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ADJUSTMENT <TUNER> (MX-NDVH2450)
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to MW 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. MW VT Adjustment
Settings : • Test point : TP1 (VT)
• Adjustment location : L981(3/3)
Method : Set to MW 1710kHz and adjust L981(3/3) so that the
test point becomes 7.5V ± 0.05V. Then set to MW
530kHz and check that the test point is more than 0.3V.
3. MW Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L981(1/3) ........................................ 603kHz
TC941 ........................................... 1404kHz
Method : Set up TC941 to center before adjustment.
The level at 603kHz is adjust to max. by L981(1/3).
Then the level at 1404kHz is adjust to max. by TC941.
4. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L772 ................................................ 450kHz
5. SW VT Adjustment
Settings : • Test point : TP1(VT)
• Adjustment location : L942
Method : Set to SW 17.9MHz and adjust L942 so that the test
point becomes 6.5V ± 0.05V. Then set to SW 5.73MHz
and check that the test point is more than 0.3V.
6. SW Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L941 ............................................. 5.73MHz
TC942 .......................................... 17.9MHz
Method : Set up TC942 to center before adjustment.
The level at 5.73MHz is adjust to max. by L941.
Then the level at 17.9MHz is adjust to max. by TC942.
7. FM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to FM 87.5MHz, 108.0MHz and check that the test
point is more than 0.5V (87.5MHz) and less than 8.0V
(108.0MHz).
8. FM Tracking Check
Settings : • Test point : TP8(Lch), TP9(Rch)
Method : Set to FM 98.0MHz and check that the test point is
less than 9dBµV.
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
• Adjustment location : L771
• Input level : 60dBµV
Method :
Set to FM 98.0MHz and adjust L771 so that the
voltage between TP3 and TP4 is 200mV ± 3dB with
minimum distortion.
– 27 –
: TP8(Lch), TP9(Rch) (Distortion)
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