JBL S-412-P Mk2 Service manual

Studio Series

S412PII

4-way Powered Loudspeaker System

Service Manual

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797 Rev0 6/2002

- CONTENTS -

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

DETAILED SPECIFICATIONS ………..……..…………..2

CONNECTIONS…………….……………………....…..…4

CONTROLS ……..……………….…..……....…….….…..6

BASIC TROUBLESHOOTING..….……….………………7

AMPLIFIER ACCESS….……………….….……………....8

S412PII AMPLIFIER BLOCK DIAGRAM.….………..…..9

S412PII WIRING/PASSIVE SCHEMATIC….………….10

S412PII MECHANICAL/PACKING PARTS LIST ….….11

S412PII EXPLODED VIEW..………………….…. …….12

AMPLIFIER EXPLODED VIEW..…………….………….13

IC DIAGRAMS………………..………………..………….14

S412PII ELECTRICAL PARTS LIST ..……….…….…..15

P.C.B. DRAWINGS….………..………………...….…….18

S412PII SCHEMATICS………..……………..……….….20

S412PII PACKAGING………..……………..……..….….23

JBL S412PII SPECIFICATIONS

Max Recommended Amplifier Power: 250 Watts*

Subwoofer Amplifier Power: 200 Watts

Nominal Impedance 8 ohms

Sensitivity 92dB

Frequency Response 32Hz – 20kHz (±3dB)

Crossover Frequencies 250Hz, 700Hz, 3500Hz

High-Frequency Driver: 1" Pure Titanium Dome, shielded

Midrange Frequency Driver: 4" PolyPlas™ Rubber surround, shielded

Midbass Frequency Driver: 6" PolyPlas™ Rubber surround, shielded

Low Frequency Driver: 12" PolyPlas™ Rubber surround, shielded

Dimensions (H x W x D): 44 x 14 ¾ x 16 1/16” (17” with grille)

1118 x 375 x 408mm (432mm with grille)

Weight (each): 100lbs/45.5kg

* The maximum recommended amplifier power rating will ensure proper system headroom to allow for occasional peaks. W e do not recommend sustained operation at these maximum power levels.

JBL S412PII -120VAC 150W Powered Sub/ Plate Amp

)

LINE VOLTAGE Yes/N

Parameter Specification Unit QA Test

Type (Class AB, D, other) G n/a n/a Load Impedance (speaker) 4 Ohms n/a Nominal Z-curve required Rated Output Power 150 Watts 130 1 input driven 130 W nominal due to limiter non-linearity at

THD @ Rated Power 0.1 % 1 22k filter 130 W THD @ 1 Watt 0.3 % 0.5 22k filter DC Offset 10 mV-DC 20 @ Speaker Outputs Damping factor >150 DF 100 Measured at amplifier board Measured at the speaker connector. 130 Watts

ut Sensitivit

Input Frequency 30 Hz 30 Nominal Freq. LFE input 1.05 Vrms ±2dB To 140 Watts Speaker/Hi Level Input 23.66 Vrms ±2dB To 140 Watts

nal to Nois

SNR-A-Weighted 100 dBA 90 relative to rated power A-Weighting filter SNR-unweighted 70 dBr 70 relative to rated power 22k filter SNR rel. 1W-unweighted 65 dBr 60 relative to 1W Output 22k filter Residual Noise Floor 1 mVrms 5 Volume @max, using RMS reading

Residual Noise Floor 1.5 mVrms(max) 4 Volume @max, w/ A/P Swept

US 120vac/60Hz Yes 108-132 120 Vrms Normal Operation

EU 230vac/50-60Hz Yes 207-264 230 Vrms Normal operation, MOMS required

Asia 100vac/50Hz No N/A 100 Vrms Normal Operation

Sectio

Hi/Lo LineNom. Uni

Conditions Notes

Limits

>75 50 Measured at speaker cable

DMM/VOM (or A/P)

Bandpass Measurement (Line freq. harmonics)

Note

high power

@ THD < 0.08 % @ 50 Hz

ut Impedanc

Speaker/Hi Level Input 10k ohms n/a Nominal

Filter

Speaker in LP 2nd order fixed Fixed Subsonic filter (HPF) LFE Low pass 2nd order Fixed LFE input driven only

Limiter

THD at Max. Output Power n/a n/a functional Maximum Output Power Maximum THD as a result of limiting.

Features

Auto - On selection switch YES -- functional Refer to ATO section LED On-Off switch YES -- functional Dual LED indicator Volume pot Taper (lin/log) LOG -- functional A Taper

ut Configuratio

Line In LFE Spkr/Hi Level In YES -- functional

nal Sensing (ATO

Auto-Turn-On (yes/no) YES functional Auto - on selection switch in Auto ATO Input test frequency 30 Hz functional " ATO Level LFE Input 4 mV functional " ATO Level Speaker in 100 mV functional " ATO Turn-on time 5 ms functional Amp connected and AC on, then

