E250P Service Manual Northridge E-Series

Northridge

™

E-Series

E250P

Powered Subwoofer

Service Manual

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797 Rev2 2/2004

E250P

- CONTENTS -

BASIC SPECIFICATIONS …………….……..…………..1

SAFETY INFORMATION

…………….……..….………..2

DETAILED SPECIFICATIONS ……….……..…………..3

CONNECTIONS………………………...……..…...…..…4

OPERATION ……..………………….……...…….….…...7

BASIC TROUBLESHOOTING..………….………………8

EXPLODED VIEW/PARTS LIST…….….….…………....9

TEST SET-UP AND PROCEDURE….….……………...10

AMPLIFIER BLOCK DIAGRAM…….………….……..…11

TECH TIP JBLTT2003-04 ..……….……………….…...12

DETAILED TROUBLESHOOTING..……………… ……13

P.C.B. DRAWINGS….…………………………………….16

ELECTRICAL PARTS LIST ..……….……….……….…20

IC/TRANSISTOR PINOUTS..……..….…….….….….….24

SCHEMATICS………..……………………….…………..25

PACKING……..……………………………….….….…...27

E250P SPECIFICATIONS

Amplifier Power (RMS): 250 Watts

Peak Dynamic Power *: 550 Watts

Inputs: Line Level (switchable to LFE) and Speaker

Level with 5-way binding posts

Low-Pass Frequency:

Frequency Response:

Variable from 50Hz to 150Hz

25Hz – Low-pass crossover setting

Dimensions (H x W x D): 19-3/4" x 14-3/8" x 16-1/2"

(502mm x 365mm x 419mm)

Weight:

JBL continually strives to update and improve existing products, as well as create new ones. The specifications and details in this and related JBL publications are therefore subject to change without notice.

*

The Peak Dynamic Power is measured by recording the highest center-to-peak voltage measured across the output of a resistive load equal to minimum impedance of the transducer, using a 50Hz sine wave burst, 3 cycles on, 17 cycles off.

1

E250P

SAFETY INFORMATION

Warning

Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock. Therefore, any service procedures are to be performed by qualified service personal ONLY!

Caution

Early revisions of the unit did not have a power switch.

Hazardous voltages are resent within the unit whenever it is plugged in.

Before amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is plugged in. Do not exceed rated voltage by more than 10%: operation below

90% of rated voltage will cause poor performance or may shut the unit off.

Leakage/Resistance Check

Before returning the unit to the customer, perform a leakage or resistance test as follows:

Leakage Current. Note there is no power switch on early revisions of this unit. When the power plug is plugged in, the unit is live. Connect the unit to its rated power source.

Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test. If leakage current exceeds 0.5mA, the unit is defective. Reverse the polarity of the AC supply and repeat.

Resistance. Measure the resistance from either side of the line cord to chassis ground, If it is less than 500k ohms, the unit is defective.

WARNING! DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected.

Critical Components

All components identified with the IEC symbol in the parts list and schematic diagram designate components in which safety can be of special significance when replacing identified with. Use only the replacement parts designated in the parts list or parts with the same rating of resistance, wattage or voltage.

List of Safety Components

Requiring Exact Replacements

Part Number/

Designator

F1

093-105202-300

083-041802-009

Description

Line Fuse Slo Blo 2.0A

5x20mm

250V UL approved SPT-2 or better with polarized plug, UL approved wired with the hot side to fused side. Use with factory replacement panel strain relief

(70305) only.

PT1

042-010053-003

BR1

052-400080-000

Power Transformer.

Use only factory replacement.

Bridge diode. Use only factory replacement.

C6,8

034-330780-300

063-531808-000

Inductor

043-560200-000

Inductor

043-300101-000

Inductor

043-700101-000

Inductor

043-324300-000

3300uF 80V electrolytic filter caps. Be sure replacement part is at least the same working voltage and capacitance rating. Also the lead spacing is important.

Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration.

Rear Amp Cover

Use only factory replacement

L1 - Use only factory replacement




2

Residual Noise Floor

Residual Noise Floor

Input Impedance

Line Input (L, R,LFE)

Speaker/Hi Level Input

Filters

LP filter 4th order fixed

Subsonic filter (HPF) 3rd Orde

LFE Low pass 2nd order

HP speaker out connector

Note: 120V Models do not have speaker output

Limiter

THD at Max. Output Power

Features

Volume pot Taper (lin/log)

Phase switch

LP Filter defeat switch

Input Configuration

Line In (L,R) & LFE

Spkr/Hi Level In

Signal Sensing (ATO)

Auto-Turn-On (yes/no)

ATO Input test frequency

ATO Level LFE Input

ATO Level Speaker in

ATO Turn-on time

Auto Mute/ Turn-OFF Time

Power on Delay time

Transients/Pops

ATO Transient

E250P

JBL E250P Powered Sub/ Plate Amp

LINE VOLTAGE

US 120vac/60Hz

EU 230vac/50-60Hz

Yes/No

Yes

Yes

Parameter

Amp Section

Type (Class AB, D, other)

Load Impedance (speaker)

Rated Output Power (120VAC

Rated Output Power (230VAC

Specification

D

5.6

150

150

Hi/Lo Line

108-132

207-264

Unit

n/a

Ohms

Watts

Watts

Nom.

