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Marantz 1030

speedycoolda said:
H713 to R729 both ways reads 130.5 from pin 2 & 3 to the one side of the diode pin 1 to the other side reads 000.1
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This statement above does not match your diagram below. Your blue arrow shows pin 1 of the VR to H713 (black band).
  • Your label says "pin 2 &3, 139.5 both ways"
  • Your blue arrow shows Pin 1 to J713 which are connected by the board trace, so it should read 0 Ohms.
  • Similar to the other side where Pin 3 is connected to the other side of H713 and reads 0 Ohms.
  • But what you should be measuring is this:
    • Black lead on Pin 1, Red lead on Pin 3. Read Ohms.
    • Black lead on Pin 3, Red lead on Pin 1. Read Ohms.
1792266493291.png1792267013330.png
 
dankik said:
This statement above does not match your diagram below. Your blue arrow shows pin 1 of the VR to H713 (black band).
  • Your label says "pin 2 &3, 139.5 both ways"
  • Your blue arrow shows Pin 1 to J713 which are connected by the board trace, so it should read 0 Ohms.
  • Similar to the other side where Pin 3 is connected to the other side of H713 and reads 0 Ohms.
  • But what you should be measuring is this:
    • Black lead on Pin 1, Red lead on Pin 3. Read Ohms.
    • Black lead on Pin 3, Red lead on Pin 1. Read Ohms.
View attachment 3858468View attachment 3858483
Click to expand...
Yes sorry it was late and I was very tired I've been trying to get this finished when I put all the new components the 100k set to 50% perfect and just to be safe I set the 500 ohm to the max resistance 497ohm 496 0hm & out of the board the 500 ohm trimmers read normal but when soldered to the board they both read 130.5 about this is what got me confused the only thing i have changed was the 1N60 with 1N60P the rest of the board as new components thank you for trying to help I'm going to test again and try to make sense Lol
 
Thanks, because your measurements are the same, I think diode H713 is bad because a diode should test open for reverse biased (meaning not in the circuit) and almost a short for forward biased (meaning it should connect pins 1 & 3 of the VR). You can try and unsolder one side of H713and test it.

1792335044588.png
 
dankik said:
Thanks, because your measurements are the same, I think diode H713 is bad because a diode should test open for reverse biased (meaning not in the circuit) and almost a short for forward biased (meaning it should connect pins 1 & 3 of the VR). You can try and unsolder one side of H713and test it.

View attachment 3859095
Click to expand...
Hi in circuit when Measuring the S3016R diodes they are both reading 0.116 in diode mode in both ways I don't know if the 1N4148 will be any good as a replacement thanks David
 
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Hi Dan hopefully the last question on the Marantz 1030 I'm planning on powering up tomorrow this is my question I've set the 100k trimmers to 50% & the 500ohm I've set to 487ohm the 100k I think is right but the 500ohm I'm just presuming setting them to the highest resistance is the safest bet please feel welcome to shout at me I've been busy this week collecting a Revox b225 and Revox b760 lol thanks in advance David
 
speedycoolda said:
I'm just presuming setting them to the highest resistance is the safest bet
Click to expand...
From the SM:
  • For R729/R730 you might want to set it to the mid-point of the resistance.
  • For R723/R724 you probably also want to set it to the mid-point of the resistance.
1792984947190.png
 
Hi here we go I've powered up my Marantz 1030 I've set the 500ohm to right and left to 8mv then i put a dummy load onto left and right speaker I've put a 1k sign signal into the aux left right channel and put channel 1 of the oscilloscope to + and - of the left speaker output but I cant seem to get a signal am I doing it all wrong please any help would be appreciated thanks in advance David
 
Don't connect your oscilloscope ground lead to anything else but the chassis ground or you could damage some parts. This is because the oscilloscope ground lead is tied directly to the ground pin of the AC plug. If you connect the ground clip to a voltage or signal on the amplifier you will short something out. That's one of the differences between using a DMM (not connected to AC ground) and an oscilloscope (connected to AC ground).

