Service manual

74
HCD-GNZ55D
IC403 BH2210FV-E2 (SIGNAL IN/OUT CONTROL) (MAIN BOARD (2/4))
Pin No. Pin Name I/O Pin Description
1 CTLIO I IN/OUT control port (Fixed at “H” in this set.)
2 RESET I Reset signal input
3 CLK I Serial data clock signal input
4LATCH I Serial data latch signal input
5 TC-MUTE O Tape playback muting on/off control signal output “H”: muting on
6 NO USE O Not used. (Open)
7 REC MUTE O Recording muting on/off control signal output “L”: muting on
8 NO USE O Not used. (Open)
9SM-NSP-MUTING O
S master processor IC PWM 50% duty muting on/off control signal output
“L”: muting on
10 SM-SOFT-MUTING O S master processor IC soft muting on/off control signal output “L”: muting on
11 SM-PG-MUTE O S master processor IC PWM muting on/off control signal output “L”: muting on
12 SM-INIT O Initialization signal to the S master processor IC
13 LATCHO O Serial data latch output signal Not used. (Open)
14 CLKO O Serial data clock signal output Not used. (Open)
15 DO1 O Serial data signal output 1 Not used. (Open)
16 DI2 I Serial data signal input 2 Not used. (Connect to ground.)
17 A-TRIG O Deck A side trigger plunger drive signal output “H”: plunger on
18 CAMP-CNT O Capstan motor drive signal output
19 B-TRIG O Deck B side trigger plunger drive signal output “H”: plunger on
20 REC BIAS O Recording bias on/off control signal output “H”: bias on
21 TC RELAY O Recording/playback selection signal output “H”: recording, “L”: playback
22 ADC RESET O Power down control signal to analog to digital converter “L”: power down
23 NO USE O Not used. (Open)
24 FAN CTRL O Fan driving signal output “L”: fan on Not used in this set. (Open)
25 DO2 O Not used. (Open)
26 DI1 I Serial data signal input
27 VSS — Ground pin
28 VDD — Power supply pin (+3 V)