33
33
3
VERY IMPORTANT! READ THESE NOTES ENTIRELY BE-
FORE PROCEED TO ANY REPAIRING
PRECAUTION
• To prevent short circuit during any test, the oscilloscope must be EARTH insu-the oscilloscope must be EARTH insu-
the oscilloscope must be EARTH insu-the oscilloscope must be EARTH insu-
the oscilloscope must be EARTH insu-
latedlated
latedlated
lated, this occurs because some test require to connect its probe to the amplifier
output, non-compliance may cause damages to oscilloscope inputs circuitry.
• efore removing or installing any modules and connectors, disconnect the amplifierdisconnect the amplifier
disconnect the amplifierdisconnect the amplifier
disconnect the amplifier
from AC MAINSfrom AC MAINS
from AC MAINSfrom AC MAINS
from AC MAINS and measure the DC supply voltages across each of the power supply
capacitors. If your measurement on any of the caps is greater than 10Vdc, connect a
100ohm 70W resistor across the applicable caps to discharge them for your safety.
Remember to remove the discharge resistor immediately after discharging caps. DoDo
DoDo
Do
not power up the amplifier with the discharge resistor connectednot power up the amplifier with the discharge resistor connected
not power up the amplifier with the discharge resistor connectednot power up the amplifier with the discharge resistor connected
not power up the amplifier with the discharge resistor connected.
• Read these notes entirely before proceeding to any operation. These notes are not
comprehensive of all damages that possibly occur, but includes some specifically
advices, checks and adjustments relative to this amplified speaker.
• Do not check the amplifier with the speakers connected use the appropriate loadDo not check the amplifier with the speakers connected use the appropriate load
Do not check the amplifier with the speakers connected use the appropriate loadDo not check the amplifier with the speakers connected use the appropriate load
Do not check the amplifier with the speakers connected use the appropriate load
resistors only.resistors only.
resistors only.resistors only.
resistors only.
• E CAREFUL increasing the Variac you must not exceed the nominal mainsE CAREFUL increasing the Variac you must not exceed the nominal mains
E CAREFUL increasing the Variac you must not exceed the nominal mainsE CAREFUL increasing the Variac you must not exceed the nominal mains
E CAREFUL increasing the Variac you must not exceed the nominal mains
voltage plus its tolerance (see specifications) any upper voltage can be cause ofvoltage plus its tolerance (see specifications) any upper voltage can be cause of
voltage plus its tolerance (see specifications) any upper voltage can be cause ofvoltage plus its tolerance (see specifications) any upper voltage can be cause of
voltage plus its tolerance (see specifications) any upper voltage can be cause of
damage.damage.
damage.damage.
damage.
REMARKS
• All PEGASUS and POSEIDON P.A. systems use the same amplifier module with
different configuration, using the OS UPLOAD & COMPLETE TEST PROCEDURE ex-
plained further you can change a module setting to use it in another speaker; remem-
ber that also the adhesive labels applied to the control panel and to the output
connection will change, also note that you have to set some jumpers.
• As well each time you replace a DX OARD you have to use the OS UPLOAD &
COMPLETE TEST PROCEDURE explained further to upload the right speaker OS into the
flash memory.
• To make easy a repairing we have decided to divide the test procedure in two
chapter, the first chapter "AMPLIFIER TEST & ADJUSTEMENT" is relative to the POWER
AMPLIFIER ASSEM LY alone (SUPPLY and AMPLIFIER OARD with all other board
disconnected or removed), the second chapter "OS UPLOAD & COMPLETE TEST PROCE-
DURE" is relative to the entire module. This choice is due to the excessive time needed
to make a complete test that usually is not necessary when a fault is located on
amplifier assembly.
• To avoid R131, R132, R164, R165 burning: A SOLUTELY DO NOT CLIP THE AMPLI-A SOLUTELY DO NOT CLIP THE AMPLI-
A SOLUTELY DO NOT CLIP THE AMPLI-A SOLUTELY DO NOT CLIP THE AMPLI-
A SOLUTELY DO NOT CLIP THE AMPLI-
FIER OUTPUTS, OR ALSO DO NOT EXCEED THE MAXIMUM INPUT SENSITIVITY OFFIER OUTPUTS, OR ALSO DO NOT EXCEED THE MAXIMUM INPUT SENSITIVITY OF
FIER OUTPUTS, OR ALSO DO NOT EXCEED THE MAXIMUM INPUT SENSITIVITY OFFIER OUTPUTS, OR ALSO DO NOT EXCEED THE MAXIMUM INPUT SENSITIVITY OF
FIER OUTPUTS, OR ALSO DO NOT EXCEED THE MAXIMUM INPUT SENSITIVITY OF
+4d u. +4d u.
+4d u. +4d u.
+4d u. For this reason any further test is made at max 0d u, a more secure level.
