– 38 –
ADJUSTMENT <TUNER / DECK / CD>
< TUNER SECTION >
1. Clock Frequency Check
Settings :
• Test point :
TP3 (CLK)
Method :
Set to AM 1710kHz (LH,U,HA), AM 1602kHz (HR),
MW 1602kHz (EZ,K,HS,G) and check that the test
point is 2160kHz
±
45Hz (LH,U,HA), 2052kHz
±
45Hz (EZ,K,HS,G,HR),
2. AM (MW) VT Check
Settings :
• Test point :
TP4 (VT)
Method :
Set to AM 1710kHz (LH,U,HA), AM 1602kHz (HR),
MW 1602kHz (EZ,K,HS,G) and check that the test
point is less than 8.5V (LH,U,HA,HR), less than 8.0V
(EZ,K,HS,G). Then set to AM 530kHz (LH,U,HA),
AM 531kHz (HR), MW 531kHz (EZ,K,HS,G) and
check that the test point is more than 0.6V (LH,U,HA,
EZ,K,HS,G), more than 0.3V (HR).
3. AM (MW) Tracking Adjustment
Settings :
• Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
• Adjustment location : L981 (1/3)
Method :
Set to AM 1000kHz (LH,U,HA), AM 999kHz (HR),
MW 999kHz (EZ,K,HS,G) and adjust L981(1/3) so
that the test point becomes maximum.
4. AM IF Adjustment
Settings :
• Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
L772 .................................................... 450kHz
5. LW VT Adjustment <EZ,K,HS,G only>
Settings :
• Test point :
TP4 (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 <EZ,K,HS,G only>
Settings :
• Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
• 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.
7. FM VT Check
Settings :
• Test point :
TP4 (VT)
Method :
Set to FM 108.0MHz (87.5MHz) and check that the
test point is less than 8.0V (108.0MHz) and more than
0.5V (87.5MHz).
8. FM Tracking Check
Settings :
• Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
Method :
Set to FM 98.0MHz and check that the test point is
less than 8dBuV (LH,U,HA,HR), less than 13dBuV
(EZ,K,HS,G).
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
TP5 (DC), TP6 (DC)
• Adjustment location : L771
• Input level :
60dBuV
Method :
Set to FM 98.0MHz and adjust L771 so that the
voltage between TP5 and TP6 becomes 0V
±
0.04V.
Next, check that the distortion is less than 1.0%.
10. FM Separation Check
Settings :
• Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
• Input level :
60dBuV
Method :
Set to FM 98.0MHz and check that the test point is
more than 25dB (LH,U,HA,HR), more than 12dB
(EZ,K,HS,G).
< DECK SECTION >
11. Tape Speed Adjustment
Settings :
• Test tape :
TTA–100
• Test point :
J602 (3/3) LINE OUT
• Adjustment location : SFR1
Method :
Play back the 3kHz signal of the test tape and adjust
SFR1 for 3000Hz
±
5Hz (FWD) and FWD PLAY
speed
±
45Hz (REV).
12. Head Azimuth Adjustment
Settings :
• Test tape :
TTA–300
• Test point :
J602 (3/3) LINE OUT
• Adjustment location : Head azimuth
adjustment screw
Method :
Play back (FWD) the 8kHz signal of the test tape and
adjust screw so that the output becomes maximum.
Next, perform on REV PLAY mode.
13. PB Frequency Response Check
Settings :
• Test tape :
TTA–320
• Test point :
J602 (3/3) LINE OUT
Method :
Play back the 315Hz and 10kHz signals of the test
tape and check that the output ratio of the 10kHz
signal with respect to that of the 315Hz signal is
–3dB
±
3dB.
14. REC/PB Frequency Response Check
Settings :
• Test tape :
TTA–602
• Test point :
J602 (3/3) LINE OUT
Method :
Input a –20VU (0dB) signal to the AUX terminal.
Record the 1kHz and 8kHz signals on the test tape and
play back them. Check that the difference between the
record level and theplay back level at 1kHz and 8kHz
signal is –2dB to
±
3dB.
< CD SECTION >
15. Focus Bias Adjustment
Settings :
• Test disc :
TCD–782
• Test point :
TP1 (RF), TP2 (VREF)
• Adjustment location : SFR130
Method :
Play back the test disc (TCD–782, Track No. 2) and
adjust SFR130 so that the RF level is maximum and
the jitter is minimum
www.freeservicemanuals.info
9/3/2014
Global electronic heritage manuals