Auto Mute/ Turn-OFF Time 15 minutes 17 T before muting, after signal is

Power on Dela

Line Input 20k ohms n/a Nominal

YES -- functional Single RCA jack

input signal applied

removed

tim

3 sec. 4 AC Power Applied

Maximum

Transients/Po

ATO Transient 5 mV-peak n/a @ Speaker Outputs Turn-on Transient 50 mV-peak 2v-pp @ Speaker Outputs AC Line cycled from OFF to ON Turn-off Transient 50 mV-peak 2v-pp @ Speaker Outputs AC Line cycled from ON to OFF

JBL S412PII -120VAC 150W Powered Sub/ Plate Amp

Efficienc

Stand-by Input Power 15 Watts 17 @ nom. line voltage Maximum allowable input power under nominal

Power Cons. @ rated power 300 Watts 310 @ nom. line voltage 150 Watts @ 4 Ohms nominal line voltage

Protectio

Short Circuit Protection YES functional Direct short at output Amplifier should resume operation after short

Thermal Protection YES functional @1/8 max unclipped Power Temperature rise in accessible metal parts

DC Offset Protection YES - DC present at Speaker Out leads Relay or crowbar (for driver/fire protection) Line Fuse Rating 2 Amps Type-T or Slo Blo-250 V External fuse with UL/SEMKO rated holder

50 % 40 Nominal Line voltage 120 VAC

Input voltage and frequency, HOT or COLD operation.

circuit condition removal

should not exceed 40 deg C.

SPEAKER CONNECTIONS

– +– +

– +

Receiver’s Speaker Outputs

LEFT

RIGHT

– +

CONNECTION TIPS

SPEAKER-LEVEL CONNECTIONS

Your S412PII speakers should be connected to your receiver in two ways (at speaker level and line level) in order to achieve the best performance, especially when listening to program material recorded in digital formats, such as Dolby* Digital and DTS.

Connect the left-front and right-front speaker terminals on your receiver or amplifier

to the 5-way binding posts on the back of each S412P

speaker. Remember to maintain the correct polarities (“+” to “+” and “–” to “–”). The S412PII uses a red binding post for “+” and black for “–”. These connections will provide full-range sound to all four transducers, and you should ALWAYS make these connections.

If your receiver or amplifier does not have a line-level subwoofer output, then you do not need to make any other connections, and you should skip to the section titled “Amplifier Controls.”

Speakers and electronics terminals have corresponding (+) and (–) terminals. It is important to connect both speakers identically: (+) on the speaker to (+) on the amplifier and (–) on the speaker to (–) on the

amplifier. Wiring “out of phase” results in thin sound, weak bass and a poor stereo image. With the advent of multichannel surround sound systems, connecting all of the speakers in your system with the correct polarity remains equally important in order to preserve the proper ambience and directionality of the program material. To use the binding-post speaker terminals, unscrew the collar until the pass-

through hole in the center post is visible under the collar. Insert the bare end of the wire through this hole; then screw the collar down until the connection is tight. The hole in the center of each collar is intended for use with banana-type connectors.

RECEIVER/AMPLIFIER

LEFT S412P

RIGHT S412P

LEFT

RIGHT

Y-Connector

(not included)

LFE IN LFE IN

SUBWOOFER OUT

Each S412PII speaker is also equipped with a line-level Low-Frequency Effects (LFE/Subwoofer) input for superior performance with digital surround formats. The .1 LFE channel contains additional low-frequency information not found in the left- and right-front channels. The LFE input works with the full-range speaker-level input to provide the dynamics and effects that your favorite

filmmakers intended. You will need to use a Y-Connector (not included) with one male connector and two female connectors to connect the line-level subwoofer output on your receiver/amplifier to the LFE/Subwoofer inputs on the S412PII speakers. Plug the male connector into the subwoofer output on your receiver or amplifier, and connect each of the two female connectors to

extension RCA patch cords. Then plug each patch cord into the LFE/Subwoofer input of the left and right S412PII speakers. Note: If your receiver has separate left and right line-level subwoofer (or LFE) output jacks, you do not need to use a Y-Connector.

LINE-LEVEL CONNECTIONS

AMPLIFIER CONTROLS

LFE Level Control: Allows you to adjust the volume of the low-frequency effects/ subwoofer channel to suit your room acoustics or tastes. However, it only affects the LFE signal. If you are not using the LFE input, the LFE level control will not operate.

Configuring Your Receiver:

You should choose the “Large” or “Wide” option for the left- and right-front speakers so that full lowfrequency information will be sent to the S412PII speakers. Make sure that you also configure your receiver for “Subwoofer On” or “LFE On.” In this case, the LFE/Subwoofer signal will consist only of the .1 (bass) channel. The LFE signal level can be adjusted by using the LFE level on the S412PII amplifier panel. For initial setup, you should set the level controls on both speakers at minimum (full counterclockwise rotation). With 5.1, 6.1 or 7.1 source material playing, advance the level controls on each speaker slowly until the desired amount of effects channel is present. This is a rather subjective adjustment and should be made using a variety of program materials.

If you choose, you can use the “Small” or “Narrow” setting on your receiver. In this case, all of the information below 80Hz will be fed to the LFE/ Subwoofer input on the S412PII. Now the level control operates through

out

the entire bass spectrum below 80Hz, not just within the .1 channel portion. This configuration is generally unnecessary but, in certain room-placement conditions, it allows greater bass-level control.

