Ram Audio s 500, s 2000, s 3000, s 4000, s 6000 schematic
SERVICE MANUAL
P-5343-006
QXPSDoc
1/07
© 2007 by C.E. Studio-2 s.l. - Spain (EEC)
http://www.ramaudio.com
e-mail: support@ramaudio.com
Professional Power Amplifiers
S Series
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 presence 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: +34 96 127 30 54
Fax: +34 96 127 30 56
http://www.ramaudio.com
e-mail: support@ramaudio.com
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 stereo, 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 following 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 disipation 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 mosfets in the conmutation matrix are commanded by a voltage comparator which output depends of the output signal 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 circuit 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 transformer primary winding. From the multiple secondary windings several dc voltages are built via the corresponding 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
@ 2Ω 2x 880 W 2x 1190 W 2x 1570 W 2x 1950 W 2x 2950 W 4x 700 W 4x 980 W - 4x 1440 W -
@ 4Ω 2x 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
@ 8Ω 2x 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 @ 4Ω 1760 W 2380 W 3140 W 3900 W 5900 W 2x 1400 W 2x 1960 W - 2x 2880 W -
Bridge @ 8Ω 1150 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.
@ 2Ω 2x 975 W 2x 1360 W 2x 2060 W 2x 2460 W 2x 4225 W 4x 890 W 4x 1170 W - 4x 2080 W -
@ 4Ω 2x 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 possible 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 insulated 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 insulation 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, measure 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 transistor broken.
Also, you may have only the driver transistor shorcircuited, then you can measure this direct shorcircuit between 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 output.
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.
A
1 2 3 4 5 6 78
B
C
D
IND-
IND+
Channel D Channel D.Sch
VOUT_C
IOUT_C
INC-
INC+
TEMPA_C
SIGNAL_C
NTC SenseBRIDGEC
TEMP_C
CLIP_C
VOUT_D
IOUT_D
TEMPA_D
SIGNAL_D
TEMP_D
CLIP_D
FBKD OUTDM+M-
NTC SenseBRIDGEC
RMSLIM
Channel C Channel C.Sch
VOUT_B
IOUT_B
TEMPA_B
INB+
INB-
FBKC OUTCM+M-
SIGNAL_B
RMSLIM
NTC SenseBRIDGEA
TEMP_B
CLIP_B
Channel B Channel B.Sch
FBKB OUTBM+M-
RMSLIM
INA-
INA+
VOUT_A
IOUT_A
TEMPA_A
VRAIL_A
SIGNAL_A
NTC SenseBRIDGEA
TEMP_A
CLIP_A
Control_S Control_S.Sch
Channel A Channel A.Sch
M+
TEMPA_A
VOUT_B
IOUT_B
TEMPA_B
IOUT_A
TEMPA_D
VOUT_C
IOUT_C
TEMPA_C
IOUT_D
VOUT_D
INA+
INA-
INB+
INB-
FBKA OUTAM+M-
VRAIL_A
RMSLIM
IND-
IND+
INC-
INC+
SIGNAL_C
SIGNAL_D
TEMP_D
TEMP_C
CLIP_D
CLIP_C
VOUT_A
SIGNAL_A
SIGNAL_B
TEMP_A
