-27-
ELECTRICAL ADJUSTMENT-5/13 (K MODEL)
<MW / LW ADJUSTMENT>
For MW / LW adjustment, do wiring and connection as in the following.
5. IF ADJUSTMENT (MW)
Requirement
• Measuring equipment : Oscilloscope or Millivoltmeter
Test point
: TP7 (IC771 24pin), GND
Adjustment point : L772
(1) Adjust the setting of Standard Signal Generator (hereinafter S.S.G.) to 450KHz of 30%
variation.
(2) While looking at the waveform on the oscilloscope, reduce the output level all the way.
(3) Adjust L772 until the waveform of the oscilloscope reaches the maximum.
6. TRACKING ADJUSTMENT (MW)
Requirement
• Measuring equipment : Millivoltmeter
Test point
: TP2, TP3, GND
Adjustment point
: L773
(1) Adjust the S.S.G. setting to 1000KHz of 30% variation and reduce the output level all the way.
(2) Adjust the reception frequency of the main unit to 1000KHz.
(3) Adjust L773 until the value of the millivoltmeter reaches the maximum.
7. TRACKING ADJUSTMENT (LW)
Requirement
• Measuring equipment : Millivoltmeter
Test point
: TP2, TP3, GND
Adjustment point
: TC941, L941
(1) Adjust the S.S.G. setting to 290KHz of 30% variation and reduce the output level all the way.
(2) Adjust the reception frequency of the main unit to 290KHz.
(3) Adjust LTC941 until the value of the millivoltmeter reaches the maximum.
(4) Adjust the S.S.G. setting to 144KHz of 30% variation and reduce the output level all the way
(5) Adjust the reception frequency of the main unit to 144KHz
(6) Adjust LTC941 until the value of the millivoltmeter reaches the maximum.
(7) Repeat the adjustment 2 to 3 times from 1 to 6 above.
60cm
SET
Standerd Signal Generaor
TP
Lch
Rch
GND
measuring equipment
Connect to the respective
GND
OSCILLOSCOPE
CH1
CH2
Lch
Rch
GND
AC MILLIVOLTMETER
CH2
CH1
GND
TP2
TP3
GND
AC MILLIVOLTMETER
CH2
CH1
GND
TP2
TP3
GND
Fig. 2
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