Text preview for : crest audio RA series.pdf part of Crest RA series pwr amp RA series pwr amp



Back to : crest audio RA series.pdf | Home

R144 22R R24 150R R25 2K7 R27 680R R29 82K
GATE RESISTORS R127 - R132

LABEL HT+

F

C20

100NF/ 100V

C21 D1 OPT 1N4148

LABEL LT+1

Q3 BF422 C17 100UF R37 OPT D2 1N4148 VR3 470R

Q4 BF422 R31 100R R28 100R

D28 IN4004 Q11 BF422 Q12 BF423 Q16 BF422 BF422 Q17 R127 560R R128 560R E D19 IN4004

Q5 BC184L

Q6 BC184L C31 OPT Z5

A
R43 330R R30 1K D5 1N4148 VR1 1K C25 100UF 25V Z4 6V2 C30 100NF
/

Q1 BF423 R33 100R R46 100R R47 100R R35 100R

Z3 6V2 R60 OPT C24 100UF/ 16V R59 39K

R39 5K6

Q15 BF422

CHOKE1 R41 220R 15 TURNS R73 LABEL O/P1

LABEL
AMP1

R11 1K

C28 100UF D6 1N4148

10R/2.5W D R72 10R/2.5W R58 1K Z6 R146 10R/2.5W

R44 100R C22 220PF R34 39K R32 220K

R45 100R

R48 100R

R49 100R

C29 100UF/ 16V

R40 1K5 C23 100NF R36 1K R38 220K

R42 220R

C42 100NF/250V

C41 100NF/250V

LABEL
GND1

Q7 BC214L Q2 BF422

Q8 BC214L

B
Q18 BF423 LABEL GND

R56

100R R51 100R Q13 BF422

Q19 BF423

R115 560R

R116 560R

C D29 IN4004 D20 IN4004 LABEL LT-1
GATE RESISTORS R115 - R120

C18
100NF/ 250V

R50 OPT

Q9 BF423 D3 1N4148 R52 330R D4 1N4148 R53 2K7

Q10 BF423 Q14 BF423 R55 680R R57 82K

C33

C34 OPT

R143 22R R71 47R

LABEL HT-

B DIAGRAM SHOWS RA1000 OUTPUT STAGE. RA2000 AND RA3000 OUTPUT STAGES DIFFER IN THE NUMBER OF OUTPUT DEVICES PER RAIL. THE RA2000 USES 4 DEVICES PER RAIL AND THE RA3000 USES 6 DEVICES PER RAIL. ADDITIONAL OUTPUT DEVICES ARE CONFIGURED SIMILARLY WITH 560R GATE RESISTORS AS SHOWN. ON AMPLIFIERS WITH FLAT PACK (J162 K1058) MOSFETS FIT A 10pF >=250V WORKING ACROSS THE GATE, DRAIN OF EACH K1058 MOSFET

QUIESCENT VOLTAGE ADJUSTMENT THIS IS MEASURED ACROSS THE GATE DRIVE AT POINTS A B TO GIVE 300mV +/- 10mV

Title Size A3 Date: File: Number

CHANNEL 1 AMPLIFIER
Revision
RAMAIN 2 3

A

1-Jul-1999 D:\PROTEL\RANEW\RAMAIN.S02

Sheet of 2 Drawn By:

6 LMB

R145 C62 OPT C63 100NF/ 100V D17 1N4148 Q42 BF422 C66 100UF/100V R103 OPT D18 1N4148 VR4 470R Q41 BF422 R104 100R R110 100R Q40 BC184L Q39 BC184L C47 OPT Q44 BF423 R101 100R R92 100R R91 100R R99 100R Z11 6V2 R76 OPT C60 100UF/ 16V VR2 1K C56 100UF 25V Z10 6V2 C50 100NF
/

LABEL HT+

F

22R R114 150R R113 2K7 R111 680R R109 82K
GATE RESISTORS R133 - R138

LABEL LT+2

D32 IN4004 Q34 BF422 Q33 BF423 Q30 BF422 Q29 BF422 R133 560R R134 560R E D21 IN4004

A
Z8 R106 330R R108 1K D13 1N4148 R94 220R CHOKE2 15 TURNS R75 C55 100UF D14 1N4148 R95 1K5 C59 100NF R98 1K R97 220K Q27 BF423 100R R86 100R Q32 BF422 Q26 BF423 R121 560R R122 560R Z9 R78 1K R107 220R C43 100NF/250V C44 100NF/250V 10R/2.5W D R74 10R/2.5W R147 10R/2.5W LABEL O/P2

