Sony XR-4790 Service Manual page 25

Pin No. Pin Name
37 AM STIN
38 SEKOUT
39 MW SW
40 BEEP
41 KEYACK
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 KEYACT
61 KEYSEL
62 SEKOUTSEL
63 COLORSEL
64 LCDCE
I/O
I AM stereo detection signal input terminal Not used (fixed at "L")
O Seek control signal output to the FM/AM tuner unit (TU1)
O MW selection signal output terminal Not used (open)
O Beep sound output terminal
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
I
and eject keys in the power off status On at input of "L"
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 "H": METAL on
I/O
At auto mode: input at MTLIN (pin %ª)
XR-4790: Not used this function in this set (fixed at "H")
XR-4800: Used for the this function
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": 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 (S801) on mode: "H" output at the accessory on
At power select switch (S801) 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
Telephone muting signal input terminal
I
At input of "L", the signal is attenuated by –20 dB Not used (fixed at "H")
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 (S801) 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 #•)
I
I Setting terminal for the illumination color "L": amber, "H": green Not used (fixed at "L")
O Chip enable output to the liquid crystal display driver (IC901)
Function
– 38 –