Northridge E250P User manual

Amplifier
250 Watts
High-Pass
Frequency
Dimensions
20.1kg
Service Manual
Northridge E250P/230
Power (RMS):
Driver: 300mm (12") PolyPlas
Inputs: Line Level (switchable to LFE)
and Speaker Level with
5-way binding posts
Outputs: Speaker Level, High-Pass
5-way binding posts
Low-Pass
Frequency: Continuously variable
from 50Hz – 150Hz
Frequency: 150Hz when using
speaker-level output
Response: 25Hz – low-pass
crossover setting
(H x W x D): 500mm x 365mm x 435mm
Weight:

1
4
5
6,20
7
8,13
9
10
14,15,16
17
18
11
2,3
1
12
21
19
23
24
Item Model Part number Description Qty
1 E250PBLK/BE/CH 315953-001 BAG,ZIPLOCK,9X12 1,0000
2 E250P/230 333249-001 CUP,GRL-HLS 4,0000
3 E250PBE/CH 333249-003 CUP,GRL-INTRMZO 4,0000
4 E250PBLK/BE/CH 336486-001 FT,MOLDED,W/RBR INSRT 4,0000
5 E250PBLK/BE/CH 336799-001 ASY,PTB-STUDIO PB12 1,0000
6 E250PBLK/BE/CH 338125-002 ASY,LED-E150P/E250P 1,0000
7 E250PBLK/BE/CH 338128-002 ASY,XDUCER,WFR,12", E 1,0000
8 E250PBLK/BE/CH 338381-001 WARR,JBL,1YR/5YR,NEW 1,0000
9 E250PBLK/BE/CH 338836-001 LBL, COUNTRY OF ORIGI 2,0000
10 E250PBLK/BE/CH 350161-001 LBL,JBL"Assem. in Mex 1,0000
11 E250PBLK/BE/CH 351243-001 RING,TRIM,12"-E250P 1,0000
12 E250PBLK/BE/CH 351245-002 ASY,AMP-E250P/230V 1,0000
13 E250PBLK/BE/CH 351248-001 MNL,OWNER-E150P/E250P 1,0000
14 E250P/230 351249-004 CTN,OUTER,MSTR-E250P/ 1,0000
15 E250PBE/230 351249-005 CTN,OUTER,MSTR-E250BE 1,0000
16 E250PCH/230 351249-006 CTN,OUTER,MSTR-E250CH 1,0000
17 E250PBLK/BE/CH 351252-001 PAD,END,TOP-E250P SER 1,0000
18 E250PBLK/BE/CH 351252-002 PAD,END,BTM-E250P SER 1,0000
19 E250PBLK/BE/CH 351307-001 ASY,GRL,FRNT-E250P 1,0000
20 E250PBLK/BE/CH 351348-001 ASY,LOGO/LEDPLATE 1,0000
21 E250PBLK/BE/CH 49790P MICROFOAM,.062x20x18" 4,0000
22 E250PBLK/BE/CH 763-31110-40 SCR,#8X2.5,TR HD, PH 4,0000
23 E250PBLK/BE/CH 903401-012 SCR,PB,PPH,#6x.75,BLK 10,0000
24 E250PBLK/BE/CH 903802-016 SCR,PB,HXS,#8x1,ZINC 8,0000
25 E250PBLK/BE/CH 908302-012 SCR,PB,HXS,#6x.75,ZIN 4,0000

