I am a neophyte when it comes to electronics, but I have decided to
replace a small burned-out incandescent bulb inside the display panel
of my old Marantz 25-watt receiver (circa 1980). Easy job. Shouldn't
take more than 5 minutes. Remove the front panel from the rest of the
case by removing 4 nuts from the front panel. Then pull off the
control knobs. The problem is that the control knobs won't budge! I
checked carefully, and there are *no* set screws, so that isn't the
problem. The knobs are just your run-of the mill metal knobs. The
only way to remove the front panel is to first remove the knobs, so
that is why I believe the knobs are "removable".

I don't want to damage anything inside the enclosure that the knobs
are attached to. And frankly, I can live with a half-dark display
panel.

Before I decide to leave well enough alone, I thought I'd ask if there
are any tricks involved in safely removing tightly-attached knobs. Or
should I just become more "assertive" in my pulling?

TIA

pb
--

(Phillip Bigelow) writes:

I am a neophyte when it comes to electronics, but I have decided to
replace a small burned-out incandescent bulb inside the display panel
of my old Marantz 25-watt receiver (circa 1980). Easy job. Shouldn't
take more than 5 minutes. Remove the front panel from the rest of the
case by removing 4 nuts from the front panel. Then pull off the
control knobs. The problem is that the control knobs won't budge! I
checked carefully, and there are *no* set screws, so that isn't the
problem. The knobs are just your run-of the mill metal knobs. The
only way to remove the front panel is to first remove the knobs, so
that is why I believe the knobs are "removable".

I don't want to damage anything inside the enclosure that the knobs
are attached to. And frankly, I can live with a half-dark display
panel.

Before I decide to leave well enough alone, I thought I'd ask if there
are any tricks involved in safely removing tightly-attached knobs. Or
should I just become more "assertive" in my pulling?

If there are no set screws, they should just pull off but may be quite
tight after 23 years. I assume one is on the tuning knob. Since that
is a just a bushing, you probably can't hurt anything with resaonable
force. Try that one first.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.

(Phillip Bigelow) writes:

I am a neophyte when it comes to electronics, but I have decided to
replace a small burned-out incandescent bulb inside the display panel
of my old Marantz 25-watt receiver (circa 1980). Easy job. Shouldn't
take more than 5 minutes. Remove the front panel from the rest of the
case by removing 4 nuts from the front panel. Then pull off the
control knobs. The problem is that the control knobs won't budge! I
checked carefully, and there are *no* set screws, so that isn't the
problem. The knobs are just your run-of the mill metal knobs. The
only way to remove the front panel is to first remove the knobs, so
that is why I believe the knobs are "removable".

I don't want to damage anything inside the enclosure that the knobs
are attached to. And frankly, I can live with a half-dark display
panel.

Before I decide to leave well enough alone, I thought I'd ask if there
are any tricks involved in safely removing tightly-attached knobs. Or
should I just become more "assertive" in my pulling?

If there are no set screws, they should just pull off but may be quite
tight after 23 years. I assume one is on the tuning knob. Since that
is a just a bushing, you probably can't hurt anything with resaonable
force. Try that one first.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.

I am a neophyte when it comes to electronics, but I have decided to
replace a small burned-out incandescent bulb inside the display panel
of my old Marantz 25-watt receiver (circa 1980). Easy job. Shouldn't
take more than 5 minutes. Remove the front panel from the rest of the
case by removing 4 nuts from the front panel. Then pull off the
control knobs. The problem is that the control knobs won't budge! I
checked carefully, and there are *no* set screws, so that isn't the
problem. The knobs are just your run-of the mill metal knobs. The
only way to remove the front panel is to first remove the knobs, so
that is why I believe the knobs are "removable".

I don't want to damage anything inside the enclosure that the knobs
are attached to. And frankly, I can live with a half-dark display
panel.

Before I decide to leave well enough alone, I thought I'd ask if there
are any tricks involved in safely removing tightly-attached knobs. Or
should I just become more "assertive" in my pulling?

TIA

Hi,

Are the knobs totally plain? If they have caps then lever
those off and you will find a nut under the cap.

Regards
Jeff

If not succesful with the previous post...once you have tken out the four
screws holding the front panel, use a mallet or wooden hammer and try hitting
the panel as close to the knobs as possible...they should pop-up with a few
strokes.
Alphie

"Angulos" wrote in message
...
If not succesful with the previous post...once you have tken out the four
screws holding the front panel, use a mallet or wooden hammer and try
hitting
the panel as close to the knobs as possible...they should pop-up with a
few
strokes.
Alphie
Can you also get a squirt of CRC onto the hubs of the knobs ? that can help
sometimes, don't let it run into the pots etc.

--
Regards ............... Rheilly Phoull

(Angulos) wrote:

If not succesful with the previous post...once you have tken out the four
screws holding the front panel, use a mallet or wooden hammer and try hitting
the panel as close to the knobs as possible...they should pop-up with a few
strokes.
Alphie

I usually pop the knobs out using a dentist tweezers as a small
crowbar. Actually, I use an old pair of dentist tweezers with the tips
broken, for better leverage.
Ing. Remberto Gomez-Meda
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.

El Meda writes:

(Angulos) wrote:

If not succesful with the previous post...once you have tken out the four
screws holding the front panel, use a mallet or wooden hammer and try hitting
the panel as close to the knobs as possible...they should pop-up with a few
strokes.

Yes, there is some justification for the existence of dentists.

They have the greatest precision tools and the strongest adhesives!

My apologies to those in the field....

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.

Some knobs used a special spring loaded locking device as part of the bushing.
You must reach behind it with a small screw driver and push the lock outward
(towards the front of the knob) and pull at the same time.


(Phillip Bigelow) wrote in message . com...
I am a neophyte when it comes to electronics, but I have decided to
replace a small burned-out incandescent bulb inside the display panel
of my old Marantz 25-watt receiver (circa 1980). Easy job. Shouldn't
take more than 5 minutes. Remove the front panel from the rest of the
case by removing 4 nuts from the front panel. Then pull off the
control knobs. The problem is that the control knobs won't budge! I
checked carefully, and there are *no* set screws, so that isn't the
problem. The knobs are just your run-of the mill metal knobs. The
only way to remove the front panel is to first remove the knobs, so
that is why I believe the knobs are "removable".

I don't want to damage anything inside the enclosure that the knobs
are attached to. And frankly, I can live with a half-dark display
panel.

Before I decide to leave well enough alone, I thought I'd ask if there
are any tricks involved in safely removing tightly-attached knobs. Or
should I just become more "assertive" in my pulling?

TIA

pb
--