Схема и документация усилителя Other GENERALMUSIC MEDIALIVE ACTIVE

Формат файла: PDF

CROSSOVER BOARD
NOTE: The technical support is madeonly by replacement the entire board.
DUAL-CONEWIDERANGE
NOTE: THE POWER STAGE IS INVERTING
768176 - SUPPLY & POWER BOARD
SCHEMATIC DIAGRAM
Sound Pressure Media & Live
313050/313006/313014
ALL RIGHTS ARE RESERVED, NO COPIESOR REPRODUCE THIS DOCUMENT WITHOUTWRITTEN CONSENT BY GENERALMUSIC.
GENERALMUSIC S.p.A. ITALY
- Connect the Mains plug to the Variac
- Dual trace oscilloscope (Earth lift)- Digital voltmeter or multimeter
Instruments, materials and tools:
- Temperature Meter
Test Procedure:
- Variac (0-250Vac)
- Audio generator
- 8E 100W Resistor
- Connect the Ch.1 oscilloscope probe on the output (R40 side RL1) and set it at 20V/div 200uS/div
- Place the temperature sensor on the heatsink near a final transistor- Insert the Voltmeter terminals across R24 (or alternatively R31)- Put the VOL potentiometer at maximum level
- Connect the Audio generator to the input and set it to 1KHz sinus signal
TEST & ADJUSTMENT PROCEDURE
- Turn the trimmer VR1 on Power Board full counterclockwise (from solder side)
SP-MEDIATWO-WAYSPEAKER
3) Increase slowly the Variac to the nominal value of 230Vac and check if the output appear correctly,
2) Set the input signal to obtain 0dB (0.775Vrms) or -10dB (0.245Vrms) to the appropriate input.
4) Check if the high rails operates correctly connecting the Ch.2 oscilloscope probe alternatively to D10 cathode and D9 anode, should be appear the follow waves:
the value must be 43Vp, eventually regulate the level adjusting VR2 trimmer.
1) Turn on the amplifier
9) Re-connect the speaker instead of the 8E 100W resistor
7) Increase the input level to obtain an output voltage about of 0.5Vpp, check if don`t appear a cross-talk distortion, eventually slightly adjust the VR1 position until distortion disappear
5) Set the Variac to 0, connect the 8E 100W resistor to the amplifier output instead of the speaker or x-over, check again if the amplifier operates correctly as specified at points 3 and 4 but with the level reduced to 38+/-0,7Vp.
Adjustment procedure:
6) Leaving the amplifier operate, wait until the temperature reaches 50 c, set the input signal to 0 and wait some seconds to stabilize the temperature, adjust the VR1 trimmer to obtain 10+/-0.05mV on the Voltmeter.
8) The voltage value across R24 (or R31) resistor must not exceed 15mV
47Hz @ -3dB
INPUT (bal 0dB)
CHASSISGROUND
(unbal -10dB)
237074115Vac 100VA
768175 - INPUTS & DRIVER BOARD
230Vac 100VA
FINAL STAGE
768175 - INPUTS & DRIVER BOARD
BALANCED INPUT XLR or
BLOCK DIAGRAM
NEGATIVELOW RAIL
FINAL STAGE
NEGATIVEHIGH RAIL
NEGATIVEVOLTAGE
768176 - SUPPLY & POWER BOARD
INPUTRCA &
TRANSFORMER
POWERSWITCH
85-20000 (Media) 70-20000 (Live)
less than 0.1%
30K (balanced)15K (unbalanced)
0 (0.775Vrms)
-10dB (0.245Vrms)
10K (unbalanced)
95 (Media) 91 (Live)
119 (Media) 115 (Live)
MAINS (US Ver.)115Vac +/-15% - 50/60Hz
TECHNICAL SPECIFICATIONS
Frequency Response (Hz -6dB)
Distortion (THD+N)
Power (Wrms)
XLR Input Impedance (ohm)
XLR Input Sensitivity (dB)
Sensitivity (dBspl 1W/1mt)
RCA Input Impedance (ohm)
RCA Input Sensitivity (dB)
Max Sensitivity (dBspl)
MAINS (EU Ver.)230Vac +/-15% - 50Hz
1x6 1/2"woofer
Media: 1x1"tweeter with EWT horn
Live: 1x6 1/2"widerange (Live)
3.2KHz @ 12dB/oct. (Media)
Crossover Frequency (Hz)