TEMP_B
CLIP_A
CLIP_B
M-
NTC Sense
RMSLIM
Comun Comun.Sch
FBKA
FBKB
FBKC
FBKD
OUTA
OUTD
OUTB
OUTC
REPL. BY
Sheet 1 of 8DWG No.
DRAWN
DESIGN
REPLACE
RAM Audio - S Series
S3004 - S4004 - S4044
Signals Block Diagram
A
7654321
8
B
C
D
A
B
C
D
+15
-15
R32
GA
C30
D7 1N4148
R44
R137
C62
470n/50V
47k
39k
M+
5551
GA
T15A
R50
Q61
MSA
2n2/100V
100n/100V
R70
4k7
-15
C31
100u/16V
MA
D9 1N4148
47k
LIMA2
100k
R89
10k
Q69
5401
T16A
1N4148
D24
LIMA
Q135
5551
C194
R422
2k
C191
10u/35V
T22A
IOUT-A
1 2 3 4 5 6 78
GA
20k
GA
R113
3k92
-15
GA
6
7
R88
1M
Q72
MPSA13
R104
+15
+15
R71
D20
1N4148
39k
150k
5401
R404
330R
R402
1k8
R417
220R
R423
10R/1W
R5
0R33/4W
R6
0R33/4W
R7
0R33/4W
D98 MURS160T3
R61
2k
3k3
5
LM393
T18A
T14A
D13 1N4148
R420
R407
Q133
-15
R69
1M
U6B
RMSLim
D16 1N4148
+15
1N4148
D15
Q66
MPSA13
R121
2k7
D23 1N4148
LIMA
G1A
-15
100n/100V
C192
R409100R
G1A
MJF15031
Q1
1N4148
Q134
5551
R401
100k
T20A
R397
15k
D83
1N4148
BAS85
Q2
MJE15032
Q3
MJW21196
IOUT+A
Q4
MJW21196
Q5
MJW21196
GA
R43
3k3
3
2
84
10u/35V
C29
10u/35V
U6A
LM393
GA
1
47k
T12A
MA
-15
R112
100k
D1C
LEDC
Gadap
-15
R381
20k
D77
1N4148
M-
Q140
MMBTA92
470p/50V
C201
Q132
PZT2907A
R450
75R
T24A
G1A
D92
MURS160T3
D90
D94
+15
GA
Q67
5551
LEDA
-15
ERRORA
R421
12k
R74
10k
R60 82k5
C48
R68
4k7
R75
R102
10k
TEMP_INA
R87
1k5
D1B
GA
TEMP_AINA
R128
47k
RT1 N TC 10k
G1A
t
G1A
620R
D82
1N4148
M+
Q150
MMBTA42
100p/50V
C188
470p/50V
C196
R437
75R
R439
4R7/1W
R442
22R/1W
33n/100V
C202
OUTA
OUTA
15k
47u/16V
R398
100R
J10
1k5
R49
5551
LEDA
-15
5551
GA
R65
C51
47u/16V
-15U1
Adapt In 1
R86
475R
Q57
Q58
123
TEMP_INA
+15
R123
100R
GA
C64
47u/16V
+15U1
J13
SIGNAL_INA
Gadap
-15
7
-15OTA1+15OTA1
GA
Q65
5401
T10A
Q60
5401
R59
1k
CLIP_INA
D1D
R124
680R
10u/35V
5551
C46
5
GsA
3k3
7k5
470p/50V
8
324
C54
GsA
8 9
S4B
GAB
R98
390k
20k
1
116
U8A
LM13700M
R101100R
R111
100R
R103
Q64
R67
GA
R125
100k
Q74
MPSA13
J24
IN.A
1
2
INA- INA+
R83
10k
R95
10k
R96
10k
GsA
C61
100p/50V
3
2
8 4
+15U1
U7A
5532
T1A
R46
4k7
100n/100V
100n/100V
S6H
SWAB
R56
47k
R93 475R
38dB
R94 1k5
32dB
R109 NC
26dB
GsA
LIMA
GsA
T5A
R117
LIMA2
GsA
R100
100R
GA
R99
39k
+15
12k
+15
SWAB
R126
3k3
R119
47k
Q71
5401
470p/50V
4k7
470p/50V
C57
R118
S6F
+15
C52
22p/50V
+15
6
R82
C43
1k5
7
T2A
10u/50V
R1
10k
10u/50V
R47
47k
20k
C44
100p/50V
GsA
C E
R84
3
2
-15U2
5532
R97
1k5
T4A
1
C47
100u/16V
nc
R85
1k
+15
611
R66
C36
15k
10p/100V
T8A
FBKA
R73
C40
-15U1
10k
nc
nc
+15U2
GsA
6
C25
C26
15k
7
ERRORA
7 10
15k
R48
5
5532
T6A
S6G
SWAB
C35
220n/50V
R64
LEDA
GsA
100p/50V
U5B
3k3
10u/16V
75k
GA
100p/50V
R116
C55
R55
470k
R108
-15
GA
GA
R72
1k5
C42
10u/16V
Q63
5401
D1A
R178
10k
-15
Q80
5551
R196
10k
SIGNAL_INA
+15
C28
1
C38
C39
5
U7B
5532
C24
C19
R42
MSA
B
T3A
Q59
SST111
84
U5A
BRIDGEA
C53
R57
300k
T7A
OUTA
+15
-15
+15
+15
T11A
R127
1N4148
D115
NTC Sense
+15
R382
3k01
C177
R399
12k
RV2
500R
R388 475R
+15
R383
20k
G1A
+15
