Page 1
Service Document
Exchange Set
Concert Boy 240
Service
Manual
Sicherheit
Safety
Materialnr./Part No.
72010 800 0000
Dieses Service Dokument ist nur in Datenform verfügbar
This Service Document is only available as data
Änderungen vorbehalten/Subject to alteration
Made by GRUNDIG in Germany • E-BS-SA18 1101
http://www.grundig.com
Es gelten die Vorschriften und Sicherheitshinweise
gemäß dem Service Manual "Sicherheit", Material-
S
nummer 72010 800 0000, sowie zusätzlich die
eventuell abweichenden, landesspezifischen Vorschriften!
The regulations and safety instructions shall be
valid as provided by the "Safety" Service Manual,
S
part number 72010 800 0000, as well as the
respective national deviations.
ǵ
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72011-049.37
SWITCHES
SW201 = ON / OFF
SW202 A-D = LW
SW203 A-D = MW
SW204 A-D = SW1
SW205 A-D = SW2
SW206 A-D = FM
SW207
A-D = FM PRESET
IC101
LM820
(KA2201)
ǵ
Concert Boy 240
Page 3
(COPPER SIDE)
LW
ON / Off
FM
Preset
FMSW2SW1MW
FM
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
ǵ
Concert Boy 240
Page 4
ǵ
Concert Boy 240
Page 5
ALIGNMENT PROCEDURE
Instruments Required
1. Signal Generator
2. FM Signal Generator
3. AM/FM IF Sweep Generator (10.7MHz for FM)
4. VTVM
5. Oscilloscope
6. Regulated DC power supply
General Preparation
1. Check source voltage, DC or AC according to specifications
2. Set function switch to band being aligned
3. Signal input should be kept as low as possible to avoid AGC and AFC function
4. Standard modulation: AM 1kHz 30% mod., FM 1kHz 22.5kHz dev.
ALIGNMENT
AM IF
MW RF
LW RF
SW 1 RF
SW 2 RF
FM IF
FM RF
D201
TP201 TP202 (GND)
INPUT SIGNAL SOURCE
IF
Oscillator
Aerial band
pass
Oscillator
Aerial band
pass
Oscillator
Aerial band
pass
Oscillator
Aerial band
pass
IF
Oscillator
Aerial band
pass
L202
L206L205
TC204
VCT1D
TC207
TC201
Q202
E
A
Sweep/Signal Generator
via a standard
radiation loop ant. to
via a standard
radiation loop ant. to
A
via a standard
radiation loop ant. to
A
via 10pF
to Testpoint TP201
GND to TP202
via 10pF
to Testpoint TP201
GND to TP202
to Testpoint TP203
GND to TP202
to Testpoint TP201
GND to TP202
L209
L210
VCT1C
L204
C
B
A
526.5kHz
1606.5kHz
148.5kHz
283.5kHz
18.5MHz
16.0MHz
10.7MHz
87.35MHz
108.25MHz
LW
L211
R213
TP203
SIGNAL
(mod.)
460kHz
558kHz
1440kHz
153kHz
261kHz
5.8MHz
6.4MHz
5.9MHz
6.3MHz
6.8MHz
7.0MHz
88MHz
106MHz
VR201
T201
Oscilloscope
GND TP206
GND TP206
TC205
T205
TP204
OUTPUT
to TP205
Speaker
Speaker
Speaker
Speaker
to TP 204
Speaker
TC203
SW2SW1MW FM
L208
TC202
T202
SET RADIO
DIAL TO
Quit point
Lowest end
Highest end
558kHz
1440kHz
Lowest end
Highest end
153kHz
261kHz
Lowest end
Highest end
5.9MHz
6.3MHz
Lowest end
Highest end
7.0MHz
16.0MHz
Quit point
Lowest end
Highest end
88MHz
106MHz
TC
206
L212
R217
L207
ADJUST
T205
L210
VCT1D
L206
VCT1C
L209
TC204
L205
TC201
L211
TC205
L207
TC202
L212
TC206
L208
TC203
T201
T202
VR201
L204
L202
TC207
FM PRES.
TP205
ADJUST FOR
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
TP206
(GND)
Max. &
Symm.
SO201
REMARK
Repeat this
adjustment
Repeat this
adjustment
Repeat this
adjustment
Repeat this
adjustment
Repeat this
adjustment
Repeat this
adjustment
ǵ
Concert Boy 240
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