120

230

Vrms

Vrms

QA Test

Limits

n/a n/a

140

130

Nominal

Unit

Conditions

AVG RMS Dynamic Power

THD @ Rated Power

THD @ 1 Watt

DC Offset

Damping factor

Input Sensitivity

Input Frequency

L&R

LFE input

Speaker/Hi Level Input

Signal to Noise

SNR-A-Weighted

SNR-unweighted

SNR rel. 1W-unweighted

Notes

Normal Operation

Normal operation, MOMS required

Notes

250

0.3

Watts

%

0.1

%

10 mV-DC

>50 DF

50 Hz

240 mVrms

240 mVrms

2.4

Vrms

225

1

0.5

30

35

22k filter

22k filter

@ Speaker Outputs

Measured at amplifier board

50

±2dB

±2dB

±2dB

Nominal Freq.

To 150 Watts

To 150 Watts

To 150 Watts

Domestic version only 120 VAC-60 Hz

EU Version only 230 VAC-50 Hz

Average RMS power, 3/20 Cycles 50 Hz, Driven

6dB above its input sensitivity sensitivity

145 Watts

Measured at the speaker cable. 150 Watts @

THD < 0.1 % @ 50 Hz

Single input driven

Single input driven, LFE switch ON

Single input driven

90

85

65

1 dBA dBr dBr mVrms

1.5 mVrms(max)

70

70

60

2

2 relative to rated power relative to rated power relative to 1W Output

A-Weighting filter

22k filter

22k filter

Volume @max, using RMS reading

DMM/VOM (or A/P) BW=20 Khz.

Volume @max, w/ A/P Swept

Bandpass Measurement (Line freq.+ harmonics) (BW=20 Khz)

Line level inputs must be terminated using

1KOHM

Line level inputs must be terminated using

1KOHM

10K

> 4.7K

ohms ohms n/a n/a

Nominal

Nominal

60-180 Hz

Fixed

200>LP<1K Hz

200 Hz

100 Hz n/a

--

LOG

0-180

YES n/a

-deg

± 10

± 10

± 10

2nd order variable + 2nd order fix-24 db/Octave

LFE input driven only

Speaker input driven - Speaker out loaded with 4 Ohms (Applies only to 230V Model)

Speaker input driven - Speaker out loaded with 8 Ohms (Applies only to 230V Model) functional Maximum Output Power functional functional functional

Maximum THD as a result of limiting.

A Taper

Disables LP filter, intended for LFE

YES

YES

--

-functional functional

YES

50

4

50

Hz mV mV

5 ms

15 minutes

3 sec.

functional functional functional functional functional

15

"

"

"

Amp connected and AC on, then input signal applied

T before muting, after signal is removed

4

AC Power Applied

Maximum acceptable level.

Maximum acceptable level.

Auto turn of time (T) must be 5 > T < 15

Minutes

5 mV-peak n/a @ Speaker Outputs

3

Dual RCA jack

Binding post connector L&R

E250P

Parameter

Turn-on Transient

Turn-off Transient

Efficiency

Efficiency

Specification Unit

50 mV-peak

50 mV-peak

QA Test

Limits

2v-pp

2v-pp

Conditions

@ Speaker Outputs

@ Speaker Outputs

Notes

AC Line cycled from OFF to ON

AC Line cycled from ON to OFF

Stand-by Input Power

Power Cons. @ rated power

65

24

234

%

Watts

Watts

64

26

240

@ nom. line voltage

@ nom. line voltage

Nominal Line voltage 120 VAC

Maximum allowable input power under nominal

Input voltage and frequency, HOT or COLD operation.

150 Watts @ 5.6 Ohms nominal line voltage

Protections

Short Circuit Protection

Thermal Protection

DC Offset Protection

Line Fuse Rating

YES

YES

USA-Domestic 2

EU

YES

1.25

Amps

Amps functional Direct short at output functional

-

@1/8 max unclipped Power at 1.06 times the input voltage

DC present at Speaker Out leads

Amplifier should resume operation after short circuit condition removal

Temperature rise in accessible metal parts should not exceed 35K rise for domestic version or 30K rise for European versions (refer to requirements sheet).

Design must insure no Offset at the speaker output under any operating condition including abnormal operation

2

1.25

4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.