R96 5K6 R77 39K

Q28 BF422

LABEL
AMP2

R88 1K

C61 220PF

R100 39K

R102 220K

R89 100R

R93 100R

R90 100R

R87 100R

C54 100UF/ 16V

LABEL
GND2

Q38 BC214L Q43 BF422

Q37 BC214L

B
LABEL GND

R80

C D31 IN4004 D22 IN4004 LABEL LT-2
GATE RESISTORS R121 - R126

R85 OPT C65 100UF/100V
100NF/ 250V

Q36 BF423 D15 1N4148 R84 330R R83 2K7

Q35 BF423 Q31 BF423 R81 680R R79 82K

C52

C51 OPT

D16 1N4148

R142 22R R105 47R DIAGRAM SHOWS RA1000 OUTPUT STAGE. RA2000 AND RA3000 OUTPUT STAGES DIFFER IN THE NUMBER OF OUTPUT DEVICES PER RAIL. THE RA2000 USES 4 DEVICES PER RAIL AND THE RA3000 USES 6 DEVICES PER RAIL. ADDITIONAL OUTPUT DEVICES ARE CONFIGURED SIMILARLY WITH 560R GATE RESISTORS AS SHOWN. ON AMPLIFIERS WITH FLAT PACK (J162 K1058) MOSFETS FIT A 10pF >=250V WORKING ACROSS THE GATE, DRAIN OF EACH K1058 MOSFET

LABEL HT-

B

QUIESCENT VOLTAGE ADJUSTMENT THIS IS MEASURED ACROSS THE GATE DRIVE AT POINTS A B TO GIVE 300mV +/- 10mV

Title Size A3 Date: File: Number

CHANNEL 2 AMPLIFIER
Revision
RAMAIN 3 3

A

1-Jul-1999 D:\PROTEL\RANEW\RAMAIN.S03

Sheet of 3 Drawn By:

6 LMB

C7 JACK1

10PF NOTE:- FOR AMPS WITH FLAT PACK MOSFETS MC33079 IC IS FITTED TO POSITION IC1

LABEL HT+

R10

F

R12

10K

XLR1

1

11

3 R1 1K R2 9K1 2

IC1A MC33079 1

C6 R7 1K 100UF/16V

C4 R9 100K 100UF/16V

C9

10PF

3 COAX2SYM BLUE RED SCR COAX2SYM 2 R3 1K R4 9K1

R13

100K

C15 100UF/16V 7

6 5 Z1 18V

2

XLR2 C2 220PF 3

C3 10PF C1 220PF

4

R5 10K

R6 100K

R8 47K

IC1B MC33079

R22 100K

C5 100UF/25V LABEL GND

E

COAX2SYM Z2 18V C16 100UF/25V 1
RED BLUE SCR

COAX2SYM 9 8 10 IC1C MC33079
SEE NOTE:-

R23 LABEL HT-

D

VOL1 50K LIN

LABEL AMP1

LABEL GND1 C8 2 10PF

XLR3 R14 3 R15 1K R17 9K1 13 14 12 R16 COAX2SYM BLUE RED SCR COAX2SYM 1 1K R18 9K1 IC1D MC33079 C12 10PF 1 XLR4 C11 220PF 3 C10 220PF
BRIDGE/STEREO MODE SWITCH COAX2SYM

10K C13 R21 100UF/16V 1K C14 100UF/16V

RA3000/1 R10, R23 6K8/1W RA2000/1 R10, R23 6K8/1W RA1000/1 R10, R23 4K7/1W C

R19 10K

R20 100K

COAX2SYM RED BLUE SCR COAX2SYM

COAX1SYM RED
SCR

COAX1SYM LABEL AMP2

LABEL GND2 SW2 B

2

GREEN

GREEN

RED BLUE SCR

YELL

RED

JACK2

RGND 10R/2.5W SW1
GROUND LINK SWITCH

COAX2SYM

LABEL LT+ LABEL LEDBR

RA INPUT PCB

VOL2 50K LIN Title Size A3 Date: File:

INPUT STAGE CIRUITRY
Number
RAMAIN 1

A Revision
3

1-Jul-1999 D:\PROTEL\RANEW\RAMAIN.S01

Sheet of Drawn By:

1 LMB

6

55C NORMALLY OPEN THERMAL SWITCH

TRANSFORMER SECONDARY VOLTAGES QUOTED VOLTAGES ARE OFF LOAD AC (RMS) RA1000 RA2000 RA3000
RED

THERM1
RED FAN 24V DC

F

RTHERM 220R/1W C81 47UF/35V
BLACK

D33-D36 IN4004
(4 OFF) SEE TRANSFORMER WIRING DETAILS FOR CORRECT CONNECTION

RED 47 58 68 ORANGE 47 58 68 YELLOW 0 0 0 GREEN 52 63 73 BLUE 52 63 73

C82 47UF/35V

TX

AC:1 GREEN

0V GREEN/YELLOW E BROWN AC:2 RED

IEC

N

L

CHASSIS FUSE BROWN GREY ORANGE

S1

VOLTAGE FUSE1 SOFTSTART 100V 22R/23W 110V 2A T 22R/23W 220V 1.6A F 47R/23W 240V 1.6A F 47R/23W FUSE 1 SOFTSTART

2A T

CT YELLOW

E

220V UNUSED VOLTAGE TAP AC:3 ORANGE

BLACK

FRONT PANEL MOUNTED MAINS SWITCH

MAINS INPUT VOLTAGE SELECTOR. CONNECT REQUIRED TRANSFORMER VOLTAGE TAP. YELLOW

240V AC:4 BLUE RA TRANSFORMER

BLUE

RELAY3 4 LABEL
RLY3 (A)

D

9

LABEL

CON 5:1

LABEL LT+1 FUSE2 C72 C68 330NF/ 250V C70 DBR1 KBPC3504

LABEL

RLY3 (B)

5

C

LABEL LT-1

FUSE1

C67 330NF/ 250V

C71

C69

LABEL HT+ C79 2200UF/16V

D23-D26 IN4004 (4 OFF)

LABEL LT+

LABEL LT+2

FUSE3

B

C77 2 LABEL
STAR GND

C75

C73 330NF/ 250V

RA3000 C69, C70, C71, C72, C75, C76, C77, C78 4700UF/110V RA2000 C69, C70, C71, C72, C75, C76, C77, C78 4700UF/110V

LABEL LT-2

FUSE4

C74 330NF/ 250V

C78

C76

DBR2 KBPC3504

RA1000 C69, C70, C75, C76 4700UF/110V C71, C72, C77, C78 NOT FITTED

Title C80 2200UF/16V LABEL HTSize A3 Date: File:

RA POWER SUPPLY
Number
RAMAIN 4

A

Revision
3

1-Jul-1999 D:\PROTEL\RANEW\RAMAIN.S04

Sheet of 4 Drawn By:

6 LMB

LABEL 4

LABEL

D27 IN4004 R139 18k/2W

F
TO AC:1

5

LABEL 3

TO AC:4

THERM2
90C NORMALLY CLOSED THERMAL SWITCH

TO LT+2

R141 18K/1W
RLY3 (A) 2 LABEL RLY3 (B)

