Electrical Adjustment; Practical Service Figure - Aiwa CSD-ED27 Service Manual

ELECTRICAL ADJUSTMENT

A MAIN C.B (PARTS SIDE VIEW)
L3
L4
TC1
TP1(VT)
L6
L5
C36 C39
IC2
IC1
4 2 1 3
<TUNER SECTION>
1. FM VT Adjustment
Settings: • Test point: TP1 (VT)
• Adjustment location: L6
Method: Set to FM 108.0 MHz and adjust L6 so that the test
point becomes 5.6 V ± 0.2 V.
2. FM Tracking Adjustment
L5 ............................................................................... 90.0 MHz
3. AM VT Adjustment
Settings: • Test point: TP1 (VT)
• Adjustment location: L4
Method: Set to AM 1710 kHz and adjust L4 so that the test
point becomes 6.0 V ± 0.2 V.
4. AM Tracking Adjustment
L3 ................................................................................. 600 kHz
TC1 ............................................................................ 1400 kHz
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L401
TP401
C404
<DECK SECTION>
5. Head Azimuth Adjustment
Settings: • Test tape: TTA-320
• Test point: J301 (Phones jack)
• Adjustment location:
Head Azimuth Adjustment Screw
Method: Play back the 8 kHz signal of test tape and adjust screw
so that the output becomes maximum.
6. Bias OSC Fequency Adjustment
Settings: • Test point: TP401
• Adjustment location: L401
Method: Set to recording mode and adjust L401 so that the test
point becomes 85 kHz ± 1 kHz
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PRACTICAL SERVICE FIGURE

<TUNER SECTION>
<FM SECTION>
IHF Sensitivity: Less than 18 dB
(THD 3 %) [at 87.5/98.0/108.0 MHz]
Signal to noise ratio: More than 58 dB
(Input - 54 dB) [at 98.0 MHz ]
Distortion: Less than 3.0%
(Input - 54 dB) [at 98.0 MHz]
Stereo separation: More than 20 dB
[at 98.0 MHz]
Intermediate frequency: 10.7 MHz
<AM SECTION>
Sensitivity: Less than 50 dB
(S/N 10 dB) [at 600 kHz]
Less than 48 dB
[at 1000 kHz]
Less than 44 dB
J301
[at 1400 kHz]
Signal to noise ratio: More than 34 dB
(Input -74dB) [at 1000 kHz]
Distortion: Less than 1.5%
(Input -74 dB) [at 1000 kHz ]
Intermediate frequency: 450 kHz
<DECK SECTION>
3000 Hz ± 60 Hz
Tape speed:
Wow & flutter: Less than 0.35%
(JIS RMS)
Take-up torque: 30 ~ 60 g-cm
F.F & REW torque 55 ~ 140 g-cm
Back tension: 1 ~ 5 g-cm
S/N ratio: More than 50 dB
(PB, SP OUT, DC)
More than 44 dB
(PB, SP OUT, AC)
Distortion: Less than 2.0%
(PB, SP OUT, DC)
Less than 2.5%
(R/PB, SP OUT, DC)
Noise level Less than 20 mV
(PB, SP OUT, VOL MAX, AC)
Less than 25 mV
(R/PB, SP OUT, VOL MAX, AC)
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