Find the two speaker pins on the audio output module and with the module
removed, check for continuity across the speaker leads. If you check from the
output module end, you will hear the ohm meter put enough current through the
speaker to hear a scratch in the speaker each time you connect the leads. An
older analog meter will work a lot better for this test, as the R X 1 scale
puts considerable current out through the leads.
Checking this way will not only test the speaker but will also test the harness
and any switching in the circuit. I had a problem with a GE speaker that I
finally tracked to a blown fuse inside the speaker module that was not even on
the schematic.
73 - Jim W5ZIT
--- On Mon, 12/29/08, Terry <wx3m.te...@gmail.com> wrote:
From: Terry <wx3m.te...@gmail.com>
Subject: [Repeater-Builder] VHF Unified Chassis Micor
To: Repeater-Builder@yahoogroups.com
Date: Monday, December 29, 2008, 3:22 PM
From retired parts, I am attempting to assemble a VHF Micor Unified
chassis into a repeater. I already succesfully assembled the UHF model.
I can not under any circumstances get any local speaker audio from the
VHF chassis.
The receiver is working and producing discriminator noise, measured at
receiver pins 15 and 16.and on meter position 5.
The audio squelch board works in another station.
The audio pass board is good.(tried 2 other working parts from mobiles)
Jumpers 1, 4, and 5 on the TLN 5644 backplane are in.
J5-14 is jumpered to J5-19
On the backplane board, where the 30 receiver interconnect board pins
come through, pin 6 to 14 in jumpered.
J2 19 is jumpered to 20
What say you?
Thanks,
Terry
_._,___
