Teac CTM6845, Service Manual

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Pin
①
Tuning voltage output (functioning only to VST tuner, and it has no output
when the IIC bus has identified the presence of a FST tuner.)
Pin
② left channel volume control output
Pin
③
right channel volume control output (Note: Pins
②
and
③
have PWM
output only when there is no output from IIC)
Pin
④
woofer switch (Note: there is level output only when IIC has not identified
the presence of the TDA9680 sound chip) 0=OFF 1=ON
Pin
⑤ sound system identification circuit input, can be used as automatic
identification function for sound system (Note: not used in this machine)
Pin
⑥ video signal identification output, when there is video signal in the current
program signal (including AV): 1=presence of video signal 0=no video signal
(not used in this chassis)
Pin
⑦ 1=switching to S-VHS signal input at port 0=switching to other signal
source (not used in this chassis)
Pin
⑧ for control of the working status of comb filter
0=NTSC 1=PAL/SECAM status
It is used in 25” and 29” models, for control of pillow distortion equalizing circuit in
N system
Pin
⑨
local key
Pin local key
Pin not used
Pin AV/TV status output 1=TV 0=AV
Pin sound system output
Pin sound system output mainly as follows:
(13) system (14) system Sound system
0 0 M
0 1
D/K
1 0 I
1 1 BG
Pin mute (not used in this chassis as under mute status, the N701
①②
pin DC
control level automatic output is 0)
1=no mute 0=mute
Pin LED driven output
0=LED highly lit, indicating a stand-by status or is receiving remote control signal
1=LED slightly lit, indicating usual status
Pins Band control output, only to VST tuner
(17) (18) Band
0 0 VHF-L
1 0 VHF-H
1 1 UHF
Pin AV3 status not used at present
1=AV3 status 0=other status
Pin AV1 and AV2 status
1=AV1 TV/AV2=0
10
11
12
13
14
15
16
17
18
19
20