Page 1
Northridge E250P/230
Service Manual
Amplifier
Power (RMS): 250 Watts
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
High-Pass
Frequency: 150Hz when using
speaker-level output
Frequency
Response: 25Hz – low-pass
crossover setting
Dimensions
(H x W x D): 500mm x 365mm x 435mm
Weight: 20.1kg
Page 2
2,3
7
11
4
14,15,16
24
1
9
23
6,20
12
21
10
18
5
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
17
19
1
8,13
Page 3
____Destination____ _________________________Description____________________________ ___Part No.___ .
r
r
r
r
r
r
r
Fuse Label 21x5mm 008-000200-160
Label 97x74.8 t=0.254mm 008-001008-162
Label 200.3x71.1 t=0.254mm 008-002071-000
Gasket 12x15 t=5mm CR 008-061215-000
Gasket PN:L-32 200x20mm t=5mm PORON 008-062002-002
Gasket 200x20mm t=2mm CR4305 008-062002-012
Gasket 321x8 t=1mm CR 008-063208-000
Gasket 93x4 t=1mm CR 008-069304-000
Double-sided PCB;FR-4
R11 Carbon film 2K2 1/4W J TAPING 020-220497-120
R103 MOF Resistor 1K 1W J 021-100401-120
R9 MOF Resistor 1K2 3WS J 8x20 021-120403-020
R6 MOF Resistor 1K2 5WS J 8x25 021-120405-020
R10 MOF Resistor 22R 2W(S) J MB TYPE 15x8 021-220202-120
R104
R125,126 SMD Resisto
R81,82 SMD Resistor 10R 1/8W J 0805 TAPING 024-100298-120
R62 SMD Resisto
R79,83,92,95,96,
105,108,127,65
R20,21 SMD Resisto
R2,17,19,37,54,
58,63,71,
R22-25 SMD Resisto
R3,112 SMD Resisto
Resistor KNP
SMD Resistor 1K 1/8W J 0805 TAPING 024-100498-120
SMD Resistor 10K 1/8W J 0805 TAPING 024-100598-120
199x124x1.6mm (PB-10/12) REV:E 015-201200-003
0R05 3WS J FK TYPE 022-500003-020
0R 1/8W J 0805 TAPING 024-000098-120
100R 1/8W J 0805 TAPING 024-100398-120
10K 1/8W F 0805 TAPING 024-100598-100
100K 1/8W F 0805 TAPING 024-100698-100
100K 1/8W J 0805 TAPING 024-100698-120
R98 SMD Resisto
R39 SMD Resisto
230V Version Harman consumer International Northridge E 250P
11K 1/8W F 0805 TAPING 024-110598-100
120K 1/8W J 0805 TAPING 024-120698-120
Page 4
____Destination____ _________________________Description____________________________ ___Part No.___ .
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
R38 SMD Resisto
R32 SMD Resisto
R67,68 SMD Resisto
R29 SMD Resisto
R45 SMD Resisto
R94 SMD Resisto
R90 SMD Resisto
R1,87,61 SMD Resisto
R118 SMD Resisto
R80,121 SMD Resisto
R48 SMD Resisto
R36 SMD Resisto
R73,64 SMD Resisto
R55 SMD Resisto
R56 SMD Resisto
R7,8,12-15,59 SMD Resisto
R4,5 SMD Resisto
12K1 1/8W F 0805 TAPING 024-121598-100
137K 1/8W F 0805 TAPING 024-137698-100
1K5 1/8W J 0805 TAPING 024-150498-120
18K 1/8W J 0805 TAPING 024-180598-120
187K 1/8W F 0805 TAPING 024-187698-100
20K 1/8W J 0805 TAPING 024-200598-120
220R 1/8W J 0805 TAPING 024-220398-120
2K2 1/8W J 0805 TAPING 024-220498-121
22K 1/8W J 0805 TAPING 024-220598-120
2M2 1/8W J 0805 TAPING 024-220798-120
23K7 1/8W F 0805 TAPING 024-237598-120
243K 1/8W F 0805 TAPING 024-243698-100
2K7 1/8W J 0805 TAPING 024-270498-120
