Yacht Boy P 2000
Abgleich / Alignment
GRUNDIG Service
2 - 2
k
Alignment
Measuring instruments: Signal Generator, Sweep Generator, DC-Voltmeter, AF-Voltmeter, Oscilloscope.
Alignment scheme see page 2 - 3.
Alignment
Preparations
Procedure
1. AM IF
2. FM IF
3. MW Oscillator
VCO
4. SW1 Oscillator
VCO
5. SW2 Oscillator
VCO
6. FM Oscillator
VCO
7. MW Aerial
bandpass
8. SW1 Aerial
bandpass
9. SW2 Aerial
bandpass
10. FM Aerial
bandpass
Adjust T2 to maximum.
Adjust T1 to symmetrie and maximum (S-curve).
AM Step-switch 9kHz:
At f
u
(522kHz)
adjust to 1.05
±
0.2V with L6.
At f
o
(1620kHz)
adjust to 7.4
±
0.4V with TC3.
AM Step-switch 10kHz:
At f
u
(520kHz)
adjust to 1.05
±
0.2V with L6.
At f
o
(1710kHz)
adjust to 8.9
±
0.5V with TC3.
Repeat this adjustment.
At f
u
(2.30MHz)
adjust to 1.05
±
0.1V with L7.
At f
o
(7.40MHz)
adjust to 9.8
±
0.2V with TC4.
Repeat this adjustment.
At f
u
(9.40MHz)
adjust to 2.0
±
0.1V with L8.
At f
o
(26.10MHz)
adjust to 9.8
±
0.2V with TC5.
Repeat this adjustment.
At f
u
(87.50MHz)
adjust to 2.0
±
0.3V with L2.
Check at f
o
(108.00MHz)
6.8
±
0.7V.
At 558kHz
adjust to maximum with L6.
Check oscillator alignment (para 3).
At 1440kHz
adjust to maximum with TC2.
Repeat this adjustment.
Adjust L4 to maximum.
Adjust L5 to maximum.
At 88MHz
adjust to maximum with L1.
At 106MHz
adjust to maximum with TC1.
Repeat this adjustment.
AM; tune to a frequency where no broadcast station is
transmitting.
Connect a capacitor of 2.2
µ
F to Pin5 and Pin6 of IC2
(+ to Pin5).
Sweep generator 450kHz to TP3 (IC2 Pin3).
Oszilloscop to TP4 (IC2 Pin19).
FM; tune to a frequency where no broadcast station is
transmitting.
Sweep generator 10.7MHz to TP2 (IC1 Pin4).
Oszilloscop to TP4 (IC2 Pin19).
AM Step-switch 9kHz:
MW f
u
522kHz, f
o
1620kHz
or
AM Step-switch 10kHz:
MW f
u
520kHz, f
o
1622kHz.
DC-voltmeter to TP1 (connector Pin14).
SW1 f
u
2.30MHz, f
o
7.40MHz
DC-voltmeter to TP1 (connector Pin14).
SW2 f
u
9.40MHz, f
o
26.10MHz
DC-voltmeter to TP1 (connector Pin14).
FM f
u
87.50MHz, f
o
108.00MHz
DC-voltmeter to TP1 (connector Pin14).
MW 558kHz, MW 1440kHz
Couple in a standard signal to L3 (ferrite aerial) via a loop
aerial, (f
mod
= 1kHz, m = 30%).
AF-voltmeter to TP6 (speaker output).
SW1 2.40MHz
Couple in a standard signal via 12pF to TP5 (telescopic
aerial) (f
mod
= 1kHz, m = 30%).
AF-voltmeter to TP6 (speaker output).
SW2 9.50MHz
Couple in a standard signal via 12pF to TP5 (telescopic
aerial) (f
mod
= 1kHz, m = 30%).
AF-voltmeter to TP6 (speaker output).
FM 88MHz, FM 106MHz
Couple in a standard signal to TP5 (telescopic aerial)
(f
mod
= 1kHz,
∆
f = 22.5kHz, U
a
as low as possible).
AF-voltmeter to TP6 (speaker output).
