Passport 5-Lead, 5L, LT, XG Service Manual
0070-00-0420
2 - 9
Theory of Operation
Block Diagrams
After the high voltage suppression stage, each ECG leadwire’s signal enters a separate RC
filter to attenuate electro-surgical frequencies, as well as the respiration carrier generated on
the Front End Module. The five RC filters are R11-C6, R6-C9, R8-C7, R5-C10, and R7-C8.
Respiration
Connection to the patient is made by ECGRA, and ECGLA, via J3. High voltage protection,
up to 6000 volts differentially, is provided by capacitors C1 and C2. The patient signal is
finally routed to the Front End Module as RRA and RLA, via J1.
Pressure
This monitor incorporates two invasive pressure transducer channels. Connection to the
patient for the P1 channel is via connector P1, and for the P2 channel, connector P2. Voltage
excitation for the transducers is provided by the +IN and -IN signals which is a 5v supply (-IN
is connected to isolated ground on the Front End Module). Transducer output is carried
differentially on the +OUT and -OUT (P1 and P2) signals to the Front End Module. High
voltage electrostatic discharge protection is provided by suppressors CR8 through C12.
Temperature
Both Series 400 and Series 700 type sensors can be connected to the monitor using the
connector jack J4. The input signals are protected by transient voltage suppressor CR9. EMI
and RFI suppression is provided by common mode choke L1, and C3, C4, and C5. TIP,
RING, and SLEEVE signals are sent to the Front End Module via J1.
Controlled High Voltage Discharge
The Interconnect board provides a specific path to bleed off slowly accumulated static energy
to non isolated monitor ground, through R4, a 100 MW resistor. Rapid accumulation of
charge (voltage) at levels of over approximately 5500 volts, are discharged through DG1, a
gas spark gap device to non isolated monitor ground potential. The connection to the non
isolated monitor ground is via a direct wire strap from the resistor and spark gap
combination non isolated side, to the monitor’s internal center chassis structure.
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