i just tested for the +/-15 volts, the -15 is there, the +15v is not there (zero)
i tested at that white connector
thanks
what next?
Attached Files
-
you are both correct
i just tested for the +/-15 volts, the -15 is there, the +15v is not there (zero)
i tested at that white connector
thanks
what next? -
correction, the LED all working fine, i thought it was bad but the direct switch was on , so that automatically disables the loudness switch all together along with its led
so again the leds are ok
do u still think that the +/- 15v is gone?
plz let me know where i should test for that
i really wish some1 helps me out
i did test many transistors on 2 boards and nothing that i found bad
the problem is that the online service manual is not helpful due to a bad scan
so i really wish for help here
thanks in advanceLeave a comment:
-
I can't make sense out of what was done. A205 uses JFET switches for the loudness mode, 1/2 the DPDT switch is for the LED.
But likely shorted the +/-15V rails causing the end. Resistors 4.7R should have fused at the Vreg inputs.
cross-posted: https://forum.allaboutcircuits.com/t...-i-made.200661Leave a comment:
-
You should not have done that, you likely damaged either the +15 or -15 volt supply, I would suspect the +15 volts is bad, One side of the dpdt switch controls the led so connecting its pins shorted out the led, the other side of the dpdt switch shorted the -15 and the +15 togetherLeave a comment:
-
Pioneer amplifier A-205 Relay not clicking after a mistake i made
Hello guys
Because the unit is old (but only occasionally used) the loudness button causes some noise due to bad contact,
sprays did not work, so i decided to solder the pins that it connects on the pcb at the on (loudness on) position
i did that and it worked fine, i know from the bottom of my heart that the switch connects 2 pins and also d/c other 2 pins
on every position it have (6 pin switch), so i was curious what would happen if i clicked the switch off while the pins are soldered at on (so basiclly on and off at the same time), when i did so the sound is gone, nothing blew
all lights are on normally, except that the unit does not click its relay anymore and ofcourse no sound
the loudness led is not responding also
where the problem could be?
hope to find help here
thanks in advance
-
Hi, I'm seeing one 9V relay having temperature 40C on its 9V (primary) side. Does that seem right? I switched 2 relays on that board and the temperature was the same (on the same position), so I'm sure it's not a faulty relay. I measured voltage on that relay and it was 9.5V DC, so that looks good. I don't see any other relay on that board having that kind of temperature and they have 9V on them too.
I thought maybe the transistor that is switching this relay keeps switching on/off, so I also checked for AC and there was almost none: 0.3V using mV range. No steady frequency was shown, but... -
Hi everyone!
I have this board that suddenly stopped supplying power to an output that drives an interchanger cleaner motor.
I checked while the board was in place with all wires attached and there's no AC voltage on the corresponding plug X5
This X5 is driven by fuse F8 (tested OK) which comes from the second orange relay
To make sure there are no charcoaled contacts inside the relay, I got a 24VDC power supply and got it ready to manually power up the coil side of these relays.
I respected the polarity, positive to cathode of protecting diode
So provided all... -
I was working on this CNC machine today found no keyboard functioning no control relay powering on
The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board
Found shorted diodes on main controller relays there are 3 of them that... -
Hi folks,
New audio equipment repair and I could use some help.
Picked up VSX-523-K Surround sound amplifer.
Upon power up for the first time (been sitting for a while) loud popping noise and smoke..
Disconnected, opened up and found many popped caps on the amplifier board.
Replaced all, replaced A992 BJT, and pre-amp transistor and power transistor. I found 0.47 Ohm resistors that are blown or have gone High impedance and I'd like to replace.
On the service manual, it shows these as 0R47(2) (assuming this is a 0.47 Ohm, 2W?)... -
My childhood best friend was killed about 9 years ago. His parents are finally letting go of his things, and they offered me his Polk RTi100 tower speakers. The Polk RTi100 towers are one of a handful of designs from the early 2000s that is a full range 3-way tower with a built-in self-powered subwoofer. This is accomplished with a plate amp integrated into the speaker input panel.
I think they used them for a while, but they've been sitting for at least a few years now. After about 40 hours of driving to their house and back (both they and I have moved in the last 9 years) I got...
Leave a comment: