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Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this tuner.
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I have this hi-fi system for a long time and I need to repair some things. Founding this manual will be very helpfull :)
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It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
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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.
IC, LC74763M-9670
Pln No. 1 2 3 Pin Name Vss Xtal IN1 Xtal OUT1 I/o � I o Connected to ground For the connection of a crystrd and capacitors comprising a crystal oscillator that Description
generates internal sync signal. The crystal oscillator Outputs horizontal
is selected by command. can be selected (Metal
sync signal. (AFC) The output polarity port output (switched
4
HSYNCOUT
o option). Or, general-purpose by command). a crystal oscillator that
5 6 7
Xtal IN2 Xtal OUT2 VSYNCOUT
I o o
For the connection
of a crystal and capacitors comprising
generates internal sync signal. Outputs vertical general-purpose sync signal. The output polarity can be selected (Metal option). Or,
port output (switched by command).
Enable input for serial data input. �L� input enables serial data input (hysteresis input). 8 Cs I A pull-up resistor is incorporated 9 SIN I (Metal option). (Metal option).
Serial data input (hysteresis input). A pull-up resistor is incorporated
Clock input for serial data input (hysteresis input). A pull-up resistor is incorporated 10 SCLK I (Metal option). nput: Switches the SECAM 11 SECAM IJo Output General-purpose port output or internal V output (switched by command). mode. �L�: Modes other than SECAM, �H�: SECAM
InpuE Switches the number scanning lines between 525 and 625. �L�: 525, �H�: 625 12 525/625 I/o Output General-purpose port output or character data output (switched by command).
Inpu~ Switches the color system between NTSC and PAL. �L�: NTSC, �H�: PAL 13 NTsc/PAL I/o Outputi General-purpose command). Inputi Switches FSC between 3.58MHz 14 3.58/4.43 I/o Genem-purpose port output or half-tone output (switched by command). and 4.43MHz. �L�: 3.58, �H�: 4.43 Output port output or decorating data output (switched by
System reset input. Active 15 RST I (Metal option). 16 17 18 19 20 21 22 23 24 25 26 27 28 CV OUT VDD2 CVIN CVCR SYNC IN SEPC Vss PD OUT AMP IN AMP OUT FC VCO IN VCO OUT o � I I I o � o I For the connection o I I For the connection o EX-NOR 29 SYNC DET o AFC control voltage input Composite
�L�. (Hysteresis input) A pull-up resistor is incorporated
video signal output
Power supply for creating composite video level Composite SECAM video signal input
chroma signal input sync separator
Video signal input to the built-in Bias output from the built-in Connected to ground. AFC control voltage output
sync separator
of a filter for AFC circuit
of coils and capacitors comprising
an LC oscillator
for VCO
output of horizontal
sync signal (AFC) and C.SYNC
(sync sepmator). The port output
output polarity (switched
can be selected (Metal option). Or, general-purpose
by command).
30
VDD1
�
+5V Power supply of digital circuits
 $4.99 AVDV70 AIWA
Owner's Manual Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
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