Aiwa XR–DV525 Service Manual page 34

ADJUSTMENT – 1 <TUNER / FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point :
Method : Set to MW 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. MW VT Adjustment
Settings : • Test point :
• Adjustment location : L953
Method : Set to MW 1602kHz and adjust L953 so that the
test point becomes 8.5V ± 0.05V. Then set to
MW 531kHz and check that the test point is more
than 0.3V.
3. MW Tracking Adjustment
Settings : • Test point :
• Adjustment location :
L952 .................................................... 603kHz
TC941 ................................................ 1404kHz
Method : Set up TC941 to center before adjustment.
The level at 603kHz is adjusted to MAX. by L952.
Then the level at 1404kHz is adjusted to MAX. by
TC941.
4. SW VT Adjustment
Settings : • Test point :
• Adjustment location : L942
Method : Set to SW 17.9MHz and adjust L942 so that the
test point becomes 8.0V ± 0.05V. Then set to
SW 5.73MHz and check that the test point is more
than 0.3V.
5. SW Tracking Adjustment
Settings : • Test point :
• Adjustment location :
L941 .................................................. 5.73MHz
TC943 ................................................ 17.9MHz
Method : Set up TC943 to center before adjustment.
The level at 5.73MHz is adjusted to MAX. by L941.
Then the level at 17.9MHz is adjusted to MAX. by
TC943.
6. AM IF Adjustment
Settings : • Test point :
• Adjustment location :
L802 .................................................... 450kHz
7. FM VT Check
Settings : • Test point :
Method : Set to FM 87.5MHz check that the test point is more
than 0.5V. Then set to FM 108.0MHz and check that
the test point is less than 8.0V.
8. FM Tracking Check
Settings : • Test point :
Method : Set to FM 98.0MHz and check that the test point is
less than 9dBµV.
TP2 (CLK)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
TP8 (Lch), TP9 (Rch)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
• Adjustment location : L801
• Input level :
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP3 and TP4 becomes 0V ± 300mV
with distortion less than 1.3%.
10. Output Level Check
<MW>
Settings : • Test point :
• Input level :
Method : Set to MW 999kHz and check that the test point is
74mV ± 3dB.
<FM>
Settings : • Test point :
• Input level :
Method : Set to FM 98.0MHz and check that the test point is
320mV ± 3dB.
11. FM Separation Check
Settings : • Test point :
• Input level :
Method : Set to FM 98.0MHz and check that the test point is
more than 25dB.
< FRONT SECTION >
µ
12. -CON Clock Adjustment
Settings : • Test point :
• Adjustment location : L331
Method : Insert AC plug while pressing of "POWER" key and
"TUNER" function key.
Connect a frequency counter across TP10 and TP11.
Then adjust L331 so that the test point becomes
318.80Hz ± 0.32Hz.
[ Manual Reset ]
Make up for RESET after adjustment.
* Reset is to press "POWER" key while pressing of
"CLEAR (STOP)" key.
– 34 –
TP3, TP4 (DC)
60dBµV
TP8 (Lch), TP9 (Rch)
74dBµV
TP8 (Lch), TP9 (Rch)
60dBµV
TP8 (Lch), TP9 (Rch)
60dBµV
TP10 (K-SCAN)
TP11 (GND)