Sangean DPR-25+, Service Manual

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1. ALIGNMENT FOR AM/LW IF
a. Required Instruments:
AM IF Sweep Generator with scope
b. Alignment Procedure
Mode Adjustment Procedure
(1) Press the power button to turn on the radio.
(2) Connect the input terminal of AM IF sweep generator in series with a resistor of 1.2K
Ω
to the TP1 and TP2.
(3) Connect the RF output terminal of AM IF sweep generator to another test point TP5.
(4) Connect a 100
μ
F electrolytic capacitor to test point TP2 and TP4.
(5) Adjust T1 to have a max. output with a marker frequency of 450 kHz on the sweep
AM T1
scope.
c. Instrument Connection
T1
TP4 TP2
100uF
IN
TP1
RF
TP5
TP2
OUT
450KHz Marker
1.2K Ω
2.2K Ω
AM IF Sweep Generator
ALIGNMENT INSTRUCTIONS
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