C206
100n/100V
R446
100R
G1A
R452
150k
MJF15030
Q8
Q143
PZT2222A
MURS160T3
D107
1N4148
1N4148
MJE15033
T19A
D103
Q145
5401
R427
100k
R426
15k
BAS85
D116
Q14
Q9
MJW21195
Q10
MJW21195
Q11
MJW21195
MURS160T3
R135
100R
R120
100R
GB
C56
47u/16V
C72
47u/16V
+15OTA1
-15OTA1
J14
Adapt In 4
Adapt In 3
123
IOUT+A
IOUT-A
+V2AC
CLIP_A
SIGNAL_A TEMP_A
Adapt Ou t
11 12
13 14
15 16
Q147
5401
2n2/100V
C204
R447
2k
R441
39k
10u/35V
C203
T21A
Q146
5551
R432
330R
R428
1k8
D101
220R
R448
R449
10R/1W
R8
0R33/4W
R9
0R33/4W
R10
0R33/4W
D113
+15
-15
R110
100R
R31
100R
GA
C45
47u/16V
C27
47u/16V
+15U2
-15U2
J7
Adapt In 2
123
1
2
CLIP_INA
TEMP_AINA
OUTA
Gadap
Gadap
VRAIL_A
VOUT_A
IOUT_A
TEMPA_A
J19
1 2
3 4
5 6
7 8
9 10
+15
-15
G15
LIMA
D17
1N4148
T9A
-15
R58
1k5
GA
DRAWN
DESIGN
REPLACE
REPL. BY
RAM Audio - S
S3004 - S4004- S4044
Channel A Schematic
Sheet 2 of 8DWG No: Channel A.Sch
-V2AC
IRFI1310N
Q7
R405
47R
5551
Q141
5401
R411
7k5
1N4148
R418
3k92
D99
12V
R412
10k
R416
10k
R415
47k
R414
47k
A
R419
15k
D100
15V
5551
Q139
5551
D88
Q137
47k
1n/100V
1N4148
22u/16V
C190
100p/100V
R413
D96
1N4148
R410
10k
C187
100n/100V
C189
D89
FFPF30U60S
R406
1R/1W
C186
Q138
27p/100V
D91
-V1AC
C193
R424
NC
Q136
5401
D87
D97
1N4148
1N4148
OUTA
D93
12V
B
100n/100V
1R/1W
C200
D102 FFPF30U60S
R436
+V1AC
R429 100k
Q142
5551
D108
1N4148
1N4148
OUTA
IRFI1310N
Q151
5401
D110
D105
12V
Q13
+V2AC
R431
15k
D112
15V
R445
47R
Q149
5551
D1171N4148 D111
R444
10k
R443
3k92
5401
R438
10k
1N4148
1N4148
D104
1N4148
R430 10k
C199
1n/100V
C
C197 27p/100V
Q144
5551
D106
1N4148
22u/16V
C205
R440
2k
Q148
D109
100p/100V
C198
R435
47k
R434
47k
+V2AC
47k
R433
D
7654321
8
A
-15
+15
R136 15k
GB
C74
1 2 3 4 5 6 78
GB
20k
GB
R212
3k92
-15
GB
470n/50V
DESIGN
REPLACE
REPL. BY
S3004 - S4004- S4044
Channel B Schematic
Sheet 3 of 8DWG No: Channel B.Sch
100n/100V
GB
R176
4k7
-15
C78
100u/16V
MB
M+
D26 1N4148
D29 1N4148
47k
R145
R151
47k
LIMB2
Q79
5551
100k
R195
10k
Q88
5401
T16B
R229
1N4148
D46
39k
C107
LIMB
MSB
2n2/100V
Q193
5551
C246
R543
2k
C245
10u/35V
T22B
0R33/4W
IOUT-B
T28B
DRAWN
RAM Audio - S
R162
10k
5
6
LM393
7
T18B
R194
1M
T14B
D37 1N4148
Q89
MPSA13
R205
+15
+15
R177
D44
1N4148
R542
39k
Q200
5401
R564
330R
R566
1k8
R548
220R
R544
10R/1W
R17
0R33/4W
R18
R19
0R33/4W
D186
MURS160T3
-15
R175
1M
U12B
RMSLim
D39 1N4148
+15
1N4148
D38
Q83
MPSA13
R218
2k7
D45 1N4148
LIMB
G1B
-15
100n/100V
C241
R554100R
G1B
R535
150k
MJF15031
Q35
1N4148
Q199
5551
R567
100k
T20B
R569
15k
D195
1N4148
BAS85
Q29
MJE15032
Q30
MJW21196
Q31
MJW21196
IOUT+B
Q32
MJW21196
-V2BD
IRFI1310N
47R
Q194
5401
7k5
R547
3k92
D181
12V
10k
R540
10k
R541 47k
47k
R539
GB
R144
2k7
3
2
84
10u/35V
C73
10u/35V
U12A
LM393
GB
1
47k
T12B
MB
-15
R211
100k
D2C
LEDC
Gadap
-15
R691
20k
D274
1N4148
M-
Q185
MMBTA92
470p/50V
C258
Q195
PZT2907A
R570
75R
T24B
G1B
D192
MURS160T3
D193
D187
15k
Q34
D182
15V
R546
Q192
5551
