RAM Trucks 1500 User manual

SERVICE MANUAL
P-5343-006
QXPSDoc
1/07
© 2007 by C.E. Studio-2 s.l. - Spain (EEC)
http://www.ramaudio.com
e-mail: [email protected]
Professional Power Amplifiers
SSeries
1500-2000-3000-4000-6000
3004-4004-4044-6004-6044

WARNING:
The exclamation point inside an equilateral triangle indicates
the existence of internal components whose substitution may
affect safety.
The lightning and arrowhead symbol warns about the presen-
ce of uninsulated dangerous voltage.
To avoid fire or electrocution risk do not expose the unit to rain or moisture.
To avoid electric shock, do not open the unit. No user serviciable parts inside.
In the case of disfunction, have the unit checked by qualified agents.
SAFETY PRECAUTIONS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
©2010 by C.E. Studio-2 s.l.
Pol.Ind. La Figuera
C/ Rosa de Luxemburgo, 34
46970 Alaquas - Valencia - SPAIN
Phone: [phone]
Fax: [phone]
http://www.ramaudio.com
e-mail: [email protected]
RAM Audio®, PMS™, SSP™, ICL™and QuantaPulse™is registered trademarks of C.E. Studio-2 s.l.. All
other names are trademarks of their respective companies.

The S series is a hi power amplifier composed by 2 or 4 channel class H technology fed by a switching power
supply. It has twin male-female XLR back pannel input connectors per channel with the posibility to work in ste-
reo, parallel or bridge modes. Has too a gain selection switch which permits work at 26, 32 or 38 dB, and a
selectable subsonic filter. It has four front pannel indicators per channel to inform the amplifier operative status
and a potentiometer attenuator per channel to adjust the output level.
At the back pannel there are the output Speakon audio connectors. It has too a three wire power mains cord
to connect the amplifier to a properly voltage and current rated mains network with earth connection.
Audio circuit description
The circuit input has a balanced (differential) amplifier to reject the common mode noise added to the audio
signal. Then the signal passes through the gain amplifier, subsonic filter and the clip limiter gain control that is
innactive unless the amplifier will be in clipping situation due to excesive input signal.
Following this, the signal arrives to the properly named power amplifier. This circuit is comprised by an opamp
that provides the error signal to a class A voltage amplifier that feeds the common emitter power amplifier. The
feedback signal from the output is returned to the opamp that performs the corrections necessary to replicate at
the output the amplified input signal.
Inside the class A voltage amplifier is inserted a bias control circuit that provides a operating point to the follo-
wing power stage and compensates the thermal derating of silicon PN junctions avoiding the thermal runaway
problem.
Inside the power stage is implemented a current limiting circuit that avoid to excessive power transistors disi-
pation in case of shortcircuit or very low impedance loads. The actuation of this circuit limits the output to secure
levels.
Following the power amplifier circuit there are a zoobel network and a coil in series that provides correct
amplifier performing and inconditional stability in case of excesive inductive or capacitive loads.
The power supply simetrical rails come from the class H conmutation matrix. This matrix is composed by
mosfet transistors and diodes and selects the most suitable voltage level to feed the amplifier depending of the
output signal level. This operating method leads to a very low power disipation in the power transistors. The mos-
fets in the conmutation matrix are commanded by a voltage comparator which output depends of the output sig-
nal and the supply rails voltage.
There is an on board fan control to regulate the fan speed depending of temperature that is sensed via a ntc
thermistor attached to the heatsink.
Regarding to the protection systems there are several blocks which comprise:
- DC protection, via a low pass filter that detects DC or very low frequency signal at the output.
- Shortcircuit protection.
- High temperature protection, via the ntc thermistor and a comparator with a fixed absolute reference.
- Power on delay, via a timer that sets the time between power on and full operative status.
- Clip limiter
Regarding the front pannel indicators, all of them are commanded from the audio power section, providing
visual information for fault, ok status, high temperature, clipping and input signal existence.
GENERAL DESCRIPTION

GENERAL DESCRIPTION
Power supply description
The amplifier has a switching power supply fully independent and self commanded and protected, to feed the
DC voltage to the audio power section.
The mains voltage passes through an interference filter to filter out both the switching noise to go out and the
mains interference to come in. Then is located the main fuse and power on switch that when closed permits the
charging of primary capacitors via the soft start circuit and the diode bridge. After a few seconds the soft start cir-
cuit is bypassed and full mains voltage is applied to the primary side. From the capacitors DC voltage an inverter
implemented by two power transistors creates a high frequency square wave that feeds the high frequency trans-
former primary winding. From the multiple secondary windings several dc voltages are built via the correspon-
ding rectifiers, inductances and capacitors too feed the audio power section.
The control of the entire power supply is done from a separate board with contains all the necessary circuitry.
This circuitry is fed via its own power supply, fully independent, located in the same board. Inside the board are
located the power transistor drivers and clock generator for the high frequency signal. Beside, are located too the
soft start control and the power supply protections, that are:
- Power off or mains voltage absence detector
- Low/high mains voltage detector
- Excessive peak or average primary current detector via a current sensor.
- DC output shutdown
All these protections act stopping the high frequency oscillation and restarting the system configuring a very
fast acting way to protect the power supply. The current detector circuit try first to lower the amplifier gain to
reduce the current consumption, stopping the oscillation as a seconday action. Also, the audio section can send
information to the power supply to stop the oscillation, if you have DC output.

TECHNICAL SPECIFICATIONS
Technical Specifications
S-1500 S-2000 S-3000 S-4000 S-6000 S-3004 S-4004 S-4044 S-6004 S-6044
Output Power
1kHz, 1.0% THD+N
@ 2Ω2x 880 W 2x 1190 W 2x 1570 W 2x 1950 W 2x 2950 W 4x 700 W 4x 980 W - 4x 1440 W -
@ 4Ω2x 575 W 2x 790 W 2x 1100 W 2x 1380 W 2x 2025 W 4x 500 W 4x 670 W 4x 975 W 4x 1000 W 4x 1480 W
@ 8Ω2x 325 W 2x 460 W 2x630 W 2x 810 W 2x 1250 W 4x 300 W 4x 430 W 4x 690 W 4x 620 W 4x 1015 W
Bridge @ 4Ω1760 W 2380 W 3140 W 3900 W 5900 W 2x 1400 W 2x 1960 W - 2x 2880 W -
Bridge @ 8Ω1150 W 1580 W 2200 W 2760 W 4050 W 2x 1000 W 2x 1340 W 2x 1950 W 2x 2000 W 2x 2960 W
Pink Noise 12dB C.F.
@ 2Ω2x 975 W 2x 1360 W 2x 2060 W 2x 2460 W 2x 4225 W 4x 890 W 4x 1170 W - 4x 2080 W -
@ 4Ω2x 610 W 2x 880 W 2x 1240 W 2x 1600 W 2x 2600 W 4x 580 W 4x 820 W 4x 1230 W 4x 1280 W 4x 2110 W
Frequency Response
Power Bandwidth ±0.25dB 20Hz-20kHz
Phase Response
@ 1 watt 20Hz-20kHz ±15 deg
Total Harmonic Distortion
20Hz-20kHz <0.05%
Intermodulation Distortion
SMPTE <0.05%
Damping Factor
20-500Hz @8Ω>500
Crosstalk
20Hz-20kHz >75 dB
Voltage Gain 26/32/38 dB
Sensitivity
Rated Power @ 8Ω(V) 2.6/1.3/0.6 3.0/1.5/0.8 3.6/1.8/0.9 4.0/2.0/1.0 5.0/2.5/1.3 2.6/1.3/0.6 3.0/1.5/0.8 3.7/1.9/0.9 3.5/1.8/0.9 5.0/2.5/1.3
Signal-to-Noise Ratio
20Hz-20kHz 112 dB 113 dB 115 dB 116 dB 118dB 112dB 113dB 116dB 116dB 118dB
Required AC Mains
230 V - 50 Hz (idle) 0.5 A 0.5 A 0.5 A 0.5 A 0.5 A 0.5 A 0.5 A 0.5 A 0.5 A 0.5 A
@ 4Ω(1/8 rated power) 4 A 4.8 A 6.2 A 7.5 A 10.5A 6 A 7.5 A 11A 10.5A 15A
Dimensions
W x H x D (mm) 483x89x310
W x H x D (inches) 19x3.5x12.2
Weight
Net (Kg- Lbs) 8-17.6 8-17.6 8.5-18.7 8.5-18.7 8.6-18.9 8.5-18.7 8.5-18.7 8.5-18.7 8.6-18.9 8.6-18.9
Protections
Soft-start, Turn-on Turn-off transients, Muting at turn-on, Over-heating, DC, RF, Short-circuit, Open or mismatched loads, Overloaded
power supply, ICL™, PMS™, SSP™

