Question about Yamaha STEREO POWER AMPLIFIER 750X2 @4 OHMS - P5000S Car Audio Amplifier

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My yamaha p7000s is dead no voltage to filter capacitors and 6.8 ohm 5w cement resistor keep opened.

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: yamaha p7000s diagram

Yamaha P7000S service manual. It includes the schematic diagram. Click Get Manual.

Posted on Oct 17, 2011

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dburns60
  • 410 Answers

SOURCE: no power to filter capacitors

After switch through relay then down to fuse you should come to a full wave rectifier (solid state vs. tube?). The output of the rectifier goes to the filter caps. example: +30vdc, -30vdc with respect to ground. Best of luck.

Posted on Jul 05, 2009

tech240
  • 169 Answers

SOURCE: need schematic diagram of YAMAHA P7000S

Best find your local dealer as cd are not usually supplied to end users.

Posted on Sep 20, 2009

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1 Answer

Whirlpool microwave keeps opening high voltage diode


If you do not have any experience in the repair of microwave ovens do not engage in their repairs because it is one of the most dangerous household appliances and the consequences can be disastrous. According to your description, low voltage circuit (220V or 110V) works well (light, turntable...). Obviously the problem is in a high voltage (HV) circuit which is made up of the magnetron, HV diode (rectifier), HV capacitor and HV fuse or protect diode. Failure is in any of these components in "HV circuit" or sometimes in interlock switch assembly or PC Board.

First, you must be sure which diode is blowed, reactifier or protect diode.

To check magnetron following this procedure:

Discconect the mains supply.
Check that the capacitor is discharged (by resistor 100 ohm / 10W or more).
Discconect the magnetron.
Measure the resistence between the disconnected terminals (should be app. 0.5 ohm).
Measure the resistance between the supply terminals (both) and earth. The resistance should be infinite.

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Dado

Mar 12, 2015 | Whirlpool MT4155SPS

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Low pass Rf filter


Build your own Rf filter for your output. Wind about 6 turns of enamel coated wire on a straw about "1 inch. Insert a round piece of iron in the center or Iron core(ferrite). Insert capacitors 10-30pf before coil to ground and after coil to ground. I insert 2 capacitors before coil and 2 after coil to ground. The principle is to shunt stray Rf to ground through the capacitors. At the Antenna side add a 100ohm resistor. Its a small Rf filter that should lower SWR and shunt stray Rf to ground, to keep RF from bleeding into Electronics, Neighbors stereos,Tv's and keeps it within all legal power. Use an SWR meter when building this(I recommend a small metal box with 2 female adaptors and a 6" inch Jumper coax.) Get the SWR between 1.1 to 1.5 swr and lock it down. This should also protect you from Lightning and save your transmitter. Ground the metal box heavy to Metal filing cabinets or waterpipes,meterbox, or a 6 ft. rod into earth. Label your box "TX In" and the other end "Antenna"(ANT). Rememeber to use 100 to 500 ohm resistor at Antenna end. Spread coil for max power output and lowest SWR.

on May 03, 2011 | Radio Communications

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Bn41 00521b broken resistor


Yes you can. 5wr15k is 15 ohms resistor with 10% tolerance and 5W r15j is the same with5% tolerance. Good luck.

Dec 11, 2013 | Samsung Televison & Video

1 Answer

Kustom HV65


It is a high power rated ceramic, make sure IF you replace it that you use a 5w or higher. Check the resistance to verify with an ohms meter, it should be 160 ohms or close.

Mar 04, 2013 | Kustom Hv65 High Voltage Series 65w 1x12...

1 Answer

Yamaha p7000s diagram


Yamaha P7000S service manual. It includes the schematic diagram. Click Get Manual.

Oct 17, 2011 | Yamaha P-7000 2-Channel Amplifier

2 Answers

Monitor problem.


um.. im just gona say this it seems obvious but on mine one of the leads connecting the sub to the rest of the cabinet fell off and all i had to do was reconnect it and it was fine.

Aug 11, 2009 | Yamaha NS-A636 Speaker

1 Answer

No cold air


  1. The filter could be dirty This is the most probable cause and, of course, the easiest to check and correct.
  2. The evaporator coil face could be coated with lint,dirt, etc.Dirt or lint on the coil will restrict the flow of air through the coil and the unit must be removed from the recreational vehicle and the soil must be thoroughly cleaned with strong detergent (Coil X,Calclean, etc.) and water. Be sure to protect the fan motor and electrical controls during cleaning by covering them with polyethylene sheet. After the system is cleaned, allow it to thoroughly dry for several hours (before turning it on) to prevent electrical shorts.Before system is put back into operation, be sure the filter is properly installed to prevent recurrence of dirty coil.
  3. No compressor (Does not try to start).The compressor does not run and it does not hum.
    1.The selector switch may be open.
    2. Thermostat may be open.
    3. Overload switch may be open.
    4. Compressor winding may be open.
  4. Selector Switch
  5. Thermostat
  6. Low Voltage
  7. Overload
  8. Compressor
  9. Wiring (Mis-wired)
  10. PTCR or Potential Relay
  11. Start Capacitor
  12. Run Capacitor
To check the selector switch, remove wires from the terminals
and rotate the switch to the proper position and read
continuity as follows:
Terminals Switch Position
L-1-3 Lo Heat
L-1 Lo Fan
L-2 Hi Fan
L-1-4 Lo Cool
L-2-4 Hi Cool