R533
D168
1N4148
Q190
5551
R532
R534
47k
10k
C240
1n/100V
+15
GB
Q86
5551
-15
ERRORB
R552
12k
R553
22u/16V
C237
100p/100V
D174
1N4148
R531
LEDB
R185
12k
R161 82k5
C93
R174
4k7
R186
R204
10k
R193
1k5
TEMP_INB
D2B
GB
TEMP_AINB
R146
47k
15k
RT3 NTC 10k
G1B
t
G1B
47u/16V
R683
620R
D273
1N4148
M+
Q203
MMBTA42
100p/50V
C260
470p/50V
C266
R594
75R
R600
4R7/1W
R592
22R/1W
33n/100V
C261
OUTB
OUTB
D194
FFPF30U60S
C238
5551
Q189
27p/100V
D171
1N4148
-V1BD
C243
Q188
5401
D163
D175
1N4148
1N4148
D191
12V
+15
+15
R129
C300
R387475R
1R/1W
100n/100V
R538
NC
12k
PZT2222A
IN.B
R189
3
T1B
100n/100V
100n/100V
6
7
R150
3
5532
1
nc
R216
2
2
1
C85
C86
5
U17B
5532
10u/50V
SST111
T3B
U15A
R209
300k
T7B
OUTB
D
J28
1
R201
10k
R184
C87
-15U3
10k
nc
C71
MSB
+15U4
6
C66
SWAB
T29B
GsB
15k
7
ERRORB
2 15
15k
GsB
R192
5
5532
T6B
SWAB
220n/50V
R168
LEDB
5 12
U15B
S6B
10u/16V
C81
S6E
GsB
S6D
SWAB
100p/50V
100p/50V
R215
3k3
C98
R154
470k
R207
75k
-15
GB
GB
R183
1k5
C89
10u/16V
Q81
5401
D2A
R179
10k
GB
SIGNAL_INB
C92
-15
Q77
5551
R163
10k
+15
413
BRIDGEA
7654321
8
U17A
nc
Q87
R225
1k5
84
C113
B
-15
R170
100R
47u/16V
-15U4
J16
Adapt In 4
123
IOUT+B
IOUT-B
Gadap
T11B
1N4148
D203
NTC Sense
+15
R689
3k01
R684
500R
RV4
Q212
R605
Q37
MJW21195
Q38
MJW21195
Q39
MJW21195
15k
150k
5401
R568
T19B
Q215
R608
BAS85
MURS160T3
5401
2n2/100V
C263
R576
2k
R584
39k
10u/35V
C264
T21B
Q217
5551
R603
330R
R604
1k8
D221
220R
R585
R577
10R/1W
R20
0R33/4W
R21
0R33/4W
R22
0R33/4W
T27B
D219
C265
100n/100V
R602
1R/1W
R601
100k
OUTB
+15
R688
20k
G1B
+15
C251
100n/100V
R578
100R
G1B
MJF15030
Q42
Q213
MURS160T3
D217
D220
1N4148
100k
D213
1N4148
Q36
MJE15033
R565
C250
OUTB
C
+15
R226
100R
GB
C103
47u/16V
C91
+15U4
J8
Adapt In 3
123
CLIP_INB
TEMP_AINB
Gadap
CLIP_B
SIGNAL_B TEMP_B
Adapt Ou t
11 12
13 14
15 16
LIMB
D43
1N4148
T9B
-15
R171
1k5
GB
IRFI1310N
D216 FFPF30U60S
5401
+V1BD
5551
Q214
D215
D214
1N4148
1N4148
D218
12V
+15
-15
R220
100R
R169
100R
GB
C111
47u/16V
C94
47u/16V
+15U3
-15U3
J15
Adapt In 1
J11
Adapt In 2
123
1
2
TEMP_INB
SIGNAL_INB
GsB
-15
Q85
680R
Q208
10u/35V
R227
15k
D198
R599
R598 47k
C77
12
5551
R590
C25222u/16V
100p/100V
C257
R591
47k
47k
GsB
390k
9
141513
R160100R
100R
R217
3k3
Q84
R172
7k5
C95
470p/50V
1N4148
R156
LM13700M
R210
100k
MPSA13
2k
3 14
R208475R
38dB
R2001k5
32dB
S4A
GAB
R199NC
26dB
GsB
LIMB
GsB
T5B
R142
20k
LIMB2
16
GsB
U8B
R159
100R
GB
R157
39k
+15
R143
12k
+15
SWAB
R224
3k3
R223
GB
47k
R228
Q90
5401
Q91
+V2BD
Q210
5551
C262
27p/100V
D209
R575
+V2BD
SWAB
OUTB
Gadap
Gadap
VOUT_B
IOUT_B
TEMPA_B
J20
1 2
3 4
5 6
7 8
9 10
+15
-15
G15
10
GB
R203
475R
5401
1k5
Q75
5551
T10B
R158
Q76
5551
Q82
5401
GB
R173
1k
CLIP_INB
D2D
LEDB
Q41
D199
15V
R583
47R
Q206
5551
Q207
R582
D1971N4148 D208
10k
R573
3k92
5401
R589
10k
1N4148
1N4148
D206
1N4148
R597
10k
C259
1n/100V
GsB
S6C
470p/50V
4k7
470p/50V
S6A
+15
C99
22p/50V
+15
C90
T2B
10k
