Sony XR-C8200, Руководство по обслуживанию

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SECTION 6
DIAGRAMS
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MAIN BOARD IC101
µ
PD78013GC-761-AB8 (TUNER CONTROLLER)
Pin No. Pin Name I/O Function
1 TUNON O Tuner system power supply on/off control signal output to the BA3918 (IC601) “H”: tuner on
2 FM ON O FM system power supply on/off control signal output to the BA3918 (IC601) “H”: FM on
3 to 8 NCO O Not used (open)
9 VSS — Ground terminal
10 to 23 NCO O Not used (open)
24 VSS — Ground terminal
25 to 32 NCO O Not used (open)
33 TUNMUT O FM and AM signal muting on/off control output “H”: muting on
34 RAMBU I
35 RESET I
System reset signal input from the system controller (IC501), reset signal generator (IC551) and
reset switch (S551) “L” is input for several 100 msec after power on, then it changes to “H”
36 NCO O Not used (open)
37 BU IN I
Battery detect signal input from the SONY bus interface (IC571) and battery check circuit
“H”: battery on
38 NCO O Not used (open)
39 BUSON I
Bus on/off control signal input from the system controller (IC501) (for SONY bus)
“L”: bus on
40 VDD — Power supply terminal (+5V)
41 OSCOUT O Main system clock output terminal (8 MHz)
42 OSCIN I Main system clock input terminal (8 MHz)
43 GND — Ground terminal
44 XT OUT O Sub system clock output terminal Not used (pull down)
45 XT IN I Sub system clock input terminal Not used (fixed at “L”)
46 AVSS — Ground terminal (for A/D converter)
47 VSM I FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU11)
48 DSTSEL1 I Destination setting terminal (fixed at “L”)
49 DSTSEL0 I Destination setting terminal (fixed at “H”)
50 SD IN I
Station detector detect input from the FM/AM tuner unit (TU11)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
51 ST MONO I/O
52 to 54 NIL I Not used (fixed at “L”)
55 AVDD — Power supply terminal (+5V) (for A/D converter)
56 AVREF I Reference voltage input terminal (+5V) (for A/D converter)
57 PLL SI I PLL serial data input from the FM/AM PLL (IC91)
58 PLL SO O PLL serial data output to the FM/AM PLL (IC91)
59 PLLCKO O PLL serial data transfer clock signal output to the FM/AM PLL (IC91)
60 PLLCE O PLL serial chip enable output to the FM/AM PLL (IC91)
61 LINKOFF O Unilink on/off control signal output (for SONY bus) “L”: link off
62 UNISI I Serial data input from the SONY bus interface (IC571)
63 UNISO O Serial data output to the SONY bus interface (IC571)
64 UNICKI I Serial data reading clock signal input from the system controller (IC501) (for SONY bus)
Input of FM stereo detection signal from FM/AM tuner unit (TU11), and output of forced
monaural control signal to FM/AM tuner unit (TU11) (Commonly used for stereo display input
and forced monaural output)
FM stereo detection at input of “L”, forced monaural at output of “L”
Internal RAM reset detection signal input from the RN5VD23AA (IC552)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset
6-1. PIN FUNCTION DESCRIPTION