GRUNDIG Service
FREAXX 40 RRCD 4204 PLL
2 - 3
Adjustment Procedures
1. Tuner
Test equipment:
Signal Generator, Digital Voltmeter
Adjustment
Preparation
Adjustment Procedure
At
281kHz
adjust
T502
for
7.0V
±
0.2V
.
At
1620kHz
adjust
T501
for
8.5V
±
0.2V
.
Adjust
T509
for
maximum
.
Adjust alternating with
LW COIL
(on the ferrite antenna) at
153kHz
and with
VC503
at
261kHz
for
maximum
.
Adjust alternating with
MW COIL
(on the ferrite antenna)
at
558kHz
and with
VC502
at
1440kHz
for
maximum
.
At
108.0MHz
adjust (bend)
L502
for
7.2V
±
0.2V
.
Adjust alternating with
L501
(bend) at
88.0MHz
and with
VC501
at
106.0MHz
for
AF Maximum
.
1. LW Oscillator
2. MW Oscillator
3. AM IF
4. LW Pre Stage
5. MW Pre Stage
6. FM Oscillator
7. FM Pre Stage
Digital Voltmeter
to
Testpoint TP3
.
Digital Voltmeter
to
Testpoint TP3
.
Couple
Signal Generator
via
Loop Antenna.
f = 450kHz; no modulation
Digital Voltmeter
to
Testpoint TP4
.
Couple
Signal Generator
via
Loop Antenna.
no modulation
Digital Voltmeter
to
Testpoint TP4
.
Couple
Signal Generator
via
Loop Antenna.
no modulation
Digital Voltmeter
to
Testpoint TP4
.
Digital Voltmeter
to
Testpoint TP3
.
Signal Generator
to
Aerial Input (TP1 / TP2 Ground)
;
no modulation
Digital Voltmeter
to
Testpoint TP4
.
