Kenwood TS-990S Service Manual

TS-990S
238
LEVEL DIAGRAM
Q10
Q11
PSEL
AMP
–113dBm
–119dBm
–110dBm
CN11
BPFI
ANT1 CN1
MRAT
14.001MHz
8.248MHz
RX UNIT (X55-313 A/2)
SUB BAND
MAIN BAND
Measurement condition
Frequency: 14.0MHz
PRE AMP: ON
ANT input: –113dBm/0dBµ
AF output: 0.63V/8
Ω、
1kHz
Mode: USB
The values in parentheses ( ) are those in FM mode
Filter Lo: 200 / Hi: 2800
Receiver Section
RF
BPF
CN13
BPFO
–110dBm
–109dBm
BPF UNIT
(X55-313 B/2)
PRESEL UNIT
(X42-343 B/10)
CN26
PREI
CN53
PREO
–109dBm
–109dBm
Q25
Q26
PREAMP
–106dBm
L55
L59
L60
1st Mix
DIPLEXER
L121
L122
–120dBm
AMP
Q46
L77
–110dBm
D26
D27
D28
D29
NBG
L79
–111dBm
IFFIL
XF3
XF4
XF5
XF6
XF8
L108
A
T
–111dBm
–114.5dBm
–78dBm
Q
Q
Q70
IC7 IC8
–113dBm
–116dBm
ANT1 CN200
SRAT
Q351 Q353
Q352 Q354
–104dBm –110dBm –96dBm –92.5dBm
–
–107dBm
–101dBm –95dBm –102.5dBm
–78.5dBm
–73dBm
L356 L359
XF351
Q481
Q492
Q493
D481
D482
D483
D484
ATT
Q401 Q403
Q406 Q409
[–109dBm] [–108dBm] [–112dBm]
[–111dBm] [–111dBm]
[–97dBm] [–101dBm]
L403 L406
L423
L424
D405
D406
XF401
AMP
Q494
Q495
D5
0
XF485
XF486
XF481
XF482
XF484
10.695MHz73.095MHz
RF
BPF
Q219
–117dBm
PREAMP
1st MIX
1st MIX
Q491
AGC
14.001MHz
11.374MHz
TX-RX UNIT (X57-827 A/2)
Measurement condition
Frequency: 14.0MHz
PRE AMP: ON
ANT input: –113dBm/0dBµ
AF output: 0.63V/8
Ω、
1kHz
Mode: USB
The values in parentheses ( ) are
those in FM mode
Filter Lo: 200 / Hi: 2800
ANT: ANT1
SUB: ON
(The signal which passed the MAIN/SUB distributor.)
2nd MIX
AMP
NBG
IFFIL
AMP A
T
ANT: ANT1
SUB: OFF
PSEL: OFF
AGC
Input –113dBm from the antenna, set AF VOLUME so that AF output is 0.63Vrms, and measure the sign
a
The AF section is measured with an oscilloscope and the other parts are measured with a Spectrum Anal
y
The values in parentheses [ ] are those in RX2 (IF1: 73.095MHz)
Filter Lo: 200 / Hi
：
3000
MIC
D707
Q705
IC683
5mVrms 85mVp-p
AF 1kHz
DSP UNIT (X53-453) TX-RX UNIT (X57-827 A/2)
TIF 24kHz 10.695MHz 73.095MH
z
560mVp-p 1.1Vp-p
420mVp-p 180mVp-p
350mVp-p 250mVp-p 150mVp-p 2.8
V
72mVp-p
IC674 IC666
ADC
IC398
IC202
IC397
IC679
IC668
25
11
DSP
IC701
Q702
XF482 Q703
45
L419
L424
L423
D405
D406
Transmitter Section
Measurement condition
Frequency: 14.0MHz
Mode: USB
MIC input: 1kHz/5mV
Output power: 100W
MIC level: ALC zone maximum
Audio frequency section is measured by the AF voltmeter or oscilloscope.
Radio frequency section is measured by high impedance RF voltmeter.
Input –113dBm from the antenna, set AF VOLUME so that AF output is 0.63Vrms, and measure the sign
a
The AF section is measured with an oscilloscope and the other parts are measured with a Spectrum Anal
y
Receiver Section
Transmitter Section

Kenwood TS-990S Specifications

General

Receiver Type	Triple Conversion Superheterodyne
Antenna Tuner	Built-in automatic antenna tuner
DSP	Yes
IF DSP	Yes
Modes	SSB, CW, AM, FM
Display	7-inch TFT color LCD
Weight	25 kg (55.1 lbs)
Antenna Connectors	SO-239
Power Supply	13.8V DC