Aiwa CSD-ED79, Руководство по обслуживанию

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ADJUSTMENT <TUNER / CD>
MAIN C.B
A
3
L003 (BAR ANT)
IC001
L005
SFR430
L006
5
4
3
2
TC001
L004
1
CD MAIN C.B
C
IC402
IC401
IC404
IC002
L007
TP2 (VREF)
TP1 (RF)
6
6
PRACTICAL SERVICE FIGURE
<TUNER SECTION>
<FM SECTION>
IHF Sensitivity :
Less than 18dB
(THD 3%) [at 87.5 / 98 / 108MHz]
Signal to noise ratio : Mono : More than 66dB
Stereo : More than 58dB
[at 98MHz ]
Distortion : Less than 3% [at 98MHz ]
Auto stop level : 24dB
±
10dB
[at 87.5 / 98 / 108MHz]
Stereo separation : More than 20dB [at 98MHz]
Intermediate frequency : 10.7MHz
<AM(MW) SECTION>
Sensitivity :
Less than 48dB
S/N (10dB) [at 600kHz]
Less than 46dB
[at 1000kHz]
Less than 44dB
[at 1400kHz]
Signal to noise ratio : More than 30dB
[at 600 / 1000 / 1400kHz]
Distortion : Less than 3%
[at 1000kHz]
Auto stop level : Less than 70dB
[at 600kHz]
Less than 65dB
[at 1000kHz]
Less than 60dB
[at 1400kHz]
Intermediate frequency : 450kHz
<LW SECTION> (EZ)
Sensitivity :
Less than 60dB [at 153kHz]
(S/N 10dB) Less than 58dB at [198kHz]
Less than 56dB [at 288kHz]
Signal to noise ratio : More than 30dB
[at 153 / 198 / 288kHz]
Distortion : Less than 3% [at 198MHz ]
Auto stop level : Less than 80 / 75 / 70dB
[at 153 / 198 / 288kHz]
Intermediate frequency : 450kHz
<DECK SECTION>
Tape speed : 90 / -60Hz (TN-21ZVC-1816)
3000Hz
±
90Hz (TN-51RV-240)
Wow & flutter : Less than 0.4% (R.M.S)
Take-up torque : 30 ~ 60g-cm (FWD) (TN-21ZVC-1816)
20 ~ 60g-cm (FWD) (TN-51RV-240)
F.F & REW torque : 55 ~ 140g-cm (TN-21ZVC-1816)
55 ~ 120g-cm (TN-51RV-240)
Distortion : Less than 3% (PB, 1kHz, DC)
Less than 5% (REC/PB, 1kHz, DC)
S/N ratio : More than 35dB (PB, AC, DC)
More than 25dB (REC/PB, AC, DC)
Max Noise level : Less than 45mV (PB, DC, AC, VOL
MAX)
Min Noise level : Less than 1mV (PB, DC, VOL MIN)
Less than 1.2mV (PB, AC, VOL MIN)
Erasing ratio : More than 45dB
Test tape : TTA–100
TTA–210
TTA–782
TTA–602 (NORMAL)
< TUNER SECTION >
1. AM (MW) IF Adjustment
L007 .............................................................................. 450 kHz
2. AM (MW) VT Adjustment
Settings : • Test point : TP3
• Adjustment location : L004
Method : Set to AM (MW) 1710kHz (HA, LH), 1602kHz (HR)
1611kHz (EZ) and adjust L004 so that the test point
is 6.0
±
0.05V (HA, LH), 5.6
±
0.05V (HR, EZ).
3. AM (MW) Tracking Adjustment
L003 .................................. 600kHz (HA, LH), 603kHz (HR, EZ)
TC001 ............................ 1400kHz (HA, LH), 1404kHz (HR, EZ)
4. FM VT Adjustment
Settings : • Test point : TP3
• Adjustment location : L006
Method : Set to FM 108MHz and adjust L006 so that the test
point is 6.0
±
0.05V.
5. FM Tracking Adjustment
L005 ............................................................................. 108MHz
6. LW VT Adjustment<EZ>
Settings : • Test point : TP3
• Adjustment location : L051
Method : Set to LW 288kHz and adjust L051 so that the test
point is 4.5
±
0.05V.
7. LW Tracking Adjustment<EZ>
L003 ............................................................................... 153kHz
TC051 ............................................................................ 288kHz
< CD SECTION >
8. Focus Bias Adjustment
Make the focus bias adjustment when replacing and repairing
the optical block.
1) Connect an oscilloscope to the test points TP1 (RF) and TP2
(VREF).
2) Turn on the power switch.
3) Insert test disc TCD-782 (YEDS-18) and play back the
second composition.
4) Adjust SFR430 so that RF signal of the test point TP1 (RF)
is MAX and CLEAREST.
EYE PATTERN
Must be CLEAR and MAX
MAX
VOLT / DIV: 50mV
TIME / DIV: 0.5
µ
s
RF signal waveform
Oscilloscope
(DC range)
TP3 (RF)
TP2 (VREF)
+
-
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