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some of the writing is a bit blur but the part in the schmatic was great and i have fixed the machine thanks
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Well.. I'd searched for this manual and although I found many copies online I was pleased to find your website with a well balanced pricing system and easy to search and follow links. That together with the very quick response time was just what I was looking for.. being a very impatient tech.. ;-) I had the service manual in front of me within a short time.
Bookmarked.. and you can bet I will always come here first for my service & user manuals..
best regards
Ed(Tony) Foley
G7WHK
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I will definitely be back for more information when I need it.
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The service manual when downloaded and printed out was clear and easy to read. I would have liked to have been able to enlarge some details, but this was not possible as the file permissions did not allow this. The service was very good. The time taken from placing my order to downloading the document was only a few minutes.
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The manual is useful for trouble shooting for an old instrument. It saved money,and let me enjoy DIY.
ADJUSTMENT
A MAIN C.B
1
2
2
VOLUME VR101
SFR 301
1
2
3
IC301
TP2 (L-CH)
TP1 (R-CH)
2
4
2
GND
IC701
PHONES J101
1
<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
only and 2
+1.5dB +2.5dB +1dB +1.5dB +2.5dB
Rch
only 4 only 3 and 4
1 1
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