Technical Services - Kenwood TS-140S Service Manual

DISPLAY UNIT (X54-3050- XX)
36
Component Use/Function
Operation/Condition/Compatibitity
1C1
Seriai input- type high-voltage
fluorescent indicator jiamp
Converts serial indication data from CONTROL UNIT in paraliel and
turns on fluorescent indicator lamp.
Qi | Fluorescent indicator lamp driver
O01 Switching F.LOCK
| 02 Switching Mev
03 Switching M.IN
04 Switching DOWN
DS Switching VFO/M
D6 Switching SCAN
07 Switching CLEAR
bs Switching UP
09 Switching | USB/LSB
010 Switching Cw (N/W)
O11 Switching FM/AM
[012 Switching 1 MHz
D13 Switching
A/B
-
014 Switching SPLIT
015 Switching A=B
DI6 | Switching RIT
D17
Generation of filament bias voltage
Generates bias for filament of fluorescent
indicator lamp.
018
indication
Turns on red famp in transmission mode.
019 Indication Turns on yetlow lamp when M.SCR is ON
B20 indication Turns on green famp when F.LOCK is ON.
L B21
Indication
Turns on green lamp when 1 MHz
is ON
SIGNAL UNIT (X57-3190-00: TS-680S) (X57-3200-XX:
TS-140S)
_
[ Component Use/Function
Operation/Condition/Compatibitity
1C1 Band data driver 13.8V output.
[ 1C2
Decoding of band data
Open collector. Active is "UL".
IC3 --—--]-RX+ Product detection, TX:
BM 455k Hz
AF
we eee -
a
IC4 Audio power amplifier
Ics TX Ist mixer 455 kHz 40.055MHz,
1C6 FM IF amplifier, detection, squelch
1C7 (1/4) OC switch Turned ON in TX mode.
1C7 (2/4) AF signal switch
Turned ON in SSB and CW made
IC? (3/4)
AF signal switch
Turned ON in FM mode.
FOR SER\ ICE
MANUAL S
1C? (4/4) AF signal switch
Turned ON in AM mode
CONTACT:
1C8 (1/4)
AGC time constant switch
Turned ON in AM mode,
;
1C8 (2/4)
AGC time constant switch
Turned ON in AGC and SLOW mode. MAURIFRON
TECHNICAL SERVICES
I1C8 (3/4) Changeover switch of meter
Turned ON in TX/ALC made
www.
Mauritron.co.uk
1C8 (4/4)
Changeover switch of meter
Turned ON in TX/PWR mode.
TELS OT844 - 351 694
1€9 (1/4) | S-meter sensitivity switch
Turned ON in 50MHz band mode.
FAX: 01844 - 352554
ICQ (2/4) S-meter sensitivity switch
Turned ON in HF mode.
4
ICQ (3/4) Changeover switch of meter Turned ON in RX mode,
t IC9 (4/4) S-meter sensitivity switch
Turned ON in FM mode.
|
1€10 (1/4} ALC ievel switch Turned ON in AM and CW mode.
1C10 {2/4}
ALC level switch
Turned ON in SSB mode.
1C10 (3/4) ALC level switch
Turned ON in power-down mode.
|
1C40 {4/4} ALC level switch
Turned ON in mode other than power-down mode.
IC11 (1/4) ALC amplifier
1C11 (2/4) {Reflected wave voltage amplifier
p ici (3/4) Detected output amplifier Amplifies voltage of traveling wave and reflected wave.
iC11 (4/4) [Power meter amplifier
1C12
8V AVR
|