– 22 –
ADJUSTMENT – 1 <TUNER/FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings :
• Test point :
TP2 (CLK)
Method :
Set to AM 1710kHz and check that the test point is
2160kHz
±
45Hz.
2. AM VT Check
Settings :
• Test point :
TP1 (VT)
Method :
Set to AM 1710kHz and check that the test point is less
than 8.5V. Then set to AM 530kHz and check that the
test point is more than 0.6V.
3. AM Tracking Adjustment
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location : L951(1/3)
Method :
Set to AM 1000kHz and adjust L951(1/3) so that the
test point becomes maximum.
4. FM VT Adjustment
Settings :
• Test point :
TP1 (VT)
• Adjustment location : L906
Method :
Set to FM 108.0MHz and adjust L906 so that the test
point becomes 7.0V
±
0.1V. Then set to FM 87.5MHz
and check that the test point is less than 0.4V.
5. FM Tracking Adjustment
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location : L903
Method :
Set to FM 87.5MHz and adjust L903 so that the test
point becomes maximum.
6. AM IF Adjustment
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location :
L802 .................................................... 450kHz
7. DC Balance / Mono Distortion Adjustment
Settings :
• Test point :
TP3, TP4 (DC)
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
with distortion less than 1.2%.
8. Output Level Check
<AM>
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Input level : 74dB
µ
V
Method :
Set to AM 1000kHz and check that the test point is
40mV
±
3dB.
<FM>
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Input level : 60dB
µ
V
Method :
Set to FM 98.0MHz and check that the test point is
200mV
±
3dB.
< FRONT SECTION >
9. MICON OSC Adjustment
Settings :
• Test point :
TP10 (KEY-SCAN)
TP11 (D-GND)
• Adjustment location : L101
Method :
Insert AC plug while pressing of "POWER" key and
"TUNER" function key.
Connect a frequency counter across TP10 and TP11.
Then adjust L101 so that the test point becomes
171.43Hz
±
0.17Hz.
[ Manual Reset ]
Make up for RESET after adjustment.
* Reset is to press "POWER" key while pressing of
"CLEAR (STOP)" key.
All manuals and user guides at all-guides.com
Summary of Contents for Z-L220
Page 12: ...12 SCHEMATIC DIAGRAM 1 MAIN 1 2 All manuals and user guides at all guides com...
Page 13: ...13 SCHEMATIC DIAGRAM 2 MAIN 2 2 TUNER All manuals and user guides at all guides com...
Page 15: ...15 SCHEMATIC DIAGRAM 3 FRONT All manuals and user guides at all guides com...
Page 17: ...17 SCHEMATIC DIAGRAM 4 PT All manuals and user guides at all guides com...
Page 19: ...19 IC BLOCK DIAGRAM All manuals and user guides at all guides com...
Page 25: ...25 MECHANICAL EXPLODED VIEW 1 1 All manuals and user guides at all guides com...