Type-T or Slo Blo-250 V

Type-T or Slo Blo-250 V, Low

Breaking capacity

Internal fuse with UL/SEMKO rated holder

Internal fuse with UL/SEMKO rated holder

SPEAKER CONNECTION

When we designed the

E150P and E250P powered subwoofers, our goal was to offer the user the best possible performance combined with the most flexible and complete installation options.

Please look over the following three examples to determine which description best matches your system and follow the corresponding hookup instructions.

To use the binding-post speaker terminals with bare wire, unscrew the collar until the hole through the center post is visible under the collar.

Insert the bare end of the wire through the hole in the post, then screw the collar back down until the connection is tight. The holes in the center of the collars are intended for banana-type connectors.

Speakers and electronics terminals have corresponding positive

(+) and negative (–) terminals. It is important to connect both speakers identically: positive (+) on the speaker to positive (+) on the amplifier and negative (–) on the speaker to negative (–) on the amplifier.

Wiring “out of phase” results in thin sound, weak bass and a poor stereo image.

NOTE: The speaker-level connection method described on the next page is not a preferred connection

and should only be resorted to if your receiver/ processor does not have a line-level or subwoofer output.

The customer is responsible for proper connections, and any damage to JBL or other equipment due to improper connections will not be covered by your JBL warranty. Consult with your JBL dealer or an audioinstallation expert if you have any questions about how to connect your subwoofer using the speaker-level inputs.

4

E250P

Analog Receiver/Processor – Speaker-Level Connections

Use this installation method

only with an analog receiver/ processor that does not have digital processing or bass management, and also does not have a subwoofer output or a volume-controlled preamp

(line-) level output:

Connect the speaker wires for both your main left and right speakers, and for the subwoofer, to the same speaker terminals on your receiver or amplifier. The wires may be joined by twisting together the bare ends of the two leads that will be connected to each terminal on the receiver/ amplifier, as shown in the diagram. This procedure should be done only four times

(involving a total of eight barewire ends), and only for those wire ends that are being connected to the terminals on your receiver/amplifier.

It is important that you avoid join-

ing any other wires. Do not twist together wire ends that are being inserted into terminals on any speaker or on the subwoofer. Do not twist together wire ends that will be used for any speakers other than the front left and right speakers or the subwoofer.

Refer to the connection diagram for guidance.

Twist together the (+) leads at one end of the speaker wires that you have designated for the left front speaker and for the left high-level inputs on the subwoofer. Insert the joined (twisted) wires into the left front (+) terminal on your receiver/amplifier. Connect the free end of the (+) lead for the left front speaker to the (+) terminal on the back of the speaker. Connect the free end of the (+) lead for the left input on the subwoofer to the left binding-post terminal. Repeat this process for the (–) connections for the left front

Left Front

+ –

Center

+ –

speaker and left input on the subwoofer, and then for the (+) and (–) connections for the right front speaker and right high-level inputs on the subwoofer.

Connect your receiver or amplifier’s center and surround speaker terminals to the corresponding terminals on the back of your center and surround speakers.

Right Front

+ –

Left Front

+ –

Left Surround

+ –

Left Surround

+ –

Twist

Here

Subwoofer

+ –

Receiver

Center

+ –

HIGH

LEVEL

IN

Right Front

+ –

Twist

Here

Right Surround

+ –

Right Surround

+ –

To (+) terminal on left speaker

To (+) terminal of left input on subwoofer

To front left

(+) terminal on receiver/amplifier

5

E250P

Analog Receiver/Processor – Line-Level Connections

Use this installation method with an analog receiver/ processor that does not have digital processing or bass management, and that is equipped with a full-range subwoofer output or a volumecontrolled preamp (line-) level output:

Use RCA-type interconnect cables to connect the linelevel subwoofer outputs on your receiver or amplifier to the line-level inputs on the subwoofer.

IMPORTANT: Make sure that the LFE toggle switch on the subwoofer is in the “Normal” position. Do not use the

“LFE” position with Dolby*

Pro Logic*-only processors.

Note: If your receiver or amplifier has only one subwoofer output jack, then you may connect the subwoofer output on your receiver/preamplifier to either the left or right line-level input on the subwoofer. It makes no difference which jack you choose.

Connect each speaker to the corresponding speaker terminals on your receiver or amplifier.

Make sure your receiver or processor is configured so that the subwoofer is “On.”

RECEIVER

Subwoofer

Out

L R

Note for advanced users: If your receiver/ processor has a built-in lowpass crossover filter for the subwoofer output, then the LFE switch should be set to the

“LFE” position to bypass the subwoofer’s internal crossover.

