– 29 –
< TUNER SECTION >
1. Clock frequency Check
Settings : • Test point : TP2 (CLK)
Method : <HR,HA>
Set to MW 1602kHz and check that the test point is
2052kHz
±
45Hz.
<LH>
Set to MW 1710kHz and check that the test point is
2160kHz
±
45Hz.
2. MW VT Check <LH,HA>
Settings : • Test point : TP1 (VT)
Method : Set to MW 1710kHz, 530kHz and check that the test
point is less than 8.5V (1710kHz) and more than
0.6V (530kHz).
3. MW VT Adjustment <HR>
Settings : • Test point : TP1 (VT)
• Adjustment location : L953
Method : Set to MW 1710kHz and adjust L953 so that the test
point becomes 8.5V
±
0.05V. Then check that the test
point is more than 0.3V (530kHz).
4. SW VT Adjustment <HR>
Settings : • Test point : TP1 (VT)
• 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 : • 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 : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L802 ................................................ 450kHz
Method : The output level at 999/1000kHz is adjusted to
maximum by L802.
7. MW Tracking Adjustment <LH,HA>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L951(1/3) ...................................... 1000kHz
Method : Set to MW 1000kHz and adjust L951(1/3) to MAX.
8. MW Tracking Adjustment <HR>
Settings : • Test point : TP8(Lch), TP9(Rch)
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 is adjusted to maximum by
TC941.
9. SW Tracking Adjustment <HR>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L941 ..............................................5.9MHz
TC943 .........................................17.9MHz
Method : Set up TC943 to center before adjustment. The output
level at 5.9MHz is adjusted to maximum by L941. Then
the output level at 17.9 MHz is adjusted to maximum by
TC943.
10. 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 9dB
µ
V.
11. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
TP8(Lch), TP9(Rch) (Distortion)
• Adjustment location : L801
• Input level : 60dB
µ
V
Method : Set to FM 98.0MHz and adjust L801 so that the voltage
between TP3 and TP4 becomes 0V
±
300mV.
Next, adjust DC Balance coil to achieve minimum
distortion.
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
