Notes. Shure SLX 2

The SLX SLX2 is a frequency-agile UHF handheld transmitter. It operates for a minimum of 8 hours using two "AA" alkaline batteries. It is designed for use with SM58, BETA 58, SM86, and BETA 87A&C microphone heads, and features an internal antenna for optimum range and reliability. This product is intended for use in entry-level presentation, installed, and performance markets.

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NOTES

25A1090 (Rev.3)

PRODUCT SPECIFICATIONS

MECHANICAL

Overall Dimensions

64 mm x 109 mm x 19 mm (2.50 x 4.30 x 0.75 in.)

Weight

73 grams (2.6 oz), without batteries

Housing

Molded ABS case and battery cover

GENERAL

Frequency Range and Transmitter Output Level

Band

Range Transmitter output

518–542 MHz 30 mW/15 dBm

572–596 MHz 30 mW/15 dBm

638–662 MHz 30 mW/15 dBm

702–726 MHz 30 mW/15 dBm

800–820 MHz 20 mW/13 dBm

838–865 MHz 10 mW/10 dBm

806–810 MHz 10 mW/10 dBm

740–752 MHz 10 mW/10 dBm

NOTE: This Radio apparatus may be capable of operating on some frequencies not authorized in your region. Please contact your national authority to obtain information on authorized frequencies for wireless microphone products in your region.

Operating Range Under Typical Conditions

100m (300 ft.)

Note: actual range depends on RF signal absorption, reflection, and interference

Audio Frequency Response (+/– 2 dB)

Minimum: 45 Hz

Maximum: 15 kHz

Total Harmonic Distortion (ref. +/– 38 kHz deviation, 1 kHz tone)

0.5%, typical

Signal-to-Noise Ratio

>100 dB A-weighted

Operating Temperature Range

–18°C (0°F) to +50°C (+122°F)

Note: battery characteristics may limit this range

Transmitter Audio Polarity

Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 (with respect to pin 3 of low impedance output) and the tip of the high impedance 1/4-inch output.

Gain Adjustment Range

25 dB

Audio Input Level

-5 dBV maximum at mic gain position

+10 dBV maximum at 0 dB gain position

+20 dBV maximum at -10 dB gain position

Input Impedence

1 M

Ω

25A1090 (Rev.3)

ENVIRONMENTAL

RF Transmitter Output

30 mW maximum (dependent on applicable country regulations)

Dimensions

254 mm H x 51 mm dia. (10x2 in) including SM58 cartridge

Weight

375.6 grams (13.25 oz) without batteries

Housing

Molded ABS handle and battery cup

Power Requirements

2 “AA” size alkaline or rechargeable batteries

Battery Life

>8 hours (alkaline)

Temperature Storage

7 days at +165 F (+74 F) degrees, unpackaged.

7 days at -20 F (-29 C) degrees, packaged.

After each 7-day storage period, units must be allowed to stabilize for 24 hours before testing.

Units must operate per Section V.

Temperature Cycling

5 cycles from -20 F (-29 C) degrees to +165 F (+74 C) degrees. Allow 24 hours for stabilization before testing. Units must operate per Section V specifications mechanically and electrically.

Operational Temperature

Operate units as described in Section V at +0 F (-18 C) and +135 F (+57.9 C) degrees. Allow three hours for stabilization of each temperature before testing. Units must operate per Section V specifications.

Steady State Humidity

Perform a 10 day test at 90% RH at room temperature. Evaluate units for visual and mechanical defects after 1, 3, 5, 7, and 10 days. At the end of the 10-day period allow the units to recover for 24 hours. Units must pass Section V specifications.

Operational Humidity

Operate units as described in Section V at 90% RH at room temperature.

Allow two days for stabilization.

Moisture Resistance

Perform a 10-day test at 90% to 98% RH with temperature cycled between +14 F (-10 C) and

+150 F (+65 C) degrees. Allow the units to recover for 24 hours. Product must meet Section

V specifications.

Mechanical Shock

Handheld Drop Test: Drop product from a height of 6' onto a hardwood floor for a total of 10 drops. The unit must pass Section V specifications.

Stand Drop Test: Place product on a stand with the appropriate size swivel adapter. Drop unit from a height of 5' onto a hardwood floor for total of 10 drops. The product must meet Section

V specifications.

Electrostatic Discharge

Product will be subjected up to a ± 15 kV air discharge and ± 4 kV contact discharge. Units must operate per Section V specifications.

