Proel Flash 5A V2 Handleiding

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R&D Department

Testing Procedure

From PROEL R&D DEPT.

To PROEL SERVICE DEPT.

Object FLASH5- A amplifier module TESTING PROCEDURE

Date 30/20/0414

Instruments required:

1) Sinusoidal audio signal generator

2) 100MHz or more dual trace oscilloscope (scope)

3) True RMS digital multimeter (DMM) with dBu scale

4) 250W or more Variac transformer with 0250 Vac range (230V european version)-

or with 0- 140 Vac range (120V US version)

5) 4 Ω 1 00W or more resistive load

6) 8 Ω 5 0W or more resistive load

7) Music and pink noise signal generator (CD player)

IMPORTANT: The oscilloscope must be insulated from the earth ground.

1. Set up

- Check the correct earth main connection on the rear surface of the front panel.

- Check the insulation between the heat sink and the case of IC4, IC5and IC3.

- Set the LINE LEVELcontrol full clockwise.

- position. Set the NEARFIELD/MIDFIELD button in NEARFIELD

- Switch OFF the amplifier module.

2. Low amplifier check

- Connect the mains of amplifier module to VARIAC and set it at zero AC voltage.

- Connect the scope CH1 GND clip to P8black wire/faston(GND), scope CH1 probe tip to P6 red wire/faston

() LOW OUTand scope CH2 probe tip to P10 black wire/faston (HIGH OUT).

- Switch ON the amplifier module.

- Increase slowly the VARIAC voltage up to the nominal value (230Vac or 120Vac).

- Check the transformer secondary voltages with DMM (without signal on input):

52 ±2 Vac between red wire

32 ±2 Vac between yellow wire

- -Using DMM check also the +15Vdc / 15Vdc supplies on relative voltage regulator outputs (IC4 & IC5

devices).

- . Connect the signal generator to LINE INPUT (XLR/JACK socket) and set it at 100 Hz, -10 dBu

- . Verify that CH1 (LOW OUT) signal is 30V ±6 Vpp

- Check of SIGNAL/LIMIT LED function, moving the volume potentiometer of the amplifier;

when the output signal is < 2 Vpp the led must be OFF

when the output signal is > 2 Vpp, the led must be GREEN.

- lockwise. Rotate the volume potentiometer knob fully c

- u. Set the signal generator at 0 dB

- t Connect he4 Ωload resistor at LOW OUT and verify that the signal is symmetrical refer to GND, without

detectable distortion and oscillation.

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