QUICK REPAIR PROCEDURE
MAINS CURRENT LIMITER:
To test the power amplifier it is advisable to implement a mains current limiter to avoid any shortcircuit, in
case the unit has damaged parts that have not been fixed. The most effective and easy solution is to use a pair
of 100W light bulbs arranged in parallel, and placed in series with the mains supply. If everything is OK, when
you switch on the power supply the bulbs will light until the primary capacitors are fully charged and then they
will bright softly enabling enough current to pass through to reach a normal start up of the supply.
POWER SUPPLY:
When the switching power supply breaks, the usual consequences are that both IGBT transistors (Q2 & Q3)
explode and that the IR2110S ic (U12) from the control board (the IGBT driver) gets damaged. It may be possi-
ble that more ic's from the control board get damaged too (U15 SG3525 or U9 NE555), but this is not usual.
Once an IGBT breaks, it is absolutely necessary to change the IR2110S ic too, even if it seems to be OK. If the
IR2110S ic is not replaced, the IGBTs will damage again. If you have not the requiered SMT tools to change any
SMD component, the best option is to change the complete control board.
To change the IGBTs follow the next steps: take out the power supply unit from the amplifier by removing the
screws at the PCB. Put the power supply PCB upside down and unscrew the 4 screws that are on the IGBT
heatsink, remove both switching transistors by cutting their legs and clean the pad holes of solder. Screw another
pair of transistors to the heatsink with their corresponding mica insulators, and place the heatsink again into its
location by fastening the other two screws and soldering the transistors legs to the PCB. Above manipulations
must be done with utmost care in order to have a successful repair. Check that the transistor collector is insula-
ted from the heatsink and that this heatsink is located parallel to the other one. Change the control PCB and do a
visual test of the rest of the components.
Test too the integrity of secondary rectifiers using a multimeter in "diode mode". Test also they are insulated
from the heatsink. (D9, D10, D11, D12, D13, D14, D15 and D16).
To test the power supply it is advisable to implement a little bench to avoid any risk because of lack of insula-
tion from direct ac mains voltage in most of the circuit. We recommend to use a transformer with turns ratio 1:1
to isolate the mains from the power supply (remember that the 230 V ac is still present) but now you are isolated
from earth. Connect the power supply through the current limiter (bulbs in series with the mains) and you must
look at the control board green led to check that the 15Vdc control board supply is operating and that there is not
any shorted ic. You can measure then the voltages at the output connector, they will be lower than expected
because the voltage drops at the bulbs. The voltages are the following:
S 1500: ±49V / ±81V
S 2000: ±49V / ±98V
S 3000: ±65V / ±114V
S 4000: ±65V / ±130V
S 6000: ±54V / ±108V / ±162V
S 3004: ±49V / ±81V
S 4004: ±49V / ±98V
S 4044: ±65V / ±130V
S 6004: ±38V / ±76V / ±115V
S 6044: ±54V / ±108V / ±162V
When you are sure that the unit is OK, you can short the light bulbs with the aid of a switch and measure the
correct voltages.
Bear in mind that it is possible that one of the audio power section may be damaged. Test there is no short at
the power transistors. Verify also there is not any ground track opened. When switching the amplifier on, measu-
re that the voltage at the power audio section emitter resistors correspond to the first class H level. Check with
an oscilloscope, with the probe attached to the emitter resistors, that when applying signal the power supply will
change in steps as expected. Test both polarities.
It is highly recommended to test the entire amplifier with the light bulbs in series with the mains supply to
avoid further power supply breakings. If the amplifier start up correctly then you may short the light bulbs and
apply signal to obtain power from the amp.

QUICK REPAIR PROCEDURE
POWER AUDIO SECTION:
When the audio section breaks, the usual consequences are that some final transistor or/and driver transistor
gets shortcircuited. It is possible to get also some class h conmutation mosfet transistor or diode shortcircuited.
To check it you have to use a multimeter in diode mode or resistance measure. If the final transistors are OK you
can measure around 10ohms between the base and the emitter and very high resistance between collector and
emitter. In the driver transistor you have to measure around 230ohms between base and emitter.
If you have a final transistor shortcircuited, you can measure a very low resistance between collector and
emitter of all final transistors, but the lower resistance indicates what is exactly the transistor shortcircuited,
because this has a direct shortcircuit and the other paralleled transistors have arround 0.66ohms (two serie
emittter resistor). Cut the leads of this shortcircuited transistors and continue testing if you have some more tran-
sistor broken.
Also, you may have only the driver transistor shorcircuited, then you can measure this direct shorcircuit bet-
ween collector and emitter of this transistor, and arround 10ohms betweem the collector and emiter of the all final
transistors. Also it is possible to have the driver and some final transistor broken. Cut the leads of any device
broken and continue testing until you are sure you have not any more device shorcircuited.
You have to check also the mosfet transistor and diode from the class H switch. They are placed on the same
heatsink nearest to the fan. Check you have not a shortcircuit between the drain and the source of the mosfet
and check the diode works correctly.
To change any device broken you have remove the heat sinks needed to reach it. Now remove his screw and
place the new one with thermal silicone. Clean the surface if needed. Tight the screew using a screewdriver with
a torque arroud 1.3N/m.
Its is possible you have to change some burn resistor. Check visually specially the 0.33ohms emitter resistor
and the 10ohms/1W driver emitter resistor, and if you have some dark resistor measure it and change if needed.
After change all broken devices, check you have not any shorcircuit between the outputs (heat sink), rails and
ground. It is highly recommended to test the entire amplifier with the light bulbs in series with the mains supply to
avoid further power module breakings. If the amplifier start up correctly then you may short the light bulbs and
apply signal to obtain power from the amp. Use 1kHz sinusoidal signal and 4 ohms dummy load to test all works
perfectly. Check specially the switch rail works correctly, and you have not any instability when you clip the out-
put.
If the signal input clips before as expected, perhaps you can have some problem with the SOA limit circuit.
Some small SMD transistor can be broken. Check if you have problems with the positive or negative semicycle
and test the SOA limit components, placed in front of the heat sink. This circuit controls the maximun transistor
current and you can test it working with a very low impedance load (1ohm for example) and a small input signal.
you can see this system limits the output to a secure value.
Bias adjusting: you may adjust the Bias point only if requiered. To do it, connect the output to a 4ohms
dummy load. Place a 10kHz sinusoidal signal in the input, and setting the oscilloscope at 1V/div scale, adjust the
level to have 4Vp output. You have to adjust the PT1 trimer to remove the cross distortion. Take in account you
have to adjust to have the minimun current needed to remove the crossover distortion, because if you adjust it
with excesive bias current the power amplifier will work very hot or also can become hot without signal.

1 2 3 4 5 6 78
A B C D
8
7654321
D
C B A
FBKB OUTB M+ M-
RMSLIM
NTC SenseBRIDGEA
VOUT_B IOUT_B TEMPA_B
CLIP_B
TEMP_B
SIGNAL_B
INB+ INB-
Channel B Channel B.Sch
FBKA FBKB FBKC FBKD
OUTA
OUTB OUTC
OUTD
M+ M-
RMSLIM
NTC Sense
TEMPA_A
CLIP_A
SIGNAL_A
VOUT_B IOUT_B TEMPA_B
CLIP_B
IOUT_A
TEMP_B
VOUT_A
SIGNAL_B
TEMP_A
TEMPA_D
CLIP_D
SIGNAL_C
VOUT_C IOUT_C TEMPA_C
CLIP_C
IOUT_D
TEMP_C
VOUT_D
SIGNAL_D
TEMP_D
INA+ INA- INB+ INB-
INC+
INC-
IND+
IND-
VRAIL_A
Comun Comun.Sch
FBKA OUTA M+ M-
RMSLIM
NTC SenseBRIDGEA
VOUT_A IOUT_A TEMPA_A
CLIP_A
TEMP_A
SIGNAL_A
INA+ INA-
VRAIL_A
Channel A Channel A.Sch
FBKC OUTC M+ M-
RMSLIM
NTC SenseBRIDGEC
VOUT_C IOUT_C TEMPA_C
CLIP_C
TEMP_C
SIGNAL_C
INC+
INC-
Channel C Channel C.Sch
FBKD OUTD M+ M-
RMSLIM
NTC SenseBRIDGEC
VOUT_D IOUT_D TEMPA_D
CLIP_D
TEMP_D
SIGNAL_D
IND+
IND-
Channel D Channel D.Sch
Control_S Control_S.Sch
RAM Audio - S Series S3004 - S4004 - S4044 Signals Block Diagram
Sheet 1 of 8DWG No.
DRAWN DESIGN REPLACE REPL. BY

