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Thanks for your input unfortunately they were unsuccessful.

Customer Question
Do you have anymore troubleshooting...
Thanks for your input unfortunately they were unsuccessful. Do you have anymore troubleshooting ideas for my Roland?
Submitted: 7 months ago.Category: Consumer Electronics
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Answered in 20 minutes by:
12/19/2017
Electronics Technician: Louie, Technician replied 7 months ago
Louie
Louie, Technician
Category: Consumer Electronics
Satisfied Customers: 13,440
Experience: 25+ yrs. experience in the field and 5+ yrs. online, down to component level.
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Hi again and welcome back to JustAnswer. My name is ***** ***** this requested question. I'll be assisting you with your question regarding your "...Roland VR-700 V-Combo..."

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Electronics Technician: Louie, Technician replied 7 months ago

Initially, is the VR-700 completely / electrically dead?
...or simply "...Won't play..." = no sound?
If the latter:

  • what happens when the Roland's R & L/MONO OUTPUT jacks were connected to an amplifier, receiver or powered speaker(s)?
  • how about when plugged in with a pair of headphones?
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Customer reply replied 7 months ago
There is VERY low audio coming from the board. The volume control doesn’t do anything
Electronics Technician: Louie, Technician replied 7 months ago

The described symptom then and the above non-corrective results would indicate an internal hardware issue.

Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?

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Customer reply replied 7 months ago
I do have both.
Electronics Technician: Louie, Technician replied 7 months ago

Great on the DIY!
Please post back with clear pictures of the internal circuitry. Click HERE.
http://ww2.justanswer.com/help/how-do-i-send-photo-or-file-expert-hl
These pictures would then serve as common references allowing me to see what you are seeing.

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Customer reply replied 7 months ago
Ok thanks. I have a meeting at 2. I’ll post the picture right after so we can continue
Electronics Technician: Louie, Technician replied 7 months ago

Yes, please.

I would then post again soon as am back to my regular workstation. Currently on fieldwork with sluggish if at all Internet connection.

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Customer reply replied 7 months ago
Here are the pics
0D8E92A3-B4CC-476F-8BC1...jpeg0D8E92...jpeg8C289BB6-2C7D-49A9-A284...jpeg8C289B...jpegB3CE71C6-A173-45EB-9519...jpegB3CE71...jpeg84922188-1E3F-401D-A56A...jpeg849221...jpegB318AB03-6F67-4B7C-9C60...jpegB318AB...jpeg1E0AECF5-8160-44C9-86A6...jpeg1E0AEC...jpeg
Electronics Technician: Louie, Technician replied 7 months ago

Appreciate the images.

What are the numbers off the 8-pin IC near the PHONES jack?

Incidentally, have you checked/confirmed that the amp & speakers as well as the connecting cables check good?

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Customer reply replied 7 months ago
Where would I find that? And the amp and chords are good.
Customer reply replied 7 months ago
4556AD
JRC
KO33A
Electronics Technician: Louie, Technician replied 7 months ago

Appreciate the additional information.

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Electronics Technician: Louie, Technician replied 7 months ago

With headphones plugged in, check for:

  • +V @ pin 8;
  • -V @ pin 8;
  • touch pin 2 and then pin 3 and determine if there would be a thump humming sound from the headphones;
  • repeat with pins 5 and 6.

A friendly reminder: voltage measurements by its very nature requires that the unit be plugged in and turned on. It is therefore LIVE! Please exercise due care and caution.

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Customer reply replied 7 months ago
Could you show me what exactly I’m touching?
Electronics Technician: Louie, Technician replied 7 months ago

Please click HERE and HERE.

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Customer reply replied 7 months ago
It didn’t make any noise at all
Electronics Technician: Louie, Technician replied 7 months ago

What are the voltages @ pins 4 and 8?

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Customer reply replied 7 months ago
I’m having trouble getting a reading. I may be doing it incorrectly
Customer reply replied 7 months ago
Ok. Everything is registering around 0.5-0.6
Electronics Technician: Louie, Technician replied 7 months ago

Too low.

Please check the output voltage of the power supply board.

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Electronics Technician: Louie, Technician replied 7 months ago

Please set multi-meter to 20DCV (---)

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Customer reply replied 7 months ago
It doesn’t read a stable number. It just jumps around before saying 0
Electronics Technician: Louie, Technician replied 7 months ago

As posted above; ...Too low. Please check the output voltage of the power supply board.