25A1090 (Rev.3)

TROUBLESHOOTING

Servicing will be more efficient when the history of the unit is known and can be taken into account. The service strategy should be different when a unit fails on the production line than when it fails in the field, because if it fails on the line there is a possibility of incorrect or missing parts.

If the unit has failed in the field, check for signs of tampering or hand soldering that could indicate that the customer has modified the unit or has attempted to repair it.

PRELIMINARY TESTS

Install two fresh "AA" batteries and turn the unit on. Verify normal display operation. Set the unit to the lowest frequency in the group.

Observe the radiated output on a spectrum analyzer by holding it near the analyzer's antenna. Measure the frequency and RF power output level and verify that they are within expected limits.

Speak into the microphone. Observe the modulation on the spectrum analyzer display and listen to the audio output on a matching SLX4 receiver tuned to the same channel; preferably the customer's unit, if this is a field return. Check for normal audio level. Listen for distortion, noise, or any unusual sounds.

Change the frequency to the highest frequency in the group. Repeat steps 2 and 3 above and verify that operation is normal.

RF FREQUENCY OR SIGNAL PRESENCE PROBLEMS

If there is no carrier present at the transmitter antenna port or measured RF power is unusually low, check the earlier stages to verify decent continuity of the signal path. An amplifier stage or filter may have a part placement error or other defect. Usually the first step is to visually examine the board for skewed / missing parts before going in with a probe. If there is no signal out of the

VCO output then check the control voltage at TP_PLL_TV when the transmitter is set at the lowest channel in the group. If the voltage is not tunable into the 1.1-1.4 V window but can be tuned to a lower or higher voltage, this means the VCO might be built for the wrong band or has a wrong part.

Check the values of the caps C522, C523, C528, C525, C534, and inductor L505 one by one and try to tune into the window. (Note that these caps are Low-ESR series!) If the voltage at

TP_PLL_TV is 0 V and does not respond to tuning CV500, the loop is unlocked.

Check Y500 for a 16 MHz oscillation by setting the analyzer to CENTER FREQ=16 MHz, REF.

LEVEL=-40 dBm, SPAN=1 MHz. Hold the probe right above the crystal and look for a spike-like signal. If one is present, check the parts in the VCO, including parts other than the capacitors mentioned above to see if anything is not soldered correctly.

Check bias voltages on the transistors to verify that they are powered and biased correctly. If an oscillation exists at the output and is close to the nominal center frequency (within 100 kHz) but cannot be tuned to the +/- 3 kHz window via CV501, check the value of the caps C536 and

C537.

Check that the trimmer CV501 is soldered correctly.

LOW RF OUTPUT POWER

If RF signal is present at the right frequency with low power, compare the RF power measurements with a known good board at various points moving from the antenna backwards towards the VCO. Look for signal discontinuities in the path (sudden large drop in measured power by more than a few dB).

Check the board visually for missing/skewed parts. Try to confine the problem to a specific circuit segment, and then check solder connections and part values or DC voltages for error. If the power out of the VCO is very low, check the bias voltages on the transistors and the values of

L502, C551, C543, C530.

EXCESSIVE CURRENT DRAIN

Try isolating different sections of the transmitter, such as the RF, Audio, and Digital circuits.

Look for reversed polarity capacitors, wrong resistor values, poorly soldered components, and shorted traces.

25A1090 (Rev.3)

DEVIATION PROBLEMS

If TR200 can't be adjusted to obtain proper deviation, try to isolate the problem to the Audio or RF section. To check the RF section, set the transmitter frequency to the frequency listed in

Table 1.2 in Section IV and verify that the tuning voltage of the VCO is correct. To check the audio section, apply -10dBu at 1kHz to TPA0. Set the gain to "0 dB". Check for audio with a scope at

TPA1. The level should be approximately 0dBu. Next, check the audio level at TPA2 for -0.8dBu.

Finally, check the level at pin 14 of IC150-4. If the level is correct, check the values of R504,

R510, R511, and C513-C5126 in the VCO area. If there is no audio, or the level is wrong, the problem is in the audio section. Trace backwards through the audio stages until you find the problem.

MICROCONTROLLER TROUBLESHOOTING

This paragraph describes what digital signals need to be seen to have audio running through a SLX system. The first thing that needs to be checked is, if the microcontroller is running its software.

