ADJUSTMENT <TUNER/FRONT>
< TUNER SECTION > < EZ ONLY >< TUNER SECTION > < U ONLY >
1. Clock Frequency Check1. Clock Check
Settings : Y Test point : TP2 (CLK)Settings : Y Test point : TP2(CLK)
Method : Set to MW 1602kHz and check that the test point isMethod : Set to AM 1710kHz and check that the test point is
2052kHz ? 45Hz.2160kHz ? 45Hz.
2. MW VT Check2. AM VT Check
Settings : Y Test point : TP1 (VT)Settings : Y Test point : TP1(VT),
Method : Set to MW 1602kHz and check that the test point isMethod : Set to AM 1710kHz, AM 530kHz and check
less than 8.0V. Then set to MW 531kHz and check thatthat the test point is less than 8.5V(1710kHz) and
the test point is more than 0.6V.more than 0.6V(530kHz).
3. MW Tracking Adjustment3. AM Tracking Adjustment
Settings : Y Test point : TP5 (Lch), TP6 (Rch)Settings : Y Test point : TP8(Lch), TP9(Rch)
Y Adjustment location : L981 (1/3)Y Adjustment location :
Method : Set to MW 999kHz and adjust L981 (1/3) so that theL981(1/3) ......................................1000kHz
test point becomes maximum.Method : Set to MW 1000kHz and adjust L981(1/3) so that the
test point is max.
4. LW VT Adjustment
Settings : Y Test point : TP1 (VT)4. FM VT Check
Y Adjustment location : L942Settings : Y Test point : TP1(VT)
Method : Set to LW 144kHz and adjust L942 so that the testMethod : Set to FM 108.0MHz and check that the test point is
point becomes 1.3V ? 0.05V.less than 8.0V.
Then set to LW 290kHz and check that the test point isThen set to FM 87.5MHz and check that the test point is
less than 8.0V.more than 0.5V.
5. LW Tracking Adjustment5. FM Tracking Check
Settings : Y Test point : TP5 (Lch), TP6 (Rch)Settings : Y Test point : TP9(Lch), TP9(Rch)
Y Adjustment location :Method : Y Set to FM 98.0MHz and check that the test point is
L941 ........................... 144kHzless than 9.0dB.
TC942 ......................... 290kHz
Method : Set up TC942 to center before adjustment. The level at6. AM IF Adjustment
144kHz is adjusted to MAX by L941. Then the level atSettings : Y Test point : TP8(Lch), TP9(Rch)
290kHz is adjusted to MAX by TC942.Y Adjustment location :
L772 ................................................450kHz
6. AM IF Adjustment
Settings : Y Test point : TP5 (Lch), TP6 (Rch)7. DC Balance / Mono Distortion Adjustment
Y Adjustment location :Settings : Y Test point : TP3, TP4 (DC Balance)
L772 ........................... 450kHz TP8(Lch), TP9(Rch) (Distortion)
Y Adjustment location : L771
7. FM VT CheckY Input level : 60dB?V
Settings : Y Test point : TP1 (VT)Method : Set to FM 98.0MHz and adjust L771 so that the
Method : Set to FM 108.0MHz and check that the testvoltage between TP3 and TP4 becomes 0V ? 0.04V.
point is less than 8.0V. Then set to FM 87.5MHz andNext, check that the distortion is less than 1.3%.
check that the test point is more than 0.5V.
8. FM Tracking Check< FRONT SECTION >
Settings : Y Test point : TP5 (Lch), TP6 (Rch)
Method : Set to FM 98.0MHz and check that the test point is1. ?-CON OSC Adjustment
Settings : Y Test point : TP1 and GND
less than 13dB?V.Y Adjustment location : L801
Method : Insert AC plug while pressing POWER and ECO key.
9. DC Balance / Mono Distortion AdjustmentAdjust L801 so that the frequency at the test point is
Settings : Y Test point : TP3, TP4 (DC balance)
: TP5(Lch), TP6(Rch) (Distortion)78.69Hz ? 0.08Hz.
Y Adjustment location : L771
Y Input level : 60dB?V
Method : Set to FM 98.0MHz and adjust L771 so that the
voltage between TP3 and TP4 is 0V ? 300mV. Next,
check the distortion is less than 1.3 %.
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ACEC
