NAD C715, Service Manual

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3. Pin Functions
Note: 3AI/F : 3 V circuit analog input/output pin
3I/F : 3 V circuit digital input/output pin
1.5AI/F : 1.5 V circuit analog input/output pin
Pin
No.
Pin name I/O Description Remark
1 RFZI
I
3AI/F
Input pin for the RF ripple zero-cross
signal. To be connected to the
RFRP via 0.033 uF.
2 AVSS3 — Grounding pin for 3.3 V analog circuits. —
3 RFRP
O
3AI/F
RF ripple signal output pin. —
4 FEI
O
3AI/F
Focus error signal input pin.
5 SBAD/RFDC
O
3AI/F
Subbeam addition signal input pin.
6 TEI
O
3AI/F
Tracking error signal input pin.
Monitor pin for various
signals.
7 TEZI
I
3AI/F
Input pin for tracking error signal
zero-cross. To be connected to the
TEI via 0.033 uF.
8 AVDD3 — Supply voltage pin for 3.3 V analog circuit. —
9 FOO
O
3AI/F
Focus equalizer output pin. —
10 TRO
O
3AI/F
Tracking equalizer output pin. —
11 VREF
O
3AI/F
Analog reference supply voltage pin.
Connected to the VRO
and PV
REF
within the IC.
To be connected to 0.1
uF.
12 FMO
O
3AI/F
Speed error/feed equalizer output pin.
13 DMO
O
3AI/F
Disc equalizer output pin.
PWM ternary output
(AVDD3, GND, and
V
REF
).
14
SBSY
(SPCK) O
3I/F
Pin for outputting the subcode block sync
signal. It is "H" at position S1 when the
subcode sync signal is detected.
(CD Processor Status Read
Clock(176.4KHz) output)
“H” at S1 when Subcode
Sync is detected.
15
SBOK
(FOK)
(CLCK)
(MBOV)
O
3I/F
Pin for outputting the CRCC check result of
a subcode Q data check. It is "H" when the
check result is OK.
(Focus OK signal)
(Input/output pin for the clock used in
reading the subcode P to W data.)
(CD Buffer memory overflow output)
—
16
IPF
(SPDA) O
3I/F
Correction flag output pin.
"H" if the AOUT pin outputs an
uncorrectable symbol in C2 correction.
(CD Processor Status signal output)
—