Sony XR-3750 Service Manual page 18

Pin No. Pin Name
42 BU IN
43 MTLSEL
44 DOLON
45 AMSIN
46 ST
47 AMS ON
48 N/R OUT
49 TAPMUT
50 ILLON
51 SD IN
52 NOSESW
53 TELMUT
54 REL T
55 ACCIN
56 TESTIN
57 RC IN1
58 PW SEL
59 MTLIN
60 ADON
61 KEYSEL
62 SEKOUTSEL
63 COLORSEL
64 LCDCE
65 LCDCKO
66 LCDSO
67 LCDINH
68 UNICKI
69 UNISO
70 UNISI
71 UNICKO
I/O
I Battery detect signal input terminal "H": battery on
METAL control in/out terminal
At initial mode: auto/manual mode selection input of METAL function "L": manual mode
At manual mode: METAL on/off control signal output terminal ("H" output: METAL on)
I/O
At auto mode: input at MTLIN (pin %ª)
Not used this function in this set (fixed at "H")
Dolby control in/out terminal
At initial mode: valid/invalid selection input of dolby function ("L" input: valid)
I/O
At normal mode: dolby on/off control signal output ("H" output : dolby on)
Not used this function in this set (fixed at "H")
Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor
I
"L": music is present, "H": music is not present
Input of FM stereo detection signal from FM/AM tuner unit (TU1), and output of forced
monaural control signal to FM/AM tuner unit (TU1) (Commonly used for stereo display input
I/O
and forced monaural output)
FM stereo detection at input of "L", forced monaural at output of "L"
Tape auto music sensor control signal output to the CXA2509AQ (IC301)
O
"L" is output to lower the gain for audio level at FF/REW
Forward/reverse direction control signal output to the CXA2509AQ (IC301)
O
"L: forward direction, "H": reverse direction
O Tape muting on/off control signal output to the CXA2509AQ (IC301) "H": tape muting on
Power supply on/off control signal output terminal at the illumination and liquid crystal display
driver (IC901) "H": power on
O
At power select switch (S501) on mode: "H" output at the accessory on
At power select switch (S501) off mode: "H" output at the power on
Station detector detect input from the FM/AM tuner unit (TU1)
I
Stop level for SEEK, BTM, etc. is determined SD is present at input of "H"
I Detects the removal of the attaching and removing type front panel block "L": attaching
I Telephone muting signal input terminal At input of "L", the signal is attenuated by –20 dB
I Reel table rotation detect signal input from the take-up and supply reel sensor
I Accessory detect signal input terminal "L": accessory on
I Setting terminal for the test mode "L": test mode (normally fixed at "H")
I Rotary remote commander shift key A/D input terminal
Power select switch (S501) input terminal
I
"L": position A (halt mode), "H": position B (operation mode)
Input terminal to set whether the auto metal function is present or not
I
"L": auto metal function is present (fixed at "H")
O Power supply on/off control signal output for the A/D conversion
I Setting terminal for the key (fixed at "H")
Active selection terminal for the SEKOUT (pin #•) (fixed at "L")
I
I Setting terminal for the illumination color "L": amber, "H": green (fixed at "H")
O Chip enable output to the liquid crystal display driver (IC901)
O Serial data transfer clock signal output to the liquid crystal display driver (IC901)
O Serial data output to the liquid crystal display driver (IC901)
Blank indicate control signal output to the liquid crystal display driver (IC901)
O
"L": no display
I Serial data reading clock signal input terminal Not used
O Serial data output terminal Not used (open)
I Serial data input terminal Not used (fixed at "L")
O Serial data transfer clock signal output terminal Not used (open)
Function
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