GE Medical Systems Corometrics 340, Service Manual, Page: 57 / 82

Revision A Model 340 Telemetry System 5-5
2006920-001
Calibration: Receiver Calibration
Power Supply
When checking the power supply voltages in this section, ensure all
voltage checks are within their allowable limits at both low and high AC
line voltages.
1. Refer to Table 5-1 and confirm the power supply voltages at the
indicated test points.
2. Confirm the voltage at TP27 is +12 ± 0.6 Vdc with the RF module
connected to J6.
3. Remove the four screws retaining the RF module. Unplug the
connector P6. Do not disconnect the antenna wire. Lay the module
outside the receiver chassis. This will allow access to all the
Telemetry Receiver Board test points and adjustments.
Ultrasound Channel
1. Connect the signal generator between J6 (2) and J6 (Gnd). Adjust the
signal generator for a signal level of 1.0Vp-p at TP45.
2. Confirm the –3 dB points of the band-pass frequency are at least 200
Hz and 400Hz from the input at TP45 to the output at TP14. Set R33
for a gain of 2 at the center of band-pass frequency.
DC
VOLTS
Table 5-1. Power Supply Voltages
Test Point Power Supply Voltage
TP23 +15 ± 0.6 Vdc
TP25 –15 ± 0.6 Vdc
TP26 +5 ± 0.3 Vdc
TP24 –5 ± 0.3 Vdc
dB
UNITS
AC
VOLTS
888 888 888
Hz Generator