Haier TDVCF2016, Руководство по обслуживанию

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Color Television Model
：
20S62(TDVCF2016)
4154
After controlled by IIC bus, MM1492 will selected the TV out signal at P42/43 and outputs it at P36/35.
Mono sound signal is send to P8/7 of TDA7449.
TDA7449 is controlled by IIC bus. The BASS\TRABLE\BALANCE data is send to it by M37762. When it sends out the
L/R signal at P5/4, the sound signal has been dealt with.
LA4635A receives the signal at P2/4.
LA4635A will outputs the amplified sound signal at P12/8 and it is send to speakers.
At the same time, TDA7449 will send out the sound signal to REAR audio out terminal. If we connect the audio out
terminal of 2 television of this model together, then every television gets the sound from the 2 sets. The sound will mix
together at TDA7449.
(b) at TV mode, stereo sound signal(use MTS).
The picture decoding process is the same as (a).
The sound decoding process is different.
LA76834 outputs SIF signal at P67 and sends it to P57 of LA72670.
When LA72670 receives the signal, it will decoding the signal and judge it is mono or stereo or sap.
LA72670 will send out different voltage at P40. P40 of LA72670 is connected to P5 of M37762. Then M37762 will know it
is mono or stereo or sap signal.
Different types of sound signal will be processed differently. So, M37762 must know the information.
LA72670 outputs the L/R signal at P78/80 and the signal is received at P14/15(VCR in) of MM1492.
Because M37762 knows it is at the TV mode, and the sound signal is stereo, so M37762 controls MM1492 to select
signal from P14/15 for TV out.
MM1492 output stereo sound signal at P35/36(TV out).
(c) at TV mode, mono sound signal,VCR working at REC mode.
CVBS signal of TV is send to the P43 of MM1492. P37 of MM1492 will output the CVBS signal to TDA9183P. At the same
time, P23 of MM1492 will output the CVBS signal to P32 of LA71207.
After inner decoding, LA71207 will output SP-L/SP-COM/SP-R signal at P65/P66/P67. The signal can be received by
VCR through plug P201.
After the REC order is send to the M37762, P20 will output high voltage, and Q204 will be turned off. Erase signal will be
got at T201 at plug P203. This head is named FE-HEAD. It can erase all the signal on the tape.
The width of the whole tape is 12.7mm. Position of signal on the tape is as follows.