Kenwood TM-2550A Service Manual page 32
144miiz fm transceiver
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TM-2550A/E,2530A
ADJUSTMENT
ADJUSTMENT
RX ADJUSTMENT
NOTE : COMP = COMPOUND UNIT (X60-1250-10,-51)
REQUIRED
TEST EQUIPMENT
PREPARATION
Measurement
Adjustment
1.
DCV.M
1)
Unless otherwise specified, knobs and switches should
item
Condition
Test
Specification/Remarks
tae
.
equipment | Unit
(Terminal | Unit
Part
Method
1) High input impedance
be set as follows Table 10.
;
:
1. Reset
1) Set the power SW on, while
Display
Tone sounds,
2.
RF VTVM
(RF V.M)
.
ON
SQUELCH
VR
|-MIN
depressing PS key. Then, release
1) Input impedance : 1M&2 min., 2pF max.
POWER SW
the PS key.
2) Voltage range : F.S = 10mV
~ 300V
AL. SW
OFF
AF GAIN
VR
MIN
2) When the lithium battery is
7
3) Frequency range : Up to 150MHz
PRIO SW
OFF
PHONE
SW
OFF
replaced, the microprocessor
=
3.° Frequency Counter (f. counter)
LAMP SW
OFF
TONE SW
OFF
must be reset. Set the power SW
1) Input sensitivity : Approx. 50mV
REV SW
OFF
VOICE SW
OFF
on, while depressing PS key and
2) Frequency range : Up to 150MHz
SCAN SW
OFF
DCL SW
OFF
alien couROL itn
i
;
4.
DC Power Supply
LOW SW
OFF
C. SO. SW
OFF
driver, etc. Then, release
mn
.
:
FF
i
'
1) Voltage : 10V ~ 17V, variable
FLOCK SW
| OFF
CS SW
O
the PS key.
2) Current : 8A min.
Table 10
2. Voltage
1) Power supply : 13.8V DC
DC VM
|COMP. /8R
JP18
7.8V—8.6V
5.
RF Power Meter
check
SQL VR ¢) MIN (fully CCW)
8c
M-1
7.8V-8.6V
1) Measurement range Approx. : 5OW
UP @
® GND
:
6C
(OE
5.6V—6.4V
2) Input impedance : 5022
8M ©)
® vown
8T
@)-4
0.3V or less
3) Frequency range : 144MHz
2) Transmit.
8T
7.8V—8.6V
6.
AF VTVM (AF V.M)
BR
JP18
0.3V or less:
1) Input impedance : 1MQ min.
©
@ss
PLL.
IDB
FV_13.5V
2) Voltage range : F.S= ImV ~ 30V
3.PLL
1) IF level
scope
[PLL
|TP1
PLL
|t14,
|MAx
2.0Vp-p or more.
3) Frequency range : 50Hz ~ 10kHz
GND(MIC}@)
@ MIC
Display : 6.000 (K,M)
(10:1
(R74)
L15
[When PLL leep is
7.
AF Generator (AG)
5.000 (W,T)
probe)
unlocked, ADJ TC4.
1) Output frquency : 100Hz ~ 10kHz
Fig. 20 MIC terminals (view from front panel side)
2) RX VCO (RX)
DC V.M
TP2
TC4 = =6.0V (KM)
20.1V
2) Output voltage : 0.5mV ~ 1V
Display : 2.000 (KM)
(C55)
5.0V (W,T)
8.
Linear Detector
2)
Use an insulated adjusting rod to adjust trimmers and
4.000 (W.T)
Jo29V) KM)
1) Frequency range: 144MHz
coils.
3) Dipay
2.000 (KM)
ina)
m
30V wr)
neue':
9.
Field Strength Meter
3)
To
prevent
damaging
SSG,
never
set the stand
by
: 4.000 {W,7)
(collec-
When PLL loop is un-
1) Frequency range : 144MHz
.
switch
to SEND while adjusting the receiver section.
tor Q5)
tocked,
ADJ TC1,
10. Directional Coupler
4)
Be sure to turn the power switch OFF, before connect-
4) Receive
TP2
11. Oscilloscope
ing the power cable to a power source.
Display : 7.995 (KM)
(C55)
4.0V—6.0V
1) High sensitivity oscilloscope with horizontal
input
5)
SSG
output
levels are those at the time the output
5.995 (W,T)
3.5V—4.5V
termina!
terminal is open.
5
ete
5) Transmit
TP3
4.5V—5.
12. oe
.
~
Display : 7.995 (K,M)
(R17)
Confirm.
1)
requency range:
144~149MHz
5.995 (W,T)
2) Modulation
: AM and FM MOD.
6) HET. Frequency Receive
f.counter
LR
L17
3) Output level : -20dB to 100dB
Display : 6.000 (KM)
(@ -6)
135.305MHz ADJ.
—'[#100Hz
13. Dummy Load
5.000 (W,T)
134.305MHz ADJ.
+100HZ
1) 88, 5W
(approx.)
4. Helical
1) Connect the sweep gen. to
Detctor
|COMP. |TP1
COMP.
|L1,
[Adjust to obtain the
14.
Noise Generator
ANT terminal.
SCOPE
L2,
waveform as right fig.
144
148
(K,M)
1) Must
generate
ignition-like
noise containing
har-.
Output : 10dBy
L4
: g
g
g
Disconnect the No. @
144
146
(T,W)
monics beyond 150MHz.
connector (SF, GND}.
15. Sweep Generator
7OOP
D1
1) Sweep range : 144~149MHz
of
-—O
16. Tracking generator
IN
N
SX
OUT
(TP1)
=TS (Oscilloscope)
D1,D2 1SS99
5.SF level
RF V.M
COMP.
|SF
COMP.
|L6
MAX
0.2V or more
6.GAIN
1) Display : 6.060 (KM)
DC V.M
COMP.
|JP17
COMP.
|L5,
Minimum voltage
Ref, 2.35V
5.060 (TM)
(3.0V
L7,
reading.
ANT : SSG
range)
Lg,
Repeat 2 or 3 times.
Output : 5dBy
L15
MOD. : 7kHz DEV. 3kHz
f: 146.06MHz (K,M)
145.06MHz (W,T)
32
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