Haier TDVCF2016, Service Manual

Page: 41 / 46

Color Television Model
：
20S62(TDVCF2016)
4254
VCR will receive the SP-L/SP-COM/SP-R signal and record it on the tape through DRUM.
If the REC is SLP(EP) mode, the LA71207 will output the EP-L/EP-COM/EP-R signal at P72/73/74 to VCR through plug
P201. M37762 will control VCR through plug P204.
P204 is a plug for ACE-HEAD. The HEAD has AE-HEAD(audio erase head)/A-HEAD(recording or play back). It also has
the CTL HEAD to read or write the CTL+ and CTL- signal.
It is as follows.
P203 is FE-HEAD. At the REC mode, FE-HEAD first erase all the signal on the tape. Then the DRUM write the video
signal on the tape.
To ensure the normal audio signal has been erased totally, AE-HEAD is designed to erase normal audio signal again.
MM1492 gets mono sound signal of TV mode at P42/P44. It sends out the signal at P24/P26 to P7/P69 of LA72670.
Through inner curcuit, LA72670 will transfer the mono sound signal to LA71207 at P4.
LA71207 receives the signal at P10.
LA71207 will output audio signal, which are proper for VCR to record, at P11.
At the same time, M37762 outputs high voltage at P20, which are REC(H). Then audio signal is transferred through
Q209/Q208/T201. VCR can get the audio signal at P202, A.HEAD.
CTL signal is send out from P94/P95 of M37762. VCR gets the signal at P202.
(d) at TV mode,stereo sound signal,VCR working at REC mode.
The width is 1mm. It is used for normal audio signal.
The width is 10.7mm. It is used for video signal and
HiFi sound signal.
The width is 1mm. It is used for CTL signal.
A B
The width is about 5um. It is used for HiFi audio
signal.
A and B is video signal area. The width is about 54um
in SP mode.
ACE-HEAD
CTL+ and CTL- HEAD
A-HEAD. To read the normal audio signal and
write the signal to the tape.
AE-HEAD. To erase normal audio signal.