Philips AZ9015 Service Manual page 16

TA2120FN – Stereo Headphone Amplifier
Pin Name Direction
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→ headphone-amp
1 DBB NF
headphone-amp →
2 ADD OUT
→ headphone-amp
3 RF IN
→ headphone-amp
4 PWC
5 VCC +A
headphone-amp → HP-socket
6 B
headphone-amp → HP-socket
7 C
headphone-amp → HP-socket
8 A
9 GND GND
headphone-amp →
10 MIX OUT
→ headphone-amp
11 ALC IN
→ headphone-amp
12 ALC DET
→ headphone-amp
13 ATT
→ headphone-amp
14 IN A
→ headphone-amp
15 IN B
16 GND GND
µP → headphone-amp
17 BEEP IN
→ headphone-amp
18 MUTE TC
µP → headphone-amp
19 MUTE SW
→ headphone-amp
20 POWER
headphone-amp →
21 BIAS
→ headphone-amp
22 BIAS IN
µP → headphone-amp
23 DBB SW
headphone-amp →
24 DBB OUT
CS 46 701
3-4
Description
NF of DBB amplifier
output of ADD amplifier
terminal for ripple filter circuit
center amplifier on/off switch (open = on)
positive supply voltage
output of power amplifier
output of center amplifier
output of power amplifier
ground of power amplifier
output of power amplifier (mixed)
input terminal for ALC detector circuit
smoothing for ALC detection (GND = ALC off, open = ALC ON)
power amplifier gain switch (open/VCC = ATT off, GND = ATT on)
input of power amplifier
input of power amplifier
ground of input stage in power amplifier
input terminal for beep sound
terminal for mute smoothing
power mute switch (GND/open = mute off, VCC = mute on)
power switch (VCC = power on, GND/open = power off)
BIAS voltage
filter terminal for BIAS circuit
DBB on/off switch (open/VCC = DBB on, GND = DBB off)
Output of DBB amplifier (terminal for filter)