• The POWER AMPLIFIER ASSEM LY has two identical amplifiers in MOSFET CLASS A
technology, these are named CH1 an CH2, when are used in the PEGASUS-212 and
POSEIDON-212 they work indipendently for HIGH and LOW speakers (remark that the
HIGH channel has a lower gain leaving unmounted J3 on INTERFACE OARD), when
are used in the PEGASUS-118 sub they work in bridge configuration (remark that the
phase inversion is made by the DX OARD), when are used in the POSEIDON-218 sub
they work indipendently but with phase inverted to drive the push-pull speaker con-
figuration (remark that the phase inversion is made by the DX OARD).
• During its normal duty each speaker box has a specific LONG TERM PROTECTION
LIMITER, this limiter is set up to avoid the voice coil breaking due to excessive and
long time power handling of each specific cone or compression driver. Its intervention
is un-audible because the DSP sense the power handling and reduce it gradually. As
soon as a normal working condition is restored, the power is gradually taken back to
the nominal level. During the test procedures all limiters are disabled.
VISUAL CHECK
• Check the speakers for any damaging (cone-breaking, interruption or further).
• efore proceed to supply the amplifier check visually the internal assembly, if
appears an evident damage find the most possible reasons that cause it.
• Check the wiring cables for possible interruptions or shorts.
• If the damage has burnt a printed circuit board don’t try to repair it, replace with a
new one.
MOSFET REPLACEMENT NOTE
All Mosfet rails are made by matched components, the following table summarize the
selections:
Id. VTGS Range Id. VTGS Range Id. VTGS Range
A 3.450 ÷ 3.499 3.500 ÷ 3.549 C 3.550 ÷ 3.599
D 3.600 ÷ 3.649 E 3.650 ÷ 3.699 F 3.700 ÷ 3.749
G 3.750 ÷ 3.799 H 3.800 ÷ 3.849 I 3.850 ÷ 3.899
J 3.900 ÷ 3.949 K 3.950 ÷ 3.999
As SPARE PART REPLACEMENT GM supply only a selected quartet of specified type P
IRFP9240 (GM code SKK090007) or type N IRFP240 (GM code SKK090006).
In other words you always have to replace an entire rail of final transistors, because
same VTGS range is important to drive them together, but different rails can have
different VTGS ranges.
TEST INSTRUMENTS
• Sinusoidal & Pink Noise Audio Generator
• Dual Trace Oscilloscope
• Digital Multimeter
• 2x 8ohm 500W, 100ohm 70W resistors
• Variac (0÷250Vac)
To execute the AMPLIFIER TEST PROCEDURE are also needed the following tools:
• Two 26 poles DIN41651 or equivalent headers
• Two female mono jack
• Two 20cm lenght shielded cables
The two headers must be assembled as follow:
• A 6 poles DIN41651 p=2.54 female header assembled as follow:
To execute the OS UPLOAD & COMPLETE TEST PROCEDURE are also needed the
following tools:
• A Windows 98/NT/XP personal computer with a RS232 communication port free.
• O.S. UPGRADE CDROM version 2/2003 or further (GM code 270279)
• A loopback RS232 D -9 connector (shorts pin 2 and 3)
• A loopback RS485-RS232 Micromatch header (shorts pin 1-6 and pin 2-4), using that
you skip the RS485 check
• Or to make a complete check you must have the RSC SERIAL CONVERTER Kit (GM
code 951361 for 230Vac or 951362 for 115Vac) and a suitable Y cable.
TECHNICAL SPECIFICATIONS
Power Requirements (EU): (230Vac+5%/-10% 50Hz) 900VA
Power Requirements (US): (115Vac+5%/-10% 50/60Hz) 900VA
Max CH1 Out Power*: (8ohm) 400W
Max CH2 Out Power*: (8ohm) 400W
Max ridge Out Power***: (16ohm) 800W
Frequency Response**: 10Hz ÷ 20KHz
Nominal Input Sensitivity: (+4d u) 1.229VRMS
Amplifier Input Sensitivity: (+4d u single input) 1.229VRMS
Max signal before digital clip: (+19d u) 6.91VRMS
System digital delay: (approx.) 1.4mS
Input Impedance: (balanced) 30Kohm
(unbalanced) 15Kohm
Voltage Gain: 33±1d
IMD: (SMPTE 60Hz/7KHz 4:1) <0.1%
THD: (THD+N) <0.1%
S/N Ratio: (unweighted) >100d
* Note: measured with the IHF standard method without limiters. The RMS power is
limited by the DX OARD and it is different for each model, refer to the OS UPLOAD &
COMPLETE TEST PROCEDURE explained further.
** Note: the frequency response depends by the model and the selected preset, to
view the responses you can install the DX-EDITOR program in a Windows based
personal computer.
*** Note: Used on "Pegasus 118 Sub" model only, the phase invertion is achieved by
software on DX oard.