E250P
Electrical Parts List
Part Number Description Qty Reference designators
Resistors
020-220497-120
Film Resistor 2K2 1/4W J 1 R11
021-100401-120 MOF Resistor 1K 1W J 1 R103
021-120403-020 MOF Resistor 1K2 3WS J 1 R9
021-120405-020 MOF Resistor 1K2 5WS J 1 R6
022-500003-020 KNP Resistor 0 ohms05 3WS J 1 R104
024-000098-120 SMD Resistor 0 ohms 1/8W J 2 R125, 126
024-100298-120 SMD Resistor 10 ohms 1/8W J 2 R81, 82
024-100398-120 SMD Resistor 100 ohms 1/8W J 1 R62
024-100498-120 SMD Resistor 1K 1/8W J 10 R79, 83, 92, 95, 96, 105,
108, 127, 65
024-100598-120 SMD Resistor 10K 1/8W J 30 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
024-100698-120 SMD Resistor 100K 1/8W J 6 R3, 22-25, 112
024-110598-100 SMD Resistor 11K 1/8W F 1 R98
024-120698-120 SMD Resistor 120K 1/8W J 1 R39
024-121598-100 SMD Resistor 12K1 1/8W F 1 R38
024-137698-100 SMD Resistor 137K 1/8W F 1 R32
024-150498-120 SMD Resistor 1K5 1/8W J 2 R67, 68
024-180598-120 SMD Resistor 18K 1/8W J 1 R29
024-187698-100 SMD Resistor 187K 1/8W F 1 R45
024-200598-120 SMD Resistor 20K 1/8W J 1 R94
024-220398-120 SMD Resistor 220 ohms 1/8W J 1 R90
024-220498-121 SMD Resistor 2K2 1/8W J 3 R1, 87, 61
024-220598-120 SMD Resistor 22K 1/8W J 1 R118
024-220798-120 SMD Resistor 2M2 1/8W J 2 R80, 121
024-237598-120 SMD Resistor 23K7 1/8W F 1 R48
024-243698-100 SMD Resistor 243K 1/8W F 1 R36
024-270498-120 SMD Resistor 2K7 1/8W J 2 R73, 64
024-300398-120 SMD Resistor 300 ohms 1/8W J 1 R55
024-300598-120 SMD Resistor 30K 1/8W J 1 R56
024-330498-120 SMD Resistor 3K3 1/8W J 9 R7, 8, 26, 27, 12-15, 59
024-330598-120 SMD Resistor 33K 1/8W J 2 R4, 5
024-360498-120 SMD Resistor 3K6 1/8W J 1 R28
024-390498-120 SMD Resistor 3K9 1/8W J 1 R93
024-390598-120 SMD Resistor 39K 1/8W J 1 R77
024-430498-100 SMD Resistor 4K3 1/8W F 1 R78
024-453598-100 SMD Resistor 45K3 1/8W F 1 R30
024-470298-120 SMD Resistor 47 ohms 1/8W J 2 R101, 102
024-470398-120 SMD Resistor 470 ohms 1/8W J 3 R76, 99, 100
024-470498-120 SMD Resistor 4K7 1/8W J 2 R85, 86
024-470598-120 SMD Resistor 47K 1/8W J 4 R44, 47, 49, 107
024-470698-120 SMD Resistor 470K 1/8W J 1 R70
024-470798-120 SMD Resistor 4.7M 1/8W J 1 R60
024-487498-100 SMD Resistor 4K87 1/8W F 2 R51, 53
024-510398-120 SMD Resistor 510 ohms 1/8W J 1 R57
024-560598-120 SMD Resistor 56K 1/8W J 1 R122
024-620398-100 SMD Resistor 620 ohms 1/8W F 2 R16, 18
024-680498-120 SMD Resistor 6.8K 1/8W J 6 R46, 91, 40, 41, 43, 42
024-680598-120 SMD Resistor 68K 1/8W J 6 R33, 34, 31, 50, 52, 66
024-820598-120 SMD Resistor 82K 1/8W J 1 R69
026-200595-269 VR2 FREQUENCY POT PN:RD163121R034-20KBx2(EJ) 1 VR2
026-500495-252 VR1 LEVEL POT P/N:RK163111R522-5KA (EJ) 1 VR1
38