300R 1/8W J 0805 TAPING 024-300398-120
30K 1/8W J 0805 TAPING 024-300598-120
3K3 1/8W J 0805 TAPING 024-330498-120
33K 1/8W J 0805 TAPING 024-330598-120
R26,27 SMD Resisto
R28 SMD Resisto
R93 SMD Resisto
R77 SMD Resisto
R78 SMD Resisto
R30 SMD Resisto
R101,102 SMD Resisto
R76,99,100 SMD Resisto
R85,86 SMD Resisto
R44,47,49,107 SMD Resisto
230V Version Harman consumer International Northridge E 250P
3K32 1/8W F 0805 TAPING 024-332498-100
3K6 1/8W J 0805 TAPING 024-360498-120
3K9 1/8W J 0805 TAPING 024-390498-120
39K 1/8W J 0805 TAPING 024-390598-120
4K3 1/8W F 0805 TAPING 024-430498-100
45K3 1/8W F 0805 TAPING 024-453598-100
47R 1/8W J 0805 TAPING 024-470298-120
470R 1/8W J 0805 TAPING 024-470398-120
4K7 1/8W J 0805 TAPING 024-470498-120
47K 1/8W J 0805 TAPING 024-470598-120
Page 5
____Destination____ _________________________Description____________________________ ___Part No.___ .
r
r
r
r
r
r
r
r
r
A
r
r
r
R
r
r
r
r
r
r
r
r
r
R70 SMD Resisto
R60 SMD Resisto
R51,53 SMD Resisto
R57 SMD Resisto
R122 SMD Resisto
R16,18 SMD Resisto
R46,91,40,41,43,42 SMD Resisto
R33,34,31,50,52,66 SMD Resisto
R69 SMD Resisto
TH1 Thermister TSE-103 K L:50mm 025-010300-000
VR2 VR PN:RD163121R03D-20KBx2(EJ) 026-200595-269
VR1 VR 5K
C33,45,51,66,67,5,10 SMD Ceramic Capacito
C16,36,58 SMD Capacito
C11,42-44,46-49,52
54,55,60,63,71,74,77
C3,7 SMD Capacito
SMD Capacitor 0u1/50V K 0805 X7R TAPING 031-100344-100
470K 1/8W J 0805 TAPING 024-470698-120
4M7 1/8W J 0805 TAPING 024-470798-120
4K87 1/8W F 0805 TAPING 024-487498-100
510R 1/8W J 0805 TAPING 024-510398-120
56K 1/8W J 0805 TAPING 024-560598-120
620R 1/8W F 0805 TAPING 024-620398-100
6K8 1/8W J 0805 TAPING 024-680498-120
68K 1/8W J 0805 TAPING 024-680598-120
82K 1/8W J 0805 TAPING 024-820598-120
PN:RK163111R52B-5KA (EJ) 026-500495-252
0u01/50V K 0805 X7R TAPING 031-100244-100
100pF/50V J 0805 NPO TAPING 031-100343-100
0u1/250V K 1206 X7R TAPING 031-100384-100
C14,15,20,21,19 SMD Capacito
C40,34 SMD Capacito
C62,59 SMD Capacito
C57,61 SMD Capacito
C56 SMD Capacito
C70,C70B END Mylar Capacito
C17,18 NP Capacito
C73 NPE Capacito
C72 NPE Capacito
C35 Electrolytic Capacitor 10uF/25V M (R)0511 P:5 TAPING 034-100525-300
230V Version Harman consumer International Northridge E 250P
220pF/50V J 0805 NPO TAPING 031-220344-100
3300pF/50V K 0805 X7R TAPING 031-330444-300
0u047/50V K 0805 X7R TAPING 031-470244-102
56pF/50V J 0805 NPO TAPING 031-560243-100
560pF/50V J 0805 NPO TAPING 031-560343-102
1uF/250V K P:15 032-100484-200
200u/50V M (R)1321 P:5 033-200645-300
4u7/50V K10 (R)8x13 SBE 033-470444-270
6u8/100V K10 (R)1020 GNE 033-680464-270
Page 6
____Destination____ _________________________Description____________________________ ___Part No.___ .
r
r
r
A
C64 Electrolytic Capacitor 100uF/25V M (R)6.3x11 P:5 034-100625-300
C4,9,41,39,50,53 Electrolytic Capacitor 22uF/25V M (R)5x11 P:5 TAPING 034-220525-301