47k
R221
-15U4
1k5
C112
116
INB- INB+
10k
R202
10k
C108
100p/50V
8 4
+15U3
5532
R149
4k7
R155
47k
R188
1k5
C70
R2
10u/50V
C67
R190
20k
C109
100p/50V
GsB
2
R222
T4B
C110
100u/16V
1k
+15
R191
C104
15k
10p/100V
T8B
FBKB
A
B
C
D
A
B
C
D
+15
-15
R232 3k3
GC
C122
D47 1N4148
R238
R302
C144
470n/50V
100n/100V
GC
R253
4k7
-15
C121
100u/16V
MC
M+
D48 1N4148
47k
R239
47k
LIMC2
Q96
5551
100k
R266
10k
Q103
5401
T16C
1N4148
D55
39k
LIMC
MSC
2n2/100V
Q172
5551
C236
R516
2k
C231
10u/35V
IOUT-C
0R33/4W
0R33/4W
T28C
1 2 3 4 5 6 78
GC
20k
GC
R293
3k92
-15
GC
R246
2k
5
6
LM393
7
T18C
R265
1M
T14C
D49 1N4148
Q106
MPSA13
R284
+15
+15
R259
D53
1N4148
39k
T22C
5401
R494
330R
R495
1k8
R512
220R
R521
10R/1W
R14
R16
0R33/4W
R15
D151
U19B
R520
Q170
1M
+15
Q101
MPSA13
R519
150k
5551
T20C
15k
IOUT+C
MURS160T3
G1C
Q169
R252
R492
D51 1N4148
1N4148
D50
LIMC
100n/100V
G1C
BAS85
-15
RMSLim
R291
2k7
D54 1N4148
C233
R498100R
MJF15031
Q22
1N4148
R493
100k
D145
1N4148
MJE15032
Q24
MJW21196
Q25
MJW21196
Q26
MJW21196
GC
R237
3k3
3
2
84
10u/35V
C120
10u/35V
U19A
LM393
GC
1
T12C
47k
MC
-15
R292
100k
D3C
LEDC
Gadap
-15
R384
20k
D78
1N4148
M-
-15
Q182
MMBTA92
470p/50V
Q168
PZT2907A
75R
T24C
G1C
D152
MURS160T3
D150
D155
Q23
5551
C215
R486
+15
GC
Q102
LEDC
-15
ERRORC
12k
R257
10k
R245 82k5
C133
R251
4k7
R258
R274
10k
R275
1k5
TEMP_INC
D3B
GC
TEMP_AINC
R131
47k
RT2 N TC 10k
G1C
t
G1C
D84
1N4148
MMBTA42
R503
100p/50V
C209
470p/50V
C210
R461
75R
R467
4R7/1W
R473
22R/1W
33n/100V
C216
OUTC
OUTC
+15
-15
R298
100R
R297
1N4148
1N4148
R474
NTC Sense
+15
+15
+15
G1C
MJF15030
Q18
Q19
MJE15033
100R
GD
C139
47u/16V
C148
47u/16V
+15OTA2
-15OTA2
J18
Adapt In 4
Adapt In 3
123
123
CLIP_INC
IOUT+C
IOUT-C
Gadap
Adapt Ou t
Q158
5401
2n2/100V
C221
2k
R470
39k
10u/35V
C219
R479
150k
T21C
Q156
5551
R459
330R
T19C
D122
Q155
5401
R456
15k
MJW21195
MJW21195
MJW21195
R454
BAS85
MURS160T3
1k8
D118
220R
R481
R485
10R/1W
R12
0R33/4W
R11
0R33/4W
R13
0R33/4W
D120
R455
100k
D136
Q15
Q16
Q17
+15
+15
T11C
R130
15k
1N4148
D135
R378
3k01
C174
47u/16V
R396
12k
R403
620R
500R
RV1
R389475R
M+
Q162
PZT2222A
R379
20k
G1C
C224
100n/100V
100R
Q153
MURS160T3
D127
+15
-15
R282
100R
R231
100R
GC
C131
47u/16V
C117
47u/16V
+15U6
-15U6
J9
J12
Adapt In 2
1
2
TEMP_AINC
OUTC
Gadap
Gadap
VOUT_C
IOUT_C
TEMPA_C
CLIP_C
SIGNAL_C TEMP_C
J21
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
+15
-15
G15
1N4148
T9C
R243
1k5
R480
T27C
+15
-15
R294
100R
R248
100R
GC
C143
47u/16V
C134
47u/16V
+15U5
-15U5
J17
Adapt In 1
123
TEMP_INC
SIGNAL_INC
Gadap
GsC
-15
C132
10u/35V
5
7
-15OTA2
LIMC
D52
-15
1k5
R236
GC
GC
R264
475R
Q98
5401
Q92
5551
Q93
5551
GC
D3D
LEDC
R283
3k3
T10C
5551
Q95
5401
7k5
R244
1k
470p/50V
CLIP_INC
R295
680R
GsC
8 9
S5B
GCD
R270
390k
20k
8
1
116
U20A
LM13700M
324
R273100R
R290
100R
Q100
R250
C137
R296
100k
Q105
MPSA13
GsC
100p/50V
S7H
SWCD
R279475R
38dB
R2801k5
32dB
R278NC