PB12
PB12 Electrical Parts List (Cont.)
Revision 2 Only
Part Number Description Qty Reference designators
Capacitors
031-100244-100
SMD Ceramic Capacitor 0u01/50V K 7 C33, 45, 51, 66, 67, 5, 10
031-100343-100 SMD Capacitor 100pF/50V J 3 C16, 36, 58
031-100344-100 SMD Capacitor 0u1/50V K 16 C11, 42-44, 46-49, 52, 54, 55,
60, 63, 71, 74, 77
031-100364-100 SMD Capacitor 0.1uF/100V K 2 C3, 7
031-220344-100 SMD Capacitor 220pF/50V J 5 C14, 15, 20, 21, 19
031-330444-300 SMD Capacitor 3300pF/50V K 2 C40, 34
031-470244-102 SMD Capacitor 0u047/50V K 2 C62, 59
031-560243-100 SMD Capacitor 56pF/50V J 2 C57, 61
031-560343-102 SMD Capacitor 560pF/50V J 1 C56
032-100484-200 END PE Capacitor 1uF/250V K 2 C70, C70B
033-200645-300 NP Capacitor 200u/50V M 2 C17, 18
033-470444-270 NPE 4u7/50V K 1 C73
033-680464-270 NPE 6u8/100V K 1 C72
034-100525-300 Electrolytic Capacitor 10uF/25V M 1 C35
034-100625-300 Electrolytic Capacitor 100uF/25V M 1 C64
034-220525-301 Electrolytic Capacitor 22uF/25V M 6 C4, 9, 41, 39, 50, 53
034-220615-301 Electrolytic Capacitor 220uF/16V M 1 C37
034-330525-300 Electrolytic Capacitor 33uF/25V M 1 C1
034-330615-300 Electrolytic Capacitor 330uF/16V M 2 C12, 78
034-330780-300 Electrolytic Capacitor 3300uF/80V M 2 C6, 8
034-470415-301 Electrolytic Capacitor 4u7/50V M 1 C2
034-470615-301 Electrolytic Capacitor 470uF/16V M 1 C65
038-100363-300 MPE Capacitor 0u1/100V J 7 C68, 69, 26, 27, 28, 29, 30
038-150393-300 MPE Capacitor 0u15/63V J 1 C25
038-330393-300 MPE Capacitor 0u33/63V J 1 C31
039-100390-100 UL Capacitor 0u1/275V 1 CXAC1
Semiconductors
051-000600-100
NPN Transistor MPSW06RLRA 2 Q2, Q16
051-005600-100 NPN Transistor MPSW56RLRA MPQ TO-92 1 Q3
051-222200-100 NPN Transistor PN:MPS2222ARLRA TO-92 1 Q21
051-290700-100 NPN Transistor P2N2907A TO-92 2 Q19, 23
051-540101-000 PNP Transistor 2N5401 TO-92 1 Q1
051-555100-000 NPN Transistor 2N5551 TO-92 1 Q17
052-400080-000 Bridge rectifier PN:RS804 400V, 8A 1 BR1
053-211100-000 IC;Half-Bridge Driver PN:IR2111 1 U7
054-000100-100 SMD Diode ES1D 200V, 1A, 35ns 5 D5, 26, 29, 33, 38
054-001001-100 SMD Zener Diode 10V SOT-23 DZ23C10 1 D35
054-001500-100 SMD Zener Diode 15V SOT-23 DZ23C15 3 D6, 7, 9
054-007200-100 SMD IC Dual Op-Amp TL072CDR SO-8 (TI) 2 U5, 6
054-007400-100 SMD IC Quad Op-Amp PN:TL074CDR (TI) 2 U2, 3
054-033904-100 SMD TR NPN (MOTOROLA) MMBT3904LT1 SOT23 6 Q11, 14, 13, 5, 8, 9
054-033906-100 SMD TR PNP (MOTOROLA) MMBT3906LT1 SOT23 4 Q6, 10, 12, 15
054-045580-100 SMD Dual Op-Amp NJM4558M-TE3 DMP-8 1 U4
054-050600-100 SMD Zener Diode 5.6V SOT-23 DZ23C5V6 3 D24, 36, 37
054-211400-100 SMD NPN Transistor DTC114EK SMT3 1 Q7
054-414803-100 SMD Zener Diode LL4148 26 D1-4, 8, 10-23, 27, 28, 30-32,
34, 39
054-540100-100 SMD PNP Transistor MMBT5401 LT1 3 Q20, 24, 26
054-555100-100 SMD NPN Transistor MMBT5551 LT1 1 Q25
051-003100-000 NPN Transistor TIP31C TO-220 1 Q4
051-064000-000 MOSFET IRF640 TO-220 2 Q18, 22
39