AMPLIFIER TEST PROCEDURES & ADJUSTMENTS
All system amplifiers have the same electronics but different configurations, in the
COMPLETE TEST PROCEDURE these configurations are explained entirely. The proce-
dures in this chapter are relative only to the Supply and Amplifier oards, all other
boards must be removed before to go over; also only in the PEGASUS-212 model you
have to remove temporarely the JMP5 and JMP6 jumpers.
SETUP
• Connect the Variac between the mains and the amplifier and set it at zero voltage.
• Disconnect all the Speakers.
• Insert the CONN2 and CONN4 HEADERS into the respective connectors.
• Insert the VOUT & IAS HEADER into the respective connector.
• Connect the audio generator to each channel input and set it to 1KHz sinusoidal
signal, level set to zero.
• Connect the oscilloscope probe to the OUT1 and OUT2, clip to - and tip to +, before
RE100 and RE200, initially set it to 5V/div. 2µS/div. and move the vertical scale from 5
to 20V/div. when required.
• The load resistor is disconnected.
• The procedures that follow must be executed subsequently in the order specified.
SUPPLY CHECK
• Verify with the Multimeter the insulation between the heatsink (fixing screws) and all
mosfet drains (pin2) (T110, 111, 112 , 113, 118, 119, 120, 121, 210, 211, 212 , 213,
218, 219, 220, 221,).
• Verify with the Multimeter the NTC resistor value, it must be between 17Kohm and
19Kohm.
• Remove the transformer secondary fuses, set the Variac to the nominal mains
voltage, check with the Multimeter the AC supply voltages in the screws headers:
CONN2 ROWN-WHITECONN2 ROWN-WHITE
CONN2 ROWN-WHITECONN2 ROWN-WHITE
CONN2 ROWN-WHITE =60±2Vac.=60±2Vac.
=60±2Vac.=60±2Vac.
=60±2Vac.
CONN3 RED-YELLOWCONN3 RED-YELLOW
CONN3 RED-YELLOWCONN3 RED-YELLOW
CONN3 RED-YELLOW =60±2Vac.=60±2Vac.
=60±2Vac.=60±2Vac.
=60±2Vac.
CONN4 YELLOW-YELLOWCONN4 YELLOW-YELLOW
CONN4 YELLOW-YELLOWCONN4 YELLOW-YELLOW
CONN4 YELLOW-YELLOW =18±1Vac.=18±1Vac.
=18±1Vac.=18±1Vac.
=18±1Vac.
CONN4 ORANGE-ORANGECONN4 ORANGE-ORANGE
CONN4 ORANGE-ORANGECONN4 ORANGE-ORANGE
CONN4 ORANGE-ORANGE =10±0.5Vac.=10±0.5Vac.
=10±0.5Vac.=10±0.5Vac.
=10±0.5Vac.
CONN4 LUE- LUECONN4 LUE- LUE
CONN4 LUE- LUECONN4 LUE- LUE
CONN4 LUE- LUE =10±0.5Vac.=10±0.5Vac.
=10±0.5Vac.=10±0.5Vac.
=10±0.5Vac.
• Re-set the Variac at zero voltage, turn off the amplifier and put the fuses back on its
holders.
• Set the generator level to -20d u (77.5mVRMS).
• Set up the Variac slowly at about 50Vac (EU) or 25Vac (US) monitoring the
oscilloscope screen, it should display the output signals of about 5Vpp without
distortion and any DC voltage; increase the Variac, after a range of instable operation,
at about 90Vac (EU) or 45Vac (US) starts the fan and output signals are about 10Vpp,
increasing further the Variac at about 150Vac (EU) or 75Vac (US) the relais go on,
when nominal votage is reached increase the input signal to 0d u, corresponding the
output signal increase to 100Vpp for each channel.
• Verify the DC supplies as follow:
CONN1 pin8-9 (+Vcc)CONN1 pin8-9 (+Vcc)
CONN1 pin8-9 (+Vcc)CONN1 pin8-9 (+Vcc)
CONN1 pin8-9 (+Vcc) =+82±2Vdc=+82±2Vdc
=+82±2Vdc=+82±2Vdc
=+82±2Vdc
CONN1 pin13-14 (-Vcc)CONN1 pin13-14 (-Vcc)
CONN1 pin13-14 (-Vcc)CONN1 pin13-14 (-Vcc)
CONN1 pin13-14 (-Vcc) =-82±2Vdc=-82±2Vdc
=-82±2Vdc=-82±2Vdc
=-82±2Vdc
CONN1 pin7CONN1 pin7
CONN1 pin7CONN1 pin7
CONN1 pin7 =+24±1Vdc=+24±1Vdc
=+24±1Vdc=+24±1Vdc
=+24±1Vdc
CONN1 pin6CONN1 pin6
CONN1 pin6CONN1 pin6
CONN1 pin6 =+5±0.5Vdc=+5±0.5Vdc
=+5±0.5Vdc=+5±0.5Vdc
=+5±0.5Vdc