12345678
A B C D
8
7654321
D
C B A
R95 10k
R83 10k
R96 10k
R73 10k
C61 100p/50V
C40 100p/50V
GsA
C24
10u/50V
C19
10u/50V
R1 10k
GsA
R47 47k
GsA
+15
Q143 PZT2222A
Q132 PZT2907A
R437 75R R450 75R
R439 4R7/1W
R442 22R/1W
C196
470p/50V
C201
470p/50V
G1A
C202
33n/100V
R452 150k
R432 330R
R428 1k8 R427 100k
R426 15k
R448
220R
R449 10R/1W
R8
0R33/4W
R9 0R33/4W
C203
10u/35V
D101 BAS85
D103 1N4148
D116 1N4148
D107
MURS160T3
D113
MURS160T3
Q146 5551
Q145 5401
Q14 MJE15033
Q9
MJW21195
Q10
MJW21195
G1A
R420 39k R422 2k
R404 330R
R402 1k8
R417 220R
R423 10R/1W
R5 0R33/4W
R7 0R33/4W
R401 100k
R397 15k
C191
10u/35V
D92 MURS160T3
D90 1N4148
D94
1N4148
D98 MURS160T3
Q133 5401
Q2 MJE15032
Q3
MJW21196
Q5
MJW21196
Q134 5551
D83
BAS85
3 2
1
8 4
U7A 5532
C177 47u/16V
G1A
D115
1N4148
R382 3k01
R399 12k
RV2 500R
R383 20k
+15
R398
620R
D82 1N4148 D77 1N4148
R381 20k
-15
C188
100p/50V
Q150 MMBTA42 Q140 MMBTA92
R421 12k
M+
Q8
MJF15030
R446 100R
C206 100n/100V
G1A
+15
R447 2k R441 39k
C204
2n2/100V
Q147 5401
R10
0R33/4W
Q11
MJW21195
R409 100R
C192
100n/100V
G1A
-15
R407 150k
G1A
C194
2n2/100V
Q135 5551
R6 0R33/4W
Q4
MJW21196
1 2
J24 IN.A
C38 100n/100V
C35 220n/50V
C39
100n/100V
5 6
7
U7B 5532
R56 47k
GsA
R109 NC
R94 1k5
GsA
R82 1k5
C43
470p/50V
R64 15k
NTC Sense
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16
J19 Adap t Out
+15 -15 G15
Gadap
CLIP_INA TEMP_INA TEMP_AINA
IOUT+A IOUT-A
OUTA
1 2 3
J14 Adap t In 4
1 2 3
J13 Adap t In 1
1 2 3
J7 Adap t In 3
1 2
J10 Adap t In 2
OUTA
OUTA
IOUT+A IOUT-A
TEMP_AINA
S4B GAB
R93 475R
26dB
32dB
38dB
R42 20k C44
100p/50V
GsA
3 2
1
84
U5A 5532
R84 4k7
GsA
R97 1k5
C47 100u/16V
R85 1k
C57
470p/50V R118
12k
R101100R
GA
R100 100R
GA
R99 39k
+15
R66 15k C36 10p/100V
5 6
7
U5B 5532
R48 15k
GsA
C52 22p/50V
R126 3k3
+15
Q64 5551 Q60 5401
R67 7k5 R59 1k
GA
C54 470p/50V
Q58 5551
Q57 5551
R49
1k5
R58 1k5
-15
Q65 5401
D1D LEDA
R117 20k
R98 390k
C46
10u/35V
-15
8 9
S6H SWAB
710
S6G SWAB
611
S6F SWAB
FBKA
LIMA
ERRORA
3 2
1
84
U6A LM393
R74 10k
+15
R68 4k7
R87 1k5
D1B LEDA GA
R102 10k
D9 1N4148
C30 100n/100V
GA
5 6
7
U6B LM393
R61 2k
R70 4k7
R128 47k R127 15k
Gadap
ERRORA
R57 300k OUTA
TEMP_INA
R116 3k3
C55 10u/16V
R55 470k R108 75k GA
-15
Q63 5401
R72 1k5
C42 10u/16V
GA
D1A LEDA
GA
R32 3k3
+15U1 -15U1
+15U2 -15U2
+15
R123 100R C64
47u/16V
-15
R65 100R
C51 47u/16V
GA
+15U1 -15U1
+15
R110 100R C45
47u/16V
-15
R31 100R
C27 47u/16V
GA
+15U2 -15U2
C48 10u/35V C29 10u/35V
GA GA
+15
-15
R178 10k
Q80 5551
-15
R196 10k
+15
SIGNAL_INA
SIGNAL_INA
Q67 5551
R75 47k
-15
+15
R43 3k3
GA
R60 82k5
+15
BRIDGEA
+V2AC
Gadap Gadap
VRAIL_A VOUT_A IOUT_A TEMPA_A CLIP_A SIGNAL_A TEMP_A
INA- INA+
t
RT1 NTC 10k
G1A
M-
MA
R69 1M
RMSLim
LIMA
D1C LEDC
M+
D7 1N4148
R44 20k
GA
Q61 5551
GA
R50 47k
R89 10k
Q69 5401
R71 100k
+15
R113 3k92
-15
R13739k
D24
1N4148
R88 1M
-15
D13 1N4148
Q72 MPSA13
+15
D23 1N4148
R112 100k
-15
D15
1N4148
Q66 MPSA13
+15
R121 2k7
D16 1N4148
D20 1N4148
LIMA MSA
MA
GsA
MSA
+15
LIMA
CLIP_INA
R111 100R R86 475R
R11947k Q71
5401
Q74 MPSA13
R125 100k
GA
R124 680R
GA
+15
D17 1N4148
C28 100p/50V
C31 100u/16V
3 2 4
8 5
1
7
116
U8A LM13700M
-15OTA1+15OTA1
+15
R135 100R C56
47u/16V
-15
R120 100R
C72 47u/16V
GB
+15OTA1 -15OTA1
T1A
T2A
T3A
T4A
T5A
T6A
T7A T8A
T9A
T10A
T11A
T12A
T14A
T15A
T16A
T18A
T19A
T20A
T21A T22A
T24A
R46 4k7
GA
B
C E
Q59 SST111
+15
R103 3k3
C25 nc
C26
nc
C53 nc
R104 47k
LIMA2
LIMA2
-15
GA
C62 470n/50V RAM Audio - S
S3004 - S4004- S4044 Channel A Schematic
Sheet 2 of 8DWG No: Channel A.Sch
DRAWN DESIGN REPLACE REPL. BY
Q7
IRFI1310N
Q139 5551
Q138
5551
Q137 5551
Q136 5401
R419 15k
R405 47R
R411 7k5
R418 3k92
R412 10k
R416 10k
R414 47k
R415 47k
R413 47k
R410 10k
D93 12V
D100 15V
D99 12V
D91
1N4148
D88 1N4148
D87
1N4148
D97
1N4148
D96 1N4148
C193
22u/16V
C186 27p/100V
C187 1n/100V
Q141
5401
R424 NC
R406 1R/1W
D89 FFPF30U60S
C189
100n/100V
OUTA
C190100p/100V
-V2AC
-V1AC
Q13
IRFI1310N
R431 15k
R445 47R
R444 10k
R443 3k92
R440 2k
R438 10k
R434 47k
R435 47k
R429 100k
R433 47k
R430 10k
Q144
5551
Q149
5551
Q142
5551
Q151 5401
Q148
5401
D112 15V
D105 12V
D106
1N4148
D1171N4148 D111
1N4148
D109
1N4148
D108
1N4148
D104 1N4148
D110
1N4148
C205
22u/16V
C197 27p/100V
C199 1n/100V
+V2AC
+V1AC
R436
1R/1W
D102 FFPF30U60S
C200 100n/100V
C198
100p/100V
OUTA
+V2AC
Q1
MJF15031
R388 475R

