REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 5 February 2019

JBL 1500 ARRAY SCHEMATIC - 1000WATTS SUBWOOFER - 230 VOLT

JBL 1500 Array schematic - 1000Watts Subwoofer - 230 Volt

Output 1000W
Low-Frequency Transducer W1500H 15" Pulp-cone driver
Frequency Response (-3dB) 25Hz – 400Hz, variable
Crossover Frequencies 40Hz-140Hz HP
Port 4" Flared
Dimensions (H x W x D) 23" x 19-1/2" x 19" (584mm x 495mm x 483mm)
21" (533mm) Deep with grille
Weight 125 lb (57kg)
If you have a Dolby Digital or DTS receiver/processor with a low-frequency effects (LFE) output, set LFE/LP switch to LFE. If you prefer to use the crossover built into the 1500 Array, set the LFE/LP Switch  to LP.
 
Exploded view [Click on the pictures to magnify]
Circuit diagram
Test procedure
General Unit Function (UUT = Unit Under Test)
Switch/Controls:
GAIN control full Counterclockwise (Min)
CROSSOVER (Hz) Full Clockwise (140)
PHASE switch - either position
LFE/LP – LP position
1) From the signal generator, connect one line level (RCA) cable to the Line In jack on the UUT.
2) Turn on generator; adjust to 200mV, 50 Hz.
3) Plug AC power cord in UUT, turn power switch ON.
4) LED should be ON (faceplate). Turn up LEVEL control to full Clockwise (Max).
5) LED should be Green; Bass response should be heard and felt vigorously from woofer and port tube.
6) Turn LEVEL control full Counterclockwise (Min). Turn power switch OFF.
Sweep Function
1) Follow steps 1-5 above, using a sweep generator as a signal source – adjust the generator to 75mV, 50 Hz.
2) Sweep generator from 20Hz to 300Hz. Listen for any rattles, clicks, buzzes or any other noises. 
If any unusual noises are heard, test woofer according to the instructions below.
Driver Function
1) Remove woofer from the enclosure.
2) Check DC resistance of woofer; it should be 5.9 Ω ±10%,
3) Connect a pair of speaker cables to woofer 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 6.0V.
4) Sweep generator from 20Hz to 1kHz. 
Listen to driver for any rubbing, buzzing, or other unusual noises
Posted By: FRANK at 03:00
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