Marantz 140

[Boogies1018]

I bought a model 140 knowing it had a power problem. I’ve restored my 2230 and now I’m diving into this. It blows the fuse as soon as you apply power. I’ve been reading about the protection relay causing power problems but I haven’t seen anything about blowing fuses.

 

[Steven Tate]

I wouldn’t power up again without a dim bulb tester. Others should be able to help you track it down. I haven’t worked on a 140, but if it’s easy to disconnect the power to the amp boards, you could start by disconnecting one at a time to see if one amp is the source of the problem - possibly shorted outputs?

 

[Boogies1018]

Im not. I pulled the amps out and was doing some cleanup it’s really dusty inside looking for anything burnt or swollen.

 

[goldswimmerb]

I wouldn’t power up again without a dim bulb tester. Others should be able to help you track it down. I haven’t worked on a 140, but if it’s easy to disconnect the power to the amp boards, you could start by disconnecting one at a time to see if one amp is the source of the problem - possibly shorted outputs?

Amp boards are super easy in the 140, two Molex style connectors and two wires with female connectors. If I recall Its also 6 or 8 screws holding them int the sides. Was one of the easiest units I've worked on.

 

[Boogies1018]

Well my left amp has the short somewhere. Now at least I have a starting point

 

[wlhd1610]

Well my left amp has the short somewhere. Now at least I have a starting point

Start by checking the two output transistors.


Bob

 

[thxdave]

I'll be watching with great interest as I have a line on a nice 140 in its' wood case. ;-)

 

[Boogies1018]

I found a cracked and leaked cap at C702. Whats the preferred method of cleaning up the mess?

 

[goldswimmerb]

I found a cracked and leaked cap at C702. Whats the preferred method of cleaning up the mess?

I usually go with a Q tip and isopropyl.

 

[rBuckner]

^^^ That and apply proper alcohol to the Q-tip operator!!