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ADJUSTMENT
A MAIN C.B
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2
2
VOLUME VR101
SFR 301
1
2
3
IC301
TP2 (L-CH)
TP1 (R-CH)
2
4
2
GND
IC701
PHONES J101
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<TAPE PLAYER SECTION>
1. Tape Speed Adjustment Settings : � Test tape : TTA � 100 (Tape center) � Test point : Phones Jack (J101) � Adjustment location : SFR301 � Dolby : OFF � MSP : CLASSIC � DSL : OFF � Tape selector : NORMAL(AUTO) � Volume : MAX Method : Play back (FWD) the test tape and adjust SFR301 so that the frequency becomes 3015Hz ± 10Hz. Then confirm WOW is less than 0.50%.
PRACTICAL SERVICE FIGURE
<TAPE SECTION>
Tape speed : Wow : Take-up torque : F.F torque : REW torque : Back tension : S/N ratio : Distortion : Noise level : 3015Hz ± 50Hz Less than 0.55% (RMS) 20 ~ 30g-cm (FWD) 70 ~ 150g-cm 70 ~ 150g-cm 1.0 ~ 3.0g-cm (FWD) More than 42dB (PB, DC) Less than 3.0% (PB, DC) Less than 3.0mV (Vol MAX, PB, DC) Less than 0.4mV (Vol MIN, PB, DC) 63Hz + 3 / � 5dB ~ 8kHz + 4 / � 4dB (NORMAL) 63Hz + 3 / � 5dB ~10kHz + 4 / � 4dB (CrO2) TTA � 100 TTA � 200 TTA � 320(NORMAL) TTA � 310(CrO2)
2. Dolby Level Adjustment Frequency response : Setting : � Test tape : TTA � 200 � Test point : TP1(RCH),TP2(LCH) � DSL : OFF � Tape selector : NORMAL Test tape : � Dolby SW : OFF � Volume : MIN � Adjustment points : Soldered patterns 1 � 4 Procedure : Short the patterns via solder as showen in the table so the Dolby NR level is 24.5mV ± 1.0dB. Adjust so the specifications are satisfied in both the forward and reverse directions. Connect 10mF /16V coupling capacitors between test points and test equipment (connect the positive terminals to the test points). SOLDER PATTERN 1 � 4 STANDARD : 24.5 ± 1.0dB SOLDER POINT INCRESE LEVEL 1 only +1dB Lch
2 1 3
