Chapter 4: 23
to either the Telecoil or the Telewand. The Telewand signal is connected to
J4 pin 1. If this is a “Remote Chamber Module”, then the Telecoil signal is
connected to J3 pin 4. Q2 buffers the SPK_A/B signal from U1-A on page 1.
The COIL_A/B and LOOP/WAND signals that control U3-A and U2-A and
U4-A come from U1-A on page 1.
Page 4: If this is an 8120 or an 8050, then the SPK_OUT is sent to J10 pin 1, and
the Telecoil signal to J10 pin 4.
RETURNING CURRENT:
Page 2: If this is a “Remote Chamber Module”, then the speaker return current ar-
rives at J3 pin 3 and is named SPK_RET. It is then routed to the same chan-
nel that the outgoing signal came from (SRET_A or SRET_B) by K1. The
telewand current arrives at J3 pin 5 or J4 pin 2 and is named TCOIL_RET.
It is then routed to the same channel that the outgoing signal came from
(SRET_A or SRET_B) by U3-A.
Page 4: If this is an 8120 or an 8050, then the speaker return current arrives at
J10 pin 2 (SPK_RET), and the telecoil return current arrives at J10 pin 3
(TCOIL_RET). See page 2 to see what happens to SPK_RET and TCOIL_
RET next.
Page 1: SRET_A and SRET_B are then sent back to the Connectorboard via J2 pins
3 and 11.
4.4.1.5 Breakout Board Schematic (061-0179-0x)
Page 1:
OUTGOING SIGNAL:
The speaker signal arrives on J1 pin 1 and goes through J3 pin 1 to the speaker. The
telecoil signal arrives on J1 pin 4, is converted to a current by R1, and then con-
nects to J4 pin 1. The telecoil is connected to all 8 pins of both J4 and J5.
RETURNING CURRENT:
The speaker current returns on J3 pin 2 and then heads back to the Chamberboard
on J1 pin 2. The telecoil current returns on J5 pin 8 and then heads back to the
Chamberboard on J1 pin 3.
4.4.1.6 Probeboard schematic(061-0177-0x)
OUTGOING SIGNAL:
Page 1: The signals arrive on J2 pins 10 and 4 and are renamed “SRC_A” and
“SRC_B”.
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