ADJUSTMENT <TUNER / FRONT>
< TUNER SECTION >< FRONT SECTION >
1. Clock frequency Check
Settings : Y Test point : TP2 (CLK)1. ?-CON OSC Adjustment
Method : Set to AM 1710kHz and check that the test point isSettings : Y Test point : TP1 (O-K-SCAN) and GND
2160kHz ? 45Hz.Y Adjustment location : L101
Method : Insert AC plug while pressing TUNER function key.
2. AM VT CheckAdjust L101 so that the frequency at the test point is
Settings : Y Test point : TP1 (VT)78.4Hz ? 0.08Hz (12.742ms ~ 12.768ms).
Method : Set to AM 1710kHz, AM 530kHz and check that the test
point is less than 8.5V(1710kHz) and more than
0.6V(530kHz).
3. AM Tracking Adjustment
Settings : Y Test point : TP8 (Rch), TP9 (Lch)
Y Adjustment location :
L951(1/3) ......................................1000kHz
Method : Set to AM 1000kHz and adjust L951(1/3) so that the test
point is maximum.
4. AM IF Adjustment
Settings : Y Test point : TP8 (Rch), TP9 (Lch)
Y Adjustment location :
L802 ................................................450kHz
5. FM VT Adjustment
Settings : Y Test point : TP1 (VT)
Y Adjustment location : L907
Method : Set to FM 108.0MHz and adjust L907 so that the test
point becomes 7.0V ? 0.05V. Then set to FM 87.5MHz
and check that the test point is more than 0.5V.
6. FM Tracking Adjustment
Settings : Y Test point : TP8 (Rch), TP9 (Lch)
Y Adjustment location : L904
Method : Set to FM 98.0MHz and adjust L904 so that test point is
maximum. and distortion is minimum.
7. FM Tracking Check
Settings : Y Test point : TP8 (Rch), TP9 (Lch)
Method : Set to FM 98.0MHz and check that the test point is
less than 9.0dB?V.
8. DC Balance / Mono Distortion Adjustment
Settings : Y Test point : TP3, TP4 (DC Balance)
: TP8 (Rch), TP9 (Lch) (Distortion)
Y Adjustment location : L801
Y Input level : 60dB?V
Method : Set to FM 98.0MHz and adjust L801 so that the
distortion is less than 1.3%. Then check the voltage
between TP3 and TP4 is 0V ? 0.5V.
� 30 � |
ACEC