LEVEL

Min Max

LFE NORMAL

PHASE

0º 180º

CROSSOVER

FREQUENCY

50Hz 150Hz

L R

LINE LEVEL IN

For LFE use L or R

L

HIGH

LEVEL

IN

R

+ –

Digital Receiver/Processor – LFE Connection

Use this installation method for Dolby Digital, DTS ® or other digital surround processors that have bass-management programming, or for analog receivers/processors that have a filtered subwoofer output:

IMPORTANT: Make sure that the LFE toggle switch on the subwoofer is in the “LFE” position. Use the line-level input jacks for the Low-

Frequency Effects channel.

Connect these jacks to the LFE output or subwoofer output on your receiver or amplifier.

Note: If your receiver or amplifier has only one subwoofer output jack, you may connect the subwoofer output on your receiver/preamplifier to either the left or right line-level input on the subwoofer. It makes no difference which jack you choose.

Connect each speaker to the corresponding speaker terminals on your receiver or amplifier.

Make sure that you have configured your surround sound processor for

“Subwoofer On” or

RECEIVER/PREAMPLIFIER

Subwoofer

Output/LFE

“LFE On.” The front, center and surround speakers should be set to “Small” or “Large” depending on their size and frequency response. Consult your receiver’s or processor’s owner’s manual.

6

LEVEL

Min

Max

LFE NORMAL

PHASE

0º 180º

CROSSOVER

FREQUENCY

50Hz

150Hz

L R

LINE LEVEL IN

+ –


L

HIGH

LEVEL

IN

R

LEVEL

Min Max

LFE NORMAL

PHASE

0º 180º

CROSSOVER

FREQUENCY

50Hz 150Hz

L R

LINE LEVEL IN


L

HIGH

LEVEL

IN

R

+ –

ON

POWER

OFF

120V

60Hz

Northridge E Series

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

E250P

OPERATION

Power

When the unit is plugged in and the power switch is on and no signal is received, the

LED on the top of the unit will turn red. When a signal is present, the LED will turn green.

Note: It will take several minutes for the LED to turn from green to red after the input signal to the subwoofer is removed. Due to JBL’s unique high-output, high-efficiency amplifier design, power consumption is minimal when the subwoofer is not receiving a signal. Of course, the subwoofer can be turned off, whenever desired, if you do not wish to leave it in auto

(standby) mode.

Level Control

The subwoofer Level Control adjusts the volume of the subwoofer relative to the rest of the system. Proper level adjustment depends on several variables such as room size, subwoofer placement, type of main speakers and position. Adjust the subwoofer level so that the volume of the bass information is pleasing to you.

Crossover Adjustments

The Crossover Frequency

Control determines the highest frequency at which the subwoofer reproduces sounds. If your main speakers can comfortably reproduce some lowfrequency sounds, set this control to a lower frequency setting, between 50Hz and

100Hz. This will concentrate the subwoofer’s efforts on the ultradeep bass sounds required by today’s films and music. If you are using smaller bookshelf speakers that do not extend to the lower bass frequencies, set the low-pass crossover control to a higher setting, between 120Hz and

150Hz. This control is not used when the LFE switch is in the

“LFE” position.

7

E250P

Phase Control

The Phase Control determines whether the subwoofer’s piston-like action moves in and out in phase with the main speakers or opposite the main speakers. There is no correct or incorrect setting.

Proper phase adjustment depends on several variables such as subwoofer placement and listener position. Adjust the phase switch to maximize bass output at the listening position.

Remember, every system, room and listener is different.

There are no right or wrong settings; this switch offers the added flexibility to adjust your subwoofer for optimum performance for your specific listening conditions without having to move your speakers.

If at some time in the future you happen to rearrange your listening room and move your speakers, you should experiment with the phase switch in both positions, and leave it in the position that maximizes bass performance.

TROUBLESHOOTING

If you used the high-level

(speaker) inputs and there is no sound from any of the speakers:

• Check that the receiver/ amplifier is on and a source is playing.

• Check that the powered subwoofer is plugged into an active electrical outlet and is switched on.

• Check all wires and connections between the receiver/ amplifier and the speakers.

Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured, or touching each other, except for the wires for the front left and right speakers, which may be joined with the wires for the subwoofer at the receiver/ amplifier end only, if you are using the speaker-level connections as described on page 4.

• Review proper operation of your receiver/amplifier.

If there is low (or no) bass output:

• Make sure the connections to the left and right “Speaker

Inputs” have the correct polarity (+ and –).

• Make sure that the subwoofer is plugged into an active electrical outlet and switched on.

• Adjust the crossover point.

• Flip the Phase Control switch to the opposite position.

• If you are using a Dolby

Digital/DTS receiver or processor, make sure that the subwoofer adjustments on the receiver/processor are set up correctly.

• Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass.

If you used the line-level inputs and there is no sound from the subwoofer:

• Check that the receiver/ amplifier is on and a source is playing.

