Function Description - Teac PD-H500C Service Manual

TA2150FN
PIN No. SYMBOL
1 VCC
2
RFGC
3 GMAD
4 FNI
5 FPI
6 TPI
7 TNI
8 MDI
9 LDO
10 SEL
11 TEB
12 2VRO
13 TEN
14 TEO
15
SBAD
16 FEO
17 FEN
18 SEB
I/O

FUNCTION DESCRIPTION

- Power supply input terminal.
RF amplitude adjustment control signal input termi-
nal.
I
Controlled by 3-PWM signals.
(PWM carrier = 88.2kHz)
Open loop gain adjustment terminal for AGC amp.
l
l
Main beam l-V amp input terminal.
Main beam l-V amp input terminal.
l
Sub beam l-V amp input terminal.
l
Sub beam l-V amp input terminal.
l
Monitor photo diode amp input terminal.
l
Laser diode amp input terminal.
O
Laser diode control signal input terminal and APC
circuit ON/OFF control signal terminal.
SEL APC
LEVEL CIRCUIT
l
Connected to Vcc
OFF
GND
through resister (1 k )
Hiz ON Control signal output
Control signal output
Vcc ON
Tracking error balance adjustment signal input ter-
l
minal. Controlled by 3-PWM signal.
(PWM carrier = 88.2 kHz)
Reference voltage (2VRO) output terminal.
O
2VRO = 4.2 V when Vcc = 5 V
l
TE amp negative input terminal.
O TE error signal output terminal.
Sub beam adder signal output terminal.
O
Focus error signal output terminal.
O
FE amp negative input terminal.
l
RFRP output circuit suitching terminal.
SEB LEVEL
l
GND
GND
SERVICE MANUAL
DETECT
LDO
FREQUENCY
Low
Low
High
BOTTON PEAK
DETECTION DETECTION
GND GND
GND
GND
REMARKS
-
3 signals input.
(2VRO, VRo, GND)
(Note 1)
Connected to pin diode
output B + D
(through resistor)
Connected to pin diode
output A + C
(through resistor)
Connected to pin diode
output F.
Connected to pin diode
output E.
Connected to pin monitor
photo diode.
Connected to laser diode
control circuit.
3 signals input.
(Vcc, Hiz, GND)
3 signals input
(2VRO, VRO, GND)
-
Connected to TEO through
feedback resistor.
-
-
-
Connected to FEO through
feedback resistor.
Low (GND) is for normal use.
7