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EQUIPMENT REQUIRED
Signal Source
1. AM signal generator (AM SG)
2. FM signal generator (FM SG)
3. Sweep generator (10.7 Mhz for FM)
Output Indicator
1. SSVM
2. Oscilloscope
3. Frequency Counter
General preparation
1. Check source voltage.
2. Set function switch to band being aligned
3. Turn volume control to minimum (unless noted otherwise)
4. Connect low side of signal and output indicator to chassis ground unless otherwise specified.
Keep ground connection close to high side connection.
5. Keep signal inout as low as possible to avoid AGC and AFC action
(set output indicator to high sensitivity.)
6. Standard modulation is 1000 Hz AT 30% amplitude for AM (1000 Hz at 22.5 kHz deviation for FM)
AM IF ALIGNMENT
Signal source (AM RF Gen) Connect
Step
to
1
A standard radiation loop
2
Repeat for maximum output
AM RF ALIGNMENT
Signal source (AM Signal Gen.)
connect to
1
2
A standard radiation loop antenna
3
4
5
Repeat Steps 3 and 4 as necessary to minimize tracking error. Also repeat steps 1 and 2 if necessary.
FM ALIGNMENT PROCEDURE
Signal source (FM RF Gen.)
Step
Connect to
1
TP1 and GND
2
3
Repeat Step 1 and 2 as necessary to obtain S curve linearity , with maximum output
FM RF ALIGNMENT
Signal source (FM Signal Gen.)
Step
Connect to
1
2
TP 1, GND (Test point) through
matching network if necessary
3
4
5
repeat steps 3 and 4 as necessary to minimum tracking error. Also repeat steps 1 and 2 if necessary.
* UK models must not be able to tune below 87.5 MHz.
BATTERY SENTINEL LEN ADJUSTMENT SETTING OF the 27 pin of IC2 (FOR SWITCH -ON POINT)
1. Plug unit into an AC outlet.
2. Set clock as described in owner's manual
3. Connect a DC power supply to the battery snap (inside battery compartment - no battery connected.)
Connect to DC voltmeter across battery snap.
4. Set DC power suply to 8.2 volts. Adjust 27 pin of IC2 to the point where the Battery Sentinel just turns on. Disconnect DC power supply and voltmeter.
5. Connect to a new battery . (Battery Sentinel Indicator will automatically be reset.)
ALIGNMENT PROCEDURE
MODEL NO. GRUNDIG SONOCLOCK SC 50/50L
Aligment indicator connect to
Set signal to
Oscilloscope or SSVM
460 KHz
TP3 Detector Output Terminal
Set signal to
Alignment indicator Connect to
515 KHz
(modulated)
1745 KHz
(modulated)
Across speaker voice coil
600 KHz
(modulated)
1440 KHz
(modulated)
Alignment Indicator connect to
Set signal to
Oscilloscope or SSVM
Sweep
TP3 Detector Output Terminal
centered 10.7
MHz
Alignment indicator (oscilloscope ,
Set signal to
VTVM Connect to
87 MHz
modulated
109 MHz
modulated
Across speaker voice coil
90 MHz
modulated
106 MHz
modulated
Set radio dial to
Adjust
T5
Quiet point
Set radio dial to
Adjust
515 KHz
T6
(Osc,
(lowest end)
coil)
1745 KHz
C3
(Osc,
(Highest end)
trim)
600 KHz
L2 (ant coil)
1400 KHz
C4 (ant trim)
Set Radio dial
Adjust
to
T7
Quiet point
Symmetrical response centered
Set radio dial to
Adjust
*87MHz (lowest
L7 (Osc, coil)
end)
109MHz
C1
(Osc,
(Highest end)
trimmer)
L8 (RF coil)
90MHz
stretch or
squeeze
106MHz
C2 (RF trim)
Adjust for
Remarks
Volume control min
Maximum
position
Adjust for
Remarks
Volume control max-
Maximum
position
Adjust for
Remarks
Volume control min-
position
10.7Mhz
Adjust for
Remarks
Volume control Max-
Maximum
position
Sonoclock 50 SC 5300
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