• Check that the powered subwoofer is plugged into an active electrical outlet and is switched on.

• Check all wires and connections between the receiver/amplifier and the subwoofer. Make sure all wires are connected. Make sure none of the wires are frayed, cut or punctured, or touching each other.

• Review proper operation of your receiver/amplifier.

• Slowly turn the Level

Control clockwise until you begin to hear the desired amount of bass.

• Make sure that you have configured your receiver/ processor so that the subwoofer/LFE output is on.

8

E250P

Exploded View

14

15 6 7 10

Amplifier – Not for Sale

17

11 16 12

8

9

13

Ref# Part

6 351348-001

7 338125-002

8 336486-001

9

10

11

12 338128-002

E250P

763-31110-40 SCREW, 8 X 2 1/2,TR,PH,PB,BLK ZINC,LCS (FOOT)

908302-012 SCREW, PB,HXS,#6x.75,ZINC (LOGO PLATE)

903802-016 SCREW, PB,HXS,#8x1",ZINC (WOOFER)

Qty

1

1

4

4

4

8

1

1 13

15

336799-001 ASY, PORT TUBE

14 351307-001 GRILLE, BLK, FRNT 1

333249-003

ASY, WOOFER,12" DCR 4.8 Ω

CUP,GRILLE,TITANIUM, (BEECH MODEL) (CHERRY

MODEL)

333249-001 CUP,GRILLE (BLACK MODEL)

16 351243-001

17

RING,TRIM,12"-E250P

4

4

1

903401-012 SCREW, 6 X 3/4,PAN,PH,PB,BLK ZINC,LCS (AMPLIFIER) 10

E250P

TEST SET-UP AND PROCEDURE

General Function

UUT = Unit Under Test

1) Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. LEVEL control should be full counterclockwise (MIN). Make sure the LFE/Normal switch is in the NORMAL position.

2) Turn on generator, adjust to 100mV, 50Hz.

3) Plug in UUT; Turn Main Power switch ON. LED’s on the top panel may be either Red or Green. Turn LEVEL control full clockwise (MAX). Low Pass control should be set fully clockwise (150Hz).

4) LED should turn Green; immediately bass response should be heard and felt from port tube opening.

5) Turn off generator, turn LEVEL control fully counterclockwise (MIN), disconnect RCA cables.

6) Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.

7) Turn on generator and adjust so that speaker level output is 1.0V, 50Hz. Turn LEVEL control full clockwise (MAX).

8) Green LED should light, immediate bass response should be heard and felt from the port tube opening.

Sweep Function

1) Follow steps 1-4 above, using a sweep generator as a signal source.

2) Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.

Driver Function

1) Remove driver from cabinet; detach + and - wire clips.

2) Check DC resistance of driver; it should be 4.8 ohms.

3) Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5.0V.

4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.

10

E250P

11

E250P

TECH TIPS

Troubleshooting tips and solutions to common service problems

For models: E150P,E250P and PB10,PB12 (Revision 2) * TIP# JBLTT2003-04 Rev1

Subject:

Replacing MOSFETS Q18, Q22

In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use

ONLY the JBL part# FE106401110 or only the brands: International Rectifier, or Fairchild.

Replace both Q18 and Q22 MOSFET’s in the circuit, even if only one seems to be damaged.

Do NOT mix & match these components from different manufacturers, or batches. They should be identical.

* Late version PB10 or PB12 subwoofers (Revision 2 in the service manual) can be identified by:

• Amplifier serial number starts with “HA”

•

Output transistors in the open, on a large black heatsink

• Large plastic cup enclosing the rear of the amp assembly

• Main PCB, bottom, solder-side contains all SMD devices

.

12

E250P

DETAILED TROUBLESHOOTING

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 >1M

Ω

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

RED

GREEN

P-U4(1)

0Vrms

7.13Vrms

OP AMP

P-U4(7)

11.84VDC

-12.93VDC

3. D.C. Operation

-Voltage measurements (DVM) on CLASS D POWER AMP

Between

And This

Point

Get this

Reading

V+

GND

Q4(E) Q1(C)

Q10(C)

U7(1) U7(2) U7(4) U7(6) U7(7) U7(8)

VGND GND GND GND GND GND GND GND

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

13

E250P

DETAILED TROUBLESHOOTING (CONT'D)

- Voltage measurements

U2(1)

306.9mV

OP AMP

U2(14) U2(8) U3(7) U3(1) U3(14) U3(8) U5(7)

461mV 460mV 658mV 628mV 598mV 2.326V

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

Output

14.03V

4.8V

-Set up Set Generator at 200mV@200Hz

Signal to

Line

level input

Measure voltage at S+ speaker output

LFE switch Setting

Normal

LFE

Output

6V

18.32V

See flow chart next page for diagnostics.