12345678
A B C D
8
7654321
D
C B A
R201 10k
R189 10k
R202 10k
R18410k
C108 100p/50V
C87 100p/50V
GsB
C70 10u/50V
C67
10u/50V
R2 10k
GsB
R190 47k
GsB
+15
G1B
R568 150k
R603 330R
R604 1k8 R605 100k
R608 15k
R20 0R33/4W
R21
0R33/4W
C264
10u/35V
D221 BAS85
D219
MURS160T3
Q217 5551
Q215 5401
Q36 MJE15033
Q37
MJW21195
Q38
MJW21195
G1B
R542 39k R543 2k
R564 330R
R566 1k8 R17
0R33/4W
R19 0R33/4W
R567 100k
R569 15k
C245
10u/35V
D186
MURS160T3
Q200 5401
Q29 MJE15032
Q30
MJW21196
Q32
MJW21196
Q199 5551
D195
BAS85
3 2
1
8 4
U17A 5532
C300 47u/16V
G1B
D203
1N4148
R689 3k01
R684 12k
RV4
500R
R688 20k
+15
R683 620R
D273 1N4148 D274 1N4148
R691 20k
-15
Q203 MMBTA42 Q185 MMBTA92
R552 12k
M+
Q42
MJF15030
G1B
+15
R576 2k R584 39k
C263
2n2/100V
Q212 5401
R22 0R33/4W
Q39
MJW21195
R535 150k
G1B
C246
2n2/100V
Q193 5551
R18
0R33/4W
Q31
MJW21196
1 2
J28 IN.B
C85 100n/100V
C81 220n/50V
C86
100n/100V
5 6
7
U17B 5532
R155 47k
GsB
R208475R
R2001k5
GsB
R1881k5
C90
470p/50V
R168 15k
NTC Sense
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16
J20 Adap t Out
+15 -15 G15
OUTB
OUTB
IOUT+B
IOUT-B
TEMP_AINB
S4A GAB
R199NC
26dB
32dB
38dB
C109 100p/50V
GsB
3 2
1
84
U15A 5532
R221 4k7
GsB
R222
1k5
C110 100u/16V
R216 1k
C112
470p/50V
R143 12k
R160100R
GB
R159 100R
GB
R157 39k
+15
R19115k C10410p/100V
5 6
7
U15B 5532
R192 15k
GsB
C99 22p/50V
R224 3k3
+15
Q84 5551 Q82 5401
R172 7k5 R173 1k
GB
C95 470p/50V
Q76 5551
Q75 5551
R158
1k5
R1711k5
-15
Q85 5401
D2D LEDB
R142 20k
R156 390k
C77
10u/35V
-15
314
S6C SWAB
215
S6B SWAB
116
S6A SWAB
M-
FBKB
LIMB
ERRORB
3 2
1
84
U12A LM393
R185 12k
+15
R174 4k7
R193 1k5
D2B LEDB GB
R204 10k
D29 1N4148
C74 100n/100V
GB
5 6
7
U12B LM393
R162 10k
R176 4k7
R146 47k R129 15k
Gadap
ERRORB
R209300k OUTB
TEMP_INB
R215 3k3
C98 10u/16V
R154 470k R207 75k GB
-15
Q81 5401
R183 1k5
C89 10u/16V
GB
D2A LEDB
GB
R136 15k
GB
+15U3 -15U3
+15U4 -15U4
+15
R220 100R C111
47u/16V
-15
R169 100R
C94 47u/16V
GB
+15U3 -15U3
+15
R226 100R C103
47u/16V
-15
R170 100R
C91 47u/16V
GB
+15U4 -15U4
C93 10u/35V C73 10u/35V
GB GB
+15
-15
R179 10k
Q77 5551
-15
R163 10k
+15
SIGNAL_INB
Q86 5551
R186 47k
-15
+15
R144 2k7
GB
R161 82k5
512
S6E SWAB
413
S6D SWAB
GsB
R225 1k5
BRIDGEA
VOUT_B IOUT_B TEMPA_B CLIP_B SIGNAL_B TEMP_B
INB- INB+
Gadap
CLIP_INB TEMP_INB TEMP_AINB
IOUT+B IOUT-B
OUTB
1 2 3
J16 Adap t In 4
1 2 3
J15 Adap t In 1
1 2 3
J8 Adap t In 3
1 2
J11 Adap t In 2
SIGNAL_INB
Gadap Gadap
Gadap
t
RT3 NTC 10k
G1B
R175 1M
MB
RMSLim
LIMB
D2C LEDC
M+
D26 1N4148
R145 20k
GB
Q79 5551
GB
R151 47k
R195 10k
Q88 5401
R177 100k
+15
R212 3k92
-15
R22939k
D46
1N4148
R194 1M
-15
D37 1N4148
Q89 MPSA13
+15
D45 1N4148
R211 100k
-15
D38
1N4148
Q83 MPSA13
+15
R218 2k7
D39 1N4148
D44 1N4148
LIMB MSB
MB
GsB
MSB
+15
LIMB
CLIP_INB
R210 100R R203 475R
R22347k Q90
5401
Q91 MPSA13
R228 100k
GB
R227 680R
GB
+15
D43 1N4148
C92 100p/50V
C78 100u/16V
14 15 13
9
12
16
10
U8B LM13700M
T1B
T2B
T3B
T4B
T5B
T6B
T7B T8B
T9B
T10B
T11B
T12B
T14B
T16B
T18B
T19B
T20B
T21B T22B
T24B
T27B
T28B
T29B
R149 4k7
GB
Q87 SST111
R150 20k
R217 3k3
+15
C66 nc C71
nc C113
nc
R205 47k
LIMB2
LIMB2
-15 +15
C107 470n/50V RAM Audio - S
S3004 - S4004- S4044 Channel B Schematic
Sheet 3 of 8DWG No: Channel B.Sch
DRAWN DESIGN REPLACE REPL. BY
Q34
IRFI1310N
Q192 5551
Q189
5551
Q190 5551
Q188 5401
R553 15k
R546 47R
R533 7k5
R547 3k92
R532 10k
R540 10k
R539 47k
R541 47k
R534 47k
R531 10k
D191 12V
D182 15V
D181 12V
D171
1N4148
D168 1N4148
D163
1N4148
D175
1N4148
D174 1N4148
C243
22u/16V
C238 27p/100V
C240 1n/100V
Q194
5401
R538 NC
R565 1R/1W
D194 FFPF30U60S
C250
100n/100V
OUTB
C237100p/100V
-V2BD
-V1BD
Q41
IRFI1310N
R590 15k
R583 47R
R582 10k
R573 3k92
R575 2k
R589 10k
R599 47k
R591 47k
R601 100k
R598 47k
R597
10k
Q210 5551
Q206
5551
Q214
5551
Q207
5401
Q208
5401
D199 15V
D218 12V
D209
1N4148
D1971N4148 D208
1N4148
D198
1N4148
D215
1N4148
D206 1N4148
D214
1N4148
C25222u/16V
C262 27p/100V
C259 1n/100V
+V2BD
+V1BD
R602 1R/1W
D216 FFPF30U60S C265 100n/100V
+V2BD
OUTB
C257
100p/100V
Q213 PZT2222A
Q195 PZT2907A
R594 75R R570 75R
R600 4R7/1W
R592 22R/1W
C266
470p/50V
C258
470p/50V
C261
33n/100V
R585
220R
R577 10R/1W
D220 1N4148
D213 1N4148
D217
MURS160T3
R548 220R
R544 10R/1W
D192 MURS160T3
D193 1N4148
D187
1N4148
C260
100p/50V
R578 100R
C251 100n/100V
R554 100R
C241
100n/100V
G1B
-15
Q35
MJF15031
R387475R

