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Northridge E250P/230
Service Manual
Amplifier
Power (RMS): Driver: Inputs: 250 Watts 300mm (12") PolyPlas Line Level (switchable to LFE) and Speaker Level with 5-way binding posts Speaker Level, High-Pass 5-way binding posts
Outputs:
Low-Pass
Frequency: Continuously variable from 50Hz 150Hz
High-Pass
Frequency: 150Hz when using speaker-level output
Frequency
Response: 25Hz low-pass crossover setting
Dimensions
(H x W x D): Weight: 500mm x 365mm x 435mm 20.1kg
14,15,16 2,3
7 11 1
24
17
19 9 23 6,20 21 12 10 18 8,13 1
4 5
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Model E250PBLK/BE/CH E250P/230 E250PBE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250P/230 E250PBE/230 E250PCH/230 E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH E250PBLK/BE/CH Part number 315953-001 333249-001 333249-003 336486-001 336799-001 338125-002 338128-002 338381-001 338836-001 350161-001 351243-001 351245-002 351248-001 351249-004 351249-005 351249-006 351252-001 351252-002 351307-001 351348-001 49790P 763-31110-40 903401-012 903802-016 908302-012 Description BAG,ZIPLOCK,9X12 CUP,GRL-HLS CUP,GRL-INTRMZO
Qty 1,0000 4,0000 4,0000 4,0000 1,0000 1,0000 1,0000 1,0000 2,0000 1,0000 1,0000 1,0000 1,0000 1,0000 1,0000 1,0000 1,0000 1,0000 1,0000 1,0000 4,0000 4,0000 10,0000 8,0000 4,0000
FT,MOLDED,W/RBR INSRT ASY,PTB-STUDIO PB12 ASY,LED-E150P/E250P ASY,XDUCER,WFR,12", E WARR,JBL,1YR/5YR,NEW LBL, COUNTRY OF ORIGI LBL,JBL"Assem. in Mex RING,TRIM,12"-E250P ASY,AMP-E250P/230V MNL,OWNER-E150P/E250P CTN,OUTER,MSTR-E250P/ CTN,OUTER,MSTR-E250BE CTN,OUTER,MSTR-E250CH PAD,END,TOP-E250P SER PAD,END,BTM-E250P SER ASY,GRL,FRNT-E250P ASY,LOGO/LEDPLATE MICROFOAM,.062x20x18" SCR,#8X2.5,TR HD, PH SCR,PB,PPH,#6x.75,BLK SCR,PB,HXS,#8x1,ZINC SCR,PB,HXS,#6x.75,ZIN
E250P
Electrical Parts List
Part Number Resistors 020-220497-120 021-100401-120 021-120403-020 021-120405-020 022-500003-020 024-000098-120 024-100298-120 024-100398-120 024-100498-120 024-100598-120 Film Resistor MOF Resistor MOF Resistor MOF Resistor KNP Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor 2K2 1/4W J 1K 1W J 1K2 3WS J 1K2 5WS J 0 ohms05 3WS J 0 ohms 1/8W J 10 ohms 1/8W J 100 ohms 1/8W J 1K 1/8W J 10K 1/8W J 1 1 1 1 1 2 2 1 10 30 R11 R103 R9 R6 R104 R125, 126 R81, 82 R62 R79, 83, 92, 95, 96, 105, 108, 127, 65 R2, 17, 19, 20, 21, 37, 54, 58, 63, 69, 71, 72, 74, 75, 84, 88, 89, 97, 106, 109, 111, 113-117, 119, 120, 123, 124 R3, 22-25, 112 R98 R39 R38 R32 R67, 68 R29 R45 R94 R90 R1, 87, 61 R118 R80, 121 R48 R36 R73, 64 R55 R56 R7, 8, 26, 27, 12-15, 59 R4, 5 R28 R93 R77 R78 R30 R101, 102 R76, 99, 100 R85, 86 R44, 47, 49, 107 R70 R60 R51, 53 R57 R122 R16, 18 R46, 91, 40, 41, 43, 42 R33, 34, 31, 50, 52, 66 R69 VR2 VR1 Description Qty Reference designators
024-100698-120 024-110598-100 024-120698-120 024-121598-100 024-137698-100 024-150498-120 024-180598-120 024-187698-100 024-200598-120 024-220398-120 024-220498-121 024-220598-120 024-220798-120 024-237598-120 024-243698-100 024-270498-120 024-300398-120 024-300598-120 024-330498-120 024-330598-120 024-360498-120 024-390498-120 024-390598-120 024-430498-100 024-453598-100 024-470298-120 024-470398-120 024-470498-120 024-470598-120 024-470698-120 024-470798-120 024-487498-100 024-510398-120 024-560598-120 024-620398-100 024-680498-120 024-680598-120 024-820598-120 026-200595-269 026-500495-252
SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor VR2 FREQUENCY POT VR1 LEVEL POT
100K 1/8W J 11K 1/8W F 120K 1/8W J 12K1 1/8W F 137K 1/8W F 1K5 1/8W J 18K 1/8W J 187K 1/8W F 20K 1/8W J 220 ohms 1/8W J 2K2 1/8W J 22K 1/8W J 2M2 1/8W J 23K7 1/8W F 243K 1/8W F 2K7 1/8W J 300 ohms 1/8W J 30K 1/8W J 3K3 1/8W J 33K 1/8W J 3K6 1/8W J 3K9 1/8W J 39K 1/8W J 4K3 1/8W F 45K3 1/8W F 47 ohms 1/8W J 470 ohms 1/8W J 4K7 1/8W J 47K 1/8W J 470K 1/8W J 4.7M 1/8W J 4K87 1/8W F 510 ohms 1/8W J 56K 1/8W J 620 ohms 1/8W F 6.8K 1/8W J 68K 1/8W J 82K 1/8W J PN:RD163121R034-20KBx2(EJ) P/N:RK163111R522-5KA (EJ)
6 1 1 1 1 2 1 1 1 1 3 1 2 1 1 2 1 1 9 2 1 1 1 1 1 2 3 2 4 1 1 2 1 1 2 6 6 1 1 1
38
PB12
PB12 Electrical Parts List (Cont.) Revision 2 Only
Part Number Capacitors 031-100244-100 031-100343-100 031-100344-100 031-100364-100 031-220344-100 031-330444-300 031-470244-102 031-560243-100 031-560343-102 032-100484-200 033-200645-300 033-470444-270 033-680464-270 034-100525-300 034-100625-300 034-220525-301 034-220615-301 034-330525-300 034-330615-300 034-330780-300 034-470415-301 034-470615-301 038-100363-300 038-150393-300 038-330393-300 039-100390-100 Semiconductors 051-000600-100 051-005600-100 051-222200-100 051-290700-100 051-540101-000 051-555100-000 052-400080-000 053-211100-000 054-000100-100 054-001001-100 054-001500-100 054-007200-100 054-007400-100 054-033904-100 054-033906-100 054-045580-100 054-050600-100 054-211400-100 054-414803-100 054-540100-100 054-555100-100 051-003100-000 051-064000-000 NPN Transistor NPN Transistor NPN Transistor NPN Transistor PNP Transistor NPN Transistor Bridge rectifier IC;Half-Bridge Driver SMD Diode SMD Zener Diode SMD Zener Diode SMD IC Dual Op-Amp SMD IC Quad Op-Amp SMD TR NPN (MOTOROLA) SMD TR PNP (MOTOROLA) SMD Dual Op-Amp SMD Zener Diode SMD NPN Transistor SMD Zener Diode SMD PNP Transistor SMD NPN Transistor NPN Transistor MOSFET MPSW06RLRA MPSW56RLRA MPQ TO-92 PN:MPS2222ARLRA TO-92 P2N2907A TO-92 2N5401 TO-92 2N5551 TO-92 PN:RS804 400V, 8A PN:IR2111 ES1D 200V, 1A, 35ns 10V SOT-23 DZ23C10 15V SOT-23 DZ23C15 TL072CDR SO-8 (TI) PN:TL074CDR (TI) MMBT3904LT1 SOT23 MMBT3906LT1 SOT23 NJM4558M-TE3 DMP-8 5.6V SOT-23 DZ23C5V6 DTC114EK SMT3 LL4148 MMBT5401 LT1 MMBT5551 LT1 TIP31C TO-220 IRF640 TO-220 2 1 1 2 1 1 1 1 5 1 3 2 2 6 4 1 3 1 26 3 1 1 2 Q2, Q16 Q3 Q21 Q19, 23 Q1 Q17 BR1 U7 D5, 26, 29, 33, 38 D35 D6, 7, 9 U5, 6 U2, 3 Q11, 14, 13, 5, 8, 9 Q6, 10, 12, 15 U4 D24, 36, 37 Q7 D1-4, 8, 10-23, 27, 28, 30-32, 34, 39 Q20, 24, 26 Q25 Q4 Q18, 22 SMD Ceramic Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor END PE Capacitor NP Capacitor NPE NPE Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor MPE Capacitor MPE Capacitor MPE Capacitor UL Capacitor 0u01/50V K 100pF/50V J 0u1/50V K 0.1uF/100V K 220pF/50V J 3300pF/50V K 0u047/50V K 56pF/50V J 560pF/50V J 1uF/250V K 200u/50V M 4u7/50V K 6u8/100V K 10uF/25V M 100uF/25V M 22uF/25V M 220uF/16V M 33uF/25V M 330uF/16V M 3300uF/80V M 4u7/50V M 470uF/16V M 0u1/100V J 0u15/63V J 0u33/63V J 0u1/275V 7 3 16 2 5 2 2 2 1 2 2 1 1 1 1 6 1 1 2 2 1 1 7 1 1 1 C33, 45, 51, 66, 67, 5, 10 C16, 36, 58 C11, 42-44, 46-49, 52, 54, 55, 60, 63, 71, 74, 77 C3, 7 C14, 15, 20, 21, 19 C40, 34 C62, 59 C57, 61 C56 C70, C70B C17, 18 C73 C72 C35 C64 C4, 9, 41, 39, 50, 53 C37 C1 C12, 78 C6, 8 C2 C65 C68, 69, 26, 27, 28, 29, 30 C25 C31 CXAC1 Description Qty Reference designators