Compressor Motor
The compressor motor is located inside the hermetic
compressor housing and therefore not accessible for service or
visual observation in the field. However, the motor winding
condition can be analyzed by using an ohm meter. Be sure to
remove all the leads from the compressor terminals before
making this check.
1) If the resistance between any two terminals is 0
ohms, the motor windings are shorted.
2) If the resistance between any terminal and the
compressor housing is anything but infinity, the
winding is grounded.
3) If the resistance between any two terminals is
infinity, the winding is open.
On a good compressor, the highest resistance will be between
the R (run) and S (start) terminals. The lowest resistance will
be between the C (common) and R (run) terminals. The
intermediate resistance will be between the C (common) and
S (start) terminals. Notice that compressors have the
identification of the terminals marked on either the terminal
cover or on the compressor housing.

Capacitor Check
There are several capacitor test devices available. The ohm
meter is one of them. The ohm meter cannot verify a
capacitors MFD (microfarrad) value. However, the following
procedures will show you how to use an ohm meter to
determine if the capacitor is good, open, shorted or grounded.
Before testing any capacitor, always perform the following
procedure:
* This test must be done with a analog type meter.
a) Disconnect all electrical power to the air conditioner.
b) Discharge the capacitor with a 20,000 ohm (approx.
3 watt) resistor or larger.
c) You may discharge capacitors with a standard volt
meter if you use a scale over 500 volts and touch the
leads (one lead to each side of the capacitor). The
volt meter will discharge the capacitor.
d) Identify and disconnect the wiring from the
capacitor.
e) Set and zero the ohm meter on the “highest” scale.
When testing for a good, open or shorted capacitor,
perform the following checks: Place the ohm meter
leads across the capacitor terminals (one lead on
each terminal) and perform a continuity test. Then
observe the action of the meter needle or indicator.
Reverse the leads and test again. The result should
be the same. Note: If the capacitor had not been
properly discharged, a false reading could be
indicated on the first test. Always test several times
(reversing the leads with each test). This will verify
the capacitors condition.
Good Capacitor
If the capacitor is good, the indicator will move from infinity
(the left side), towards zero ohms and slowly return back to
infinity. Reverse the leads and test again. The result should
be the same.

Start Capacitor
Most models use a start capacitor and a start relay to give the
compressor high starting torque. The compressor will,
therefore, start against normal pressure difference (head
pressure minus suction pressure) even when shut down for a
short period of time. The start relay will disconnect the start
capacitor when the motor reaches approximately 75%
running speed.
Start (Potential) Relay
The start relay consists of –
1) Normally closed contacts internally between
terminals #1 and #2 which switch in the start
capacitor in parallel to the run capacitor during shut
down and then switch out the start capacitor when
the motor reaches approximately 75% normal
running speed.
2) A high voltage coil internally between terminals #5
and #2 to actuate the contacts. The coil is too weak
on line voltage to actuate the contacts, but it is
connected in series with the start winding and it gets
the generated voltage of the start winding portion of
the compressor motor. This generated voltage is
much higher than line voltage and varies with the
speed of the motor. Therefore, since the relay is
designed to open the contacts at 75% of normal
running voltage (measured between terminals #5 and
#2), the contacts will open (thus disconnect the start
capacitor) at approximately 75% of normal running
speed.
(B) Positive Temperature Coefficient Resistor
(Commonly Known As PTCR Start
Device)
The resistor acts like a potential relay in that it takes the start
capacitor out of the start circuit, but uses resistance of
electrical flow (back EMF from compressor) instead of
opening a set of contacts. The service person should be careful
handling the resistors. They will be hot during operation (up
to 160 degrees F). The air conditioner needs to be off for 3-5
minutes during cycle time and when servicing to let the
resistor cool down.

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That covers everthing.
Please rate this a fixya

Feb 09, 2009 | Coleman Mach III Air Conditioner

1 Answer

Not fixed.


I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Your voltage measurements for the resistors are correct. The regulators should be fine. Remember that the pins that you are checking come before the regulators. I would double check these capacitors that I am referring to. Do you have the schematic for this? If you need it I have a copy. The transformer has multiple taps coming off of it. You cam check the other resistors, but I'm sure that they will be fine. I suspect the caps.

Jul 07, 2008 | Harman Kardon AVR 335 Receiver

1 Answer

Repair 74cm TV Power Supply


hi there, check the bleder resistor, it was 100 kilo ohms or up, near the biggest capacitor at the power supply. do some test and check up. ty

Feb 16, 2008 | Televison & Video

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