12345678
A B C D
8
7654321
D
C B A
R267 10k
R268 10k
R281 10k
R25610k
C142 100p/50V
C127100p/50V
GsC
C116
10u/50V
C115
10u/50V
R3 10k
GsC
R234 47k
GsC
+15
G1C
R479 150k
R459 330R
R456 1k8 R455 100k
R454 15k
R12 0R33/4W
R11
0R33/4W
C219
10u/35V
D118 BAS85
D120
MURS160T3
Q156 5551
Q155 5401
Q19 MJE15033
Q15
MJW21195
Q16
MJW21195
G1C
R520 39k R516 2k
R494 330R
R495 1k8 R14
0R33/4W
R15
0R33/4W
R493 100k
R492 15k
C231
10u/35V
D151 MURS160T3
Q170 5401
Q23 MJE15032
Q24
MJW21196
Q26
MJW21196
Q169 5551
D145
BAS85
3 2
1
8 4
U21A 5532
C174 47u/16V
G1C
D135
1N4148
R378 3k01
R396 12k
RV1
500R
R379 20k
+15
R403 620R
D84 1N4148 D78 1N4148
R384 20k
-15
Q162 MMBTA42 Q182 MMBTA92
R503 12k
M+
Q18
MJF15030
G1C
+15
R480 2k R470 39k
C221
2n2/100V
Q158 5401
R13 0R33/4W
Q17
MJW21195
R519 150k
G1C
C236
2n2/100V
Q172 5551
R16 0R33/4W
Q25
MJW21196
1 2
J30 IN.C
C125 100n/100V
C123 220n/50V
C126
100n/100V
5 6
7
U21B 5532
R241 47k
GsC
R2801k5
R279475R
GsC
R2611k5
C129470p/50V
R247 15k
NTC Sense
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16
J21 Adap t Out
+15 -15 G15
OUTC
OUTC
IOUT+C
IOUT-C
TEMP_AINC
S5B GCD
R278NC
26dB
32dB
38dB
R230 20k C130
100p/50V
GsC
3 2
1
84
U18A 5532
R262 4k7
GsC
R269
1k5
C136 100u/16V
R263 1k
C140
470p/50V
R288 12k
R273100R
GC
3 2 4
8 5
1
7
116
U20A LM13700M
R272 100R
GC
R271 39k
+15
R249 15k
C12410p/100V
5 6
7
U18B 5532
R235 15k
GsC
C13522p/50V
R299 3k3
+15
Q100 5551 Q95 5401
R250 7k5 R244 1k
GC
C137 470p/50V
Q93 5551
Q92 5551
R236
1k5
R2431k5
-15
Q98 5401
+15
D3D LEDC
R287 20k
R270 390k
C132
10u/35V
-15
8 9
S7H SWCD
710
S7G SWCD
611
S7F
SWCD
M-
FBKC
LIMC
LIMC
ERRORC
3 2
1
84
U19A LM393
R257 10k
+15
R251 4k7
R275 1k5
D3B LEDC GC
R274 10k
D48 1N4148
C122 100n/100V
GC
5 6
7
U19B LM393
R246 2k
R253 4k7
RMSLim
LIMC
D3C LEDC
R131 47k R130 15k
Gadap
ERRORC
R242300k OUTC
TEMP_INC
R286 3k3
C138 10u/16V
R240 470k R277 75k GC
-15
Q99 5401
R255 1k5
C12810u/16V
GC
D3A LEDC
GC
R232 3k3
GC
+15U5 -15U5
+15U6 -15U6
+15
R294 100R C143
47u/16V
-15
R248 100R
C134 47u/16V
GC
+15U5 -15U5
+15
R282 100R C131
47u/16V
-15
R231 100R
C117 47u/16V
GC
+15U6 -15U6
C133 10u/35V C12010u/35V
GC GC
+15
-15
R180 10k
Q78 5551
-15
R164 10k
+15
SIGNAL_INC
Q102 5551
R258 47k
-15
+15
R237 3k3
GC
R245 82k5
+15
BRIDGEC
CLIP_INC
VOUT_C IOUT_C TEMPA_C CLIP_C SIGNAL_C TEMP_C
INC- INC+
+15
R298 100R C139
47u/16V
-15
R297 100R
C148 47u/16V
GD
+15OTA2 -15OTA2
+15OTA2
-15OTA2
Gadap
CLIP_INC TEMP_INC TEMP_AINC
IOUT+C IOUT-C
OUTC
1 2 3
J18 Adap t In 4
1 2 3
J17 Adap t In 1
1 2 3
J9 Adap t In 3
1 2
J12 Adap t In 2
SIGNAL_INC
Gadap Gadap
Gadap
t
RT2 NTC 10k
G1C
M+
D47 1N4148
R238 20k
GC
Q96 5551
GC
R239 47k
R266 10k
Q103 5401
R259 100k
+15
R293 3k92
-15
R30239k
D55
1N4148
R252 1M
R265 1M
-15
D49 1N4148
Q106 MPSA13
+15
D54 1N4148
R292 100k
-15
D50
1N4148
Q101 MPSA13
+15
R291 2k7
D51 1N4148
GsC
D53 1N4148
R290 100R R264 475R
R28947k Q104
5401
Q105 MPSA13
R296 100k
GC
R295 680R
GC
+15
LIMC MSC
MC
MC
MSC
D52 1N4148
C119 100p/50V
C121 100u/16V
T1C
T2C
T3C
T4C
T5C
T6C
T7C T8C
T9C
T10C
T11C
T12C
T14C
T16C
T18C
T19C
T20C
T21C T22C
T24C
T27C
T28C
R233 4k7
GC
B
C E
Q94 SST111
+15
R283 3k3
C114 nc
C118
nc
C141 nc
R284 47k
LIMC2
-15
LIMC2
C144 470n/50V RAM Audio - S
S3004 - S4004- S4044 Channel C Schematic
Sheet 4 of 8DWG No: Channel C.Sch
DRAWN DESIGN REPLACE REPL. BY
Q21
IRFI1310N
R483 15k
R472 47R
R477 10k
R465 3k92
R478 2k
R482 10k
R490 47k
R484 47k
R487 100k
R489 47k
R488
10k
Q166 5551
Q160
5551
Q165
5551
Q157
5401
Q161
5401
D131 15V
D141 12V
D140
1N4148
D1381N4148 D139
1N4148
D130
1N4148
D142
1N4148
D137 1N4148
D143
1N4148
C21422u/16V
C222 27p/100V
C220 1n/100V
+V2AC
+V1AC
R453 1R/1W
D119 FFPF30U60S
C208 100n/100V
+V2AC
OUTC
C217
100p/100V
Q28
IRFI1310N
Q183 5551
Q176
5551
Q179 5551
Q178 5401
R527 15k
R510 47R
R515 7k5
R525 3k92
R514 10k
R523 10k
R522 47k
R524 47k
R517 47k
R513 10k
D162 12V
D167 15V
D166 12V
D161
1N4148
D154 1N4148
D153 1N4148 D165 1N4148
D164 1N4148
C239
22u/16V
C230 27p/100V
C232 1n/100V
Q184
5401
R518 NC
-V1AC
R491 1R/1W
D144 FFPF30U60S
C223
100n/100V
OUTC
C235100p/100V
-V2AC
Q153 PZT2222A
Q168 PZT2907A
R461 75R R486 75R
R467 4R7/1W
R473 22R/1W
C210
470p/50V
C215
470p/50V
C216
33n/100V
R481
220R
R485 10R/1W
D122 1N4148
D136 1N4148
D127
MURS160T3
R512 220R
R521 10R/1W
D152 MURS160T3
D150 1N4148
D155
1N4148
C209
100p/50V
R474 100R
C224 100n/100V
R498 100R
C233
100n/100V
G1C
-15
Q22
MJF15031
R389475R

