Схема и документация усилителя Other GENERALMUSIC P1000

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TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Dimensions:
483x88x445mm (2U)
Power Requirements:
(230Vac±15% 50/60Hz)
(115Vac±15% 50/60Hz)
Output Power:
stereo/parallel)
2x 500Watts
stereo/parallel)
2x 350Watts
Max. Undistorted Out: (4
stereo/parallel)
stereo/parallel)
Input Sensitivity:
(constant sensitivity)
0.775Vrms (0dB)
(constant gain)
2.25Vrms (+9.2dB)
Input Impedance:
(unbalanced)
Voltage Gain:
(constant sensitivity)
(constant gain)
Damping Factor:
stereo/parallel)
stereo/parallel)
Frequency Response
at Full Power:
(SMPTE 60Hz/7KHz 4:1)
(unweighted)
TEST PROCEDURES & ADJUSTMENTS
TEST PROCEDURES & ADJUSTMENTS
TEST PROCEDURES & ADJUSTMENTS
TEST PROCEDURES & ADJUSTMENTS
TEST PROCEDURES & ADJUSTMENTS
µ To prevent short circuit during any test, the oscilloscope must be
the oscilloscope must be
the oscilloscope must be
the oscilloscope must be
the oscilloscope must be
EARTH insulated
EARTH insulated
EARTH insulated
EARTH insulated
EARTH insulated, this occurs because some test require to connect itsprobe to the amplifier output, non-compliance may cause damages tooscilloscope inputs circuitry.
µ Before removing or installing any modules and connectors, disconnect
the amplifier from AC MAINS
the amplifier from AC MAINS
the amplifier from AC MAINS
the amplifier from AC MAINS
the amplifier from AC MAINS and measure the DC supply voltagesacross each of the power suppliy capacitors. If your measurement on anyof the caps is greater than 10Vdc, connect a 100
100W resistor across
the applicable caps to discharge them for your safety. Remember toremove the discharge resistor immediately after discharging caps. Do not
power up the amplifier with the discharge resistor connected
power up the amplifier with the discharge resistor connected
power up the amplifier with the discharge resistor connected
power up the amplifier with the discharge resistor connected
power up the amplifier with the discharge resistor connected.
µ Read these notes entirely before proceeding to any operation. These
notes are not comprehensive of all damages that possibly occur, butincludes some specifically advices, checks and adjustments relative tothis amplifier.
µ The output coupled transistors TR6-TR11 (MJ15022/B) and TR16-TR22
(MJ15023/B) are factory selected on V
=11V for NPN and I
<6.6mA at V
=-11V for PNP)
The selection is marked by a red digit (from 0 to B) representative of V
forward voltage categories, these are subdivided in 12 steps of 30mVeach.Only selected transistors must be used when replacing TR6-TR11 or
Only selected transistors must be used when replacing TR6-TR11 or
Only selected transistors must be used when replacing TR6-TR11 or
Only selected transistors must be used when replacing TR6-TR11 or
Only selected transistors must be used when replacing TR6-TR11 orTR16-TR22 and every coupled transistors must have the same digit.
TR16-TR22 and every coupled transistors must have the same digit.
TR16-TR22 and every coupled transistors must have the same digit.
TR16-TR22 and every coupled transistors must have the same digit.
TR16-TR22 and every coupled transistors must have the same digit.
µ The power supply utilizes a dual bipolar DC rail configuration with low and
high voltages; one positive and one negative low rail (+/-Vcc1) and onepositive and one negative high rail (+/-Vcc2).
Visual Check
Visual Check
Visual Check
Visual Check
Visual Check
µ Use compressed air to clear dust in the amplifier chassis.
µ Before proceed to supply the amplifier check visually the internal assem-
bly, if appears an evident damage find the most possible reasons thatcause it.
µ Check the wiring cables for possible interruptions or shorts.
µ If the damage has burnt a printed circuit board don't try to repair it, re-
place with a new one.
Test Instrument
Test Instrument
Test Instrument
Test Instrument
Test Instrument
µ Audio Generator
µ Dual Trace Oscilloscope
µ Digital Multimeter
1000W, 100
100W resistors
µ Temperature Meter
µ Connect the Variac between the PROTECTION board and the TF1 and
TF2 transformers and set it at zero voltage.
