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Messages - FenderDeluxe112Plus

#1
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 29, 2022, 05:07:36 PM
Thanks a lot for this - will start working through this over the next few weeks.
#2
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 26, 2022, 03:12:56 PM
Thanks for your help Phil-  I will have another look at the power amp- will pull the heatsink diodes cr6-8, plus cr10/12 and check the electrolytic caps.
If anyone has any ideas about how to track this fault down, I would be glad to hear them. Thanks, Andy
#3
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 25, 2022, 11:10:25 AM
Ac across speaker leads 4.5vac
#4
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 25, 2022, 11:05:47 AM
Tps 1-6 check out as per schematic

But excess ac still present on tp4
Ac on tp3 0.068
Ac on tp4 0.235




#5
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 25, 2022, 10:47:01 AM
New main filter caps and psu diodes
Cr22- 25 replaced.
Buzz still there. 
#6
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 05, 2022, 12:52:02 PM
Thanks Phil,
I will take another look at cr22-25.
Do the readings for those diodes in post #112 look off?

 With the buzz still present with r82 lifted does it narrow the fault down to the power supply?
#7
Amplifier Discussion / Re: Fender 112 Deluxe Plus
September 03, 2022, 10:57:07 AM
Buzz still present with r82 lifted.
#8
Amplifier Discussion / Re: Fender 112 Deluxe Plus
August 31, 2022, 03:12:02 PM
With regard to ac in signal path - should I expect to read similar vac measurements between cp1 and ground and cp2 and ground when nothing is plugged into the headphone jack?
#9
Amplifier Discussion / Re: Fender 112 Deluxe Plus
August 31, 2022, 10:19:00 AM
Diodes around u4 18-21 tested good.
C44 51 and 52 tested good.
I haven't yet lifted r82 but will do so.






#10
Amplifier Discussion / Re: Fender 112 Deluxe Plus
August 23, 2022, 10:43:36 AM
Cr22,24 and 25 all have forward voltage of 0.5v or slightly above and read infinitely with leads reversed.
Cr23 slightly lower hovering around 0.47v and reads infinitely with leads reversed.
#11
Amplifier Discussion / Re: Fender 112 Deluxe Plus
July 24, 2022, 10:09:07 AM
Thanks Phil,

This is the method I have been using so far, I thought there might be other ways to test in circuit.
#12
Amplifier Discussion / Re: Fender 112 Deluxe Plus
July 24, 2022, 02:57:03 AM
Thanks Enzo,

Where would be the next logical points to test?
#13
Amplifier Discussion / Re: Fender 112 Deluxe Plus
July 23, 2022, 03:29:19 PM
I am reading 30.00vac at r82. Does this   suggest the rectifiers are faulty? You cannot view this attachment.
#14
Amplifier Discussion / Re: Fender 112 Deluxe Plus
July 20, 2022, 10:24:31 AM
Just ran the preamp out into another amp. The buzz is there but it is quieter now and does not sound like the previous 100hz hum.
With the main filter caps replaced, could the next suspects be diodes breaking down under load in the power supply?
#15
Amplifier Discussion / Re: Fender 112 Deluxe Plus
July 20, 2022, 04:57:05 AM
Checked the ac on speaker 3.59vac
It drops to 1.32 wiith a jumper from cr3 anode to ground.