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I have a Scott LT112B that was working fine for about 10 months. Then we had a power supply problem which is now fixed. The IF always was working well. Today analyzing the RF section, there is this 10.7Mhz transformer right after the mixer. OK we are at 3.5 divisions with a 400hz modulation on...

So I have aquired a Scott LT112 and it does not go into stereo. Have pretty much replaced the known bad parts on the MPX board which include ceramic capacitors. Am now on the IF board where bad capacitors and transistors abound. Noteworthy is that the center channel meter is about 250mv skewed...

I have a Scott LT111 aka 370 and it tunes from 98.7 to 107.9 Mhz a span of 9.2 Mhz. All the values are correct for the oscillator circuit as far as capacitance values. I have no idea why it will not tune a span of 20mhz like it should. I would like it to tune 88 to 108Mhz.

I am the proud owner of a Pioneer SX2500. A few days ago, repaired the L channel as it was straight forward. What is not straightforward is the autotuning feature. The motor runs back and forth as does the dial pointer without stopping on stations.I do receive about 48 stations in stereo if the...

Please help OK we have 51 stations in mono, but no FM stereo. I assume that since we have so many stations in mono, that we have enough signal strength, but it is anywhere from 0 to 2 bars. The peak on Am is 3 bars. However the MPX frequency at pin 2 of the MPX chip (HA1120) is measured at...

Please help! Offset set to zero but unable to set bias appropriately -------------------------------------------------------------------------------- when dc offset adjusts, yet idle current doesn't - differential voltage reading are your friend. measure across the bases of the driver's...

Try for AM; J114 has output but just on one channel. Base of H105 has output, base of H104 dead, base of H103 dead, base of H102 dead, base of H101 dead. H107 non striped conducts test signal, and cathode conducts signal just barely. H104 collector dead. Now check the L102 primaries and...

No signal at base of H204. Check gain of transistors H201-H204 (2sc829) now with trusty Sencore Cricket. Power down. H201 good with gain over 500! H202 bad 2sc829 cross references to NTE85 which cross references to KSC1845 H203 bad 2sc829 cross references to NTE85 which cross references to...

J407 and J408 have signal but super weak! This is the output of the MPX stereo decoding amp. Inject at the base of H410, super weak! Inject at the base of H411, reasonable tone! Signal inject at bases of H406; dead and H407; dead like a dying transistor. Check gain of H101-H105 and H406-H411...

Input to power amp is J701. Try 400Hz sine wave, nice clean output! J702 no output, yes this is verified. R channel is dead at J702! But the R and L are interpolated on the schematic? Check J716 again for half b plus. 21.8 volts mislabeled. R channel is actually fed from J716. Injected at base...

Pioneer SX-550 receiver no fm stereo; please help -------------------------------------------------------------------------------- Pioneer SX 550 6-12-14 5-12-14 No shorts no dangerous leakage currents 38 stations but no stereo as alluded to in description HA1156 is suspect NTE801...

Pioneer SX 550 6-12-14 5-12-14 No shorts no dangerous leakage currents 38 stations but no stereo as alluded to in description HA1156 is suspect NTE801; but I have a spare HA1156! All voltages are good on the HA1156 making overt failure less likely. Q6 checks good. However the voltages on...

Replaced a few preamp transistors that were bad ie 2SA726 transistors and a 47uf capacitor in the power supply to finish the shotgunning of the power supply. Hooked it up and no output on both channels:no:! Is this a preamp or power amp issue? It is a preamp issue as the power amp works fine...

Pioneer SA 9800 just shotgunned the AWR-194 power supply board and both speakers move in and then out in an 8 second time period. The power meters display this aberrancy at about 1 milliwatt of power. Details of amp: Mounted Humongo heatsink to Q12 with insulating washer, no shorts...

Pioneer SA9800 1-11-14 Fluoroscan is dead and no sound Powers up on variac fine. Out of protection, and voltages across L and R channels are good. Flouroscan is dead The below is per Mark the fixer sa-9800 sa9800 display troubleshooting Here's the "from there": Check the power supply...

Pioneer SA9800 1-11-14 Fluoroscan is dead and no sound Powers up on variac fine. Out of protection, and voltages across L and R channels are good. Flouroscan is dead The below is per Mark the fixer sa-9800 sa9800 display troubleshooting Here's the "from there": Check the power supply...