Proel Flash 5A V2 Manual

Proel Højttaler Flash 5A V2

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Side 1/3

R&D Department

Testing Procedure

From PROEL R&D DEPT.

To PROEL SERVICE DEPT.

Object FLASH5 - A amplifier module TESTING PROCEDURE

Date 30 /20/04 14

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 0 250 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, IC5 and IC3.

- Set the LINE LEVEL control 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 P8 black wire/faston (GND), scope CH1 probe tip to P6 red wire/faston

( ) LOW OUT and 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 he 4 Ωload resistor at LOW OUT and verify that the signal is symmetrical refer to GND, without

detectable distortion and oscillation.

- Remove signal from XLR Input.

- . Connect the signal generator to LINE INPUT (RCA socket) and set it at - u20 dB

- . Verify that low amplifier output signal is 28V ±6 Vpp

a - - -NOTE: the low amplifier is designed with class D half bridge self oscillating amplifier around the

IRS2092 ic, to see in detail how this amplifier works consult IRS2092 data sheet and related application

notes available on International Rectifier website (www.irf.com). The low amplifier oscillating frequency

is in the range of If there is a problem in the nested loop the amplifier doesn’t oscillate: 400-420 KHz.

switch off then check TR6. –If the mosfets isn’t fault check the voltage, using the DMM, between VCC

and pin 3 of IC2 (7812), this is the voltage regulator of low side mosfet driver, if this regulator doesn’t

work the amplifier doesn’t oscillate.

3 . COMPRESSOR check of LOW amplifier

- Increase the signal at +10 dBu and check that the output signal remains constant at 40 ±4 Vpp. Check that

the SIGNAL/COMP LED . has changed the colour from GREEN to RED

- Disconnect the 4ohm load resistor from the LOW amplifier output.

6. HIGH amplifier check

- Connect the signal generator to LINE INPUT (XLR/JACK socket) and set it at 10 KHz , 0 dBu.

- Verify that the CH2 (HIGH OUT) signal is symmetrical referring to GND, without detectable distortion and

oscillation.

- Connect the 8 Ωload resistor at LOW OUT and check that the HIGH amplifier output signal is limited to 20

±3 Vpp.

7. X- OVER check.

- Disconnect all resistive loads and set the signal generator to -10 dBu.

- Sweep the frequency and check that the LOW amplifier power out signal level is as the 1a plot and HIGH

frequency amplifier power signal level is as 1b plot.

- Set the NEARFIELD/MIDFIELD button in MIDFIELD position.

- Sweep again the frequency and check that the LOW amplifier power out signal level is as the 2a plot and

HIGH frequency amplifier power signal level is as 2b plot.

Produkt Specifikationer

Mærke:	Proel
Kategori:	Højttaler
Model:	Flash 5A V2

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