FRANKPIETTE
Member
Hello everyone,
Hi recently got a Marantz 2245 in a near NOS state. It never collected dust. So first thing i did was to check the connections at J018 terminal block for AC voltage selections to verify it was hoooked for 120V and that the back panel fuse value for 120V (3A). So with my Variac and DBT. Started at 0VAC up to 115, the relay had clicked previously around 90VAC and noticed that at 115VAC i got a dimmed glow on the bulb filament. I used a 100w bulb. Went to turn it off when i touched the faceplace, i got a little tickeling of AC. Put the black lead in the ground outlet and it measured 9-10 VAC leaking. Let it at 115VAC and listened to it an played fine. All pots were amazing like new no noise or else.
First thing i wanted to check was the big snubber cap+resistor .1uF/120Ohms 500V (Installed) *SM capacitance is wrong it shows .056uF. at Jthe 4 terminal lug Also there's the 2.2 MOhm resistor on the same terminal that goes to ground. The old Carbon resistor was still in spec. The capacitor was more than 30% over it's capacitance. So waited for the part then I replaced it with a Kemet .1uF/100Ohms (couldn't find any at 120Ohms). So i replace both, resistor too, for a different compo. Hooked back the 2 wires, one at the back panel fuse 2 wire connector the other one right after the unswitched outlet. Started at 0VAC again then got a good short around 30-35VAC from the variac. So i unplugged it emptied the main caps removed my 2 wire from where i just soldered them. Just tested it Cap and resistor not in circuit, and still got a short at the exact same voltage 30-35VAC on the V. I checked all wires around where i unsoldered and resoldered, nothing to see there, still like new. So decided to remove all four output transistors at that stage, since it's my number one culprit for death shorts, have to replace thermal compound anyway. Still a short at 35VAC input with the big snubber unplugged, all for output transistors out. Tested the bridge rectifier in diode mode still good, i got .450V on each AC connector in and almost .9V measuring from both DC connector (double V). And OL everywhere changing probes order. Nobody touched it while waiting for the parts i added to an existing order. So had a dimmed glow at DBT at 115V with AC on the chassis, was playing on all all sources but haven't connected a TT for the basic tests. And still shorting. I don't have my ESR meter here unfortunaly but i removed the 2 main caps, until. Since it's a universial 5 voltages unit i prefer to ask you Wizards of the Forum first. Anyone needs a short for free? Thank you for reading this! Happy Halloween!
Also there's an error in the SM the main Caps are 9000uF not 6800 voltage good
Hi recently got a Marantz 2245 in a near NOS state. It never collected dust. So first thing i did was to check the connections at J018 terminal block for AC voltage selections to verify it was hoooked for 120V and that the back panel fuse value for 120V (3A). So with my Variac and DBT. Started at 0VAC up to 115, the relay had clicked previously around 90VAC and noticed that at 115VAC i got a dimmed glow on the bulb filament. I used a 100w bulb. Went to turn it off when i touched the faceplace, i got a little tickeling of AC. Put the black lead in the ground outlet and it measured 9-10 VAC leaking. Let it at 115VAC and listened to it an played fine. All pots were amazing like new no noise or else.
First thing i wanted to check was the big snubber cap+resistor .1uF/120Ohms 500V (Installed) *SM capacitance is wrong it shows .056uF. at Jthe 4 terminal lug Also there's the 2.2 MOhm resistor on the same terminal that goes to ground. The old Carbon resistor was still in spec. The capacitor was more than 30% over it's capacitance. So waited for the part then I replaced it with a Kemet .1uF/100Ohms (couldn't find any at 120Ohms). So i replace both, resistor too, for a different compo. Hooked back the 2 wires, one at the back panel fuse 2 wire connector the other one right after the unswitched outlet. Started at 0VAC again then got a good short around 30-35VAC from the variac. So i unplugged it emptied the main caps removed my 2 wire from where i just soldered them. Just tested it Cap and resistor not in circuit, and still got a short at the exact same voltage 30-35VAC on the V. I checked all wires around where i unsoldered and resoldered, nothing to see there, still like new. So decided to remove all four output transistors at that stage, since it's my number one culprit for death shorts, have to replace thermal compound anyway. Still a short at 35VAC input with the big snubber unplugged, all for output transistors out. Tested the bridge rectifier in diode mode still good, i got .450V on each AC connector in and almost .9V measuring from both DC connector (double V). And OL everywhere changing probes order. Nobody touched it while waiting for the parts i added to an existing order. So had a dimmed glow at DBT at 115V with AC on the chassis, was playing on all all sources but haven't connected a TT for the basic tests. And still shorting. I don't have my ESR meter here unfortunaly but i removed the 2 main caps, until. Since it's a universial 5 voltages unit i prefer to ask you Wizards of the Forum first. Anyone needs a short for free? Thank you for reading this! Happy Halloween!
Also there's an error in the SM the main Caps are 9000uF not 6800 voltage good