39
E250P
Electrical Parts List
Part Number Miscellaneous 041-115001-000 043-300101-000 043-324300-000 043-560200-000 043-700101-000 044-100100-000 072-010007-000 072-040039-000 072-040064-000 072-040096-000 072-040169-000 072-060170-000 XXX-XXXXX-XXX 073-050001-000 074-030002-000 074-300018-000 XXX-XXXXX-XXX 061-020000-000 061-314002-000 063-010012-000 063-531808-000 073-032315-601 074-020018-000 XXX-XXXXX-XXX 181-911600-161 181-911655-135 181-921600-000 181-921699-000 Bead Coil Inductor Inductor Inductor Toroidal Inductor SMD Ferrite Bead RCA Housing Terminal Terminal Terminal YT-10911 30uH YT-10033 324uH YT-10778 56uH YT-10779 70uH YT-10682 600R/100MHz 1206 SCJ-1020 2P(G) WHT, RED PC205 (t=0.8m/m) T205MA PC250(t=0.8), T250MA (t=0.8mm) PC187(0.8) 1 1 1 1 1 2 1 1 1 7 1 4 1 2 2 1 1 2 2 4 1 1 1 1 1 1 1 1 L5 L2 L3 FB1, FB2 CONN1 SS+ AC1, AC3, T1, T2, AC2, SW2, SW4 CONN3A BP/IP, BP/OP SW5, SW6 K1 Description Qty Reference designators
Connector 2 PIN JS-1001-2 P:2.5mm Binding Posts HI LEVEL Input/Output Jacks Fuse 250V, 5*20mm FUSE CLIP P/N:CFFH1206 Toggle SW P/N L101 Relay PN:943-1C-48D Power Transformer 230V Level-Volume Knob 20 x 15 m/m UL 94V-0 Blk Strain relief SB4F-2 Clamps for output transistors TRK-1 Rear plastic cover w/G ABS Heatsink 70 x 58 x 20 mm Main Power switch RF1003-BB4-0 Power Cord 230V SPT-2 BLK Output wires #16 AWG UL1007 Blk Output wires #16 AWG UL1007 Green Output wires #16 AWG UL1015 Blk Output wires #16 AWG UL1015 Wht
E250P
Testing Procedure
A. Power Amp Section Resistance Check
Resistance from S+ (SPK O/P) to GND should be >1M (NO LOAD) Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k Resistance from V+ (C6 P+) to S+ (SPK O/P) should read >1M Resistance from V- (C8 P-) to S+ (SPK O/P) should read >1M
2. Power Up LED RED With a 5mV signal to Low level input, LED should change to GREEN -Voltage measurements (DVM) OP AMP P-U4(1) P-U4(7) 0Vrms 11.84VDC 7.13Vrms -12.93VDC
LED RED GREEN 3. D.C. Operation
-Voltage measurements (DVM) on CLASS D POWER AMP
Between And This Point Get this Reading V+ GND 71.7V Q4(E) V0V Q1(C) GND -71.7V
Q10(C)
U7(1) GND -71.7V
U7(2) GND -71.5V
U7(4) GND -71.2V
U7(6) GND 0V
U7(7) GND 0V
U7(8) GND 4.65V
GND 0V
4. Check Switching Frequency · · Oscilloscope - USE THE PROBE TIP TO U6(7) TO GND Reading 100kHz +/-10%,24Vp-p
B. Pre Amp Section Line Level Input Sensitivity -Set up Turn level, X'OVER FREQ POT Fully CW and LFE switch off Generator Set at 200mV@50Hz Signal to Line level input
E250P
Testing Procedure
- Voltage measurements OP AMP U3(1)
628mV
U2(1)
306.9mV
U2(14)
461mV
U2(8)
460mV
U3(7)
658mV
U3(14)
598mV
U3(8)
2.326V
U5(7)
2.02V
U5(1)
3.57V
SPEAKER O/P
23.33V
2. High Level Input Sensitivity -Set up Turn level, X'OVER FREQ POT Fully CW and LFE switch off Set Generator at 1.3V@50Hz Signal to High level input -Voltage measurements 15.3V at speaker output 3. Low-Pass -Set up Set Generator at 200 mV@100Hz Signal to Line level input Measure voltage at S+ speaker output
-Voltage measurement X'OVER FREQ. Setting CW CCW 4. LFE -Set up Set Generator at 200mV@200Hz Signal to Line level input Measure voltage at S+ speaker output Output 6V 18.32V Output 14.03V 4.8V
LFE switch Setting Normal LFE
See flow chart next page for diagnostics.