26dB
C129470p/50V
T2C
GsC
10k
LIMC
GsC
47k
T5C
R287
GsC
LIMC2
GsC
R262
4k7
+15OTA2
R272
100R
GC
-15U6
470p/50V
1k5
C140
R271
39k
+15
R288
12k
+15
+15
611
S7F
SWCD
+15
R249
R299
3k3
C135
15k
22p/50V
T8C
R289
GC
47k
Q104
5401
+15
IN.C
INC- INC+
R268
10k
R281
10k
C142
3
8 4
+15U5
5532
T1C
R233
4k7
100n/100V
100n/100V
R241
47k
6
R261
1k5
7
10u/50V
C116
R3
10u/50V
C115
R234
R230
20k
100p/50V
C130
C E
3
2
5532
R269
T4C
1
C136
100u/16V
nc
R263
1k
C124
10p/100V
FBKC
1
5
5532
T3C
U18A
OUTC
2
R242
300k
1
10k
2
U21A
C125
C126
U21B
MSC
B
SST111
84
BRIDGEC
C141
T7C
J30
R267
R256
C127
-15U5
10k
100p/50V
7 10
R286
3k3
S7G
SWCD
C138
10u/16V
C123
220n/50V
R247
15k
C114
nc
LEDC
nc
C118
GsC
Q94
+15U6
GsC
R235
15k
100p/50V
5
6
U18B
5532
7
T6C
ERRORC
R240
470k
R277
75k
-15
GC
GC
R255
1k5
C128
10u/16V
Q99
5401
D3A
R180
10k
GC
SIGNAL_INC
C119
-15
Q78
5551
R164
10k
+15
DRAWN
DESIGN
REPLACE
REPL. BY
RAM Audio - S
S3004 - S4004- S4044
Channel C Schematic
Sheet 4 of 8DWG No: Channel C.Sch
C217
47k
R483
C21422u/16V
R484
+V2AC
Q166
5551
C222
27p/100V
1N4148
D140
7654321
R478
2k
+V2AC
D
8
-V2AC
IRFI1310N
Q28
R510
47R
5551
Q184
5401
R515
7k5
R525
3k92
D166
12V
R514
10k
R523
10k
R524
47k
47k
R522
A
R527
15k
D167
15V
Q183
22u/16V
D154
1N4148
Q179
5551
R517
47k
1N4148
R513
10k
C232
1n/100V
5551
Q176
1N4148
C235
100p/100V
D164
D144
100n/100V
C223
C230
FFPF30U60S
R491
1R/1W
27p/100V
D161
-V1AC
C239
R518
NC
Q178
5401
D153
D165
1N4148
1N4148
OUTC
D162
12V
B
D119 FFPF30U60S
R453
1R/1W
C208
100n/100V
+V1AC
R487
100k
5551
Q165
D142
1N4148
1N4148
OUTC
D141
12V
C
IRFI1310N
5401
D143
Q21
15k
D131
15V
R472
47R
Q160
5551
Q157
R477
D1381N4148 D139
10k
R465
3k92
5401
R482
10k
D137
1N4148
Q161
D130
100p/100V
1N4148
1N4148
R488
10k
C220
1n/100V
R490 47k
R489 47k
A
20k
GD
-15
PZT2907A
15V
5551
R685
Q239
D250
Q235
1n/100V
C151
10u/35V
MURS160T3
R655
47k
GD
R306
2k7
3
2
84
10u/35V
U22A
LM393
1
47k
T12D
MD
-15
R356
100k
D4C
LEDC
Gadap
ERRORD
D271
1N4148
M-
Q233
MMBTA92
12k
470p/50V
C275
R610
75R
T24D
G1D
D268
R668
15k
D266
5551
Q236
1N4148
22u/16V
C286
100p/100V
D253
1N4148
R650
10k
C285
R329
12k
+15
R316 82k5
C162
GD
R323
4k7
R330
R342
10k
Q116
5551
R343
1k5
TEMP_IND
D4B
LEDD
GD
-15
TEMP_AIND
R276
47k
RT4 N TC 10k
G1D
t
G1D
620R
D272
1N4148
M+
Q219
MMBTA42
R645
100p/50V
C297
470p/50V
C281
R632
75R
R638
4R7/1W
R631
22R/1W
33n/100V
C276
OUTD
OUTD
D259
1R/1W
C284 27p/100V
FFPF30U60S
D251
100n/100V
C296
-V1BD
Q234
5401
D249
D252
1N4148
1N4148
D254
12V
+15
-15
R301
GD
C152
D56 1N4148
R307
C178
470n/50V
M+
47k
5551
R371
39k
2n2/100V
100n/100V
GD
R325
4k7
-15
C154
100u/16V
MD
D57 1N4148
47k
R308
LIMD2
Q109
100k
R344
10k
Q117
5401
T16D
1N4148
D69
LIMD
MSD
Q243
5551
C293
R653
2k
C292
10u/35V
T22D
0R33/4W
0R33/4W
0R33/4W
T28D
1 2 3 4 5 6 78
GD
20k
GD
R357
3k92
-15
GD
DRAWN
DESIGN
REPLACE
REPL. BY
RAM Audio - S
S3004 - S4004- S4044
Channel D Schematic