14

E250P

DETAILED TROUBLESHOOTING (CONT'D)

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)

no

no

OK

Replace

OK Q18,Q22

yes

yes

Power up with no signal input

LED RED

I/P:10mv/50HZ

Check +15V/SW

Q4(E) TO V-

15V

no

Discharge C37,

no

OK

Check fuse

OK transformer, L4,

yes rectifier, C6 and C8

yes

Check

U7(1) = -58.3V

Check Q4(E)

TO V-

= 0V D.C.

no

no

OK

Check

OK

MUTE(+8V) and

yes

Q24,Q25,Q26

yes

Use scope to check switching frequency U6(7)

100KHz

+/-10% , ~24Vp-p

Use scope to check O/P U7(6) and GND

143Vp-p square wave shown

no

OK

no

OK

yes

yes

CLASS D AMP OK

END

Check

L2,L3,C71,C72,

C73,C74

Check

FB1,FB2,C45,

C50,C60,C63,

R81,R82

Check

MUTE (-12.9V),

And

Q24,Q25,Q26

Check

U7,Q16,Q17,

Q20,Q21,R87,

D26,D35,C64

15

E250P

16

E250P

17

E250P

18

E250P

19

E250P

E250P Electrical Parts List

Description Part Number

Resistors

020-220497-120 Carbon Film

021-100401-120 MOF Resistor




022-500003-020 KNP Resistor

024-000098-120 SMD Resistor



































2K2 1/4W J

1K 1W J

1K2 3WS J 8x20

1K2 5WS J 8x25

22R 2W(S) J MB TYPE 15x8

0R05 3WS J FK TYPE

0R 1/8W J 0805

10R 1/8W J 0805

100R 1/8W J 0805

1K 1/8W J 0805

10K 1/8W J 0805

100K 1/8W J 0805

11K 1/8W F 0805

120K 1/8W J 0805

12K1 1/8W F 0805

137K 1/8W F 0805

1K5 1/8W J 0805

18K 1/8W J 0805

187K 1/8W F 0805

20K 1/8W J 0805

220R 1/8W J 0805

2K2 1/8W J 0805

22K 1/8W J 0805

2M2 1/8W J 0805

23K7 1/8W F 0805

243K 1/8W F 0805

2K7 1/8W J 0805

300R 1/8W J 0805

30K 1/8W J 0805

3K3 1/8W J 0805

33K 1/8W J 0805

3K32 1/8W F 0805

3K6 1/8W J 0805

3K9 1/8W J 0805

39K 1/8W J 0805

4K3 1/8W F 0805

45K3 1/8W F 0805

47R 1/8W J 0805

470R 1/8W J 0805

4K7 1/8W J 0805

47K 1/8W J 0805

20

Reference Designator

R11

R103

R67,68

R29

R45

R94

R90

R1,87,61

R118

R80,121

R48

R36

R73,64

R55

R56

R7,8,12-15,59

R9

R6

R10

R104

R125,126

R81,82

R62

R79,83,92,95,96,105,108,127,65

R2,17,19,37,54,58,63,71,

R3,112,22-25

R98

R39

R38

R32

R4,5

R26,27,

R28

R93

R77

R78

R30

R101,102

R76,99,100

R85,86

R44,47,49,107

Qty

1

1

7

1

2

2

1

1

3

1

1

1

2

1

1

1

1

6

1

9

8

2

2

1

1

1

1

1

1

1

1

1

1

2

2

2

4

2

3

1

1

E250P

Part Number










025-010300-000 Thermister

026-200595-269 Freq Pot 20K

026-500495-252 Level Pot 5K

Capacitors

Description

470K 1/8W J 0805

4M7 1/8W J 0805

4K87 1/8W F 0805

510R 1/8W J 0805

56K 1/8W J 0805

620R 1/8W F 0805

6K8 1/8W J 0805

68K 1/8W J 0805

82K 1/8W J 0805

TSE-103 K L:50mm

PN:RD163121R03D-20KBx2(EJ)

PN:RK163111R52B-5KA (EJ)