C37 Electrolytic Capacitor 220uF/16V M (R)0611 P:5 034-220615-301
C1 Electrolytic Capacitor 33uF/25V M (R)0511 P:5 034-330525-300
C12,78 Electrolytic Capacitor 330uF/16V M (R)0812 P:5 TAPING 034-330615-300
C6,8 Electrolytic Capacitor 3300uF/80V M (R)22x48 034-330780-300
C2 Electrolytic Capacitor 4u7/50V M (R)0511 P:5 TAPING 034-470415-301
C65 Electrolytic Capacitor 470uF/16V M (R)0812 P:5 TAPING 034-470615-301
C68,69,26,27,28,29,30 MPE Capacito
C25 MPE Capacito
C31 MPE Capacito
CXAC1 Safety Capacitor PN:HQX0.1K275VACx2 18x6x12mm 039-100384-100
L5 Bead Coil YT-10911 041-115001-000
Power X'fmr YT-10913 150W/5.6Ω(230V/50Hz) 042-018600-000
L2 Inductor 30uH YT-10033 043-300101-000
Inductor 324uH YT-10778 043-324300-000
Inductor 56uH YT-10779 043-560200-000
FB1,FB2 SMD FERRITE BEAD PN:321611 600R/100MHz 1206 044-100100-000
Q2,Q16
Q4 Transistor PN:TIP 31C TO-220 (MOSPEC) 051-003100-000
Q3
Q21
Q19,23
Q1
Q17
Transistor NPN
Transistor PNP
Transistor NPN
Transistor PNP
Transistor PNP
Transistor NPN
0u1/100V J TAPING 038-100363-300
0u15/63V J TAPING 038-150393-300
0u33/63V J TAPING 038-330393-300
PN:MPSW06RLRA TO-92 TAPING(ON) 051-000600-100
PN:MPSW56RLRA TO-92 TAPING(ON) 051-005600-100
PN:MPS2222ARLRA TO-92 TAPING 051-222200-100
PN:MPS2907A RLRA TO-92 TAPING 051-290700-100
PN:2N5401 TO-92 TAPING 051-540101-000
PN:2N5551 TO-92 TAPING 051-555100-000
Q18,22 MOSFET N-Channel PN:IRF640N TO-220 (IR) 051-640001-000
BR1 Bridge Regulator PN:RS804 400V,8
230V Version Harman consumer International Northridge E 250P
052-400080-000
Page 7
____Destination____ _________________________Description____________________________ ___Part No.___ .
K
k
U7 IC;DIP,DRIVER PN:IR2111 8PIN (IR) 053-211100-000
D5,26,29,33,38 SMD DIODE PN:ES1D 200V 1A TAPING 054-000100-100
D35 SMD ZENER DIODE PN:BZX84C10 10V SOT-23 TAPING 054-001002-100
D6,7,9 SMD ZENER DIODE PN:BZX84C15 15V SOT-23 TAPING 054-001501-100
U5,6 SMD IC PN:TL072CDR SO-8 TAPING (TI) 054-007200-100
U2,3 SMD IC;(OP) PN:TL074CDR TAPING (TI) 054-007400-100
Q7 SMD Transistor PN:DTC114TKA SMT3 TAPING (ROHM 054-011400-100
Q11,14,13,5,8,9 SMD Transistor PN:MMBT3904LT1 SOT23 TAPING(ON 054-033904-100
Q6,10,12,15 SMD Transistor PN:MMBT3906LT1 SOT23 TAPING(ON 054-033906-100
U4 SMD IC;(OP) PN:NJM4558M-TE3 DMP-8 TAPING 054-045580-100
D24,36,37 SMD ZENER DIODE PN:BZX84C5V6 5.6V SOT-23 TAPIN 054-050601-100
D1-4,8,10-23,27,
28,30-32,34,39
Q20,24,26 SMD Transistor (PNP) PN:MMBT5401 LT1 SOT-23 TAPING 054-540100-100
Q25 SMD Transistor (NPN) PN:MMBT5551 LT1 TAPING (ON) 054-555100-100
S- Terminal PC205 (t=0.8m/m) T205MA 072-040039-000
