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SPP-205/206
5-3.
BLOCK DIAGRAM – BASE UNIT Section (2/2) –
(Page 24)
TX
A
(Page 24)
RX
B
05
4
3
5
IC8 (1/3)
LINE SELECT
SWITCH
(HANDSET)
9
8
6
Q18
LINE SELECT SWITCH
(SPEAKER)
LINE SELECT SWITCH
(INTERCOM)
IC8 (2/3)
10
11
12
Q19
LINE SELECT SWITCH
(SPEAKER)
IC8 (3/3)
2
1
13
LINE SELECT SWITCH
(INTERCOM)
45 46
– 25 –
AF AMP
+
TEL AMP
IC9 (1/2)
Q4
SIDE TONE
CANCEL
AF AMP
IC9 (2/2)
RXI
RXO
RECEIVE
27
26
ATT
SPEAKER
VOLUME
VOICE SPEAKERPHONE
IC11
TXO
TXI
TRANSMIT
4
3
ATT
TX DET
XDI
13
COMPRESSOR
ATT
VLC
24
CONTROL
RLI
7
RX DET
TX/RX DET
COMPRESSOR
TLI
5
TX DET
CS
18
BUFFER
Q17
44
1
16
SYSTEM CONTROLLER
IC14 (2/2)
T2
HYB TRANSFORMER
+
PARA
RINGER
DETECT
DETECT
IC10
IC26, Q25, 26
RL2
RELAY DRIVE
Q14
SKO
SKI
+
SPEAKER
19
15
AMP
VR1
MCO
MIC
MCI
10
9
AMP
MIC
MUTING
Q7
Q20
SPEAKER
MUTING
38 37
14
17
– 26 –
• SIGNAL PATH
J3
: TX
LINE
: RX
: TX (INTERCOM)
: RX (INTERCOM)
: BELL
SP701
(SPEAKER)
MC251
MIC
23 22 39
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