Adjustment Procedures - Grundig RR 300 CD Bedienungsanleitung

RR 300 CD

Adjustment Procedures

1. Tuner
Measuring instruments: Signal generator, sweep generator, oscilloscope.
Function switch: Radio
Adjustment
1. AM IF Couple in a sweep signal of 455kHz to L205 (ferrite aerial)
via a loop aerial.
Oscilloscope to IC201 Pin 18.
Band switch: MW
2. MW Oscillator MW f
u
Couple in a standard signal to L205 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: MW
3. MW Aerial MW 600kHz, MW 1400kHz
bandpass Couple in a standard signal to L205 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: MW
4. FM Oscillator FM f 87.3MHz, f
u
Couple in a standard signal via a 10nF capacitor to aerial
contact (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: FM
5. FM Aerial FM 90MHz, FM 106MHz
bandpass Couple in a standard signal via a 10nF capacitor to aerial
contact (f
so that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: FM
GRUNDIG Service
Preparations
515kHz, f 1650kHz
o
= 1kHz, m = 30%, U as low as possible so
a
mod
= 1kHz, m = 30%, U as low as possible so
a
mod
108,4MHz
o
= 1kHz, ∆f = 22.5kHz, U
as low as possible so
a
mod
= 1kHz, ∆f = 22.5kHz, U
a
mod
T201
IC 202
Pin 18
L203
T202
Adjust to maximum with T201.
At tuning minimum (515kHz) adjust with T202 and at
tuning maximum (1650kHz) adjust with PVC201-C to
maximum output.
Repeat this adjustment alternately.
At 600kHz adjust to maximum with L205 (MW aerial coil,
move).
At 1400kHz adjust to maximum with PVC201-D.
Repeat this adjustment alternately.
At tuning minimum (87,3MHz) adjust with L203 and at
tuning maximum (108,4MHz) adjust with PVC201-A to
maximum output.
Repeat this adjustment alternately.
At 90MHz adjust to maximum with L204 (bend).
At 106MHz adjust to maximum with PVC201-B.
as low as possible Repeat this adjustment alternately.
ANT
L204
B D
PVC201
C
A
Abgleichvorschriften / Adjustment Procedures
Adjustment Process
L205
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