ADJUSTMENT <TUNER / FRONT>
< TUNER SECTION >
1. Clock frequency Check9. LW Tracking Adjustment
Settings : Y Test point : TP2 (CLK)Settings : Y Test point : TP8(Rch), TP9(Lch)
Method : Set to MW 1602kHz and check that the test point isY Adjustment location :
2052kHz ? 45Hz.L941 ................................................144kHz
TC942 .............................................290kHz
2. MW VT CheckMethod : Set up TC942 to center before adjustment. The level at
Settings : Y Test point : TP1 (VT)144kHz is adjusted to maximum by L941. Then the level
Method : Set to MW 1602kHz and check that the test point is lessat 290kHz is adjusted to maximum by TC942.
than 8.0V. Then set to MW 531kHz and check that the
test point is more than 0.6V.10. DC Balance / Mono Distortion Adjustment
Settings : Y Test point : TP3, TP4 (DC Balance)
3. MW Tracking Adjustment : TP8(Rch), TP9(Lch) (Distortion)
Settings : Y Test point : TP8(Rch), TP9(Lch)Y Adjustment location : L801
Y Adjustment location :Y Input level : 60dB?V
L951(1/3) ........................................999kHzMethod : Set to FM 98.0MHz and adjust L801 so that the
Method : Set to MW 999kHz and adjust L951(1/3) so that the testvoltage between TP3 and TP4 becomes 0V ? 0.5V
point is maximum.with distortion less than 1.3%.
4. AM IF Adjustment11. Output Level Check
Settings : Y Test point : TP8(Rch), TP9(Lch)<MW>
Y Adjustment location :Settings : Y Test point : TP8(Rch), TP9(Lch)
L802 ................................................450kHzY Input level : 74dB?V
Method : Set to MW 999kHz and check that test point is
5. FM VT Adjustment55mV ? 3dB.
Settings : Y Test point : TP1(VT)
Y Adjustment location : L907<FM>
Method : Set to FM 108.0MHz and adjust L907 so that the testSettings : Y Test point : TP8(Rch), TP9(Lch)
point becomes 7.0V ? 0.05V. Then set to FM 87.5MHzY Input level : 60dB?V
and check that the test point is more than 0.5V.Method : Set to FM 98.0MHz and check that test point is
270mV ? 3dB.
6. LW VT Adjustment
Settings : Y Test point : TP1(VT)
Y Adjustment location : L942< FRONT SECTION >
Method : Set to LW 144kHz and adjust L942 so that the test
point becomes 1.3V ? 0.05V. Then set to LW 290kHz1. ?-CON OSC Adjustment
and check that the test point is less than 8.0V.Settings : Y Test point : TP1 (O-K-SCAN) and GND
Y Adjustment location : L101
7. FM Tracking AdjustmentMethod : Insert AC plug while pressing TUNER function key.
Settings : Y Test point : TP8(Rch), TP9(Lch)Adjust L101 so that the frequency at the test point is
Y Adjustment location : L901,902,904,90578.52Hz ? 0.08Hz (12.723ms ~ 12.749ms).
Method : Set to FM 98.0MHz and adjust L901,902,904,905 so
that test point is maximum and distortion is minimum.
8. 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 13dB?V.
� 30 � |
ACEC
AIWA
