C214, and capacitor divider C224 and C230. Frequency and Temperature Stability: To ensure frequency sta- bility despite changes in the battery voltage, regulated 5 Vdc bias is ap- plied to the varactor diode and to the base of Q201. Temperature com- pensation is provided by C224, C230, and C214.
  • Page 5 Shure T1 Body-Pack Transmitters Antenna: This is a quarter-wavelength, permanently attached, flex- ible wire. The ground plane of the circuit serves as an untuned counter- poise capacitively coupled to the body of the user. Spurious Emissions: To minimize the production and radiation of...

  • Page 6: Preliminary Tests

    Shure T1 Body-Pack Transmitters Preliminary Tests Listening Tests Before disassembling the unit, operate it to determine whether it is functioning normally. Focused Testing: First and most important: Review any customer complaint or request and focus your listening and functional tests on any reported problem.
  • Page 7 2. Unmute the transmitter and turn its gain to the minimum setting. Connect an input cable as follows: T1 and T1G: Use adapter cables to input the audio to the body- pack input. T1P: Disassemble the case, remove the microphone, and attach the adapter cable to the four-pin header of the audio input.

  • Page 8: Disassembly And Assembly

    (If you have trouble separating the case, carefully slit the label covering the case separation inside the battery compartment.) Reassembly Reassemble the T1 Transmitter as follows: 1. Presenter transmitter only: Plug the lavalier microphone connector into J104.

  • Page 9: Parts Needed

    Shure T1 Body-Pack Transmitters Converting a to a T1 Because direct replacements for the lavalier microphones used in are no longer available, the best way of replacing the micro- phones in these earlier units is to replace the lavalier header with a male...

  • Page 10: Service Procedures

    Shure T1 Body-Pack Transmitters Service Procedures Reference Material The Shure Wireless Systems: T Series User’s Guide provides a de- scription, information on operation and troubleshooting, and technical data. Special Equipment The Wireless Service Equipment manual covers the standard items needed for servicing the transmitters. If you do not have the modified 4 receiver described there, you will need an appropriate receiver (usu- ally T3 or T4) to verify that the transmitter is working properly.

  • Page 11: Changing The Frequency

    202.200 208.200 Changing the Frequency The operating frequency of the T1 transmitter may be changed with- in a specific group by changing the crystal on the pc board. (For Group information, see the preceding section.) Check the transmitter for proper operation before attempting to change its operating frequency.

  • Page 12: Test Cable

    Wireless Service Equipment manual. 1. Unsolder the antenna lead from the pc board. 2. Attach the center conductor of the 50 Ω 174 cable to the antenna solder pad, and the shield to ground. 3. Turn on the T1. 25C1016 (CC) Service Procedures...

  • Page 13: Display Checks

    Shure T1 Body-Pack Transmitters Test Points Audio In, J104, pin 3, Model T1-P. 9 (–) Audio In, J103, center conductor Limiter components -in. phone jack, Model T1-G. (not in all units) Audio Antenna Output Intermediate Output 9 Vdc 8 (+)

