JBL TLXPS-12 Service manual

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S E R V I C E M A N U A L

TLX PS12

Discrete Output, High Current

12" Powered Subwoofer

JBL Consumer Products Inc.

250 Crossways Park Drive

Woodbury, N.Y. 11797

A Harman International Company

1112-TLXPS12 Rev A

Powered Subwoofer TLX PS12

TABLE OF CONTENTS

Specifications .................................................................	1	Block Diagram ................................................................	7
Warranty .........................................................................	2	Amplifier Exploded View ................................................	8
Safety Symbols ..............................................................	2	Cabinet Exploded View..................................................	9
Controls and Their Functions.........................................	3	Parts Lists.....................................................................	10
Test Procedure...............................................................	4	Packaging and Shipping ..............................................	12
Trouble Shooting Before Opening .................................	5	Integrated Circuit Diagrams .........................................	13
Removing the Amplifier..................................................	5	Printed Circuit Boards .................................................	14
Trouble Shooting After Removal ...................................	5	Schematic Diagrams ...................................................	16
Components Requiring Exact Replacement..................	6

SPECIFICATIONS

Amplifier Power RMS . . . . . . . . . . .	120 Watts
Drivers . . . . . . . . . . . . . . . .	12" with high-polymer-laminated cones
Inputs . . . . . . . . . . . . . . . .	Line level and Speaker Level
Outputs* . . . . . . . . . . . . . . .	High level with High-Pass filter at 180Hz
Crossover Frequency . . . . . . . . . . . 50-150Hz
(continuosly variable)
Frequency Response . . . . . . . . . . .	23Hz to (50-150Hz)
(-6dB)
External Dimensions (Inches)
Height . . . . . . . . . . . . . . . .	19 3/4"
Width . . . . . . . . . . . . . . . .	15"
Depth . . . . . . . . . . . . . . . .	16 3/4"
Weight . . . . . . . . . . . . . . . . 43 lbs
Shipping Weight . . . . . . . . . . . . .	49 lbs
External Dimensions (mm)
Height . . . . . . . . . . . . . . . .	502 mm
Width . . . . . . . . . . . . . . . .	381 mm
Depth . . . . . . . . . . . . . . . .	426 mm
Weight . . . . . . . . . . . . . . . . 19.5 kg
Shipping Weight . . . . . . . . . . . . .	22.3 kg

* High-Level (speaker) outputs are active only if high-level input are used.

Occasional refinements may be made to existing products without notice, but will always meet or exceed original specifications unless otherwise stated.

Powered Subwoofer		TLX PS12

WARRANTY

This amplifier is warranted against defects in material and workmanship for a period of one year from date of shipment, when installed in accordance with the owner’s manual in a clean, dry, interior home environment. THIS AMPLIFIER IS NOT SUITABLE FOR OPERATION OUTSIDE OR IN HARSH ENVIRONMENTS. During the warranty period, the manufacturer will, at its option, either repair of replace products which prove to be defective.

For warranty service or repair, this product must be properly packed and returned to a service facility designated by the manufacturer. Buyer shall prepay shipping charges to the designated facility and the manufacturer shall pay shipping charges to return the product to buyer. However, Buyer shall pay all shipping charges, duties and taxes for products returned to the manufacturer from another country.

The manufacturer does not warrant that the operation of the product will be uninterrupted or error-free. The Buyer must determine the suitability of the product for his or her purposes.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied interfacing, unauthorized modification or misuse, operation outside of the environment specifications for the product including inadequate ventilation, or improper site preparation, installation, or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. THE MANUFACTURER SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. THE MANUFACTURER SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

SAFETY SYMBOLS

The following symbols are used throughout this manual and in the product. Familiarize yourself with each of the symbols and its meaning before servicing this amplifier.

Instruction manual symbol. The product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect the unit against damage.

Indicates dangerous voltages are present. Be extremely careful.

The CAUTION sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or

destruction of the amplifier. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

The WARNING sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to could

result in injury or loss of life. Do not proceed beyond a

WARNING sign until the indicated conditions are fully understood and met.

GENERAL SAFETY CONSIDERATIONS

THIS UNIT DOES NOT HAVE A POWER SWITCH; HAZARDOUS VOLTAGES ARE PRESENT WITHIN THE UNIT WHENEVER IT IS PLUGGED IN. This still applies when the over-temperature thermostat opens, as it may automatically reset at any time.

There are voltages and hot components at many points in the amplifier which can, if contacted, cause serious injury. Be extremely careful. Any adjustments or service procedures that require operation of the amplifier out of its enclosure should be performed only by trained service personnel.

