< TUNER SECTION >9. SW Tracking Adjustment <HR>
Settings : Y Test point : TP8(Lch), TP9(Rch)
1. Clock frequency CheckY Adjustment location :
Settings : Y Test point : TP2 (CLK)L941 ..............................................5.9MHz
Method : <HR>TC943 .........................................17.9MHz
Set to MW 1602kHz and check that the test point isMethod : Set up TC943 to center before adjustment. The output
2052kHz ? 45Hz.level at 5.9MHz is adjusted to maximum by L941. Then
<HA>the output level at 17.9 MHz is adjusted to maximum by
Set to AM 1710kHz and check that the test point isTC943.
2160kHz ? 45Hz.
10. FM Tracking Check
2. AM VT Check <HA>Settings : Y Test point : TP8(Lch), TP9(Rch)
Settings : Y Test point : TP1 (VT)Method : Set to FM 98.0MHz and check that the test point is less
Method : Set to AM 1710kHz, 530kHz and check that the testthan 9dB?V.
point is less than 8.5V (1710kHz) and more than
0.6V (530kHz).11. DC Balance / Mono Distortion Adjustment
Settings : Y Test point : TP3, TP4 (DC Balance)
3. MW VT Adjustment <HR> TP8(Lch), TP9(Rch) (Distortion)
Settings : Y Test point : TP1 (VT)Y Adjustment location : L801
Y Adjustment location : L953Y Input level : 60dB?V
Method : Set to MW 1602kHz and adjust L953 so that the testMethod : Set to FM 98.0MHz and adjust L801 so that the voltage
point becomes 8.0V ? 0.05V. Then check that the testbetween TP3 and TP4 becomes 0V ? 300mV, with
point is more than 0.3V (531kHz).minimum distortion.
4. SW VT Adjustment <HR>
Settings : Y Test point : TP1 (VT)
Y Adjustment location : L942
Method : Set to SW 17.9MHz and adjust L942 so that the test
point becomes 8.0V ? 0.05V. Then check that the test
point is more than 0.3V (5.9MHz).
5. FM VT Check
Settings : Y 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).
6. AM IF Adjustment
Settings : Y Test point : TP8(Lch), TP9(Rch)
Y Adjustment location :
L802 ................................................450kHz
7. AM Tracking Adjustment <HA>
Settings : Y Test point : TP8(Lch), TP9(Rch)
Y Adjustment location :
L951(1/3) ......................................1000kHz
Method : Set to AM 1000kHz and adjust L951(1/3) to MAX.
8. MW Tracking Adjustment <HR>
Settings : Y Test point : TP8(Lch), TP9(Rch)
Y Adjustment location :
L952 ...............................................603kHz
TC941 ..........................................1404kHz
Method : Set up TC941 to center before adjustment. The output
level at 603kHz is adjusted to maximum by L952. Then
the output level at 1404kHz iadjusted to maximum bys
TC941.
� 20 � |
ACEC