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Customer reply replied 7 months ago
Where is that located
Customer reply replied 7 months ago
Oh ok. I see. Which section of the board do I touch?
Electronics Technician: Louie, Technician replied 7 months ago

Pins 1 ~ 7 of CN2 with respect to common ground.

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Customer reply replied 7 months ago
Are you able to circle in the picture where to touch?
Customer reply replied 7 months ago
Ok that’s what I thought. I’m not getting a reading from any of the pins
Electronics Technician: Louie, Technician replied 7 months ago

Is the VR-700 completely / electrically dead?

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Customer reply replied 7 months ago
No it still powers up
Electronics Technician: Louie, Technician replied 7 months ago

If the VR-700 "...powers up...", then power/voltage is reaching the electronics hence the power supply would most likely be operational. If so, then there would be voltages present from the power supply board.

Please re-check and post back with the voltage read.

Thanks.

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Customer reply replied 7 months ago
I could only get one reading150.6
Electronics Technician: Louie, Technician replied 7 months ago

If the multi-meter is set to (a max of) 20VDC, then it would not be capable of reading/displaying 150.6

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Customer reply replied 7 months ago
I’m sorry I placed the decimal wrong. 15.06
Electronics Technician: Louie, Technician replied 7 months ago

Carefully trace and follow the wires reading this 15.06 until it reaches pin 8 of the JRC4556 IC. Since there was no voltage read previously then there would be a break in the supply line somewhere.

If the wire(s) passes a regulator IC or transistor, then check the input and output of this regulator.

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Customer reply replied 7 months ago
Ok. Right before I do that I tested the voltage once more to be sure. Two read 9.95 two read “15.15” one reads “1” and the red wire reads “0”
Electronics Technician: Louie, Technician replied 7 months ago

I'm sorry but these different readings only make the diagnosistic flow more confusing.

Still and as posted above; ...Carefully trace and follow the wires reading this 15.06 until it reaches pin 8 of the JRC4556 IC. Since there was no voltage read previously then there would be a break in the supply line somewhere. If the wire(s) passes a regulator IC or transistor, then check the input and output of this regulator.

And now it would be trace and follow these "...9.95...15.15...1..."

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Customer reply replied 7 months ago
That wire runs to the cn700 right beside it
Electronics Technician: Louie, Technician replied 7 months ago

...Carefully trace and follow the wires reading this 15.06 until it reaches pin 8 of the JRC4556 IC.

Then follow and trace these wires from/through CN700.

Post back when/where the break is found.

Thanks.

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Customer reply replied 7 months ago
There doesn’t seem to be a break in the wires anywhere
Electronics Technician: Louie, Technician replied 7 months ago

If no break, then there should be voltage at pin 8 of JRC4556 IC.

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Customer reply replied 7 months ago
I have 14.9 on one side and -14.75 on the other
Electronics Technician: Louie, Technician replied 7 months ago

Interesting,; why were the readings before "...jumps around before saying 0 ..."

If now "...14.9 on one side and -14.75 on the other...", please re-touch pins 2 & 3 and 5 & 6 and determine thump/humming sound from headphones.

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Customer reply replied 7 months ago
I can hear a thump now
Electronics Technician: Louie, Technician replied 7 months ago

Interesting indeed!

What could be different now?

"...can hear a thump now..." whereas it was "...didn’t make any noise at all..."

Might it perhaps be a loose connection? ...a wire/connector? ...or even a cold solder?

If so, then such may also be responsible for the "...low audio coming from the board..."

Since "...volume control doesn’t do anything...", re-check the MASTER VOLUME rotary control, the circuit board underneath it and its wires/connectors.

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Customer reply replied 7 months ago
Ok. Visually what should I look for as an indicator?
Electronics Technician: Louie, Technician replied 7 months ago

Please click HERE on how a cold solder would look like compared to a good solder.

Additionally, the video HERE may provide insight.

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Customer reply replied 7 months ago
Ok. Then add fresh solder?
Electronics Technician: Louie, Technician replied 7 months ago

Yes, please. This is re-flow; i.e. re-heating and adding fresh solder.

While at it, it would be a good idea to check any and all other (suspect) solder and carefully re-touch.

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Customer reply replied 7 months ago
Ok. Just to make sure I just add on top of the old solder correct?
Electronics Technician: Louie, Technician replied 7 months ago

Yes; re-heat, melt the old solder and then add a dab of new solder.

Perhaps the video HERE may provide a review.

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