R70

R60

R51,53

R57

R122

R16,18

R46,91,40,41,43,42

R33,34,31,50,52,66

R69

VR2

VR1

031-100244-100 Ceramic Capacitor

031-100343-100 SMD Capacitor


031-100384-100R SMD Capacitor






032-100484-200 Mylar Capacitor

033-470444-270 NPE Capacitor

033-680464-270 NPE Capacitor

034-100525-300 Electrolytic Capacitor









038-100363-300 MPE Capacitor



039-100384-100 Safety Capacitor

0u01/50V K 0805 X7R

100pF/50V J 0805 NPO

0u1/50V K 0805 X7R

0u1/250V K 1206 X7R

220pF/50V J 0805 NPO

3300pF/50V K 0805 X7R

0u047/50V K 0805 X7R

56pF/50V J 0805 NPO

560pF/50V J 0805 NPO

1uF/250V K P:15

C33,45,51,66,67,5,10

C36,58,16

C11,42-44,46-49,52,54,55,60,63,71,74,77

C3,7

C20,21,19,14,15

C40,34

C62,59

C57,61

C56

C70,C70B

4u7/50V K10 (R)8x13 SBE

6u8/100V K10 (R)1020 GNE

10uF/25V M (R)0511 P:5

100uF/25V M (R)6.3x11 P:5

22uF/25V M (R)5x11 P:5

220uF/16V M (R)0611 P:5

33uF/25V M (R)0511 P:5

330uF/16V M (R)0812 P:5

3300uF/80V M (R)22x48

4u7/50V M (R)0511 P:5

470uF/16V M (R)0812 P:5

0u1/100V J

0u15/63V J

0u33/63V J

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

PN:HQX0.1K275VACx2 18x6x12mm CXAC1

Semiconductors

051-000600-100 NPN Transistor


PN:MPSW06RLRA TO-92 (ON)

PN:TIP 31C TO-220 (MOSPEC)

21

Q2,Q16

Q4

Qty

1

1

1

6

6

1

2

2

1

1

1

1

2

1

7

1

1

1

1

2

2

6

1

1

1

1

1

1

1

2

1

2

2

2

2

5

7

3

16

E250P

Part Number Description

051-005600-100 PNP Transistor





051-640001-000 MOSFET N-Channel

052-400080-000 Bridge Regulator

053-211100-000 IC;DIP,Driver

054-000100-100 SMD Diode

054-001002-100 SMD Zener Diode


PN:MPSW56RLRA TO-92 (ON)

PN:MPS2222ARLRA TO-92

PN:MPS2907A RLRA TO-92

PN:2N5401 TO-92

PN:2N5551 TO-92

PN:IRF640N TO-220 (IR)

PN:RS804 400V,8A

PN:IR2111 Half-Bridge Driver

PN:ES1D 200V 1A

PN:BZX84C10 10V SOT-23

PN:BZX84C15 15V SOT-23

054-007200-100 SMD IC; (Dual OP-Amp) PN:TL072CDR SO-8 (TI)

054-007400-100 SMD IC;(Quad OP-Amp) PN:TL074CDR (TI)

054-011400-100 SMD Transistor

054-033904-100 SMD Transistor

PN:DTC114TKA SMT3

PN:MMBT3904LT1 SOT23

054-033906-100 SMD Transistor PN:MMBT3906LT1 SOT23

054-045580-100 SMD IC; (Dual OP=Amp) PN:NJM4558M-TE3 DMP-8

054-050601-100 SMD ZENER DIODE PN:BZX84C5V6 5.6V SOT-23

054-414803-100 SMD DIODE



050-505200-001 LED

PN:LL4148 (Wishay)

PN:MMBT5401 LT1 SOT-23

PN:MMBT5551 LT1

PN:LT-2402-21

Miscellaneous

065-050400-000 Sleeve

065-100200-000 UL Sleeve

φ3.5mm BLK F32 (125 )

φ2.5 F32-2.5(blk) 125

082-022640-000 Wire Set #26 UL1007 L=400mm blk/wht 2P Housing +5TT

091-000182-000 LED Holder PN:LED5-2A

044-100100-000 SMD Ferrite Bead

041-115001-000 Bead Coil

042-010053-003 Transformer

PN:321611 600R/100MHz 1206

YT-10911

YT-10615-4

043-300101-000 Inductor

043-324300-000 Inductor

043-560200-000 Inductor

043-700101-000 Toroidal Inductor

008-001008-062 Label

008-002007-033 Label

008-061215-000 Gasket C4305

30uH YT-10033

324uH YT-10778

56uH YT-10779

70uH YT-10682

97x74.8 t=0.254mm

200.3x71.1 t=0.254mm

12x15 t=5mm CR

008-062002-002 Gasket

008-062002-012 Gasket (PB10/12)

