Re: {Collins} 312B4 Forward/Reverse Switch



Speaking of the phone patch .... I've disconnected the phone line and
added a two tone generator. Now tune-ups are gentle.
Don W4DNR

Quoting Rush Williams via Collins <collins@xxxxxxxxxxxxx>:

Very informative, Thanks.Rush WB6LXG
 RJ WilliamsFideli Certa MercesFor the faithful there is just reward

    On Monday, October 30, 2017 11:23 AM, calfuhrman7--- via Collins
<collins@xxxxxxxxxxxxx> wrote:


 Bob.

This process can be done in less than 5 minutes and you can usually
do it without removing the 312B-4 from its normal operating position. 

Do NOT remove the trim ring.  But DO remove the four black machine
screws in each corner of the front grill.  Don’t worry about the
nuts dropping behind the panel as they are permanently attached to
the backside of the panel.  The grill can then be pulled forward to expose the backside enough to get some De-Oxit onto the switch
contacts.  The cable that connects the front grill components with
the circuitry in the back is long enough to allow some forward
movement of the grill.  While you are in there, clean the Function
and Phone Patch switches as well.  If the lamp is burnt out, now
would be a good time to replace it as you can reach it with the
grill loose.  Caution:  don’t pull the grille to the point that you
break either of the two wires going between the meter and the 6.3
VAC jack inside the unit.  Those two wires only have about 2 to 3”
of slack. 

Have fun, good luck.

Cal – WA3CTZ

From: Bob via Collins
Sent: Monday, October 30, 2017 1:22 PM
To: COLLINS@xxxxxxxxxxxxx
Subject: {Collins} 312B4 Forward/Reverse Switch

Hi,

What is the best approach to get to the contacts on the front panel
Forward/Reverse switch for cleaning?

Thanks,

Bob, W1XT Sun City West, AZ.
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