Hi all...
What does the early tr4 radio look like?
Is it the same as the tr6 with flat knobs?
Sent from my Verizon Wireless Phone
----- Reply message -----
From: "John Finlayson" <john_finlayson@telus.net>
Date: Tue, Oct 26, 2010 00:47
Subject: [TR] Triumph Bendix Radio
To: "Randall" <TR3driver@ca.rr.com>, <triumphs@autox.team.net>
Thanks Randall
I found the main capacitor (Bendix 2092983-0708). Unfortunately no polarity
markings, at least none that I can see or understand. It's soldered to the
circuit board. There may be markings on the underside but I can't get at them.
It has "ear com neg" written vertically on the side of the can. Not sure how
that might relate to the terminals on the bottom.
It's mounted a little over an 8th of an inch above the board with some other
small devices and device-board connections in that small space between the
capacitor and the board. That made it a bit interesting to identify the
capacitor terminals.
There are three spade connectors equidistantly spaced just inside the outer
edge of the capacitor base and one longer wire connector more inboard.
With no power to the radio but the power switch "on" and the polarity switch
set "up" all three spade connectors show a direct connection to the power lead
and the wire connector shows a direct connection to the chassis. With the
polarity switch flipped "down" the three spades now show a direct connection to
the chassis and the wire connector shows a direct connection to the power lead.
Any additional help would be appreciated.
Thanks
John
----- Original Message ----- From: "Randall" <TR3driver@ca.rr.com>
To: "'John Finlayson'" <john_finlayson@telus.net>; <triumphs@autox.team.net>
Sent: Sunday, October 24, 2010 6:21 AM
Subject: RE: [TR] Triumph Bendix Radio
>
>
>> Does
>> anyone know which way the switch should be set for positive
>> ground, up or
>> down? There is no indication on the radio which way to set it
>> and I don't want
>> to apply power till I know which way to set it.
>
> One way to find out: Remove the covers and look for the main filter
> capacitor (usually pretty obvious, the largest round can-shaped thing) > which
> should have polarity markings on it. With no power connected to the > radio,
> turn it's switch "on" and use an ohmmeter to determine which terminal of > the
> capacitor is connected directly (0 ohms) to either the chassis or the > power
> input lead. Double-check by flipping the polarity switch and testing > again.
>
> If the "-" terminal is connected directly to the power input lead, or "+"
> directly to ground (the former is more likely); then the radio is > configured
> for positive ground.
>
> Randall
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