Teac PD-H500C, Service Manual

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8
SERVICE MANUAL
PIN No. SYMBOL I/O FUNCTION DESCRIPTION REMARKS
Reference signal (VRO) output terminal.
VRO = 2.1 V when Vcc = 5 V
Track count signal output terminal.
Time constant adjustment terminal for bottom
detection.
RFRP signal center level output terminal.
Time constant adjustment terminal for peak detec-
tion.
Input terminal for track count signal output amp.
Output terminal for RF signal amplitude adjust-
ment amp.
Amp (AGC, FE, TE) gain switching terminal.
Input terminal for RF signal amplitude adjustment
amp.
Output terminal RF signal amp.
Ground terminal.
input terminal for RF signal amp.
TA2150FN
VRO
RFRP
BTC
RFCT
PKC
RFRPIN
RFGO
GVSW
AGCIN
RFO
GND
RFN2
19
20
21
22
23
24
25
26
27
28
29
30
-
-
Adjusted by capacitance.
-
Adjusted by capacitance.
-
-
Low (GND) is for 5 times gain.
Connected to RFO through capac-
itance.
-
-
Connected to pin-diode out-
put A + B + C + D (through
resistor).
O
O
l
O
l
l
O
l
l
O
-
l
Hiz Normal
GND CD-RW
GVSW MODE
Vcc Normal