Werbung
WQ-CD220L
TUNER SECTION
¢ AM IF/RF
fL: Low-range frequency
fH: High-range frequency
Test Stage
Specified
Instrument
Value/Adjusting
Connection
° FM IF/RF
Point
T3
Input: Antenna
Output: Pin 19 of IC2
fL: L6
Input: Antenna
fH: TC5
Output:Speaker
170 kHz: L3(LW)
Terminal
270 kHz: TC7
Test Stage
Specified
Instrument
Value/Adjusting
Connection
Point
Input: Pin 1 of IC1
Band Coverage
| fL:L2
Input: Antenna
fH: TC2
Output: Speaker
Tracking
88.0 MHz: L1
Tope
108.0 MHz: TC1
e VCO Frequency
Adjusting Point
Specified
Instrument
Value
Connection
fL: L5
fH: TC4
600 kHz: L3(MW)
1,400 kHz: TC3
fL: L7
fH: TC6
6.5 MHz: L4
16 MHz: TC8
76 kHz + 200 Hz = |Pin 13, Pin 21 and
ground of IC2
Note;
After preparing the test circuit shown in Fig. 24-1, connectthe Pin
13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value.
At this time, apply a standard unmodulated signal input and
adjust the VCO.
} TO FREQUENCY
COUNTER
10 kohm
|
Figure 24-1 VCO FREQUENCY TEST CIRCUIT
ROD ANT.
MAIN PWB-A
TAPE SPEED
VR401
J601
VR500
vA3sso
SW500
Sweé51
Sw202
swi
SW
BEAT TANGetT
PHONES
VOLUME
TONE
X-BASS
POWER/
FMMODE/
BAND
DUBBING
FUNCTION
TAPE1+2(PB)
SPEED
LW_ TRACKING fH
Figure 24-2 ADJUSTMENT POINTS
—~24-
Werbung
