AIWA HS-TX494YU
Service Manual

PRACTICAL SERVICE FIGURE
<TUNER SECTION>
Sensitivity : (IHF, THD 3%) FM Less than 17dB [at 87.5MHz] Less than 17dB [at 98.1MHz] Less than 17dB [at 108.1MHz] TV<591YU ONLY> Less than 19dB [at 2ch] Less than 19dB [at 4ch] Less than 19dB [at 7ch] Less than 19dB [at 10ch] Less than 19dB [at 13ch] WEATHER<591YU ONLY> Less than 19dB [at 2ch ] (S/N 10dB) AM Less than 57dB [at 630kHz] Less than 56dB [at 1000kHz] <YU ONLY> Less than 56dB [at 999kHz] <EXCEPT YU> Less than 56dB [at 1440kHz] S/N Ratio : FM More than 51dB [at 87.5MHz] More than 51dB [at 98.1MHz] More than 51dB [at 108.1MHz] AM More than 25dB [at 630kHz] More than 25dB [at 1000kHz] <YU ONLY> More than 25dB [at 999kHz] <EXCEPT YU> More than 25dB [at 1440kHz] Intermediate frequency : FM 10.7MHz ± 0.1MHz AM 450kHz ± 3kHz FM stereo separation : More than 17dB [at 98.1MHz]

<TAPE SECTION>
Tape speed : Wow & flutter : Distortion : Take-up torque : Back tension: F.F torque : Rew torque : S/N ratio : Noise level : 3000Hz ± 60Hz Less than 0.55% Less than 3.0% 30g-cm-6/+15g-cm(FWD) 30g-cm-6/+15g-cm(RVS) 2.5g-cm-1.0/+1.5g-cm(FWD) 2.5g-cm-1.0/+1.5g-cm(RVS) 110g-cm±40g-cm 110g-cm±40g-cm More than 43dB Less than 4.0mV (Vol MAX, without tape) Less than 0.3mV (Vol MIN, without tape) 63Hz � 3.5/±4.0dB ~ 8kHz � 0/± 4 dB(NORM) 63Hz � 3.5/±4.0dB ~ 8kHz � 0/± 4 dB(CrO2, METAL) TTA� 100 TTA� 210 TTA� 310(70us) TTA� 320 (120us)

Frequency response :

Test tape :

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