Sheet 5 of 8DWG No: Channel D.Sch
R350
330R
1k8
220R
10R/1W
1M
R331
R678
R677
R659
R648
R26
R27
R28
5
6
LM393
7
T18D
R335
T14D
D60 1N4148
Q120
MPSA13
+15
+15
D66
1N4148
R647
39k
Q248
5401
D258
MURS160T3
-V2BD
15k
U22B
R670
150k
5551
T20D
15k
5401
10k
1M
+15
Q114
MPSA13
G1D
Q245
R680
IRFI1310N
Q242
12V
R660
R657
R317
R324
D62 1N4148
1N4148
100n/100V
C287
G1D
BAS85
47R
R667
3k92
D265
R661
10k
47k
47k
R671100R
100k
Q51
Q52
Q53
D61
D68 1N4148
LIMD
MJF15031
1N4148
R679
D270
1N4148
MJW21196
MJW21196
MJW21196
R646
7k5
10k
Q56
MJE15032
-15
RMSLim
R355
2k7
-15
D269
D267
Q50
Q55
Q238
5551
R651
1N4148
R658
15k
47u/16V
R681
R673
OUTD
IN.D
3
7
3
R339
R304
2
1
5
5532
10u/50V
10u/50V
T3D
U24A
R354
300k
OUTD
D
J32
1
R338
10k
2
R327
C157
-15U7
10k
nc
nc
SWCD
MSD
+15U8
6
C145
C149
SST111
T29D
GsD
15k
7
ERRORD
2 15
15k
5 12
Q118
5
5532
T6D
SWCD
220n/50V
R318
LEDD
GsD
S7E
R334
U24B
S7B
10u/16V
C153
GsD
S7D
SWCD
100p/50V
100p/50V
R352
3k3
C164
R309
470k
R345
75k
-15
GD
GD
R326
1k5
C158
10u/16V
Q111
5401
D4A
R260
10k
GD
10k
SIGNAL_IND
C161
-15
Q97
5551
R254
+15
413
BRIDGEC
7654321
8
U23A
C155
C156
U23B
R366
1k5
84
C175
nc
T7D
B
-15
R320
100R
123
Gadap
C280
R641
R643
R618
R615
R25
R24
T27D
IOUT-D
2n2/100V
R23
GD
47u/16V
C160
47u/16V
-15U8
J26
Adapt In 3
123
CLIP_IND
TEMP_AIND
Gadap
CLIP_D
SIGNAL_D TEMP_D
Adapt Ou t
13 14
15 16
C278
R617
2k
T27D
100n/100V
1R/1W
R639
100k
+15 +15
Adapt In 4
T11D
R285
1N4148
D229
NTC Sense
+15 +15
R687
3k01
C299
R682
12k
RV3
500R
R390475R
Q229
R642
Q43
MJW21195
Q44
MJW21195
Q45
MJW21195
15k
150k
5401
R607
Q231
R644
BAS85
MURS160T3
5401
R628
39k
10u/35V
T21D
Q232
5551
330R
1k8
D247
220R
10R/1W
0R33/4W
0R33/4W
IOUT-D
0R33/4W
D242
R686
20k
G1D
+15
C268
100n/100V
R619
100R
G1D
MJF15030
Q49
Q227
PZT2222A
MURS160T3
D245
D246
1N4148
100k
D238
1N4148
Q46
MJE15033
C291
C
+15
R377
100R
C169
+15U8
J33
Adapt In 2
TEMPA_D
7 8
9 10
11 12
1N4148
T9D
R321
1k5
C283
R640
+V1BD
5551
Q228
1N4148
OUTD
12V
+15
-15
R359
100R
R319
100R
GD
C172
47u/16V
C163
47u/16V
+15U7
-15U7
J27
Adapt In 1
J31
123
1
2
TEMP_IND
SIGNAL_IND
OUTD
Gadap
Gadap
VOUT_D
IOUT_D
J22
1 2
3 4
5 6
-15
G15
+15
10
LIMD
D65
R341
475R
-15
1k5
Q107
5551
T10D
R313
Q108
5551
5401
GD
1k
CLIP_IND
D4D
LEDD
GD
IRFI1310N
5401
D240
Q48
R614
47R
5551
Q221
R616
10k
R609
3k92
R625
10k
D234
1N4148
R635
10k
1n/100V
D243 FFPF30U60S
D241
1N4148
D244
GsD
3 14
SWCD
R346475R
38dB
GsD
R3471k5
32dB
S5A
GCD
R353NC
26dB
GsD
R311
390k
LIMD
9
141513
R315100R
100R
R349
Q112
R328
7k5
C166
470p/50V
R626
100p/100V
C273
47k
R636 47k
LM13700M
R363
100k
MPSA13
C27022u/16V
R627
GsD
T5D
R305
20k
LIMD2
16
GsD
U20B
R314
100R
GD
R312
39k
+15
R300
12k
+15
S7A
SWCD
R370
3k3
R362
GD
47k
R369
Q119
5401
Q121
Q225
5551
27p/100V
1N4148
D236
R613
2k
+V2BD
-15
C150
10u/35V
12
GD
Q113
5401
3k3
5551
Q110
R322
R368
1k5
15k
D223
15V
Q223
D2271N4148 D235
5401
Q220
D228
