C.2
TP0332/2
Earpiece
Impedance
16
Ω
±2
Ω
.
Power rating
3mW continuous per earpiece, 10mW maximum.
Environmental
Operating temperature range
–10°C to +55°C.
Storage temperature range
–40°C to +80°C.
Figure C.2 Headset Circuit Diagram
OPERATION
Ancillary Type
R28 defines the ancillary as a Headset.
Microphone
The microphone connects to the radio via the tip of the 2,5mm stereo jack (J1) and is powered via
the ring and sleeve of the 3,5mm stereo jack (J2) on the cord assembly.
When the Headset is connected to the radio, the radio’s microphone is switched out of circuit.
Operation of the PTT switch brings into circuit the electret microphone, which is powered from a
rectified and filtered DC supply from the radio. R7 is used to generate a PTT interrupt to the radio.
Speech is superimposed onto this voltage on using the microphone with the PTT switch pressed.
Earpiece
The earpiece connects to the radio via the ring and sleeve of the 2,5mm stereo jack (J1) on the cord
assembly.
When the Headset is connected to the radio, receive audio is routed to the ancillary earpiece and
not the radio loudspeaker.
PARTS LIST
Description
Part No.
Remarks
Headset, complete
0000 242 10002
Earpiece
Mi
c
2,5mm
R6 150R
D1
BAV99
Stereo
Plug
Tip
Ri
n
g
S
leav
e
R6
150R
R7
2k4
C12
1n
C13
1n
22µ
C14
SW1b
R28
24k
C16
1n
SW2
PTT
C11
3µ3
C10
1n
IC1
8
1
NJM2072D
C9
1n
C7
1n
C5
1n
C8
100p
R5 5k6
C6
0µ1
VR
5k6
R4
3k9
VOX
Adjust
C4
1n
R3
100
C3
0µ1
R1
100
C2
1n
C1
1n
WM
-55A
103
1n
SW1 Manual/VOX
PTT Switch
SW 1a
R10 2k2
R2
22R
R14
2k2
R15
100R
Q2
2SC1815Y
C18
0µ1
C20
1n
C19
100µ
C21
1n
R12
33k
R13
6k8
C15
1n
R11
27k
C17
1µ
3,5mm
Stereo
Plug
Tip
Ri
ng
Sl
e
a
v
e
Summary of Contents for SRP8000 SERIES
Page 1: ...SERVICE MANUAL TP0332 2 SRP8000 SERIES VHF UHF PORTABLE RADIO...
Page 55: ...TP0332 2 6 5 Figure 6 4 Radio PCB Component Layout Diagram Side 2 MAIN ASSEMBLY SIDE 2 BOTTOM...
Page 57: ...TP0332 2 6 7 Figure 6 6 Radio PCB Circuit Diagram...
Page 58: ...6 8 TP0332 2 Figure 6 7 Power Supplies Circuit Diagram...
Page 59: ...TP0332 2 6 9 Figure 6 8 Receiver Circuit Diagram...
Page 61: ...TP0332 2 6 11 Figure 6 10 Frequency Generation Circuit Diagram...
Page 62: ...6 12 TP0332 2 Figure 6 11 Baseband Circuit Diagram...
Page 63: ...TP0332 2 6 13 Figure 6 12 Control Circuit Diagram...
Page 64: ...6 14 TP0332 2 Figure 6 13 SMART Interface Circuit Diagram...
Page 67: ...TP0332 2 6 17 Figure 6 16 MMI PCB Circuit Diagram...
Page 75: ...TP0332 2 B 3 PARTS LIST Description Part No Remarks Lapel LS Mic complete 0000 242 10001...