Panasonic SA-AK78, Service Manual

Page: 13 / 84

Pin No. Mark I/O Function
1 PDE I Tracking signal input 1
2 PDF I Tracking signal input 2
3 VCC I Power supply
4 PDA I Focus signal input terminal 1
5 PDB I Focus signal input terminal 2
6 LPD I APC amp input
7 LD O APC amp output
8 RF O RFsumming output
9 RFIN I Detector’s input
10 CSBRT I Capacitor for OFTR connection
11 CEA I Capacitor for HPF amp connection
12 BDO O BDO output (“H” : drop out)
13 LDON I APC control
14 GND — Ground
No. Mark I/O Function
1 BCLK O N.C.
2 LRCK O N.C.
3 SRDATA O N.C.
4 DVDD1 I Power supply input (for digital
circuit)
5 DVSS1 I GND (for digital circuit)
6 TX O Digital audio interface signal
output (Latches data at first
transition)
7 MCLK I Microprocessor command
clock signal input
8 MDATA I Microprocessor command
data signal input
9 MLD I Microprocessor command
load signal input
10 SENSE O Sense signal output (OFT,
FESL,MAGEND,NAJEND,PO
SAD,SFG) (Not used, open)
11 /FLOCK O Focus servo feeding signal
output (“L” : Feed)
12 /TLOCK O Tracking servo feeding signal
output (“L” : Feed)
13 BLKCK O Sub-code block clock signal
output
(BLKCKf = 75Hz
during normal playback)
14 SQCK I External clock signal input for
sub-code Q resistor
15 SUBQ O Sub-code Q code output
16 DMUTE I Muting input (“H” : mute)
17 STAT O Status signal output
(CRC,CUE,CLVS,TTSTVP,F
CLV,SQCK)
18 /RST I Reset signal input
19 SMCK O 1/2-diveded clock signal of
crystal osscillating at MSEL =
“H” (fSMCK = 8.4672 MHz)
1/4-divided clock signal of
crystal oscillating at MSEL =
“L” (fSMCK = 4.2336 MHz)
20 CSEL I Frequency Selection Terminal
H = 33.8688 MHz ; L =
16.9344 MHz
21 TRV O N.C
22 TVD O Traverse drive output
23 PC O Spindle motor ON output ("L"
: ON)
Pin No. Mark I/O Function
15 /RFDET O NRFDET output (“L” : detection)
16 PDOWN O Power-down input
17 OFTR O OFTR output
18 NC O N.C.
19 ENV O 3T-ENV output
20 NC I N.C.
21 NC I N.C.
22 TEN I TE amp input
23 TEOUT O TE amp output
24 FEOUT O FE amp output
25 FEN I FE amp input
26 VREF O Reference voltage output
27 TBAL I Tracking balance control
28 FBAL I Focus balance control
No. Mark I/O Function
24 ECM O Spindle motor drive signal
output(forced mode output)
25 ECS O Spindle motor drive signal
output
(servo error signal output)
26 KICK O N.C.
27 TRD O Tracking drive output
28 FOD O Focus drive output
29 VREF I D/A (drive) output (TVD, ECS,
TRD,
FOD, FBAL, TBAL)
Reference voltage input
30 FBAL O Focus balance adjustment
output
31 TBAL O Tracking balance adjustment
output
32 FE I Focus error signal input
(analog input)
33 TE I Tracking error signal input
(analog input)
34 RFENV I RF envelope signal input
35 VDET I Vibration detection signal
input ("H" :detection)
36 OFT I Off-track signal input ("H" : off
track)
37 TRCRS I Track cross signal input
38 /RFDET I RF detection signal input ("L"
: detection)
39 BDO I Dropout signal input ("H" :
Dropout)
40 LDON O Laser on signal output ("H" :
ON)
41 PLLF2 I/O N.C.
42 DSLF2 O Tracking Offset alignment
output/DSL Balance Output
(DA Output)
43 WVEL O N.C.
44 ARF I RF signal input
45 IREF I Reference current input
46 DRF I DSL bias terminal (Not used,
open)
47 DSLF I/O DSL loop filter terminal
48 PLLF I/O PLL loop filter terminal
49 VCOF I/O VCO loop filter terminal
50 AVDD2 I Power supply input (for
analog circuit)
51 AVSS2 I GND (for analog circuit)
12 Terminal Function of IC’s
12.1. IC701 (AN8839NSBE2) Servo Amplifier
12.2. IC702 (MN662790RSC) Servo processor/ Digital signal processor/
Digital filter/ D/A converter
13
SA-AK78