22 Maintenance Manual
and R72 which are then amplified and named ADC12 and ADC13. The
return currents finally arrive at system Mecca J9.
Page 6: ADC12 and ADC13 arrive at U1 pins 9 and 10.
4.4.1.3 Connectorboard schematic (061-x172-0x)
OUTGOING SIGNAL:
Page 3: SOURCE_A and SOURCE_B arrive on pins 6 and 7 of J5. The SPI Buss from
the Daughterboard arrives on J5 pins 15, 16, and 17 (SPIMOSI, SPICLK,
SPICSL).
Page 1: SOURCE_A and SOURCE_B are then sent to U15-A and U16-A which are
Digital Potentiometers. U15-A and U16-A are used to attenuate the source
as needed before sending them on to the Speaker amplifiers U4-A and
U5-A. Relays K1 and K2 are then used to direct the two speaker signals to
either Module 1 or Module 2. Note the signals are now renamed “SRC_1A”,
“SRC_2A”, “SRC_1B” and “SRC_2B”. These four names indicate which
channel they are (“A” or “B”), and which module (“1” or “2”) they are being
sent to. The SPI Buss from page 3 goes to U3, U15-A and U16-B. U3 is a se-
rial to parallel output shift register that is used to control the Speaker amps
Mute and Standby, and the relays on this page. U15-B and U16-B is the SPI
interface part of the Digital Potentiometers.
Page 3: SRC_1A and SRC_1B are connected to J3 (Module 1) pins 10 and 4.
SRC_2A and SRC_2B are connected to J4 (Module 2) pins 10 and 4. They
are then sent to the chamber module via the FPI cables.
RETURNING CURRENT:
Page 3: The source return currents arrive back from the remote modules on J3 and
J4 pins 3 and 11. They are named SRETA and SRETB and then sent to the
Daughterboard via J5 pins 5 and 8.
4.4.1.4 Chamberboard schematic (061-x178-0x)
OUTGOING SIGNAL:
Page 1: The signals arrive on J2 pins 10 and 4 and are renamed “SRC_A” and
“SRC_B”. The Source control signals SPK_A/B, COIL_A/B and LOOP/
WAND originate on U1-A pins 43, 44 and 51.
Page 2: SRC_A and SRC_B are then connected to K1, which is used to direct one of
them to the chamber speaker. The signal is then renamed “SPK_OUT”. If
this is a “Remote Chamber Module”, then the speaker signal is connected
to J3 pin 2. SRC_A and SRC_B are also connected to U2-A which is used to
direct one of them toward the “Coil”. U4-A is used to direct that Coil signal
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