Powered Subwoofer		TLX PS12

CONTROLS AND THEIR FUNCTION

1.Output Level - The Output Level adjustment determines volume level strength.

2.Crossover Frequency - The Crossover Frequency adjustment determines the highest frequency the TLX PS10 will reproduce. It allows a seamless transition from the subwoofer to the satellite speakers.

3.On (LED) - This LED will light green when the unit is plugged in and is receiving signal. When in standby mode the LED is red.

4.Low Level Input - These left and right Line Level Inputs are normally used when the receiver/ processor has line-level “pre-amp out” or subwoofer out” jacks.

5.Phase Switch - The Phase switch is used to adjust the relative polarity of the subwoofer. Normally this switch is set to “0”.

6.High Level Inputs - These High Level Inputs are for receivers that don’t have line-level “pre-amp out” or “subwoofer out” jacks. When a pair of main or satellite speakers are attached to the OUTPUT terminals, frequencies below 180 Hz are attenuated by the high-pass filter.

7.Fuse - Use only a slow-blo 2.0A 250V GMC fuse.

Powered Subwoofer		TLX PS12

TEST PROCEDURES

General Function

UUT = Unit Under Test

1.Connect both right and left line level inputs (RCA) to signal generator and UUT. Use Y-cable if necessary from mono source. VOLUME control should be full counterclockwise.

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

3.Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise.

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

5.Turn off generator, turn VOLUME control fully counterclockwise, 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 2.0V, 50 Hz. Turn VOLUME control full clockwise.

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 3.3 ohms.

3.Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on 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.

Powered Subwoofer				TLX PS12

BEFORE THIS AMPLIFIER IS PLUGGED IN, make sure its rated voltage corresponds to the voltage of the AC power source to be employed. Failure to use the correct voltage could cause damage to the amplifier when the AC power cable is plugged in. Do not exceed the rated voltage by more than 10%; operation below 90% will degrade performance or cause the unit to shut off.

1. TROUBLE SHOOTING BEFORE OPENING

Check connections, control settings, driver and other possible external problems. If there is Output, determine if all controls and Inputs function properly. Rotate Pots over full range while applying lateral and vertical oscillating forces to locate possible intermittent function. High Level Inputs should be tested individually both differentially (signal from "-" to "+" with normal output) and in common mode (signal from low level ground to both "+" and "-" shorted together, giving virtually no output). While passing a signal, corner drop the enclosure a few inches to expose possible intermittent problems. Check woofer for rubbing of voice coil or tears in cone or surround. Check cabinet for loose extraneous articles which may have been pushed into front port.

If line core, its strain relief, or the AC switch are replaced, it is necessary to seal them completely to panel with an approved conformal coating to prevent air "whistling" through any openings from woofer pressure.

To reduce the risk or electric shock and/or fire, replace items as marked on schematic with the safety marking only with the exact replacements listed in the safety component

list, section 5. If exact replacements are not available, order them from the factory or an authorized service center.

2. REMOVING THE AMPLIFIER.

There are voltages and hot components at many points in the amplifier which can, if contacted, cause personal injury. Be extremely careful. Any adjustments or service procedures that require operation of the amplifier out of its enclosure should be performed only by trained service personnel. Refer to PCB drawings for locations of hazards and familiarize yourself with their locations before starting.

3. TROUBLE SHOOTING AFTER REMOVAL

Verify AC plug is disconnected See WARNINGS in section 2.

To prevent loose hardware from reducing safety spacings, it is essential that all hardware be replaced in the same manner as it was removed, with lock washers under all nuts, proper torque on screws and thread locking sealer on the transformer nuts.

A.) Check fuse F1. If blown visually check transformer for discoloration, and large capacitors (C36, C37) for bulges or venting. Check for shorts in Q3-Q7 with an Ohmmeter, (see schematic).

B.With ohmmeter, verify contacts of thermostat are closed, voice coil of woofer is 3.3 ohms, and windings of transformer are continuous.

C.Examine board and wiring for obvious damage, broken or poorly soldered connections, or discoloration.

D.Repair or replace items identified above. Procedures for replacing power transistors and removing PCB are as follows:

Use low power, grounded temperature regulated iron with small tip such as Weller PTA7 and ESD control. Use SN63/37 solder 0.032" diameter with "no clean" flux core, Alpha Metals P2 or equal.

I)Replacing power transistors: Clip all 3 leads near body of transistor. Remove screw and discard device (keep hardware and insulator). Holding each lead in turn with needle nose

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