Marantz 2600 FM scope display problem

[Halisson]

Hey, guys,
audiokarma taught me a lot many times. I am grateful for all the help I have ever received.
I'm having a problem with a Marantz 2600 that I really don't know what else to do.
The device arrived with a burnt transformer, problems with the FM stereo (after changing the (q301)HA1156w, stereo light on, 19khz on), then difficulty displaying the FM scope via Display Tunning or Multipath (I changed QR51-Upa63h to Upa68h ) and it was good. Upper and lower L201 coil, service manual specification, fine.
Scope alignment was done using 3cm horizontally and vertically with 150mv, and that's fine, aux for example.
Scope->Multipath and Tuning, AM and FM mode, and everything was fine.
Scope->Audio, Phono, Aux mode, AM mode, and that's fine.
Scope->Audio FM/FM 25us, in reverse or stereo modes, tilt and incorrect display.
Scope->Audio FM/FM 25us, in L+R,L OR R mode, screen tilt is ok.
You may notice a slight difference in L and R, see images.
I am attaching a photo of the modes and what I have here.
Several of the P200's capacitors have been replaced, FM tuning is excellent, and the stereo runs nice and strong (like other Marantz 2500s and 2385s).
Adjusting the R319, I get the two output levels (monitor out 1), the same levels and the same phase. Q302,303 and 304 have been replaced.
As described, use on FM or FM25us does not change the symptom of the problem. Quartz lock working well, including mute/quartz function.
It's a device that went through another technician, I'm fixing what I see.
I appreciate his help.

 

[Halisson]

I'd like to share with you what I've done lately and how I arrived at the solution.
I left the device aside a little to think about where I could start, because I couldn't find which block was the problem.
The first step I followed was a broken cable or cold solder, I redid some points but I didn't find a defect.
On the top of the P200 board, there is an orange shielded cable that connects the J238 to the PC01 (FM Buffer Amp), so I disconnected the pink and white cable and identified that it was not from this point on, but before on the P200 board (AM Tuner , FM IF / MPX board), when reversing the cables and the problem migrated laterally and when skipping the white with the pink on one of the terminals, the scope aligned correctly.
Then I followed from the end to the beginning, after the LPF resistors (r322 and 323, 3k, but the two were the same), the capacitors C316/C317 were new and the polarity was correct, without problem apparent on the capacitors c313, c311, c312 and c314. Q302 and Q303 are new, so I identify R316 and R317 with a value of 3.3k however... see the photo, the resistor R316 is broken and when touched it is broken in half. I made the switch and it worked fine.
I left the testimony for anyone going through the same problem, be able to track it with my small contribution.

 

[rBuckner]

Wow, way to stick with it and find that!

 

[Halisson]

Wow, way to stick with it and find that!

The maintenance of this model of receiver always gives shivers, nightmares during the night but the result is always interesting