E250P
Electrical Parts List
Part Number Description Qty Reference designators
Miscellaneous
041-115001-000
Bead Coil YT-10911 1 L5
043-300101-000 Inductor 30uH YT-10033 1 L2
043-324300-000 Inductor 324uH YT-10778 1
043-560200-000 Inductor 56uH YT-10779 1
043-700101-000 Toroidal Inductor 70uH YT-10682 1 L3
044-100100-000 SMD Ferrite Bead 600R/100MHz 1206 2 FB1, FB2
072-010007-000 RCA Housing SCJ-1020 2P(G) WHT, RED 1 CONN1
072-040039-000 Terminal PC205 (t=0.8m/m) T205MA 1 S-
072-040064-000 Terminal PC250(t=0.8), T250MA 1 S+
072-040096-000 Terminal (t=0.8mm) PC187(0.8) 7 AC1, AC3, T1, T2, AC2,
SW2, SW4
072-040169-000 Connector 2 PIN JS-1001-2 P:2.5mm 1 CONN3A
072-060170-000 Binding Posts HI LEVEL Input/Output Jacks 4 BP/IP, BP/OP
XXX-XXXXX-XXX Fuse 250V, 5*20mm 1
073-050001-000 FUSE CLIP P/N:CFFH1206 2
074-030002-000 Toggle SW P/N L101 2 SW5, SW6
074-300018-000 Relay PN:943-1C-48D 1 K1
XXX-XXXXX-XXX Power Transformer 230V 1
061-020000-000 Level-Volume Knob 20 x 15 m/m UL 94V-0 Blk 2
061-314002-000 Strain relief SB4F-2 2
063-010012-000 Clamps for output transistorsTRK-1 4
063-531808-000 Rear plastic cover w/G ABS 1
073-032315-601 Heatsink 70 x 58 x 20 mm 1
074-020018-000 Main Power switch RF1003-BB4-0 1
XXX-XXXXX-XXX Power Cord 230V SPT-2 BLK 1
181-911600-161 Output wires #16 AWG UL1007 Blk 1
181-911655-135 Output wires #16 AWG UL1007 Green 1
181-921600-000 Output wires #16 AWG UL1015 Blk 1
181-921699-000 Output wires #16 AWG UL1015 Wht 1