µ Set the amplifier in STEREO MODE and turn full clockwise the LEVEL
potentiometers.
µ Connect the audio generator to the channel inputs and set it to 1KHz
(0dB) sinusoidal signal.
µ Insert the temperature meter through the IC1 interstice located at centre
of heatsink.
µ The procedures that follow must be executed subsequently in the order
Supply Check
Supply Check
Supply Check
Supply Check
Supply Check
µ Remove the transformer secondary fuses (located on FUSE board), set
the Variac to the nominal mains voltage, check with the Multimeter thephase opposition between the secondaries of the two transformers (F1-F2,F3-F4), if not, verify the primary connections (T1?T4 on ProtectionsBoard).
µ Verify the AC supply voltages:
F1-F2=72±2Vac
F3-F4=128±3Vac.
µ Re-set the Variac at zero voltage, turn off the amplifier and put the fuses
back on its holders.
µ Connect the oscilloscope probes CH1/2 to the channel outputs, set both
to 20V/div. 200
µ Set up the Variac slowly monitoring the Outputs with the oscilloscope
CH1/2 connected, it should display the sinusoidal input signal amplifiedwith no distortions, if a distortion occur check the Driver and the PowerBoards as suggested in the ADVICES section.
µ If the protection trips, turn off the amplifier, wait some minutes and dis-
connect the supplies from the outputs modules (CN1 - CN2 - CN7 - CN8on POWER boards), continue to check the supplies.
µ CAUTION: Before re-connecting the output modules to the supplies,
CAUTION: Before re-connecting the output modules to the supplies,
CAUTION: Before re-connecting the output modules to the supplies,
CAUTION: Before re-connecting the output modules to the supplies,
CAUTION: Before re-connecting the output modules to the supplies,you must have the capacitors discharged for your safety: connect a
you must have the capacitors discharged for your safety: connect a
you must have the capacitors discharged for your safety: connect a
you must have the capacitors discharged for your safety: connect a
you must have the capacitors discharged for your safety: connect a100
100W resistor across the caps and remove the resistor just
100W resistor across the caps and remove the resistor just
100W resistor across the caps and remove the resistor just
100W resistor across the caps and remove the resistor just
100W resistor across the caps and remove the resistor just
after they are discharged.
after they are discharged.
after they are discharged.
after they are discharged.
after they are discharged.
µ Finally verify the DC supplies on Supply Board:
CN6 (+Vcc2)
=+89.5±2Vdc
CN8 (+Vcc1)
=+50±1.5Vdc
CN7 (-Vcc1)
=-50±1.5Vdc
CN2 (-Vcc2)
=-89.5±2Vdc
on Protections Board:
CN1 pin4-5-6 =+13.8±1VdcCN1 pin1-2-3 =-13.8±1Vdc
µ If one or more voltages don't correspond, check the rectifiers, capacitors
and transformers disconnecting them from circuitry, refer to schematics.
Channels Check
Channels Check
Channels Check
Channels Check
Channels Check
µ The channel A is facing the front and channel B the rear of the chassis.
µ These procedures are intended for one channel at a time, repeat these
operation for the other channel.
µ Verify, with the Multimeter, the insulation between the heatsink and the
transistors collectors.
SETUP:Connect the CH1 scope GND clip to CN5 (GND terminal).Connect the CH1 probe tip to CN6 (AMP output).Connect the CH2 probe tip to D2 cathode on POWER board.Set the LEVEL potentiometers full clockwise.The load resistor is disconnected.
µ INITIAL TEST:
INITIAL TEST:
INITIAL TEST:
INITIAL TEST:
INITIAL TEST:Increase slowly the Variac. The channel output signals must be symmetri-cal respect the GND without visible distortion and oscillation as shown inFig.1 Trace A. If there is a distortion read the section ADVICES andproceed to check the other channel.Verify that, when the heatsink temperature is less 50°c, the cooling fan
Trace B (20V/div.)
Trace A (20V/div.)
Trace C (20V/div.)