E250P
Testing Procedure
POWER MODULE TESTING FLOW CHART
CAUTION : SPEAKER OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT TO GROUND. ALL TEST INSTRUMENTS CONNECTED TO THE OUTPUT MUST BE FLOATING. ATTACH THE SCOPE PROBE TIP TO S - and REFERENCE LEAD TO S+.
(A 10mV signal may need from the input to trigger the Switch turn on) START
Resistance check (no load) between V+ V-, V+ O/P,V- O/P and O/P to GND is > 10K
Check +/-15V-MOD +/-15V voltage at U 6(8),U6(4) Check FB1,FB2,C45, C50,C60,C63, R81,R82
no no
OK
Replace Q18,Q22
OK
yes yes
Power up with no signal input LED RED I/P:10mv/50HZ Check +15V/SW Q4(E) TO V 15V
no no
OK
yes
Check Q4(E) TO V = 0V D.C.
Discharge C37, Check fuse transformer, L4, rectifier, C6 and C8
Check
OK MUTE(-12.9V),
yes Check U7(1) = -58.3V
And Q24,Q25,Q26
no no
OK
Check MUTE(+8V) and Q24,Q25,Q26
OK
yes Use scope to check O/P U7(6) and GND 143Vp-p square wave shown
Check U7,Q16,Q17, Q20,Q21,R87, D26,D35,C64
yes Use scope to check switching frequency U6(7) 100KHz +/-10% , ~24Vp-p
no
OK
no
OK
yes yes Check L2,L3,C71,C72, C73,C74
CLASS D AMP OK END
Block Diagram
1 2 3 4 5
RevNo Revision note
6
7
Date
8
Signature Checked
A
SPEAKER LEVEL INPUT PHASE CTRL SWITCH
A
Rin
VOLUME CTRL
Lin
DIF. AMP
SUMMI NG AMP
AMP STAGE HPF LPF 12dB/Octave LPF Variable 12dB/Octave
B
Rout Lout Line Level Input
DC OFFSET PROTECTION
12dB/Octave
B
LFE LIMITER / LPF SUMMI NG AMP
NORMAL
C
SIGNAL SENSE THERMAL PROTECTION MUTE
C
SIGNAL SENEING
ATO
CURRENT PROTECTION
MUTE
D
* FUSE
LINEAR POWER SUPPLY CLASS D AMPLIFIER OUTPUT-RELAY
D
5.6 OHMS EXTERNAL LED INDICATORS +15V SW CONTROLLED REGULATOR
E
E
MUTE
F
NOTE : 120 VAC T2A-250V 230 VAC T1.25A-250V
F
1
2
3
6
7
8
Schematic Diagrams
PREAMP
Schematic Diagrams
POWER AMP
E250P
Integrated Circuit Diagrams
2N5401 Q1
3 Collector 2 Base
1. G 2. D 3. S
OPAMP, QUAD TL074CDR U2, 3
MOSFET IRF640 Q18, 22
1
1 Emitter
2 3
MPSW06RLRA, MPSW56RLRAMPQ, MPS2222ARLRA, 2N2907A, 2N5551, Q2, 16, 3, 21, 19, 23, 17
3 Collector 2 Base
1
2
3
OPAMP, DUAL TL072CDR SO-8, NJM4558M-TE3 U5, 6, 4
TIP31C Q4
1
1 Emitter
2 3
BEVEL
MMBT3904LTI SOT23, MMBT3906LTI SOT23, DTC114EK SMT3, MMBT5401 LTI, MMBT5551 LTI Q11, 14, 13, 5, 8, 9, 6, 10, 12, 15, 7, 20, 24, 26, 25
B
C
E
IR2111 HALF-BRIDGE DRIVER U7