230V Version Harman consumer International Northridge E 250P
SMD DIODE PN:LL4148 TAPING (Wishay) 054-414803-100
Knob ABS
Strain Relief P/N SB4F-2 061-314002-000
Rubber Foot ID:6.2 OD:11.5 t=2mm 061-400014-000
Myca 13x18mm TO-220 061-700044-000
Bracket for Power Transistor P/N:TRK-1 063-010012-000
Plate 322x105.7x15mm BLK (94V0)ABS 063-321100-001
Bucket 322x105.7x146.5mm BLK (94VO) 063-531808-000
CABLE TIE CV-120S 066-120300-900
Fiber Washer OD=8mm ID=3.2 t=1 071-100608-100
Washer ID=5.1 OD=12 t=1m/m 071-100851-000
RCA Jac
φ20x15m/m UL94V-0 BL
SCJ-1020 2P(G) WHT,RED 072-010007-000
061-020000-000
Page 8
____Destination____ _________________________Description____________________________ ___Part No.___ .
A
K
S+ Terminal PC250(t=0.8),T250MA 072-040064-000
C1,AC3,T1,T2,
SW2,SW4,AC2
SW5,SW6 Toggle Switch PN:L101-T2B4QE 074-030002-000
K1 Relay PN:943-1C-48D 074-300018-000
Terminal (t=0.8mm) PC187(0.8) 072-040096-000
Connector 2 PIN JS-1001-2 P:2.5mm 072-040169-000
B.P. W / Accessory Parts 072-060170-000
BP Plug PN:A414B-3A RCA JAM BL
BP Plug PN:A414R-3A RCA JAM RED 072-060214-000
Black Anodized 70x58x20mm 073-032315-601
Fuse Clip P/N:CFFH1206 073-050001-000
ROCKER SW (POWER) PN:RF1003-BB4-0 074-020018-000
Tinned Plated Copper Wire φ0.6x63m/m TAPING 080-060351-009
Wire Set #22 UL1007
VDE Power Cable LF2-75 6 Feet 2PIN Black T187F 086-021818-030
FUSE:VBS UTE FUSE:1.25A,250V,5*20mm 093-205201-320
Wire #16AWG UL1007 Black, L=610mm Transparent Sleeve both ends
Wire #16AWG UL1007 Green L=610mm Transparent Sleeve both ends
Wire BLK #18 UL1617
L=410mm 082-022241-001
T187 L:140mm Transparent Sleeve both ends 181-981800-104
072-060213-000
181-911600-161
181-911655-135
Wire Wht #18 UL1617
230V Version Harman consumer International Northridge E 250P
T187 L:160mm Transparent Sleeve both ends 181-981899-101
Page 9
Page 10
Page 11
Page 12
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)
OP AMP
LED
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)
And This
Point
Get this
Reading
GND V- GND GND GND GND GND GND GND GND
71.7V 0V -71.7V 0V -71.7V -71.5V -71.2V 0V 0V 4.65V
Q10(C)
U7(1) U7(2) U7(4) U7(6) U7(7) U7(8)
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
Page 13
E250P
Testing Procedure
- Voltage measurements
OP AMP
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
Measure voltage at S+ speaker output
-Voltage measurement
X’OVER FREQ. Setting Output
CW 14.03V
CCW 4.8V
Line level input
SPEAKER
O/P
4. LFE
-Set up Set Generator at 200mV@200Hz
Signal to
Measure voltage at S+ speaker output
LFE switch Setting Output
Normal 6V
LFE 18.32V
See flow chart next page for diagnostics.
