In article .com,
"Andrew VK3BFA" wrote:

Fred - its irrelevant here - you are quite correct, but its irrelevant
in this context. The S meter on the ts120 shows different readings on
each band on its OWN cal. oscillator. This is what the oscillator is
designed to do (among other things)

Andrew-

Perhaps I was a little off base. It has been a long time since I had a
TS-120S, and I don't recall the calibration oscillator. I loaned the
service manual to someone several years ago, so I can't check it out!

Since I wasn't aware of the utility of the calibration oscillator, the
only sure evidence of a malfunction was a reference to smoke that seemed
unrelated to receiver sensitivity.

For what it is worth, there is a service bulletin about replacing an input
RF transformer that might have been damaged by static discharge. I don't
know if it applies equally to the TS-120 and TS-120S.

73, Fred, K4DII

SB-040

TS-120S Ant Input Transformer Replacement 7-12-79

Ts-120S transceivers subject to strong static fields or similar high
current atmospheric discharges may suddenly exhibit low RX sensitivity on
all bands. TX will be OK. You may suspect T1 on the RF unit X44-1260-01.

When replacing or ordering T1, L43-0696-35, also check the value of C20.
If it is 33pF, just replace and repeak the transformer.

First production transceivers will have a 15pF cap for C20. When changing
T1, also replace C20 with a 33pF capacitor, and repeak the circuit.

Old part number: L34-0696-05 Antenna Coil
New part number: L34-0696-35
Old Capacitor was 15pF, replace with
New part number: CC45RH1H330J 33pf

Please make these changes in your service manual.

JEB/yn
(c) 71279TKC