Tuner Unit; Adjustment - Sanyo DC-T44 Service Manual

Wmm.mm
mm
-m.-m
mm
mm -*. D-
mmmm --
TUNER UNIT (DC-T44TU)
-Dmm mm -m-Hmm --.-- m-.-m mm.. m .-
JNER ADJUSTMENT
he
a plastic screwdriver for adjustment.
djust the intermediate frequency of AM and FM to the frequency of ceramic filter.
CLOCK
EP ITEMS
OUTPUT CONDITION
PARTS STANDARDS
MEASURE
OUTPUT
CLOCK
Frequency IC242 Pin 33(H)
Counter Earth(E)
CT241
1.048576MHz (200C)
Short the IC242 pin 40 and D2048 anode at power off.
Temperature drift
Output the clock signal for adjustment. 10"C : about + 1.5 Hz, 30"C : about -2.5 Hz, 40"C : about -5 Hz,
Clock signal for adjustment delete at power on.
'M
BAND
SG RF Level : 75 ohm Open voltage
Antenna :75 ohm Direct, Modulation : lkHz, Dev. : f75kHz (mono/stereo). *67.5kHz (main) - *6.75 kHz(Dilot)
EP ITEMS
TUNING INPUT CONDITION OUTPUT CONDITION
PARTS
FREQUENCY
STANDARDS
MEASURE INPUT MEASURE OUTPUT
COVER 108.OMHZ Digital Voltmeter
TP241(H)
---.-- ..--—
TP232(E)
-.... -
Confirm = 8.OV
I
IF(OV)
98.OMHZ ANT
FM SG Digital Voltmeter
TP221(H)
(66d8) TERMINAL *TP222(E) '2202
o ?
0.05V
1 Vco
98.OMHZ ANT
FM SG
Frequency TP231(H)
(66dB)
SVR23
##19 KHz * 50Hz
TERMINAL Counter TP232(E)
98.OMHZ
ANT VTVM
TP233(L)
1 SEPARATION
FM SG
L-R. R-L : Minimum
(66d8)
TERMINAL
Oscilloscope
TP234(R) SVR24
TP235(E)
DEV(MAIN) = * 40k Hz
SD 98.OMHZ
ANT TP223(H)
i
(Auto Stop) (26d8)
FM SG
TERMINAL
Digital Voltmeter
TP232(E)
SVR21 1-3V
x ' TP222 is no earth point. 'x : Adjust in the modulation off after the stereo indicator light on.
MW BAND
Antenna : IRE LOOD. Modulation : 400Hz 30%
"EP ITEMS
TUNING INPUT CONDITION OUTPUT CONDITION
PARTS
FREQUENCY
STANDARDS
MEASURE INPUT
MEASURE
OUTPUT
1 COVER
522kHz TP241(H) L2153
Digital Voltmeter
1.2 f 0.05V
1611k Hz
.-... - -.----
TP232(E)
------
Confirm S 8.OV (about 7.6V)
603kHz LOOP
VTVM
TP233(L)
2
output : Maximum
TRACKING AM SG
L2151
1404kHz
ANT Oscilloscope
TP234(R)
Adjust to near
TP235(E)
CT251
the effective sensitivity.
3
999kHz
LOOP
TP223(H)
(Auti?top) (85d8)
AM SG
ANT
Digital Voltmeter
TP232(E)
SVR22 1-3V
-.
.W BAND
Antenna: IRE LOOD. Modulation : 400Hz
QO~O
rEP ITEMS
TUNING INPUT CONDITION OUTPUT CONDITION
PARTS
FREQUENCY
MEASUf/E
STANDARDS
INPUT MEASURE OUTPUT
1 COVER
144kHz TP241(H) L2154
290kHz
------ -----
Digital Voltmeter
1.6 tO.05V
TP232(E)
-----
Confirm ~ 8.OV (about 7.2V)
162kHz LOOP VTVM
TP233(L)
2 TRACKING AM SG
L2152
Output : Maximum
279kHz
ANT
TP234(R)
Adjust to near
Oscilloscope
TP235(E)
CT252
A
the effective sensitivity.
PARTS LOCATION
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TP223
TP2L1
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FM ANT