This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
Hi, this is a very clear manual, nice copy, not quite up to the standard of the very best available but better than many others. I think the price was especially fair for a hard to find manual and I would certainly use this manual seller again. Recommended.
Text excerpt from page 10 (click to view)
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%.