In , on 11/03/04
at 12:25 PM, (unc80) said:

Needed: Help Diagnosing Weak R Channel on HK Citation 14 Tuner

I have a Harman Kardon Citation Fourteen Tuner... the R channel only
puts out a very weak audio.. can hear music, but only high freq and
very faint.. If anyone can give me some ideas on how and where to try
and diagnose what's causing weak R channel, would greatly appreciate..
L channel is fine and strong.

Also, pulled out the 2 blown lamps behind meters.. part # CM 1813 but
no values... anyone know values of replacement bayonet type bulbs?

Drop "1813 lamp" into your favorite search engine.

There are many techniques available. The "best" technique depends on
your imagination and available test equipment.

In any case, begin with a very detailed visual inspection of all the PC
boards and connections. A few minutes of close visual inspection can
save hours of diagnostic time. In the beginning, suspect all controls,
switches, and plug-in cables. Thump on everything with a wooden dowel
or plastic rod (take care not to bend or dislocate anything).

If you get to the diagnostic mode, you can compare the "perfect" left
channel, point by point, with the deffective right channel. Since I
have full instrumentation and some experience, I would start with a
known input signal and work toward the output, looking for the point
where the signal disappears. If I was in the field with virtually no
instrumentation, I would make a small sniffer probe out of a chopped-up
interconnect cable and a series capacitor then connect the probe to the
auxiliary input to an amplifier.

Using this probe (assuming that you have enough skill not to probe the
AC power supply), start at the output jack and work toward the stereo
decoder, comparing left and right. At some point a signal will appear
in the right channel and give you a hint. (Note that there are some
high frequency signals associated with the stereo decoder, that [partly
depending on your age] may not be audible, but they can damage
amplifiers and/or speakers)

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