If you see numbers or only fragments of numbers on the display after the unit has powered up, the microcontroller is running fine. Fragments of numbers in the display point to an open LCD driver pin or an intermittent LCD panel connection.

To test the microcontroller for normal operation, please test the following pins and conditions.

Microcontroller Pin Number

1 to gnd

4 to gnd

Across 10 and 9

Across 20 and 21

Across 28 and 29

31 to gnd

Net Name

~RST

~IRQ

VDD and VSS

VDDAD and

VSSAD

VDDA and

VSSA

OSC2

Condition

3.3V

3.1V

3.3V

Square Wave f0=32768Hz

The turn on procedure of the SLX transmitters includes several stages:

T = 0.000s: The power is turned on (soft switch). 5V and 3.3V are established approximately at the same time.

T = 0.480s: 32.768KHz crystal oscillates in a stable manner (~300ms) and internal reset cycle (~180ms) is over. From now software gets executed.

T = 0.???s: Microcontroller pin 5 (RF_VCC_OFF) goes from 5V to 0V. Synthesizer is powered on.

T = 0.???s: PLL data gets sent. You should see a signal similar to the graphic on an oscilloscope.

25A1090 (Rev.3)

(1) = PLL_LE @ pin 34, (2) = PLL_DATA @ pin 35, (3) = PLL_CLOCK @ pin 36

T = 1.800s: Microcontroller pin 6 (RF_GND_ON) goes from 0V to 5V. RF carrier gets unmuted.

T = 2.000s: Tone-key is turned on. You will see a square wave (Vpp = 5V, f0=32768Hz) at microcontroller pin 18 (TONEKEY_SQUARE).If these stages can be captured with the scope, the microcontroller did its part to let audio go through the system. If audio is still not being transmitted, please involve RF spectrum analyzer and oscilloscope to debug the RF and audio stage of the transmitter.

25A1090 (Rev.3)

REPLACEMENT PARTS

PRODUCT CHANGES

PARTS DESIGNATIONS

The following comments apply to the parts list and the schematics:

Resistors: Unless otherwise noted, all resistors are surface-mount with 1/10 W rating and 1% toler-

ance.

Capacitors: Unless otherwise noted, non-polarized capacitors are surface-mount NPO dielectric types

with a 100 V capacity and a 5% tolerance, and polarized capacitors are tantalum types.

COUNTRY

CODE

SLX2 MODEL VARIATION

FREQUENCY

RANGE

COUNTRY

DESIGNATION

554-590 MHz

572-596 MHz

638-662 MHz

702-726 MHz

740-752 MHz

800-820 MHz

838-865 MHz

806-810 MHz

U.S.A. and CANADA

EUROPE / CHINA

KOREA

EUROPE

GREAT BRITAIN

JAPAN

SLX2

RF-AUDIO

PC BOARD NUMBER

200H510304

200J310304

200L410304

200P410304

200Q410304

200R510304

200S610304

200JB10304

25A1090 (Rev.3)

Reference

Designation

MP1

MP2

MP3

MP4

MP5

SLX2 HARDWARE REPLACEMENT PARTS

Description

IR Assembly

IR Detector 40kHz

3 Pin Male Connector Strip

Handle Assembly

Aluminum ID Ring

IR Bezel

Battery Cover Assembly

Foam Pad

Battery Holder Assembly

Headboard PCB

Copper Contacts

3 Pin Interconnect Strip

Retaining Ring

Internal Frame

Shure

Part Number

190A10302

188A617

170A76

95A9047B

53A8594

65A8474

95A9068

36A814

95B9048

190-057-03-34

53F2039A

56E8074

30A1314

65B8467

25A1090 (Rev.3)

MP6

MP7

MP8

MP9

MP10

MP11

MP12

MP13

MP14

MP15

MP16

MP17

Bezel

Pushbutton Switch Actuator (Power/Mute/Select)

Battery Cup

Frequency Nameplate

PCB Screw

Battery Nest Screws

RF Shield Cover

LCD Holder/Backlight

LCD Bezel

LCD

LCD Zebra Connector

Compression Pad (For Positive Battery Contact)

65A8475B

66A8070

65BA8451

39__8466

Provide

Frequency Code

In The Space

30J1245B

30D443E

53A8590A

65A8452

53A8573B

95A8991

80A8257

38D189

SLX2 REPLACEMENT PARTS (TOP)

