28
8
3
7
L771
L772
TP1
4
L981
FFE801
TP2
R785
30
IC771
TP4
TP3
TP6
GND
TP5
CN701
12
11 10
TUNER C.B
4
6
L942
L941
TC942
7
ELECTRICAL ADJUSTMENT
< TUNER SECTION >
< FM SECTION >
IHF Sensitiviy:
Less than 13dB
(THD 3%)
(at 108.0/98.0MHz)
Less than 14dB
(at 98.0MHz)
Distortion:
Less than 1.2% (98.0MHz)
Stereo separation:
More than 12dB (98.0MHz)
Intermediate frequency:
10.7MHz
< MW SECTION >
Sensitivity:
Less than 60dB (at 600kHz)
(S/N 20dB)
Less than 58dB
(at 1000/1400kHz)
Distortion:
Less than 1.5%
(at 1000kHz)
< LW SECTION >
Sensitivity:
Less than 70dB (at 144kHz)
Less than 68dB (at 198kHz)
Less than 66dB (at 290kHz)
PRACTICAL SERVICE FIGURE
< TUNER SECTION >
1. Clock Frequency Check
Settings:
•
Test point: TP2 (CLK IC770 pin30)
Method:
Set to MW 1602kHz and check that the test
point becomes 2052kHz±45Hz (EZ).
2. MW VT Check
Settings:
•
Test point: TP1 (VT)
Method:
Set to MW 1602kHz and check that the test
point is less than 8.0V.
Then set to MW 531kHz and check that the
test point is more than 0.6V.
3. MW IF Adjustment
Settings:
•
Test point: TP5, TP6
L772 .............................................. 450kHz
4. MW Tracking Adjustment
Settings:
•
Test point: TP5, TP6
•
Adjustment location: L981
Method:
Set to MW 999kHz and adjust L981 so that the
test point becomes maximum.
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. LW VT Adjustment
Settings:
•
Test point: TP2 (VT)
•
Adjustment location: L942
Method:
Set to LW 144kHz and adjust L942 so that the
test point becomes 1.3V±0.05V.
Then set to LW 290kHz and check that the test
point is less than 8.0V.
7. LW Tracking Adjustment
Settings:
•
Test point: TP5, TP6
•
Adjustment location:
L941 .............................................. 144kHz
TC942 ........................................... 290kHz
Method:
Set up TC942 to center before adjustment.
The level at 144kHz is adjusted to MAX by
L941. Then the level at 290kHz is adjusted to
MAX by TC942.
8. DC Balance/Mono Distortion Adjustment
Settings:
•
Test point: TP3, TP4
•
Adjustment location: L771
•
Input level: 54dB
Method:
Set to FM 98.0MHz and adjust L771 so that
the voltage between TP3 and TP4 becomes
0V±0.04V.
Next, check that the distortion is less than
1.3%.
27
Содержание XR-MD200
Страница 6: ...6 DISASSEMBLY INSTRUCTIONS 1 Remove the two screws 2 Remove the two screws 1 2 ...
Страница 13: ...14 13 BLOCK DIAGRAM IC301 LC866532A ...
Страница 14: ...1 2 3 4 5 6 7 8 9 10 11 12 13 14 A B C D E F G H I J K 16 15 WIRING 1 POWER AMP AC 230V 50Hz ...
Страница 15: ...18 17 SCHEMATIC DIAGRAM 1 POWER AMP Q261 262 MUTE R261 22k R262 22k 220k 220k 1000p 1000p ...
Страница 16: ...1 2 3 4 5 6 7 8 9 10 11 12 13 14 A B C D E F G H I J K 20 19 WIRING 2 FRONT ...
Страница 17: ...22 21 SCHEMATIC DIAGRAM 2 FRONT IC301 LC866532A 5L31 ...
Страница 28: ...40 39 BLOCK DIAGRAM 1 CD ...
Страница 29: ...42 41 BLOCK DIAGRAM 2 MD TO MAIN C B CN502 TO CD C B CN6 ...
Страница 30: ...44 43 WIRING 1 CD 14 13 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H I J CD C B COMPONENT SIDE ...
Страница 31: ...46 45 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A B C D E F G H I J TP3 CD C B CONDUCTOR SIDE ...
Страница 32: ...48 47 SCHEMATIC DIAGRAM 1 CD 1 2 DTC114TK ...
Страница 33: ...50 49 SCHEMATIC DIAGRAM 2 CD 2 2 RESET 5M36 ...
Страница 34: ...1 2 3 4 5 6 7 8 9 10 11 12 13 14 A B C D E F G H I J K 52 51 WIRING 2 FUNCTION ...
Страница 35: ...54 53 SCHEMATIC DIAGRAM 3 FUNCTION ...
Страница 59: ...81 IC BA5936 Rog CURRENT DETECTOR TERMINAL IC BA5970FP IC BA6417F ...
Страница 60: ...82 IC BD7910FV IC AK4519VF ...
Страница 72: ...931196 Printed in Singapore 2 11 IKENOHATA 1 CHOME TAITO KU TOKYO 110 JAPAN TEL 03 3827 3111 ...