12345678
A B C D
8
7654321
D
C B A
R338 10k
R339 10k
R348 10k
R32710k
C173 100p/50V
C157100p/50V
GsD
C146 10u/50V
C147
10u/50V
R4 10k
GsD
R333 47k
GsD
G1D
R607 150k
R641 330R
R643 1k8 R642 100k
R644 15k
R25 0R33/4W
R23
0R33/4W
C280
10u/35V
D247 BAS85
D242
MURS160T3
Q232 5551
Q231 5401
Q46 MJE15033
Q43
MJW21195
Q44
MJW21195
G1D
R647 39k R653 2k
R678 330R
R677
1k8 R26
0R33/4W
R28
0R33/4W
R679 100k
R680 15k
C292
10u/35V
D258
MURS160T3
Q248 5401
Q50 MJE15032
Q51
MJW21196
Q53
MJW21196
Q245 5551
D270
BAS85
3 2
1
8 4
U23A 5532
C299 47u/16V
G1D
D229
1N4148
R687 3k01
R682 12k
RV3 500R
R686 20k
R681 620R
D272 1N4148 D271 1N4148
R685 20k
-15
Q219 MMBTA42 Q233 MMBTA92
R645 12k
M+
Q49
MJF15030
G1D
R617 2k R628 39k
C278
2n2/100V
Q229 5401
R24 0R33/4W
Q45
MJW21195
R670 150k
G1D
C293
2n2/100V
Q243 5551
R27 0R33/4W
Q52
MJW21196
1 2
J32 IN.D
C155 100n/100V
C153 220n/50V
C156
100n/100V
5 6
7
U23B 5532
R310 47k
GsD
R353NC
R3471k5
GsD
R3321k5
C159
470p/50V
R318 15k
NTC Sense
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16
J22 Adap t Out
-15 G15
OUTD
OUTD
IOUT-D
TEMP_AIND
S5A GCD
R346475R
26dB
32dB
38dB
C168 100p/50V
GsD
3 2
1
84
U24A 5532
R360 4k7
GsD
R367 1k5 C171
100u/16V
R361 1k
C179
470p/50V
R300 12k
R315100R
GD
14 15 13
9
12
16
10
U20B LM13700M
R314 100R
GD
R312 39k
R340 15k
C170 10p/100V
5 6
7
U24B 5532
R334 15k
GsD
C16522p/50V
R370 3k3
Q112 5551 Q110 5401
R328 7k5 R322 1k
GD
C166 470p/50V
Q108 5551
Q107 5551
R313
1k5
R3211k5
-15
Q113 5401
D4D LEDD
R305 20k
R311 390k
C150
10u/35V
-15
314
S7C SWCD
215
S7B SWCD
116
S7A SWCD
M-
FBKD
LIMD
ERRORD
3 2
1
84
U22A LM393
R329 12k
R323 4k7
R343 1k5
D4B LEDD GD
R342 10k
D57 1N4148
C152 100n/100V
GD
5 6
7
U22B LM393
R317 10k
R325 4k7
R276 47k R285 15k
Gadap
ERRORD
R354300k OUTD
TEMP_IND
R352 3k3
C164
10u/16V
R309 470k R345 75k GD
-15
Q111 5401
R326 1k5
C15810u/16V
GD
D4A LEDD
GD
R301 15k
GD
+15U7 -15U7
+15U8 -15U8
R359 100R C172
47u/16V
-15
R319 100R
C163 47u/16V
GD
+15U7 -15U7
R377 100R C169
47u/16V
-15
R320 100R
C160 47u/16V
GD
+15U8 -15U8
C162 10u/35V C151 10u/35V
GD GD
-15
R260 10k
Q97 5551
-15
R254 10k
SIGNAL_IND
Q116 5551
R330 47k
-15
R306 2k7
GD
R316 82k5
512
S7E SWCD
413
S7D SWCD
GsD
R366 1k5
BRIDGEC
VOUT_D IOUT_D TEMPA_D CLIP_D SIGNAL_D TEMP_D
IND- IND+
+15
+15
+15
+15 +15
+15 +15
+15 +15
+15
+15
+15
+15
Gadap
CLIP_IND TEMP_IND TEMP_AIND
IOUT-D
OUTD
1 2 3
J26 Adap t In 4
1 2 3
J27 Adap t In 1
1 2 3
J33 Adap t In 3
1 2
J31 Adap t In 2
SIGNAL_IND
Gadap Gadap
Gadap
t
RT4 NTC 10k
G1D
R324 1M
MD
RMSLim
LIMD
D4C LEDC
M+
D56 1N4148
R307 20k
GD
Q109 5551
GD
R308 47k
R344 10k
Q117 5401
R331 100k
+15
R357 3k92
-15
R37139k
D69
1N4148
R335 1M
-15
D60 1N4148
Q120 MPSA13
+15
D68 1N4148
R356 100k
-15
D61
1N4148
Q114 MPSA13
+15
R355 2k7
D62 1N4148
D66 1N4148
LIMD MSD
MD
GsD
MSD
+15
LIMD
CLIP_IND
R363 100R R341 475R
R36247k Q119
5401
Q121 MPSA13
R369 100k
GD
R368 1k5
GD
+15
D65 1N4148
C161 100p/50V
C154 100u/16V
T1D
T2D
T3D
T4D
T5D
T6D
T7D T8D
T9D
T10D
T11D
T12D
T14D
T16D
T18D T20D
T21D T22D
T24D
T27D
T28D
T29D
T27D
R303 4k7
GD
Q118 SST111
R304 20k
R349
3k3
+15
C145 nc
C149
nc
C175nc
R350 47k
LIMD2
-15
LIMD2
C178 470n/50V
RAM Audio - S S3004 - S4004- S4044 Channel D Schematic
Sheet 5 of 8DWG No: Channel D.Sch
DRAWN DESIGN REPLACE REPL. BY
Q48
IRFI1310N
R640
1R/1W
D243 FFPF30U60S
C283 100n/100V
Q55
IRFI1310N
R673 1R/1W
C291
100n/100V
D259 FFPF30U60S
R626 15k
R614 47R
R616 10k
R609 3k92
R613 2k
R625 10k
R637 47k
R627 47k
R639 100k
R636 47k
R635
10k
Q225 5551
Q223
5551
Q228
5551
Q221
5401
Q220
5401
D223 15V
D244 12V
D236
1N4148
D2271N4148 D235
1N4148
D228
1N4148
D241
1N4148
D234 1N4148
D240
1N4148
C27022u/16V
C277 27p/100V
C274 1n/100V
+V2BD
+V1BD
+V2BD
OUTD
C273
100p/100V
Q238 5551
Q236
5551
Q235 5551
Q234 5401
R668 15k
R646 47R
R651 7k5
R667 3k92
R658 10k
R661 10k
R657 47k
R660 47k
R655 47k
R650 10k
D254 12V
D266 15V
D265 12V
D251
1N4148
D250 1N4148
D249 1N4148
D252 1N4148
D253 1N4148
C296
22u/16V
C284 27p/100V
C285 1n/100V
Q242
5401
-V1BD
C286 100p/100V
OUTD
-V2BD
Q227 PZT2222A
Q239 PZT2907A
R632 75R R610 75R
R638 4R7/1W
R631 22R/1W
C281
470p/50V
C275
470p/50V
C276
33n/100V
R618
220R
R615 10R/1W
D246 1N4148
D238 1N4148
D245
MURS160T3
R659 220R
R648 10R/1W
D268 MURS160T3
D269 1N4148
D267
1N4148
C297
100p/50V
R619 100R
C268 100n/100V
R671 100R
C287
100n/100V
G1D
-15
Q56
MJF15031
R390475R

1 2 3 4 5 6 78
A B C D
8
7654321
D
C B A
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20
J23 EtheRAM IN
GsA
GsB
GsC
GsD
G15 +15
-15
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
J29 EtheRAM Signals
LSTBY
1 2 3 4 5 6 7 8 9
J34 Cinta
FBKA FBKB FBKC FBKD
+15
-15
+5
G5
1 2 3 4
J37 Cinta
DCS
R529 10k
Q181 5551 Q187 5401
G
R528 47k
Q180 5551
R536 1k
+RM
M+M-
Q186 5401
R530 1k
R526 47k
-RM
R713 47k
Q251 5401
G
C305
33u/16V
G
R709 1M
R712 47k
R704 300k
D284 5V1
Q253 5401
G
+15
RMSLim
R375 33k
R66933k
R376 33k
R674 33k
OUTA
OUTB
OUTC OUTD
R695 100k
G
C298 100u/10V
G
D279 1N4148
D277
1N4148
R705 10k
R710 20k
R697 150k
5 6
7
U25B LM393
G
C309 1n/100V
R711 10k
G+15
R696 1k5
DCS
1
2
3
4
J1 D XLR F
1
2
3
4
J2 C XLR F
1
2
3
4
J3 B XLR F
1
2
3
4
J4 A XLR F
S1 PARAL
1
2
3
4
5
6
7
8
J5 CON8
S2 PARAL
S3 PARAL
D5A STBY+ON
VOUT_A
IOUT_A
TEMPA_A
CLIP_A
SIGNAL_A
TEMP_A VOUT_B
IOUT_B
TEMPA_B VOUT_C
IOUT_C
TEMPA_C
VOUT_D IOUT_D TEMPA_D CLIP_B SIGNAL_B TEMP_B
CLIP_C
SIGNAL_C TEMP_C CLIP_D
SIGNAL_D
TEMP_D
R701 330R G
R700 3k92
D5D STBY+ON
G
INA+INA-
INB+
INB-
INC+
IND-
INC-
IND+
1
2
J6 FASTON
+15
C301 100u/10V
R694 100k
D176 1N4148
D282 1N4148
G5
+5
15AC
15AC
D275 1N4148 G D172 1N4148 G
C4
10u/100V
+V2AC +V1AC -V2AC-V1AC
R715 1k
C311
470n/50V
-15
VRAIL_A
1
2
J25 FASTON
GG1A G1B G1C G1D GsA GsB GsC GsD GA GB GC GD GADAP G15
T32
T33
T34
T36
T37
+V1BD
-V1BD
+V1AC
-V1AC
D169 1N4148 D173 1N4148
D170 1N4148 D178 1N4148
+RM -RM
T38
R703 47k
T13
D283 1N4148
C302
470n/50V
RAM Audio - S Series S3004 - S4004- S4044 Inputs, protections & fans
Sheet 6 of 8DWG No: Comun.Sch
DRAWN DESIGN REPLACE REPL. BY
C5
10u/100V
C7
10u/100V
C6
10u/100V
+5
G5
C9
10u/100V
+V2BD +V1BD -V2BD-V1BD
C11
10u/100V
C12
10u/100V
C13
10u/100V
R537 100k
R692 100k
G
C304 100u/10V
G
C307 100u/10V
R693 100k
D280 1N4148
D276
1N4148
C312
-
T15
R716 10k
G
G5
1 2 3 4 5 6
J35 JST
+V2AC
-V2AC -V1AC
+V1AC
OUTC
OUTA
1 2 3 4 5 6
J36 JST
+V2BD +V1BD
-V1BD -V2BD
OUTD
OUTB
R336 7k5
R358 14k
-15
R351 100k
D59 5V1 D58 12V
3 2
1
8 4
U25A LM393
R365 100R
G
C3 100n/100V R364
1k
R372 2k
Q6 5401
R38010R C14
47u/16V
R337 4k7
R374 100k
R373
7k5
R385 4R7
+15
Q12
MJD350
L3 100uH
C15
10u/35V
L5 100uH
1 2
J38
24V DC FAN1
L2 100uH
C16
10u/35V
L4 100uH
-15
1 2
J39
24V DC FAN2
C306 47u/16V
C308
47u/16V
G G
-15
+15 Q20
MJD350
R386 4R7
T31
NTC Sense Q249
5401
R698 1k
+15
G
T30
R690 100k
C303 1n/100V
C8
10u/100V
C182 10u/100V
C10
10u/100V
C183
10u/100V

