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QT-MP3W
CHAPTER 2. ADJUSTMENTS
[1] Tuner Section
Use a plastic screw driver for adjustments.
Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Set of unit
:
Supply voltage
DC 12.0V
:
speaker impedance
4ohms
:
standard output
50 mW
:
Function switch
RADIO
Parts Location:
a. AM Adjustment
Adjusting
Step
Circuit
Closed the output
termial by sweep
1
IF
generator, it place
2
Tuning
Connect AM SG to
coverage
3
Tracking
4
Connect AM SG to
5
b. FM Adjustment
Adjusting
Step
Circuit
2
Tuning
Connect FM SG to
coverage
FM.ANT & D101(-)
3
4
Tracking
Connect FM SG to
FM.ANT & D101(-)
5
L101
T103
Band switch: MW
Connections
Input
Output
Connect sweep
generator to
IC101(17) PIN(A)
to MW ANT
Connect VTVM to
test loop
speaker terminals.
Connect VTVM to
test loop
speaker terminals.
Band switch: FM
Connection
Input
Output
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
C2
C1
L102
SG
Position of
Frequency
Tuning dial
465 KHz
522 KHz
1620 KHz
600 KHz
1400 KHz
1400 KHz
FM Dummy antenna: 75 ohms unbalance
SG
Position of
Frequency
Tuning dial
87.35 MHz
108.25 MHz
90.0 MHz
90.0 MHz
106.0 MHz
106.0 MHz
2 – 1
C4
T101
C3
Adjustment
Low
T103
Low end
T101
High end
C4
600 KHz
MW ANT COIL
C3
Adjustment
Low end
L102
High end
C1
L101
C2
VTVM
Oscilloscope
Max.
Max.
VTVM
Oscilloscope
Max.
Max.
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