[R-390] RE: R-390 Digest, Vol 45, Issue 15

[Richard Spargur]

Bill, I have seen different colored wires on harnesses.  I have a Collins
version and two Amelco versions.  I have an Amelco version that has all
white wires on the local gain.  If pin 1 is Wht/Blk it should be the wire
that connects through the harness to connector P119 pin 15 (the audio
response switch MUST be in the "Wide" position).  An Ohm meter can check.
The center pin connects to the grid of V602A through connector P119 pin 1.
The third pin and the shield of the center pin cable go to ground.  As a
last resort, it should be relatively easy to ring the harnes out with an ohm
meter at P119 and the local gain control from the bottom without removing
the front panel.  If you need it I will open up my Collins and take a
picture of the local gain control tonight if that helps you. 

Richard 
K3UI

Subject: [R-390] R390A  Local Gain Pot (R105)

Hello Group

Having taken the front panel down numerous times I find the lower Pot(s) (RF
& AF) wires are breaking.  I fixed the RF Gain wiring but the AF Gain wiring
is causing problems.

They are:

The Y2K wiring shows  Pin 1 Wht/Blk  - Wht/Blk
                                       Pin 2  Wht?
                                       Pin 3 (3) Whts-Shields

My question is this...........I have a Red/Wht wire,  not Wht for Pin2.
Both the Y2k Manual, R390A Service show  Wht for Pin 2 (R105) perhaps a
Typo??
Is Pin 1 away from the bottom edge? My Unit is a "55" Collins.

Thanks in advance

Bill KB9IV

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End of R-390 Digest, Vol 45, Issue 15
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