Reference

Designation

Description

C100

C162

Capacitor, Tantalum, SMD1206, 15uF, 10V, 10%

Capacitor, Tantalum, SMD1411, 10uF, 16V, 10%

C531 Capacitor, Tantalum, SMD1206, 0.1uF, 35V, 10%

C432, 548, 549 Capacitor, Tantalum, SMD1411, 100uF, 6V, 10%

DS375

DS420

E408, 500

IC1

Chippled Green LED

Bicolor (Red/Green) LED

Bead, Ferrite, SMD 805, 600 OHM

L.C.D. Backlight Holder

IC100

IC370

IC350

IC430

Q185

Q410

SW324, 325

Y331

28 Pin QSOP Compander (THAT4320)

1K Microwire EEPROM (93AA46AT-I/OT)

Segment-Type, LED Driver

3.3V CMOS LDO Regulator (SP6213EC5)

Low Noise Transistor (MMBT5089L)

Transistor, Power, Mosfet (NSD355AN)

Switch, Pushbutton, Momentary, SPST

Crystal, Quartz, SMD, 32.768 kHz

Shure

Part Number

151AC156KA

151AD106KB

151AG104KA

151AB107KB

184A77

184A39

162A12

65A8452

188A568

188A577

188A506

188A590

183A38

183A74

155A21

40A8010

Reference

Designation

CON100

CON301

CON600

CON601

CON640

CV500

CV501

D162, 190

D400, 480

D500

D600

E100

IC150

IC400

IC501

SLX2 REPLACEMENT PARTS (BOTTOM)

Description

3 Pin Socket Strip (Female) For headboard

3 Pin Socket Strip (Female) For IF cable

Positive Battery Contact

Negative Battery Contact

Connector, COAX w/Switch (ONLY JB models)

Trim Cap., SMD, 0.65 - 2.5pF

Trim Cap., SMD, 3.0 - 15pF

Switching Dual Diode, SMD (MMBD2836L)

Common Anode Schottky Diode (BAT 54A)

Variable Capacitance Diode

Dual Schottky Diode (BAT 54S)

Bead, Ferrite, SMD 805, 600 OHM

Quad Op. Amp., SO-14 (MC33179)

Sync Boost Converter (LTC3400ES6)

Low Power Dual Synthesizer (LMX2335LTM)

Shure

Part Number

170C15

95A9054

53A8591

95A9064

170A36

152A04

152E05

184A07

184B69

184A72

184A69

162A12

188A49

188A479

188B388

L404

L501, 503

L600, 601

L611

Q205

Q475

Q501, 502

Q600

Inductor, SMD 2518, 4.7nH

Inductor, SMD 603, 100nH

Inductor, SMD 603, 150nH

Inductor, SMD 603, 10nH

Transistor, TMOS, SOT-23 (2N7002L)

Transistor, Power, Mosfet (NSD355AN)

Transistor, High Frequency (2SC5006)

Transistor, SOT-23 (AT-41533)

162A64

162A25

162AE56

162N25

183A30

183A74

183A66

183A49

Q601

Q630

SW100

TR160, 200

TR640

Y500

Transistor, Bipolar, Silicon (AT-41486)

Transistor, PNP, SOT-23 (MMBT2907L)

Q375, 480, 631 Transistor, Low Noise, SOT-23 (MMBT5089L)

