– 15 –
ADJUSTMENT – 1 <TUNER/FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point :
TP2 (CLK)
Method :
Set to MW 1602kHz and check that the test point is
2052kHz
±
45Hz.
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. FM VT Check
Settings : • Test point :
TP1 (VT)
Method :
Set to FM 108.0MHz and check that the test point is
less than 8.0V. Then set to FM 87.5MHz and check
that the test point is more than 0.5V.
4. 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 13dB
µ
V.
5. LW VT Adjustment
Settings : • Test point :
TP1 (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.
6. LW Tracking Adjustment
Settings : • Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location :
L941 .................................................... 144kHz
TC942 .................................................. 290kHz
Method :
Set up TC942 to center before adjustment. The level at
144kHz is adjusted to maximum by L941. Then the
level at 290kHz is adjusted to maximum by TC942.
7. MW Tracking Adjustment
Settings : • Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location :
L951 (1/3) ....................................................1000kHz
Method :
Set to MW 999kHz and adjust L951 (1/3) so that the
test point becomes maximum.
8. MW IF Adjustment
Settings : • Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location :
L802 .................................................... 450kHz
9. 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%.
10. Output Level Check
<MW>
Settings : • Test point :
TP8 (Lch), TP9 (Rch)
• Input level : 74dB
µ
V
Method :
Set to MW 999kHz 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
140mV
±
3dB.
11. FM Separation Check
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
more than 12dB.
< FRONT SECTION >
12. 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
171.46Hz
±
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-L120
Page 8: ...8 SCHEMATIC DIAGRAM 1 MAIN 1 2 All manuals and user guides at all guides com...
Page 9: ...9 SCHEMATIC DIAGRAM 2 MAIN 2 2 TUNER All manuals and user guides at all guides com...
Page 13: ...13 SCHEMATIC DIAGRAM 4 PT All manuals and user guides at all guides com...
Page 14: ...14 IC BLOCK DIAGRAM All manuals and user guides at all guides com...
Page 17: ...17 MECHANICAL EXPLODED VIEW 1 1 All manuals and user guides at all guides com...