1N4148
1N4148
C274
R637 47k
GsD
S7C
470p/50V
4k7
470p/50V
+15
C165
22p/50V
+15
+V2BD
C277
C159
T2D
10k
R360
-15U8
R367
C179
116
R348
10k
C173
100p/50V
8 4
+15U7
5532
R303
4k7
R310
47k
R332
1k5
C146
R4
C147
R333
47k
C168
100p/50V
GsD
2
1k5
T4D
C171
100u/16V
1k
+15
C170
R340
10p/100V
15k
T8D
FBKD
IND- IND+
10k
T1D
100n/100V
100n/100V
6
20k
5532
1
R361
A
B
C
D
A
B
C
D
D282
47k
10k
T34
G
100k
R712
33u/16V
R716
R537
1N4148
T32
Q253
5401
R709
1M
G
G
C305
G
Q251
5401
R713
47k
D283
1N4148
+RM
15AC
R529
10k
47k
Q181
5551
R528
5551
1N4148
1k
Q180
D176
1N4148
G
R536
T15
M+M-
D275
1 2 3 4 5 6 78
D284
5V1
+15
R704
300k
T33
G
D5D
STBY+ON
R700
3k92
-RM
R703
47k
R530
1k
5401
T38
1N4148
G
Q186
D172
G
R526
47k
Q187
5401
NTC Sense
T30
G
Q249
5401
R358
14k
-15
D59
5V1
D58
12V
7k5
100k
R336
R351
1k
+15
8 4
47u/16V
G
100k
MJD350
Q12
MJD350
Q20
24V DC FAN1
1
R698
C306
R374
C303 1n/100V
R690 100k
+15
G
R365
100R
3
2
-15
C3 100n/100V
47u/16V
U25A
LM393
C308
G
1
R364
1k
R372
2k
R380
10R
Q6
5401
T31
47u/16V
C14
R337
4k7
R373
7k5
R385
4R7
+15
R386
4R7
J38
2
J4
A XLR F
4
3
2
1
J3
B XLR F
4
3
2
1
J2
C XLR F
4
3
2
1
J1
D XLR F
4
3
2
1
J6
FASTON
2
1
J25
FASTON
2
1
S3
PARAL
J5
CON8
8
7
S2
PARAL
S1
PARAL
6
5
4
3
2
1
REPL. BY
Sheet 6 of 8DWG No: Comun.Sch
-V1BD
-V1AC
D170
-RM
1N4148
G G1A G1B G1C G1D GsA GsB GsC GsD GA GB GC GD GADAP G15
G5
D173
1N4148
D178
1N4148
DRAWN
DESIGN
REPLACE
RAM Audio - S Series
S3004 - S4004- S4044
Inputs, protections & fans
+V1BD
+V1AC
+RM
D169
1N4148
G
G
100k
100u/10V
R693
C307
OUTD
R692
100k
C304
100u/10V
R674 33k
D280 1N4148
OUTB
R66933k
1N4148
L3
100uH
10u/35V
10u/35V
L2
100uH
24V DC FAN2
1
2
OUTA
OUTC
G
R694
100k
G
C301
100u/10V
D276
G
R695
100k
C298
100u/10V
R705
10k
LM393
R376 33k
U25B
D279 1N4148
1n/100V
6
T37
1k5
R375 33k
1N4148
T36
C309
7
DCS
D277
5
R696
C15
C16
J39
10k
20k
150k
L5
100uH
L4
100uH
-15
TEMP_A
VOUT_B
TEMPA_B
CLIP_B
SIGNAL_B
TEMP_B
17 18
19 20
21 22
23 24
25 26
SIGNAL_A
TEMPA_A
IOUT_B
CLIP_A
CLIP_C
LSTBY
G +15
R711
R710
470n/50V
R697
C302
10u/100V
C8
+V2BD +V1BD -V2BD-V1BD
C182
10u/100V
D5A
STBY+ON
10u/100V
C9
10u/100V
C11
10u/100V
C12
10u/100V
C13
R701
330R
-15
G
470n/50V
10u/100V
C10
+V2AC +V1AC
-V2AC-V1AC
10u/100V
C183
TEMP_D
13 14
15 16
VOUT_A
IOUT_A
C312
-
C311
1k
Cinta
10u/100V
10u/100V
10u/100V
10u/100V
VOUT_C
VOUT_D
IOUT_D TEMPA_D
SIGNAL_C
TEMP_C CLIP_D
VRAIL_A
EtheRAM Signals
1 2
3 4
5 6
7 8
9 10
11 12
SIGNAL_D
TEMPA_C
IOUT_C
RMSLim
T13
+15
R715
DCS
Cinta
J37
123
4
C4
+V2BD
+V1BD
-V1BD
C5
C7
C6
-V2BD
JST
6
-15
GsA
GsC
G15 +15
INB+
G5
G5
J29
17 18
19 20
+5
15AC
+15
-15
G5
+5
OUTD
OUTB
JST
J36
12345
IND+
INC-
J23
EtheRAM IN
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
INA+INA-
INC+
INB-
+5
FBKD
IND-
GsB
GsD
FBKA
FBKB
FBKC
J34
123456789
+V2AC
+V1AC
-V2AC
-V1AC
OUTA
OUTC
J35
12345
6
7654321
8
A
B
C
D
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