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.
Text excerpt from page 8 (click to view)
ALIGNMENT INSTRUCTIONS
1. SERVICE MODE ADJUSTMENTS
Follow the steps below whenever service adjustment is required. See Table- A and Table- B to determine if service adjustments are required. 1) How to enter the service mode using the user remote control. � Turn the set on. � Direct the remote control to the reception window of TV. � Push buttons of remote control in sequence as follows. 1 � MUTE � DISPLAY � MUTE � Then, the screen will appear as follows.
S2
S5 S6 S8 S9 S12 S7
SCRN
IFC GEO W/B DP FACT PTRN NORMAL
� Using the channel up or channel down button, select the item you wish to adjust.
(The color of selected item turns into the red.) � Press the volume up or down button to enter in the service mode you wish to adjust. 2) How to memorize the adjusted values in the service mode. � Must press DISPLAY button the state which the screen is displaying each of service menus after all adjustments are completed each of all service menu. Table-A : Adjust the values of service mode when a part is replaced.
PART REPLACED
I701 (U-COM) I101 (MAIN)
ADJUSTMENT NECESSARY UNNECESSARY
O O Data is stored in I703.
NOTES
Initial setting values are written from I701. Adjusting Items I703 (EEPROM) O
S5 S6 S8 S9 RFAGCD H.PHASE/V.POSI/V.SIZE RD/BD/RB/GB/BB Subbrightness
CRT
O
Adjust items related to picture tube only.(White Balance adjustment)
