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Very fast service, best quality of the service manual and the schematics
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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.
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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.
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This schema available for me in good condition. I would highly recommend.
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Thanks for this "hard to find" service manual.
I apreciate the good quality of scanning and the pages scanned in A3 format.
MDCT-1000
� Connecting the LCD Controller with LCD
LCD controller WF LP XSCL YDIS YD AND CP LP DELAY LCD DF
3-4-2. LCD Dot Check (Lighting All Dots) Lighting all dots of LCD (Graphic data: By 0xff transfer)
04-02
LOAD
3-4-3. Checking the LCD Dot (Turning off all dots) All dots of LCD are turned off. (Graphic data : By 0x00 transfer)
04-03
FRAME
D0 D1 D2 D3
3-4-4. Test Signal Output from Microprocessor to LCD Controller Test signal output is under preparation.
04-06 NOW test signal loading...
XRES OR
DISP
Test signal is under preparation. 0xff and 0x00 are output repeatedly to the microprocessor ports D15 to D8 as follows.
Reset IC PA4 (Microprocessor)
3-4-1. Connection Check between Microprocessor and LCD Controller, and between LCD Controller and SRAM � Check the checksum of the font and the graphic data that are transferred to SAG1 (F000h to FFFFh) of the SRAM for display when releasing the STANDBY mode.
[Calculation is under way.] 04-01 (data read from LCD cntr) = ????????
About 0.25 S 0.25
0.25
0.25 About 30 seconds
The test signal output ends.
04-06 finished test signal output
3-5. Key Test: [KEY]
05-00 /* KEY TEST MANU */ 05-01 05-02 05-03 KEY INCREMENT TEST ANY KEY TEST K_mode LOG
� When [OK] appears: Connection between the microprocessor and LCD controller and the connection between LCD controller and SRAM are correct.
04-01 (data read from LCD cntr) = xxxxxxxx
[OK]
3-5-1. Key Test by Pressing Keys in Order
05-01 /* KEY INCREMENT TEST */ Turn ON � DISPLAY(A)
� When [NG] appears: 1. If the following *NG display is recognized, �XRD� is suspected. 2. If the following *NG display is not recognized (upon confirmation through trace monitor), either one of the connections between microprocessor and LCD controller or the connection between LCD controller and SRAM or the connection between LCD controller and LCD is defective. (At this time, if the test signal is output from the microprocessor to LCD controller in step 04-06, whether the connection is OK or NG can be confirmed, and also which of the connections between LCD controller and SRAM or the connection between LCD controller and LCD is NG.)
04-01 (data read from LCD cntr) = KKKKKKKK [NG] Mabye read pattern NG. or. [LCD_cntr]-[u_com],[h_sram]: connect NG
When the specified �DISPLAY (A)� key is pressed correctly, the following messages appear.
05-10 /* KEY INCREMENT TEST */
� DISPLAY(A) OK Turn OFF
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