SW324, 325 Switch, Pushbutton, Momentary, SPST

183A44

183A27

183A38

155A21

Switch, Slide, 2-Position 155A32

Trim-pot., Line, 100K

Ω 146E10

Trim-pot., Line, 470

Ω

146A10

Crystal, Quartz, SMD, 16MHz 140A26

Frequency

Code

C506

C522

C523

C525

C528

C534

C543

C551

C603

C611

C612

C615

C616

C617

C618

C619

C651

C97

E301

E302

E303

MICROCONTROLLER (IC300) SELECTION

Shure Part Number Country

Code

188A585A

188B585A

188C585A

188D598A

188E585B

188F585A

188G585A

188H585B

FREQUENCY DEPENDENT PARTS**

J3 L4 P4 Q4 R5

120pF

3.9pF

10pF

2.7pF

10pF

6.8pF

12pF

120pF

8.2pF

DNP

600

Ω

600

Ω

600

Ω

150pF

6.8pF

3.3pF

3.9pF

3.3pF

3.9pF

12pF

8.2pF

68pF

2.7pF

6.8pF

2.2pF

12pF

8.2pF

10pF

68pF

5.6pF

3.9pF

1.5pF

3.9pF

10pF

5.6pF

6.8pF

DNP

68pF

2.7pF

6.8pF

2.2pF

12pF

8.2pF

5.6pF

68pF

4.7pF

2.7pF

2.2pF

2.7pF

4.7pF

DNP

68pF

2.2pF

6.8pF

2.2pF

12pF

8.2pF

3.9pF

68pF

3.9pF

2.2pF

1.0pF

2.7pF

4.7pF

2.2pF

DNP

68pF

3.9pF

10pF

2.2pF

12pF

8.2pF

6.8pF

68pF

3.9pF

1.8pF

2.7pF

2.2pF

6.8pF

5.6pF

DNP

68pF

3.9pF

10pF

2.2pF

12pF

8.2pF

6.8pF

68pF

3.3pF

2.2pF

1.8pF

1.5pF

2.2pF

6.8pF

5.6pF

DNP

68pF

3.3pF

5.6pF

3.3pF

10pF

8.2pF

4.7pF

68pF

3.3pF

2.2pF

1.8pF

1.0pF

2.2pF

6.8pF

5.6pF

DNP

25A1090 (Rev.3)

68pF

3.9pF

10pF

2.2pF

12pF

8.2pF

6.8pF

68pF

3.3pF

2.2pF

1.8pF

1.5pF

2.2pF

6.8pF

5.6pF

DNP

R606

R607

R612

R613

R614

R640

R650

R651

R201

R320

R652

R653

L602

L603

L604

L605

L606

L607

L640

L641

E603

L301

L302

L303

L400

L401

L502

L505

22nH

DNP

18nH

15nH

DNP

6.8nH

600

Ω

DNP

470nH

15nH

5.4nH

DNP

121K

DNP

22.1

Ω

DNP

499

Ω

499

Ω

DNP

499

Ω

499

Ω

22.1

Ω

DNP

22nH

DNP

18nH

12nH

8.2nH

DNP

8.2nH

600

Ω

220nH

470nH

15nH

5.4nH

DNP

150K

DNP

3.01K

DNP

22.1

Ω

DNP

499

Ω

499

Ω

DNP

499

Ω

499

Ω

22.1

Ω

DNP

8.2nH

180nH

8.2nH

6.8nH

8.2nH

DNP

12nH

DNP

180nH

220nH

6.8nH

2.55nH

DNP

121K

DNP

30.1K

DNP

22.1

Ω

DNP

221

Ω

22.1

Ω

221

Ω

DNP

221

Ω

22.1

Ω

221

Ω

22.1

Ω

DNP

15nH

DNP

12nH

8.2nH

DNP

1.2nH

600

Ω

220nH

470nH

12nH

3.85nH

DNP

121K

DNP

18.2K

DNP

22.1

Ω

499

Ω

499

Ω

DNP

499

Ω

499

Ω

22.1

Ω

DNP

18nH

DNP

12nH

8.2nH

12nH

DNP

10nH

600

Ω

220nH

470nH

15nH

3.85nH

DNP

121K

4.99K

DNP

22.1

Ω

DNP

499

Ω

499

Ω

DNP

499

Ω

499

Ω

22.1

Ω

DNP

8.2nH

180nH

10nH

6.8nH

12nH

DNP

12nH

DNP

180nH

220nH

6.8nH

2.55nH

DNP

150K

DNP

12.1K

DNP

22.1

Ω

DNP

Ω

DNP

221

Ω

22.1

Ω

221

Ω

DNP

8.2nH

180nH

8.2nH

6.8nH

8.2nH

DNP

12nH

DNP

180nH

220nH

6.8nH

2.55nH

DNP

121K

DNP

7.5K

DNP

22.1

Ω

DNP

Ω

DNP

499

Ω

18.2

Ω

499

Ω

DNP

8.2nH

180nH

8.2nH

6.8nH

8.2nH

12nH

DNP

180nH

220nH

6.8nH

2.55nH

DNP

150K

DNP

7.5K

DNP

49.9

Ω

DNP

221

Ω

22.1

Ω

221

Ω

33.2

Ω

221

Ω

22.1

Ω

221

Ω

22.1

Ω

DNP

25A1090 (Rev.3)

SLX2 PRINTED CIRCUIT BOARD ASSEMBLY - SLX2

TOP VIEW

25A1090 (Rev.3)