1 2 3 4 5 6 78
A B C D
8
7654321
D
C B A
TRIG
2
Q3
R
4
CVolt
5THR 6
DIS 7
VCC 8 GND
1
U9C 555 +C56C
10u/16V
R140C 150k
C58C
100n/100V
Gp
+15p
U1C TLP3062
R132C 1k5
C47C
100n/100V
GpGp
Gp
3 2
1
84
U8CA
LM393
5 6
7
U8CB
LM393
Gp
+15p
C40C
100n/100V
Gp
R131C 1k5
R40C 1M R35C 470k R66C 20k
R108C 1M
R126C
470k
R107C 15k
R145C 1k5 R139C 2k
C1C
100n/400V
Gp
D37C 1N4148
+5p
GpGpGp
+5p
Vac
+V
C23C
4.7uF/16V
Gp
C41C 100n/100V
Gp
TR1
TR
R36C 75R
Tb Ta
CIN
11
COUT
9
COUT
10
RST
12
Q4 7
Q5 5
Q6 4
Q7 6
Q8 14
Q9 13
Q10 15
Q12 1
Q13 2
Q14 3
VCC
16 GND 8
U13C 4060
Y1C 4 MHz
R210C 1k
R204C 10M
C72C 47p/50V
C76C 47p/50V
C68C
100n/100V
Gp
GpGp
Gp
Gp
LO
1
COM 2
VCC
3
NC
4Vs 6
Vb 7
HO
8
NC
10
VDD
11
HIN 12
SD 13
LIN 14
VSS 15
NC
16 NC
9NC 5
U12C
IR2110S
IN+ 2
IN- 1
OSC SYNC 3
SD 10
VIN+ 15
OSC OUT
4
OUTA
11
OUTB
14
VREF
16 DISC
7COMPN 9CT 5
RT 6
SOFTSTART 8
VC
13 GND 12
U15C
SG3525AP
+5p
Gp
R159C 1k
R173C 2k D38C
1N4148
C62C
470p/50V
Gp
+15p
+
C69C 1u/16V
Gp
D40C 5V1
R141C 2k
Gp SD
R189C
7k5
R188C 100R
C77C 1n/100V
C81C
100n/100V
Gp
+5p
+15p
SD
C82C 220n/50V D44C MURS160T3
+15p
VS
Gp
R197C
10R
D45C
1N4148
R205C
10R
D46C
1N4148
LO
HI
COM
+15p
C78C 100n/100V
Gp
C73C
100n/100V
COM
SD
3 2
1
84
U2CA LM393
5 6
7
U2CB LM393
R76C 100k
R77C 10k
R32C 10k R34C 100k
+C32C
10u/16V
+C7C
10u/16V
R33C 820R
R68C 220k
-15c
+15c
Vm Vc
+15c
C4C 470n/50V C8C 470n/50V
+C17C
10u/16V
+C3C
10u/16V
R46C 100k R47C 100k
D19C 15V D16C 15V
Q57C MJD340
Q49C MJD350
+15c Vm -15c +V Gp
R57C 470k R29C 220k
R67C 4k7 R56C 47k
R75C 10k
D22C MURS160T3
Q51C MPSA13
Q61C 5401
+
C15C 47u/16V
Vc
Vm
LIMIT
R78C 2k7
Gp
TR
+15c
S
2D5
M1
NC 6
C4
S
3
S
7
S
8
U7C TOP242G
C2C 100n/400V
C24C 100n/100V
+C44C
47u/16V
D28C 9V1
R69C 1M
R109C 22R
R158C 680R
L1C 3m32
D26C MURS160T3
D34C MURS160T3 +C53C
47u/16V
Gp
Gp +V
+15p
D39C LED
Gp
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
JP1C HEADER 15X2
Gp
TR1
LIMIT
-15c
Tb
Ta Vac +V Vc Vm HI Vs LO COM
D35C
MURS160T3
VS
D20C
MURS160T3
R130C 3k01
R87C 390k
R88C 1k
R125C
10M
+15p
R48C 75R
R70C 1M
U10C HCPL0453
+15p
D15C 1N4148
R133C100k
D23C
MURS160T3
Vac
+V
Rl
Rl
R146C 10k
Gp
D206C
1N4148
TR1
C264C 10u
D207C
1N4148
TR1
R700C 3k32
+15p
C265C
470n/50V
R705C 1k
R180C 10k
D208C 1N4148
D18C 1N4148
C266C
10p/100V
R613C 15k
1A 2K
3
C
4
EU25C
TLP181
Gp
R614C 2k SD
Q203C 5401
D209C1N4148 D210C1N4148
R612C
47k
Q204C 5551
R319C 47k
-15c
C268C 100p/50V
RAM Audio - S Series S3004 - S4004 - S4044 Power Supply Control Schematic
Sheet 7 of 8DWG No: Control S.Sch
DRAWN DESIGN REPLACE REPL. BY

1 2 3 4 5 6 78
A B C D
8
7654321
D
C B A
FBKB OUTB M+ M-
RMSLIM
NTC SenseBRIDGEA
VOUT_B IOUT_B TEMPA_B
CLIP_B
TEMP_B
VINSW_B
INB+ INB-
VINPOS_B
Channel B Channel B.Sch
FBKA FBKB
OUTA
OUTB
M+ M-
RMSLIM
NTC Sense
TEMPA_A
CLIP_A
VINSW_A
VOUT_B IOUT_B TEMPA_B
CLIP_B
IOUT_A
TEMP_B
VOUT_A
VINSW_B
TEMP_A
INA+ INA- INB+ INB-
VRAIL_A
VINPOS_B
VINPOS_A
Comun Comun.Sch
FBKA OUTA M+ M-
RMSLIM
NTC SenseBRIDGEA
VOUT_A IOUT_A TEMPA_A
CLIP_A
TEMP_A
VINSW_A
INA+ INA-
VRAIL_A
VINPOS_A
Channel A Channel A.Sch
Control_S Control_S.Sch
RAM Audio - S Series S1500 - S2000 - S3000 - S4000 Signals Block Diagram
Sheet 1 of 5DWG No.
DRAWN DESIGN REPLACE REPL. BY