E250P
Testing Procedure
A. Power Amp Section
Resistance
Check Resistance from S+ (SPK O/P) to GND should be >1M Ω(NO LOAD)
Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k Ω
Resistance from V+ (C6 P+) to S+ (SPK O/P) should read >1MΩ
Resistance from V- (C8 P-) to S+ (SPK O/P) should read >1M Ω
2. Power Up LED RED
With a 5mV signal to Low level input, LED should change to GREEN
-Voltage measurements (DVM)
LED
OP AMP
P-U4(1) P-U4(7)
RED 0Vrms 11.84VDC
GREEN 7.13Vrms -12.93VDC
3. D.C. Operation
-Voltage measurements (DVM) on CLASS D POWER AMP
Between V+ Q4(E) Q1(C) Q10(C) U7(1) U7(2) U7(4) U7(6) U7(7) U7(8)
And This
Point GND V- GND GND GND GND GND GND GND GND
Get this
Reading 71.7V 0V -71.7V 0V -71.7V -71.5V -71.2V 0V 0V 4.65V
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 SPEAKER
O/P
U2(1) U2(14) U2(8) U3(7) U3(1) U3(14) U3(8) U5(7) U5(1)
306.9mV 461mV 460mV 658mV 628mV 598mV 2.326V 2.02V 3.57V 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 Output
CW 14.03V
CCW 4.8V
4. LFE
-Set up Set Generator at 200mV@200Hz
Signal to Line level input
Measure voltage at S+ speaker output
LFE switch Setting Output
Normal 6V
LFE 18.32V
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+.
START (A 10mV signal may need from the input to trigger theSwitch turn on)
no
no
yes
yes
no
no
yes
yes
no
no
yes
yes
no
no
yes
yes
Check +/-15V-MOD
+/-15V voltage at
U 6(8),U6(4)
Discharge C37,
Check fuse
transformer, L4,
rectifier, C6 and C8
Use scope to check
switching
frequency U6(7)
100KHz
+/-10% , ~24Vp-p
Check Q4(E)
TO V-
= 0V D.C.
Power up with no
signal input
LED RED
OK
OK
OK
OK
OK
OK
OK
OK
Check
MUTE(+8V) and
Q24,Q25,Q26
Use scope to
check O/P U7(6)
and GND
143Vp-p square
wave shown
Check
L2,L3,C71,C72,
C73
,
C74
I/P:10mv/50HZ
Check +15V/SW
Q4(E) TO V-
15V
Replace
Q18,Q22
CLASS D AMP OK
END
Check
U7,Q16,Q17,
Q20,Q21,R87,
D26,D35,C64
Check
FB1,FB2,C45,
C50,C60,C63,
R81,R82
Check
U7(1) = -58.3V
Check
MUTE(-12.9V),
And
Q24,Q25,Q26
Resistance check
(no load)
between V+ V-,
V+ O/P,V- O/P
and O/P to GND
is > 10K

Block Diagram
Rin
Lin
Rout
Lout
Line Level
Input
DIF. AMP SUMMI NG AMP
VOLUME CTRL
PHASE CTRL
SWITCH
AMP STAGE
12dB/Octave
HPF LPF
12dB/Octave 12dB/Octave
LPF
Variable
SUMMI NG AMP
LIMITER /
LPF
MUTE
DC OFFSET
PROTECTION
THERMAL
PROTECTION
CURRENT
PROTECTION
LINEAR
POWER SUPPLY
* FUSE
MUTE
SIGNAL SENSE
ATO
SIGNAL SENEING
EXTERNAL LED INDICATORS
CONTROLLED
REGULATOR
CLASS D
AMPLIFIER
+15V SW
MUTE
OUTPUT-RELAY
5.6 OHMS
LFE
NORMAL
NOTE :
120 VAC T2A-250V
230 VAC T1.25A-250V
SPEAKER LEVEL
INPUT
F
1
E
D
3
2
C
B
A
1 2 3 4
7
6 8
F
E
D
5
RevNo Revision note
6 7
C
B
Checked
8
Date Signature
A

Schematic Diagrams
PREAMP

Schematic Diagrams
POWER AMP

E250P
Integrated Circuit Diagrams
OPAMP, QUAD
TL074CDR
U2, 3
OPAMP, DUAL
TL072CDR SO-8,
NJM4558M-TE3
U5, 6, 4
IR2111 HALF-BRIDGE
DRIVER
U7
2
Base
3 Collector
1 Emitter
123
2N5401
Q1
2
Base
3 Collector
1 Emitter
123
MPSW06RLRA,
MPSW56RLRAMPQ,
MPS2222ARLRA,
2N2907A, 2N5551,
Q2, 16, 3, 21, 19, 23, 17
MOSFET IRF640
Q18, 22
TIP31C
Q4
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
BEVEL
1. G
2. D
3. S
123
BC
E