ADJUSTMENT
A MAIN C.B
11
VOLUME
4 3 1
2
J101 PHONES
VR101
1 1
2
TP2 (RCH) TP1(LCH) TP3 (GND)
2 2
SFR301
2
1. Dolby Level Adjustment <AE> Setting : � Test tape : TTA � 200 � Test point : TP1 (RCH), TP2 (LCH) � DSL : OFF � Tape selector : NORMAL (AUTO) � Dolby SW : OFF � Volume : MIN � Adjustment points : Soldered patterns 1 � 4 Procedure : Short the patterns via solder as shown in the table so the Dolby NR level is 32 mV ± 1.0 dB. Adjust so the specifications are satisfied in both the forward and reverse directions. Connect 10µF /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 + 0.8 dB Lch
2 1 3
2. Tape Speed Adjustment Settings : � Test tape : TTA � 100 (Tape center) � Test point : Phones Jack (J101) � Adjustment location : SFR301 � Dolby : OFF � DSL : OFF � Tape selector : NORMAL (AUTO) � Volume : MAX Method : Play back (FWD) the test tape and adjust SFR301 so that the frequency becomes 3015 Hz ± 10 Hz. Then confirm WOW is less than 0.50%.
only and 2 only only and 4
+ 1.5 dB + 2.5 dB + 0.8 dB + 1.5 dB + 2.5 dB
Rch
4 3
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