LABEL

R151 10K

BLUE

D30 IN4004

Q24 BF423

R66 47K

R65 47K R64

R62 100K

8

BLUE

E

RELAY2 Q46 BF422

RELAY1

Q45 2SA958

Q25 BF422 R150 120R R68 SEE NOTE R154 100K R67

D11 1N4148

47K R63 47K D7 IN4004 R61 4K7

RMOD1 100K

Q21 BF423

Q23 BF422

D8 D9 IN4004

IN4004 CON 5
LT +VE CH1

C46

C45 R152 10K Z12 5V6

DMOD IN4148

47K R69 24K 100uF C40 Q20 BF422 R149 100K Q22 BF422 D10 1N4148 C38 100UF/16V C37 680NF C39 100UF/16V

GND

100NF/ 250V

100NF/ 250V

1 2 3 4 5
LT +VE CH2

D

D12 IN4004

R148 39K

Z7 9V1

R70 18V

INTERCONNECT FLEXISTRIP TO DISPLAY

LABEL O/P1 LABEL O/P2

C R140 8K2 LABEL LEDBR

INTERCONNECT FLEXISTRIP 6 WAY

LED1 1 1 1
POWER RED

1

NOTE: RA1000/1 RA2000/1 RA3000/1 R68= 330R/5W 1K/5W 1K/5W
GREEN GREY YELLOW GREEN

B

6PIN 1 2 3 4 5 6

6PIN 1 2 3 4 5 6 LED2
PROTECT YELLOW

CH2

CH1

LED3
BRIDGE GREEN

Title Size
STATUS LED PCB

RA PROTECTION
Number
RAMAIN 5

A Revision
1

A3 Date: File:

1-Jul-1999 D:\PROTEL\RANEW\RAMAIN.S05

Sheet of 5 Drawn By:

6 LMB

LED1
TO CON: 5 LT +VE CH1 CH1 O/P GND CH2 O/P LT +VE CH2

1 2 3 4 5

C4 100NF

R14 510K Z13 11V R13 10K

SIGNAL PRESENT -40dB GREEN

R5 510K C1 100NF

LED8

SIGNAL PRESENT -40dB GREEN

F Z14 11V

R4 10K Q1 BF422 Q4 BF423 R2 10K

Q3 BF422 R11 10K D3 1N4148 C5 1uF

Q2 BF423

D1 1N4148

C2 1uF

E R1 Q9 BC214L

*

Q11 BC214L

R29 47K

R28 47K Q12 BC214L
YELLOW LED9 -20dB

R26 R12 100K D4 1N4148 R17 1K

*
R31 47R

Q10 BC214L

YELLOW LED2 -20dB

R3 100K D2

R32 47R

Z5 9v1 R18 56K 7 SIG IC2 LB1443N 1 2 3 4 9

Z6 8

LED3 -12dB

1N4148 R8 1K R9 56K

Z1 18V/1.3W IC3 LB1443N 1 7 SIG 9

Z9 9v1 Z10 6v8

LED10 -12dB

D

Z7 4v7

LED4 -7dB

LED11 2 3 4 Z11 4v7
-7dB

R16

*

C6 100NF

R19 56K

6

LED5 -4dB

6 Z12 2V7 LED12 -4dB

Z2 18V/1.3W

Z8 2V7

LED6 0dB

R7

*

C3 100NF

R10 56K

8

5

8

5

C LED13 0dB

Z3 Z4

*

*
D6

Q7 BF423 Q8 BF423 R22 100K 1N4148 C8 D5 1N4148

Q5 BF423

R25 100K RA4001 R1, R26 2K2/4W R7, R16 5K1 R27, R30 100K Z3, Z4 10V RA3001 R1, R26 3K3/4W R7, R16 6K8 R27, R30 (NOT FITTED) RA2001 R1, R26 3K3/4W R7, R16 8K2 R27, R30 (NOT FITTED) Z3, Z4 6V2 RA1001 R1, R26 2K2/4W R7, R16 13K R27, R30 (NOT FITTED Z3, Z4 7V5

Q6 BF423 C7 B

470PF R23 4K7/1W Z3, Z4 6V2 R27 ONLY FIT ON RA4001 C10 47UF/35V R24 100K R30 ONLY FIT ON RA4001

470PF R20 4K7/1W C9 47UF/35V R21 100K LED14
CLIP RED

LED7

CLIP RED

Title Size A3 Date: File:

RA DISPLAY CARD
Number
RA DISPLAY

A Revision
3 6 LMB

1-Jul-1999 Sheet of 6 D:\PROTEL\RANEW\NEWDISP.S01 Drawn By:

C4 100NF
TO CON: 5 LT +VE CH1 CH1 O/P GND CH2 O/P LT +VE CH2

R14 510K

LED1

SIGNAL PRESENT -40dB GREEN

C1 100NF

R5 510K

LED8

SIGNAL PRESENT -40dB GREEN

F 1 2 3 4 5

R13 10K Q3 BF422 R11 10K D3 1N4148 C5 470NF

R15 1K

R4 10K Q1 BF422

R6 1K

Q4 BF423

R2 10K D1 1N4148 C2 470NF

Q2 BF423

E

YELLOW -20dB

YELLOW

LED2 R12 100K D4 1N4148 R17 1K R18 56K 7 SIG P1 R16 C6 100NF R19 56K P2 P3 P4 IC2 U257 P0 6 8
-12dB

R3 100K R1 D2 R8 1K R9 56K 7 SIG P1 R7 C3 100NF R10 56K P2 P3 IC3 U257 P0 6 5 4 3 2 8

LED9

-20dB

R26

LED10

-12dB

LED3

1N4148

5 LED4 4 3 2

-7dB

LED11

-7dB

D

-4dB

P4

LED12

-4dB

LED5 1 1 LED6
0dB

Z2 20V/1.3W

Z1 20V/1.3W

LED13
0dB

C

Z4 Q7 BF423 D6 R25 100K 1N4148 C8 Q8 BF423 R22 100K D5 1N4148

Z3

Q5 BF423

Q6 BF423 C7 B

470PF R23 4K7/1W C10 47UF/35V RA3000 R1, R26 3K3/4W R7, R16 6K8 Z3, Z4 6V2 RA2000 R1, R26 3K3/4W R7, R16 8K2 Z3, Z4 6V2 RA1000 R1, R26 2K2/4W R7, R16 13K R24 100K

470PF R20 4K7/1W C9 47UF/35V R21 100K LED14
CLIP RED

LED7

CLIP RED

Title Size A3 Date: File:

RA DISPLAY CARD
Number
RA DISPLAY

A Revision
3

1-Jul-1999 D:\PROTEL\RANEW\RADISP.S06

Sheet of 6 Drawn By:

6 LMB

1

2

3

4

CON

R87 1k

CON

R3 5k6 D1 In4004 R1 8k2 R2 82k TR1 BC184L D16 10v

C3 6n8

R4 1k

D3 IN4148 CON

C1 6n8 D2 IN4004 R5 8k2 R6 82k

R7 1k

D4 IN4148 D17 10v TR2 BC214L R8 5k6 CON

Title CON CON Size A4 Date: File: 1 2 3 RE-ENTRANT PROTECT Number PCB1042/P1 22-Jul-1999 D:\PROTEL\RANEW\REENTRY.S01 Sheet of Drawn By: 4 1 1 L BASHAM ION PCB Revision

Protection System The protection system is based around Q20-Q25. Under normal conditions Q20 ­ Q23 will be off. At turn-on C40 will charge through R65 towards the +LT supply rail. The voltage is fed to the base of Q25 via D11. When the voltage across C40 reaches approximately 10V Q25 will turn on and thus turn on Q24. Resistor/diode network R67 & D38 connected between Q24 collector and Q25 base provides positive feedback in order to make the turn-on/turn-off of Q24 more defined. The collector of Q24 is connected via R68 R150 & Q45 to the coils of relays RLY1-3. Transistors Q20 and Q21 are connected in such a way that a voltage of -650mV applied to the emitter of Q20 will turn on Q20 and hence Q21. This will rapidly discharge C40 and hence turn off Q25 and Q24 thus opening the output relays. Similarly Q23 is connected such that a base voltage of +650mV will turn it, and hence Q22, on with the same resultant opening of the output relays. The output of each channel is fed via resistors R63 and R64 into C38-C39 and then via D9 and D10 to Q23 base and Q20 emitter respectively. The combination of C38-C39 with R63 and R64 forms a low-pass filter, and so at signal frequencies C38-C39 will have no voltage across it. In the event of a DC offset appearing at the output, however, C38-C39 will charge to a DC voltage, turning on Q23 & Q22 or Q20 & Q21 depending upon the polarity, and hence opening the output relays. The Network consisting of R62, R61 and C37 provide the rapid turn-off feature of the protection system. R61 is connected through the 90 degree thermal switch to D37 and D7, which are connected to the secondaries of the mains transformer. The union of D37 and D7 will, therefore, show a full-wave rectified version of the secondary voltage. This is averaged by C37 to a negative DC voltage, reverse biasing D8 and, therefore, having no effect on the protection system. Should one of the thermal switches open, or the power be turned off, C37 will be rapidly charged towards the +LT rail via R61, forward biasing D8, turning Q23 on and opening the output relays. If there is no rapid turn off, suspect R62 (100k) this may be open circuit. It is worth noting that failure of this resistor will render the thermal shutdown useless.