Line level input
Page 14
E250P
Testing Procedure
,
POWER MODULE TESTING FLOW CHART
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
CAUTION : SPEAKER OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT
Resistance check
(no load)
between V+ V-,
V+ O/P,V- O/P
and O/P to GND
Check +/-15V-MOD
+/-15V voltage at
U 6(8),U6(4)
is > 10K
no
no
OK
yes
Replace
Q18,Q22
OK
yes
I/P:10mv/50HZ
Power up with no
signal input
LED RED
no
no
OK
yes
yes
Discharge C37,
Check fuse
transformer, L4,
rectifier, C6 and C8
Check +15V/SW
Q4(E) TO V-
OK
Check
Check Q4(E)
TO V-
= 0V D.C.
U7(1) = -58.3V
Check
FB1,FB2,C45,
C50,C60,C63,
R81,R82
Check
MUTE(-12.9V),
And
Q24,Q25,Q26
no
no
OK
yes
yes
Check
MUTE(+8V) and
Q24,Q25,Q26
OK
Check
U7,Q16,Q17,
Q20,Q21,R87,
D26,D35,C64
Use scope to
Use scope to check
switching
frequency U6(7)
100KHz
check O/P U7(6)
and GND
143Vp-p square
wave shown
+/-10% , ~24Vp-p
no
OK
no
OK
yes
yes
Check
L2,L3,C71,C72,
CLASS D AMP OK
C73
C74
Page 15
Block Diagram
1
2
3
4
A
SPEAKER LEVEL
INPUT
PHASE CTRL
SWITCH
5
RevNo Revision note
6
7
Date Signature
8
Checked
A
Rin
Lin
B
Rout
DIF. AMP
SUMMI NG AMP
VOLUME CTRL
AMP STAGE
HPF
12dB/Octave
LPF
12dB/Octave
LPF
Variable
12dB/Octave
B
Lout
Line Level
Input
C
D
SIGNAL SENSE
SIGNAL SENEING
MUTE
ATO
* FUSE
DC OFFSET
PROTECTION
THERMAL
PROTECTION
CURRENT
PROTECTION
LINEAR
POWER SUPPLY
MUTE
CLASS D
AMPLIFIER
LIMITER /
LPF
OUTPUT-RELAY
SUMMI NG AMP
LFE
NORMAL
C
D
5.6 OHMS
EXTERNAL LED INDICATORS
E
CONTROLLED
REGULATOR
+15V SW
E
MUTE
NOTE :
120 VAC T2A-250V
F
230 VAC T1.25A-250V
1
2
3
6
7
8
F
Page 16
Page 17
Page 18
E250P
Integrated Circuit Diagrams
2N5401
Q1
3 Collector
2
Base
1
2
3
1 Emitter
MPSW06RLRA,
MPSW56RLRAMPQ,
MPS2222ARLRA,
2N2907A, 2N5551,
Q2, 16, 3, 21, 19, 23, 17
3 Collector
2
Base
1
2
3
1 Emitter
OPAMP, QUAD
TL074CDR
U2, 3
BEVEL
OPAMP, DUAL
TL072CDR SO-8,
NJM4558M-TE3
U5, 6, 4
MOSFET IRF640
Q18, 22
1. G
2. D
3. S
3
12
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
IR2111 HALF-BRIDGE
DRIVER
U7
BC
E
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