Check to make sure:
  1. You have the speaker switch (MAIN or REMOTE) pushed in.
  2. Tape Monitor switch is not pressed in.
  3. Selector knob is to AUX.
  4. Balance is set to mid-point.
  5. Volume control is set at mid-point.
speedycoolda said:
I've set the 500ohm to right and left to 8mv
Click to expand...
I'm not sure what you mean by this statement? The 500 Ohm is the VR, but what is the 8mV that you refer to and where did you measure it?
EDIT: Now I get it, you are adjusting R729/R730 for the 7.5mVDC for the power amp adjustment... got it.
What is the amplitude of the sine input voltage that your are connecting to the AUX input. It should be about 500mV.
 
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dankik said:
Don't connect your oscilloscope ground lead to anything else but the chassis ground or you could damage some parts. This is because the oscilloscope ground lead is tied directly to the ground pin of the AC plug. If you connect the ground clip to a voltage or signal on the amplifier you will short something out. That's one of the differences between using a DMM (not connected to AC ground) and an oscilloscope (connected to AC ground).

Check to make sure:
  1. You have the speaker switch (MAIN or REMOTE) pushed in.
  2. Tape Monitor switch is not pressed in.
  3. Selector knob is to AUX.
  4. Balance is set to mid-point.
  5. Volume control is set at mid-point.

I'm not sure what you mean by this statement? The 500 Ohm is the VR, but what is the 8mV that you refer to and where did you measure it?
EDIT: Now I get it, you are adjusting R729/R730 for the 7.5mVDC for the power amp adjustment... got it.
What is the amplitude of the sine input voltage that your are connecting to the AUX input. It should be about 500mV.
Click to expand...
Hi the P700 board R747 R748 it says to put multimeter to each side of each resistors & set to 7.5mv using R729 & R730 but i could only get to 7mV or 8mV so I settled for 8mV
also before testing the speaker outputs I've got speakers set to main tape monitor isn't pressed in balance set to mid-point volume at mid-point I thought I needed to connect a dummy load to both speakers I used my oscilloscope for the 1KHz but I did connect channel one of the scope to the left speaker channel but I didn't use the chassis as a ground sorry my mistake thanks David
 
Hi I'm back I've tested it all but I've hit a problem on this Marantz 1030 so here goes I've adjusted the 500ohm to 7.5mV now the 100k trimmers the left went straight to 25v but the right channel would only go to 24.26v so I thought ok just adjust the other side to match it should be ok but the after checking the speaker voltage I tried the amp with aux set main in volume low cd player connected turned the amp on left works perfect but nothing from the right I guess I've done something wrong any thoughts please lol thanks David
 
speedycoolda said:
I've adjusted the 500ohm to 7.5mV now the 100k trimmers the left went straight to 25v but the right channel would only go to 24.26v
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OK, let's make sure you are measuring and setting the voltages correctly.
  1. DC Offset (500 Ohm VR) - are you connecting your DMM to measure DCV across R747 (R748), 0.5 Ohm and adjusting R729 (R730) to get 7.5mVDC across R747 (R748)?
  2. Clipping (100k Ohm VR) - next are you connecting your oscilloscope across the speaker terminals with a 1kHz sine signal into the AUX input jacks and increasing the audio signal (using the Volume control) until you see clipping on the scope? Then, adjust R723 (R724) to make the clipping symmetrical.
If you are measuring 25VDC at the speaker terminals, then you should be OK.
Use your scope to check to make sure that you have a sine wave going into the P700 board on both inputs, J701 and J702.
 
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dankik said:
OK, let's make sure you are measuring and setting the voltages correctly.
  1. DC Offset (500 Ohm VR) - are you connecting your DMM to measure DCV across R747 (R748), 0.5 Ohm and adjusting R729 (R730) to get 7.5mVDC across R747 (R748)?
  2. Clipping (100k Ohm VR) - next are you connecting your oscilloscope across the speaker terminals with a 1kHz sine signal into the AUX input jacks and increasing the audio signal (using the Volume control) until you see clipping on the scope? Then, adjust R723 (R724) to make the clipping symmetrical.
If you are measuring 25VDC at the speaker terminals, then you should be OK.
Use your scope to check to make sure that you have a sine wave going into the P700 board on both inputs, J701 and J702.
Click to expand...
Thanks I will have a look be back soon lol
 
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