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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.
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Helpd me mont a new carradio when prewius mont was a mess.
SECAM CHROMA ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions 1 BELL FILTER f0 1 Receive Oi-5CH(SECAM colour bar). (SCM BELL) 2 Select the "SCM BELL" fo adjustment mode. I2C bus 3 Connect the oscilloscope to TP901 of main. adjustment (TP2901 in VCJ unit) Range : 10mV/Div. (AC) Sweep time: 20µsec/Div. (10:1 probe is used.) 4 Vary the bell filter data to align the waveform to be the nearest to that in Fig. 5 (b). (Arrange the level to gain the whole balance.) Waveform and others
SOUND LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions 1 SUB SOUND 1 Receive E-12ch (PAL colour bar). Signal con(SUB VOL) tent: 400Hz 100% Mod. (I2C bus 2 Connect the probe of the meter to (SI) conadjustment) nector. (See Note) 3 Select "SUB VOL" in the service mode. 4 Adjust the sub-sound data to make the meter indicate 8.5Vrms (at L-ch). Adjustment value : 8.5 ± 0.4Vrms Waveform and others Note: * SPATIALIZER ..... OFF * S-Normal state * S-VOL ................ Max * S-BOOSTER ...... OFF
adjust
Fig. 5( a)
Fig. 5 (b) * To be at the same levbel. 2 SECAM black level R-Y/B-Y (R-Y and B-Y) I2C bus adjustment 1 Receive Oi-5CH(SECAM colour bar). 2 Select SECAM black level adjustment "R-Y" mode. 3 Connect the oscilloscope to TP802 (TP2804 in VCJ unit) of the main. Range: 10mV/Div. Sweep time: 20µsec/Div. (10:1 probe is used.) 4 Vary R-Y data to minimize the offset between the non-signal line and signal line as shown in Fig. 6 (b). 5 Select SECAM black label adjustment "B-Y" mode. 6 Reconnect the oscilloscope to TP803 (TP2805 in VCJ unit) of the main. The conditions are the same as in Item (3). 7 Vary B-Y data to minimize the offset between the non-signal line and signal line as shown in Fig. 7 (b). Fig. 6 (b) 2 Noise mute check 1 Receive E-12CH (PAL colour bar). 2 Maximize the sound volume to verify that the sound is output from the speaker. Then, set the non-signal state. 3 At this time, verify that the audio mute operates. 4 After checking the operation, set the sound volume to be the minimum. Fig. 6 (a)
OFF SET
SIF (NICAM/IGR) ADJUSTMENT
NO. Adjustment part 1 VCO COIL T2300 (in the NICAM unit) Adjusting procedure and conditions 1 Receive E-69CH (PAL colour bar). (Set the receiving frequency at AFT OFF Ex. E-69=855.25 MHz.) 2 Connect the digital voltmeter to TP301 (in the main unit). 3 Verify that it is turned counterclockwise to 0V and clockwise to 5V, and adjust T2300 to make the DC voltage of TP2300 become 2.5 ± 0.1V in the range. <Single-unit adjustment> - For your Reference. Vcc 5 ± 0.1V IF input frequency 38.9MHz ± 10kHz Control it under these conditions.
OFF SET
Waveform and others
7
Fig. 7 (a)
Adjust T2300 to make the DC voltage of TP2300 (in the NICAM unit) become 2.5 ± 0.1V. After single-unit adjustment, check the practical setup. Align the receiving frequency to the select channel frequency. (AFT OFF) The checked TP301 in the main unit voltage must be 2.5 ± 1.0V. (Take care that ±1.0 is considered for the Vcc difference between the single unit and unit, Fo difference and so on, but is not the adjustment precision.)
SX68JF100
Fig. 7 (b)
7-1
7-2
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