12345678
A B C D
8
7654321
D
C B A
R130 10k
R131 10k
R141 10k
R11710k
C73 100p/50V
C58 100p/50V
GsB
C49 10u/50V
C47
10u/50V
R2 10k
GsB
R125 47k
GsB
+15
G1B
R18
0R33/4W
R190R33/4W
D96MURS160T3
Q25 MJE15033
Q26
MJW21195
Q27
MJW21195
R22
0R33/4W
R21
0R33/4W
D126 MURS160T3
Q34
MJE15032
Q31 MJW21196
Q33 MJW21196
3 2
1
8 4
U6A 5532
C140 47u/16V
G1B
R330 3k01
R326 12k
RV2
500R
R329 20k
+15
R325 620R
D128 1N4148 D129 1N4148
R328 20k
-15
M+
R267 2k R272 39k
C118
2n2/100V
Q114 5401
R20
0R33/4W
Q28
MJW21195
R230R33/4W Q32 MJW21196
1 2
J17 IN.B
C56 100n/100V
C54 220n/50V
C57
100n/100V
5 6
7
U6B 5532
R101 47k
GsB
R145475R
R1401k5
GsB
R1241k5
C59
470p/50V
R105 15k
NTC Sense
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16
J8 Adap t Out
+15 -15 G15
OUTB
OUTB
IOUT+B
IOUT-B
TEMP_AINB
S2A GAB
R139NC
26dB
32dB
38dB
C68
100p/50V
GsB
3 2
1
84
U7A 5532
R153 4k7
GsB
R157
1k5
C71 100u/16V
R154 1k
C76
470p/50V
R97 12k
R109100R
GB
R110 100R
GB
R108 39k
+15
R13215k C70 10p/100V
5 6
7
U7B 5532
R126 15k
GsB
C65 22p/50V
R160 3k3
+15
Q62 5551 Q57 5401
R118 7k5 R112 1k
GB
C66 470p/50V
Q56 5551
Q55 5551
R103
1k5
R1111k5
-15
Q60 5401
D2D LEDB
R96 20k
R107 390k
C51
10u/35V
-15
314
S3C SWAB
215
S3B SWAB
116
S3A SWAB
M-
FBKB
LIMB
ERRORB
3 2
1
84
U5A LM393
R127 10k
+15
R119 4k7
R135 1k5
D2B LEDB GB
R134 10k
D22 1N4148
C53 100n/100V
GB
5 6
7
U5B LM393
R114 2k
R121 4k7
R143 47k R129 15k
Gadap
ERRORB
R146300k OUTB
TEMP_INB
R152 3k3
C67 10u/16V
R100 470k R144 75k GB
-15
Q59 5401
R115 1k5
C63 10u/16V
GB
D2A LEDB
GB
R93 3k3
GB
+15U3 -15U3
+15U4 -15U4
+15
R156 100R C72
47u/16V
-15
R116 100R
C62 47u/16V
GB
+15U3 -15U3
+15
R162 100R C69
47u/16V
-15
R106 100R
C60 47u/16V
GB
+15U4 -15U4
C64 10u/35V C52 10u/35V
GB GB
+15
-15
Q63 5551
R120 47k
-15
+15
R98 3k3
GB
R113 82k5
512
S3E SWAB
413
S3D SWAB
GsB
R161 1k5
BRIDGEA
VOUT_B IOUT_B TEMPA_B CLIP_B
TEMP_B
INB- INB+
Gadap
CLIP_INB TEMP_INB TEMP_AINB
IOUT+B IOUT-B
OUTB
1 2 3
J15 Adap t In 4
1 2 3
J16 Adap t In 1
1 2 3
J21 Adap t In 3
1 2
J19 Adap t In 2
t
RT2 NTC 10k
G1B
R122 1M
MB
RMSLim
LIMB
D2C LEDC
M+
D21 1N4148
R99 20k
GB
Q58 5551
GB
R104 47k
R136 10k
Q65 5401
R123 100k
+15
R150 3k92
-15
R16339k
R128 1M
-15
D23 1N4148
Q67 MPSA13
+15
D28 1N4148
R151 100k
-15
D25
1N4148
Q61 MPSA13
+15
R149 2k7
D24 1N4148
MSB
MB
GsB
MSB
+15
LIMB
CLIP_INB
R148 100R R133 475R
R15547k Q66
5401
Q68 MPSA13
R159 100k
GB
R158 680R
GB
+15
D26 1N4148
C61 100p/50V
C55 100u/16V
14 15 13
9
12
16
10
U4B LM13700M
T1B
T2B
T3B
T4B
T5B
T6B
T7B T8B
T9B
T10B
T11B
T12B
T14B
T16B
T18B
T27B
T28B
T29
R95 4k7
GB
Q64
SST111
R102 20k
R147 3k3
+15
C46 NC
C50 NC
C74 NC
R142 47k
LIMB2
LIMB2
-15 +15
Gadap
VinswB
VinposB
VINSW_B VINPOS_B
VinswB
VinposB
R262 150k
R283 330R
R284 1k8 R285 100k
R287 15k
C120
10u/35V
D106 BAS85
Q118
5551
Q117 5401
G1B
R295 39k R296 2k
R309 330R
R308
1k8
R310 100k
R311 15k
C130
10u/35V
Q129 5401
Q127 5551
D118
BAS85
D94
1N4148
Q109 MMBTA42 Q119 MMBTA92
R288 12k
R305 150k
G1B
C129
2n2/100V
Q126 5551
T19B
T20B
T21C T22B
T24B
R15
0R33/4W
Q21
MJW21195
R160R33/4W
Q22
MJW21195 R170R33/4W
Q23
MJW21195
R24
0R33/4W Q37 MJW21196
R25
0R33/4W Q38 MJW21196
R26
0R33/4W Q39 MJW21196
Gadap
C75 470n/50V RAM Audio - S
S1500 - S2000 - S3000 - S4000 Channel B Schematic
Sheet 3 of 5DWG No: Channel B.Sch
DRAWN DESIGN REPLACE REPL. BY
Q30
MJF15030
G1B
Q36
MJF15031
+15
Q112 PZT2222A
Q125 PZT2907A
R276 75R R263 75R
R277 4R7/1W
R273 22R/1W
C121
470p/50V
C116
470p/50V
C117
33n/100V
R268
220R
R265 10R/1W
D105 1N4148
D97 1N4148
D103
MURS160T3
R299 220R
R289 10R/1W
D116 MURS160T3
D117 1N4148
D115
1N4148
C132
100p/50V
R266 100R
C113 100n/100V
R304 100R
C124
100n/100V
G1B
-15
Q35
IRFI1310N
Q124 5551
Q122
5551
Q123
5551
Q121 5401
R300 15k
R292 47R
R297 7k5
R291 3k92
R303 10k
R294 10k
R298 47k
R293 47k
R301 47k
R302 10k
D112 12V
D108 15V
D111 12V
D109
1N4148
D110 1N4148
D107
1N4148
D114
1N4148
D113 1N4148
C127
22u/16V
C131 27p/100V
C126 1n/100V
Q120
5401
R290 NC
R307 1R/1W
D9 FFPF30U60S
C128
100n/100V
OUTB
C125100p/100V
-V2B
-V1B
Q29
IRFI1310N
R264 15k
R280 47R
R279 10k
R282 3k92
R278 2k
R281 10k
R270
47k
R271 47k
R274 100k
R269
47k
R275 10k
Q110
5551
Q113
5551
Q115
5551
Q116 5401
Q111
5401
D101 15V
D92 12V
D93
1N4148
D1001N4148 D104
1N4148
D95
1N4148
D98
1N4148
D102 1N4148
D99
1N4148
C122
22u/16V
C114 27p/100V
C119 1n/100V
+V2B
+V1B
R286 1R/1W
D8 FFPF30U60S
C123
100n/100V
C115
100p/100V
R354 475R
+V2B
R171
2k7

1 2 3 4 5 6 78
A B C D
8
7654321
D
C B A
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
J9 EtheRAM Signals
LSTBY
1 2 3 4 5 6 7 8 9
J22 Cinta
FBKA FBKB
+15
-15
+5
G5
1 2 3 4
J25 Cinta
DCS
R247 10k Q101
5551 Q103 5401
G
R245 47k
Q100 5551
R249 1k
+RM
Q102 5401
R248 1k
R244 47k
-RM
R351 47k
Q137 5401
G
C143
33u/16V
G
R346 1M
R350 47k
R341 300k
D138 5V1
Q139 5401
G
+15
RMSLim
1
2
3
4
J1 B XLR M
1
2
3
4
J2 B XLR F
1
2
3
4
J3 A XLR M
1
2
3
4
J4 A XLR F
1
2
3
4
J5 CON8
S1 PARAL
D11A STBY+ON
VOUT_A IOUT_A
TEMPA_A
CLIP_A
TEMP_A
VOUT_B IOUT_B
TEMPA_B
CLIP_B
R338 330R G
R337 3k92
D11D STBY+ON
G
1
2
J6 FASTON
+15
D77 1N4148
D135 1N4148 15AC
15AC
D130 1N4148 G D80 1N4148 G
R352 1k
C148
470n/50V
-15
VRAIL_A
1
2
J12 FASTON
GG1A G1B G1C G1D GsA GsB GsC GsD GA GB GC GD GADAP G15
T32
T33
T34
T35
+V1B
-V1B
+V1A
-V1A
D78 1N4148 D81 1N4148
D79 1N4148 D85 1N4148
+RM -RM
T38
R340 47k
T13
VINSW_A
VINPOS_A
VRAIL_A
VINSW_B
VINPOS_B
Gadap Gadap
Gadap Gadap Gadap
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20
J10 EtheRAM IN
GsA
GsB
G15 +15
-15
INA+INA-
INB+
INB-
G5
+5
GsB
GsA
D136 1N4148
RAM Audio - S Series S1500 - S2000 - S3000 - S4000 Inputs, protections & fans
Sheet 4 of 5DWG No: Comun.Sch
DRAWN DESIGN REPLACE REPL. BY
C8
10u/100V
+V2B +V1B -V2B-V1B
C9
10u/100V
C12
10u/100V
C11
10u/100V
C2
10u/100V
+V2A +V1A -V2A-V1A
C3
10u/100V
C6
10u/100V
C4
10u/100V
C149
-
M+
R246 100k
M-
G5
+5
R353 10k
G
G5
TEMP_B
Gadap Gadap Gadap
1 2 3 4 5 6
J35 JST
+V2A
-V2A -V1A
+V1A
OUTA OUTA
1 2 3 4 5 6
J36 JST
+V2B +V1B
-V1B -V2B
OUTB OUTB
R375 33k
R376 33k
OUTA
OUTB R695
100k
G
C298 100u/10V
G
D279 1N4148
D277
1N4148
R705 10k
R710 20k
R697 150k
5 6
7
U25B LM393
G
C309 1n/100V
R711 10k
G+15
R696 1k5
DCS
C301 100u/10V
R694 100k
T36
T37
C302
470n/50V
R336 7k5
R358 14k
-15
R170 100k
D6 5V1 D3 12V
3 2
1
8 4
U25A LM393
R365 100R
G
C13 100n/100V R364
1k
R372 2k
Q4 5401
R38010R C14
47u/16V
R168 4k7
R374 100k
R373
7k5
R385 4R7
+15
Q24
MJD350
L3 100uH
C5
10u/35V
L5 100uH
1 2
J38
24V DC FAN1
L2 100uH
C7
10u/35V
L4 100uH
-15
1 2
J39
24V DC FAN2
C306 47u/16V
C308
47u/16V
G G
-15
+15 Q20
MJD350
R386 4R7
T31
NTC Sense Q249
5401
R698 1k
+15
G
T30
R690 100k
C303 1n/100V