  • Page 14: Audio Alignment

    Audio Alignment This section continues the procedures of the preceding subsections. D: Gain 1. Reconnect the power supply to the T1, and set its Mute switch to “On.” Set the audio analyzer output as follows: Frequency: 1 kHz Amplitude: 70 mV 2.
  • Page 15 Power On/Off (S101) Switch (S102) Audio Analyzer Receiver Audio Test Configuration for T1 Figure 4. E: Audio Frequency Response 1. Change the frequency of the audio analyzer to 100 Hz. 2. Deactivate the audio analyzer’s 400 Hz high pass filter.
  • Page 16 Modulation Source: Int 1 kHz FM Deviation: ±15 kHz Amplitude: –38 dBm 3. Select a receiver for the T1, making sure it is set to the same frequency as the transmitter. Disconnect the receiver’s antenna (non-diversity) or antennas (diversity). 4. Solder the 50 Ω cable to the receiver’s antenna pads:...
  • Page 17 Shure T1 Body-Pack Transmitters 7. Set the audio analyzer to measure distortion. Verify that the au- dio distortion at the unbalanced output of the matching receiver is less than 0.5%. If necessary, adjust R130 to obtain minimum distortion. Note: For...
  • Page 18 Shure T1 Body-Pack Transmitters Bench Checks Dc Power n Verify that 9 Vdc (±0.35 Vdc) is present at 6. If this voltage is low, trace the circuitry back to the power supply to see where the loss occurs. Check: power switch...
  • Page 19 Shure T1 Body-Pack Transmitters n Check the bias voltage (`4 Vdc) on pins 8, 9, and 10 of U102. If the correct voltage is not present: Make sure the Mute switch is set to “On.” Trace the bias circuit from the 5 V line through R104 to pin 10 of U102.
  • Page 20 Shure T1 Body-Pack Transmitters Excessive Current Drain n Try readjusting C215 for lower current drain while maintaining output power to specification. If the current drain is still exces- sive, check for the following: short wrong resistor value shorted capacitor n As a last resort, try changing Q204.
  • Page 21 Shure T1 Body-Pack Transmitters Notes: Notes: 25C1016 (CC)

  • Page 22: Product Changes

    T1 and : The Model (with a permanently attached lavalier microphone) was replaced by the model T1 (with a Tini connector instead of an attached microphone). Belt Clip: The older metal-plate clip was replaced by a wire-and- plastic, spring-loaded clip. A new case bottom accommodates the new clip.
  • Page 23 Shure 98A195 (no longer available) lavalier microphone To adapt a transmitter to work with other microphones, see “Converting a to a T1) on page 8. C215 Capacitor, variable 3–10 pF Shure 152C02 D101 Light-emitting diode, green (power) Shure 86A8959 D102 Light-emitting diode, red (low battery)
  • Page 24 U101 Integrated circuit, compandor Shure 188A01 (Signetics U102 Quad op amp Shure 188A49 ( 33179 Y201 Crystal Shure 40_8006A (SeeTable 2, p. 10 in “Service Procedures” to determine the let- ter in the blank space.) Table 2 Frequency-Dependent Parts Freq.
  • Page 25 Shure T1 Body-Pack Transmitters Figure 5. Pcb Side 1 Figure 6. Pcb Side 2 Replacement Parts and Drawings 25C1016 (CC)
  • Page 26 9.0 Vdc TP 7 5.0 Vdc TP 8 (+) Battery TP 9 (–) Battery Figure 7. Earlier Version of T1 Pc Board (Side 1) Figure 8. Earlier Version of T1 Pc Board (Side 2) 25C1016 (CC) Replacement Parts and Drawings...
  • Page 27 Shure T1 Body-Pack Transmitters [Insert:  11) as p. 26; Earlier Version of T1 schematic (8 Current T1 schematic (11  17) attached] Do not print this page! Replacement Parts and Drawings 25C1016 (CC)
  • Page 28 150DA278CA 82B8015 162D06 .180 GROUP C 199.000 – 216.000 MHz 150DA228CA 150DA828CA 150DA820JA 150DA180KA 150DA228CA 82C8015 162E06 .150 C222 C217 PART NO. PART NO. 150DA270JA 152F01 150DA220JA 152D01 E 1999, Shure Brothers Inc. 150DA180KA 152D01 T1 Earlier Version 27B1016 (SB)
  • Page 29 T1P will have J104 present on on the final product. 16 V T1 will have J201 present on the final product. The wires from the mic jack board to the main board (W1-W4) are in the form of a R122* R123* four conductor ribbon cable.
  • Page 30 T1P will have J104 present on on the final product. 16 V T1 will have J201 present on the final product. The wires from the mic jack board to the main board (W1-W4) are in the form of a R122* R123* four conductor ribbon cable.

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