- how much current to run anode? - 2 Updates
- Sansui QRS5500 quadrophonic receiver - 2 Updates
| amdx <nojunk@knology.net>: Jun 28 09:22AM -0500 > Or, close enough. > Peter Wieck > Melrose Park, PA Sometimes it would be nice for an OP to say, Hey, thanks for the help, or you're F'ing nuts and don't have clue. Just something, so we know they didn't get hit by a car! |
| JBI <JBI@ez1.net>: Jun 28 11:33AM -0400 On 06/28/2018 10:22 AM, amdx wrote: > Sometimes it would be nice for an OP to say, Hey, thanks for the help, > or you're F'ing nuts and don't have clue. Just something, so we know > they didn't get hit by a car! Quite right, Thank you ALL! |
| Chuck <ch@dejanews.net>: Jun 27 12:18PM -0500 On Wed, 27 Jun 2018 00:30:50 -0700 (PDT), captainvideo462009@gmail.com wrote: >I really don't see how but could this be some crazy kind of coincidence, or perhaps something associated with the lighting system problem? >The tuner section of the schematic, F-1479-2A shows two meters and one small 6V 100ma lamp. Please correct me if I'm wrong but M705 looks like it could be the signal level meter and M706 looks like it is connected to the discriminator output for station centering. Then there is that small 6 volt 100ma. lamp which is connected off pin 12 of the board. Could that be the stereo lamp? To troubleshoot the signal level problem would M705 simply get a DC output off that HA1120 chip and through the transistor proportional to signal strength? Thanks for any further help. It is very much appreciated. >Lenny Lenny, Does the meter work on AM? If it does then either there is a bad connection from VR2 on the F1479 board to the meter or, more commonly, the potentiometer is faulty. If it doesn't work on AM, either the meter coil is open or the wire to ground or the plus wire from the circuit board is open or C 98 is shorted. Hope one of these hunches is correct. Chuck |
| captainvideo462009@gmail.com: Jun 27 03:43PM -0700 > This is my own receiver. Last year it started taking longer and longer for the protection relay to activate and turn on the speakers I finally took it out of service. I recall that it had no other problems that were evident. I had posted this problem at that time and I think that it was Chuck up in Canada who nailed it immediately. He recommended changing C6 on the protection board and .that resolved the protect relay problem. Now however there is another problem that I never had before. Most of the dial lights including the signal meter light are out and that meter also seems to be inoperative as well. I never had any trouble with any lighting or the signal meter on this receiver. This is a big quadrophonic receiver. The switching is done through the main selector switch and it's a nightmare to get to. A real rats nest. Does anyone who has worked on these recall any common problems with lighting on one of these? I suspect a ground problem because so many of these lamps are in parallel but it's so crowded in that area you can't see anything. I Really appreciate any help. Lenny Chuck I put a remote near the antenna and it does respond to AM. I did see it respond to FM at one point too. But then it didn't seem to after awhile. The thing is I can't find VR2 that you mentioned. Which meter is the signal meter? Lenny |
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