Power Switches: The main “Power” switch is simply marked “On” and “Off.” Turn this switch on to commence operation of the powered amplifier after you have plugged the power cord into an AC outlet. The second switch is labeled “On/Off” and has two positions. Placing the switch in the “Auto” position puts the amplifier in Standby mode. In this mode the speaker will be able to automatically sense an incoming signal, which will trigger it to turn fully on. The speaker will also automatically switch itself back into Standby mode after approximately 10 to 15 minutes have passed without its sensing a signal. We recommend that you leave this switch in the “Auto” position for most applications. If you will be away from home or not using your speakers for an extended period of time, you should turn the speakers off by using the main power switch. The

Manual position will bypass the auto-sensing feature and leave the amplifier on until turned off with the main switch or returned to auto sensing by choosing the auto position.

LED Indicators: When your speaker is turned on but is not receiving a signal, the LEDs on the front of the unit glow red to let you know that your speaker is plugged in. When the speaker is receiving a signal, the LEDs glow green. We have provided a convenient “Green ‘On’ LED” switch on the back panel to allow you to shut off the front LEDs should they interfere with your enjoyment of a movie. This switch has no effect when the LEDs are in red mode.

MANUAL

LFE LEVEL

Min Max

AUTO

OFF

S412PII

LFE IN –

OFF

GREEN “ON”LED

POWER ON/OFF

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

“WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.” “AVERTISSEMENT: POUR PRÉVENIR LES RISQUES D’INCENDIE OU DE CHOC ELECTRIQUE, EVITER D’EXPOSER CET APPAREIL A LA PLUIE OU A L’HUMIDITE.”

This area is designed to become quite warm

during normal operation.

TROUBLESHOOTING

If there is no sound from any of the speakers:

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

• Review proper operation of your receiver/amplifier.

If there is no sound coming from one speaker:

• Check the “Balance” control on your receiver/amplifier.

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

• Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured.

• Make sure no wires are touching other wires or terminals and creating a short circuit.

• Turn off all electronics and switch the speaker in question with one of the other speakers that is working correctly. Turn everything back on, and determine whether the problem is in the same place, i.e., the speaker that was working previously now has no sound and the speaker that was not working now sounds fine; or whether it has moved, i.e., the speaker that was not working still has no sound and the speaker that was working is still fine. If the problem is in the same place, the source of the problem is most likely with your receiver or amplifier, and you should consult the owner’s manual for that product for further information.

If the problem has followed the speaker, consult your dealer for further assistance or, if that is not possible, visit our Web site at www.jbl.com for further information.

If the system plays at low volumes but shuts off as volume is increased:

• Check all wires and connec-

tions between receiver/ amplifier and speakers.

• Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured.

• If more than one pair of main speakers is being used, check the minimum impedance requirements of your receiver/ amplifier.

If there is no (or low) bass output:

• Make sure the polarities (+ and –) of the left and right “Speaker Inputs” are connected properly.

• Make sure that the speaker is plugged into an active electrical outlet and switched on, and that the green LEDs are displayed.

• In Dolby Digital or DTS mode, make sure your receiver/ processor is configured so that the subwoofer and LFE output are enabled.

If you used the LFE input and there is no sound from the subwoofer:

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

• Make sure that the speaker is plugged into an active electrical outlet and switched on, and that the green LEDs are displayed.

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

• Make sure all wires are connected. Review the “Line- Level Connections” section on page 5 of this manual and make sure that a single RCA patch cord is connected to each loudspeaker from the Y-Connector plugged into the receiver/amplifier’s subwoofer output. Make sure none of the speaker wires are frayed, cut or punctured.

• In Dolby Digital or DTS mode, make sure your receiver/ processor is configured so that the subwoofer and LFE output are enabled.

If you are using the S412PII LFE/Subwoofer input and the bass level decreases (instead of increasing) when you turn the LFE/Subwoofer Level knob clockwise:

• Recheck to make sure that your receiver or amplifierspeaker outputs are correctly connected to the S412P

speaker inputs (gold-plated binding posts), (+) to (+) and (–) to (–). The

S412PII(+) terminal has a red stripe and is located on the right-hand side, below the letter “L” of the molded JBL logo, when looking directly at the back of the S412P

• If the wires are connected properly, the confusion may be attributable to the design of your receiver/amplifier. Your unit may have inverting inputs, which reverse the polarity of the signal between the inputs and outputs of the amplifier. To check if this is the case, reverse the speaker connections for

ALL S412P

II’

s in your system (and disconnect any other

speakers in the system) so that the receiver/amplifier’s (+) connector is connected to each S412P

II’s (–) (black stripe)

speaker connector. If you do this and the S412P

II’s function

properly (bass increases as you turn your LFE/Subwoofer levelcontrol knobs clockwise), your receiver/amp uses inverting inputs. This is not a problem. Simply connect all of the speakers in your system the same way, with the receiver or amplifier’s (+) terminal to the speaker’s

(–) terminal, and the

receiver

or amplifier’s (–) terminal to the speaker’s (+) terminal.

+ 16 hidden pages