008-063208-000 Gasket C4305

008-069304-000 Gasket C4305

061-020000-000 Knob ABS

061-314002-000 Strain Relief

PN:L-32 200x20mm t=5mm PORON

200x20mm t=2mm CR4305

321x8 t=1mm CR

93x4 t=1mm CR

φ20x15m/m UL94V-0 BLK

P/N SB4F-2

L5

PT1

L2

L4

L1

L3

22


Q3

Q21

Q19,23

Q1

Q17

Q18,22

BR1

U7

D5,26,29,33,38

D35

D6,7,9

U5,6

U2,3

Q7

Q11,14,13,5,8,9

Q6,10,12,15

U4

D24,36,37

D1-4,8,10-23,27,28,

Q20,24,26

Q25

D1B

Qty

4

1

3

1

6

2

2

1

1

21

3

5

1

3

1

1

1

2

2

1

1

1

1

1

1

1

1

1

E250P

Part Number Description Reference Designator

061-400014-000 Rubber Foot

061-700044-000 Mycar

ID:6.2 OD:11.5 t=2mm blk

13x18mm TO-220

063-010012-000 Brckt for pwr transistor P/N:TRK-1

063-321100-001 Plate 322x105.7x15mm BLK (94V0)ABS

063-531808-000 Bucket

066-120300-900 Cable Tie

071-100608-100 Fiber Washer

071-100851-000 Washer

072-010007-000 RCA Jack

072-040039-000 Terminal

072-040064-000 Terminal

322x105.7x146.5mm blk (94VO)

CV-120S

OD=8mm ID=3.2 t=1 (red)

ID=5.1 OD=12 t=1m/m

SCJ-1020 2P(G) wht, red

PC205 (t=0.8m/m) T205MA

PC250(t=0.8),T250MA

072-040096-000 Terminal T187MA

072-040169-000 Connector

072-060170-000 B.P.

073-032315-601 Black Anodized

073-050001-000 Fuse Clip

074-020018-000 Rocker SW

074-030002-000 Toggle SW

(t=0.8mm) PC187(0.8)

2 PIN JS-1001-2 P:2.5mm

W / Accessory Parts

70x58x20mm

P/N:CFFH1206

PN:RF1003-BB4-0

PN:L101-T2B4QE

074-300018-000 Relay

082-022241-001 Wire set #22 UL1007

PN:943-1C-48D

L=410mm blk/wht

083-041802-009 Power Cable SPT-2 blk T187

093-105202-300 Fuse

181-911600-161 Wire #16AWG UL1007

FUSE:2A,250V,5*20mm blk L=610mm

181-911655-135 Wire #16AWG UL1007 green L=610mm

181-921600-000 blk wire #16 UL1015

181-921699-000 wht wire #16 UL1015

T187 L:140mm

T187 L:160mm

AC1,AC3,T1,T2,AC2,SW2,SW4

SW5,SW6

K1

F1

Qty

2

1

1

23

E250P

1

2

3

2N5401

Q1

2

Base

Semiconductor Pinout Diagrams

OPAMP, QUAD

TL074CDR

U2, 3

MOSFET IRF640

Q18, 22

3 Collector

1. G

2. D

3. S

1 Emitter

1

2

3

MPSW06RLRA,

MPSW56RLRAMPQ,

MPS2222ARLRA,

2N2907A, 2N5551,

Q2, 16, 3, 21, 19, 23, 17

3 Collector

2

Base

1 Emitter

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

OPAMP, DUAL

TL072CDR SO-8,

NJM4558M-TE3

U5, 6, 4

IR2111 HALF-BRIDGE

DRIVER

U7

1 2 3

TIP31C

Q4

B C E

24

E250P

SCHEMATICS

NOTE: THIS VOLTAGE IS

REFERENCED TO -V,

NOT CIRCUIT GROUND


REFERENCED TO -V,

NOT CIRCUIT GROUND

25


REFERENCED TO -V,

NOT CIRCUIT GROUND

26

E250P

2

E250P

Packaging

4

Ref# Part

1 351249-002

2

351249-003

OWNER-E250P/E250P

351249-001 CARTON,MASTER-E250P (BEECH MODEL)

CARTON,MASTER-E250P

350884-003

PAD,END,TOP-E250P

PAD,END,BOT-E250P

5 338381-001

14

CARD,1/5YR,JBL

352024-001 ASY, GRILLE, BLK, FRNT

27

1 5

3

14

Qty

1

1

1

1

1

1

1

1

E250P Service Manual Northridge E-Series

Northridge

™

E-Series

Powered Subwoofer

Service Manual

SAFETY INFORMATION

E250P SPECIFICATIONS

Amplifier Power (RMS): 250 Watts

Peak Dynamic Power *: 550 Watts

Inputs: Line Level (switchable to LFE) and Speaker

Level with 5-way binding posts

Low-Pass Frequency:

Frequency Response:

Variable from 50Hz to 150Hz

25Hz – Low-pass crossover setting

Dimensions (H x W x D): 19-3/4" x 14-3/8" x 16-1/2"

(502mm x 365mm x 419mm)

Weight:

SAFETY INFORMATION

Exploded View

TEST SET-UP AND PROCEDURE

TECH TIPS

DETAILED TROUBLESHOOTING

DETAILED TROUBLESHOOTING (CONT'D)

DETAILED TROUBLESHOOTING (CONT'D)

E250P Electrical Parts List

E250P

Semiconductor Pinout Diagrams

Packaging

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