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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.
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.
This schema available for me in good condition. I would highly recommend.
Thanks for this "hard to find" service manual.
I apreciate the good quality of scanning and the pages scanned in A3 format.
Helpd me mont a new carradio when prewius mont was a mess.
CONVERGENCE CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
NO. Adjustment part Adjusting procedure conditions Waveform and others NO. Adjustment part Adjusting procedure conditions Waveform and others 1 CRT CUTOFF 1. Switch TV to VIDEO mode, BLUE BACK OFF, 1 CONVERGENCE 1. Receive the âCrosshatch Patternâ signal. ADJUSTMENT with NO VIDEO signal. CONTROL) 3. Connect the oscilloscope to Red OUT from IC801.(TP851 (14")/TP852 (20"/21")) R Range : 1 V/Div (DC) Sweep : 5 msec/Div
RGB 2. Turn the 6-pole magnet to a proper opening
1 V colours.
14BM2, 14BM2S/G 20BM2, 20BM2S/G 21BM2, 21BM2S/G
B G adjustment.) Static convergence
ADJUSTMENT 2. Using the remote controller, call NORMAL (I C BUS 2. Press R/C to set Picture Normal condition. (To be done mode.2 after the purity
1. Turn the 4-pole magnet to a proper opening
angle in order to superpose the blue and red Fig. 5-1
0 4. Adjust SCREEN VR, so that the tip of signal
angle in order to superpose the green colour reach 3.0 Â±0.1 Vdc. Fig. 6 over the blue and red colours. G 2 SUB1. Call âSUB-BRIâ in service mode. (Receive B Fig. 5-2 2 screen in the following steps. (I C BUS that line 1, 2 and 3 have the same darkness
B 2 3 and finally line 5 will be the brighter 1, 2 and 3 are in same black level. R
Dynamic convergence BRIGHTNESS Crosshatch pattern with 5 black level windows) 1. Adjust convergence on fringes of the ADJUSTMENT 2. Adjust the âSUB BRIGHTâ bus data in order 1 2 3 4 5 wherelse 4 is slightly brighter than line 1, a) Fig. 5-1: Drive the wedge at point âaâ and RGB CONTROL) swing the deflection coil upward. than line 4. b) Fig. 5-2: Drive the wedge at points âbâ and R
Fig. 7 âcâ and swing the deflection coil * 12,300Â°K X : 0.272 c) Fig. 5-3: Drive the âcâ wedge deeper and BALANCE nal.
downward. 3 WHITE 1. Receive the âWHITEâ pattern with BURST sigRefer to Page ????. Fig. 5-3 2. Press R/C to set Picture NORMAL condition. Y : 0.275 swing the deflection coil rightward. SERVICE
R (-) and TP603 (+). Y : 0.255
BGR MODE 3. Connect DC miliammeter between TP602 * 18,000Â°K X : 0.255 d) Fig. 5-4: Drive the âbâ wedge deeper and
2. Fix all wedges on the CRT and apply glass (I C BUS 4. Check Beam current should be around 1,100 ÂµA B & DRI-BS data to have a colour temperature *Note: Above Data can be UP/ magnet unit (purity, 4-pole, 6-pole magnets) * Note . 6. Receive âWHITEâ pattern, WITH BURST signal, LOW HIGH Finally received the Red-only and Blue-only Wedge "a"
100Â° LUMINATE Y signal.
swing the deflection coil leftward. ADJUSTMENT G
tape over them. CONTROL) (20"&21") (14" around 800 ÂµA). (MINOLTA COLOUR ANALYZER Fig. 5-4 of 12,300Â°K or 7,500Â°K (white). DOWN by Volume key. and magnet unit lock screw.
3. Apply lacquer to the deflection yoke lock screw, 5. Set it to service mode and adjust the DRI-GS, CA-100)
Wedge "c" Note: This adjustment must be done after "b"
and set BRIGHTNESS Y by generator, to ** 14" 10 200 cd/m2 signals to make sure there is no other colours (MINOLTA CA-100) by reducing 20"/21" 10 120 cd/m2 on the screen. About 7. Adjust âCUT-Râ & âCUT-Gâ to get desired colour temperature. Then go back NORMAL mode Lacquer (HIGH BRIGHT**) to check colour temperature. If out 14â back to (1)
4-pole magnet CRT neck
warming up the unit for 30 minutes or longer with a beam current over 700 (20"&21") ÂµA. (For 14", the beam current should be 6-pole magnet over 500 ÂµA) * Adjust DRI-GC/GW, DR-BC/BW as following data, after finishing DRI-BS and DRI-GS data * 12,300Â°K DRI-GW=âDRI-GSâ-7 adjustment. DRI-BW=âDRI-BSâ-7 DRI-RW=32 (FIXED), DRI-GW=âDRIGSâ-7*, DRI-BW=âDRI-BSâ-7* * 18,000Â°K DRI-GC=âDRI-GSâ 20cm
Purity magnet DRI-GC=âDRI-GSâ-7* DRI-RC=27
Lacquer (21") DRI-RC=25, DRI-BC=âDRI-BSâ, DATA-5
Fig. 5-6 (14") 4 MAXIMUM 1. Receive the âMonoscope Patternâ signal. BEAM CHECK 2. Press R/C to set Picture NORMAL condition. 3. Connect the DC miliammeter between TP603 4. Beam current must be within 1,100 Â±100ÂµA
(+) and TP602 (â). (Full Scale: 3 mA Range) (21") 800 Â± 100 ÂµA(14") .