Technics RS-TR474 Service Manual page 31

RS-TR474 |
Mi TERMINAL FUNCTION OF IC
° 10701 (M38123M4101F): MICROCOMPUTER
CN2A © pin
i _ a
CN802 © pin
3 | METER-R Rch indication level input | Connector
; P CN3 @ pin
bh b e d : Connector
a
METER-L 1
Lch indication level input
CN3 © pin
, P Normal: "H" (=4.8V)
|
sae
ae
: 'a
ies
ee i
= weal
POWER
0 Power control output ON:
Connector
Power ON: "H" (=5V)
"H", OFF: "L"
CN3 @ pin
Power OFF: "L" (=0V)
: Normal: "L" (=0V)
MODEL
is Model selector terminal
_ | 10701 © pin
The deck malfunctions when set to "H".
TPS mode
No program: "H" (=5V)
Programs: "L" (=0V)
No tape load: Approx. 4.1V
Normal tape with tab: Approx. 2.3V
Deck 2 Mechanism switch
(MODE, RINH, HALF) input
No tape load: Approx. 4.1V
Normal tape with tab: Approx. OV
Chrome tape with tab: Approx. 1.1V
Metal tape with tab: Approx. 1.7V
Deck 2 Mechanism switch
(FINH, CrO., Metal,
OPEN/CLOSE) input
Connector
CN2 © pin
OV with no signal and 1V with OVU (—20dB)
input in the REC or PAUSE mode. The voltage
varies from 0 to 5V for different input levels.
TPS signal det. input ON: Connector
CN3B ® pin
"L" (=0V) when sound is being producedin the
play or REC mode and "H" (=2.5~5V) when no
sound is produced in the stop of FF/REW mode.
Connector
CN3 @ pin
Line out mute signal output
ON: "L", OFF: "H"
Connector
CN704 © pin
CN704 © pin
E2PROM chip select signal
ON: "H", OFF "L"
(ex...For t REV PLAY
i IMSL Atos sere is changed)
5V Waveform appears in
0 JILL response to 11 above.
(ex...For + REV PLAY
5V mode is changed)
0 ATL
MIL.
Waveform appears in
response to 11 above.
mode during adjustment of ATC).
Used to load output for the DA converter (IC 151).
Remocon signal input ON: 2701
bite | ats OFF cl
Connector
CN704 © pin
CN704 @ pin
E2PROM serial clock output
ON: "L", OFF: "H"
E2PROM serial data
input/output
Connector -
CN704 © pin
Connector
CN3 © pin
Audio signal for adjustment
output
H and L pulse waveform appears on the input of
a remote control signal.