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Old 2nd October 2006, 12:37 PM   #1
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Default kenwood 9102d

working on a kenwood 9102d amp it doesnt do anything doesnt power up no output checked all the power supply transistors and checked outputs they are all fine just wondering it has a coil on the amp or maybe its a transformer in the power supply could that have gone bad?? how do i tell if thats the problem or what else do i check??
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Old 2nd October 2006, 04:36 PM   #2
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As with any amp that will not power up, you need to check the voltage on the pins of the power supply driver IC (TLx94, SG352x...). This will tell you if the amp is in protection, or if the IC isn't getting the required voltage/inputs to allow the power supply to operate.

If you don't know what you're supposed to have on the various pins, post the part number of the IC and the voltage on each pin. Set your meter to DC volts. Place the black meter lead on the amp's ground terminal for all readings. The amp should have +B and remote applied. Be careful not to let the meter's probe slip and short between terminals.
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Old 5th October 2006, 10:56 AM   #3
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the part is tl4941 working right to left if the chip is in front of u bottom row pin 1 is 0 pin 2=.05 pin3=.05 pin4=.19 pin5=1.19 pin6=3.00 pin7=0 pin8=5.32 top row pin1=0 pin2=4.38 pin3=4.38 pin4=4.38 pin5= 5.28 pin6 =5.28 pin7=2.20 pin8=2.20


wondering if this chip is bad or what please help me out and let me know i appericate all the help
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Old 5th October 2006, 03:14 PM   #4
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Download this and notice how the pins are numbered.


http://focus.ti.com/lit/ds/symlink/tl494.pdf

There is insufficient voltage on pins 8, 11 and 12. The IC seems to be working and the amp would likely power up if you restore the voltage supply to those pins. The voltage is likely supplied by a PNP transistor. If so, the 'input' of the transistor will on pin 1 (emitter). The output to the IC will be on pin 2 (collector). This assumes that the transistor is in a to-92 style case (or similar).
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Old 5th October 2006, 04:57 PM   #5
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it looks like the transistors that supply voltage to pins 1 and 2 are like the mmbt3906 but there is no marking on theese transistors and no board locations just wondering what i might be able to do to find out what parts to buy to replace theese because when i check them i get no reading at all on the 2 transistors
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Old 5th October 2006, 09:07 PM   #6
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If all else fails, you can order a service manual for the amp. It will have the part numbers.

The transistor in question would supply voltage to pins 8, 11 and 12. Not pins 1 and 2 of the IC.

Kenwood uses 'digital' transistors that have built in biasing resistors. These can be difficult to check. The transistor that's going to be used to supply voltage to the 494 is going to be a standard transistor which should be easy to check (although you may have to remove it from the board to do so definitively).

Are you sure that there are no markings?

Use a lighted magnifying glass to be sure. You can also apply a tiny bit of heatsink compound to the top of the transistor then wipe it off. It will remain in the etched markings and will make it easier to read the numbers.
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Old 7th October 2006, 07:26 PM   #7
docfin is offline docfin  Europe
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Service manual for Kenwood KAC-9102D available here: http://service-manuals.webs.io/
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Old 7th October 2006, 08:00 PM   #8
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mike49504:

Measure the DC voltage on the pins of Q3. Black meter lead on the ground terminal of the amp.

With power and remote applied to the amp, pin 1 of Q3 should have the same voltage as the B+ terminal.

The middle pin should have approximately 0.1 v less than pin 1.

Pin 3 of Q3 should have ~0.6 volts less than pin 1 of Q3.


docfin:

Thanks for the quick delivery.
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Old 17th October 2006, 10:17 PM   #9
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i fix the problem with the power supply amp comes on and stays on but there no output and all the outputs check fine where do i go from there what else should i check?
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Old 17th October 2006, 11:01 PM   #10
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What did you find wrong with the power supply?

Do you have an oscilloscope?
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