Functional Test; Listening Test; Test Setup; Display Test - Shure SLX2 Service Manual

FUNCTIONAL TEST

25A1090 (Rev.3)
REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):
Spectrum analyzer or power meter
Digital multimeter
Audio Analyzer
Frequency Counter
Power Supply
Shielded test lead
BNC (Male) to BNC (Male) cable (1)
UA820 Antenna
Audio Test Head
Brass Ring

LISTENING TEST

Before completely disassembling the transmitter, operate it to determine wether it is functioning normal-
ly and try to duplicate the reported malfunction. Refer to pages 2 and 3 for operating instructions, trouble-
shooting, and specifications.
Review any customer complaint or request, and focus the listening test on any reported problem. The
following, more extensive, functional tests require partial disassembly.
FUNCTIONAL TEST
Refer to the Disassembly section to partially disassemble the transmitter for the following functional
tests.

TEST SETUP

1. Remove the PCB from the handle.
2. Set gain switch to "0" dB.
3. Connect the (+) terminal of the power supply through a milliammeter to the (+) battery terminal and
the (-) power supply terminal to the (-) battery terminal.
4. Connect a DC Voltmeter across the power supply and set the power supply for 3Vdc.
5. Connect the audio analyzer to the microphone via the microphone test head (PT1840) as needed.

DISPLAY TEST

1. Power unit ON.
2. Verify that all display segments are displayed for approximately 2 seconds. This includes a full bat-
tery indication and "1818" displayed for group and channel.
REVERSE BATTERY PROTECTION TEST
1. Adjust power supply to -3.0 ± 0.1 V dc.
2. The current should be less than 0.5 mA.
VOLTAGE REGULATION TEST
With power applied properly, and the unit switched on, measure the DC voltages at the following test
points. All test points are located on the top side of the PCB. Refere to the component diagram.
• TPBATT+ (Battery input) = 3 ± 0.2 Volts
• TP5V (Power Converter) = 5 ± 0.2 Volts
• TP3.3V (Power Converter) = 3.3 ± 0.2 Volts
• TPA1 (Audio Preamp) = 2.5 ± 0.2 Volts
• TPA3 (Tone Key Summing Amp (IC150 Pin 14)) = 2.5 ± 0.2 Volts
• TPVREF (IC100 Pin 5) = 2.5 ± 0.1 Volts
CURRENT CONSUMPTION TEST
1. With +3V applied to the battery terminals and the unit powered on.
2. Verify the current drain is 130 ± 15mA.
HP8590L/Agilent E4403B/Agilent E4407B
Power Supply must be able to supply 3Vdc
10
Fluke 87
HP 8903B
HP 53181/HP 5385A
with an internal ammeter.
Shure PT1838F
Shure PT1838A
Frequency Dependent
PT1840
PT1838Y