Technics RS-TR474 Service Manual page 32

| RS-TR474
5V Rectified waveform at
{VYYY both 50 and 60Hz
Power off det. input ON: Connector 0 (clamping at 5V)
"H", OFF: "L" CN3 @ pin
The microprocessor goes into standby mode
when this signal is removed.
Usually H (=5V) but L
A few tens fora period of afewtoa
few tens of
milliseconds is first
plugged in when the
player.
Reset input ON: "L",
OFF: "H" 10701 @ pin
Serial data output for DA
converter (1C151)/serial- Connector Data output in response
paraliel converter (10152) CN3 © pin to 21
ON: "H", OFF: "L"
Serial clock output for DA Afew us A tew ms
converter (1C151)/serial- Connector Pp
parallel converter (1C152) - ° | CN3@ pin
ON: "H", OFF: "L"
Pulse signal is emitted
only when a mode
change occurs.
Microcomputer clock OSC 2702 © pin , . . . + Oscillator waveform at
terminal terminal ; 6MHz
Microcomputer clock OSC. 2702 @ pin Oscillator waveform at
terminal - | terminal ; 6MHz
Microcomputer GND . 10701 @ pin
Serial data is sent to: 1C801, IC802, and the
Connector mechanism driver IC.
CN2 @ pin Select the Deck 2 data from this serial data and
load it into 1C802.
Latch output (Deck 2) for
mechanism control ON: "H",
OFF: "L"
Latch output (Deck 1) for
mechanism control ON: "H",
OFF: "L"
Connector Select the Deck 1 data from the serial data and
CN1 © pin load it into |C801.
Serial data output for Connector
mechanism contro! ON: "H", | CN1 © pin
OFF: "L" CN2 © pin
Serial data used to control the mechanism driver
via 1C801 and iC802.
Serial clock output for Connector
mechanism contro! ON: "H", | CN1 ©@ pin Emitted only when mechanism mode changes.
OFF: "L" CN2 © pin
About About 4ms
0.5ms
FL meter segment output +8V
ON: "H", OFF: "L" es
~20V
+
FL meter glid output ON: 0 Salle
"H", OFF: "L" -20V "2
H for 0~8 pulses of duration
approx. 0.5ms each.