HP PageWriter XL M1705B Service Manual page 146

Note ,I
w
The battery voltage can be read on the keyboard display using the
following sequence, starting from Standby:
a. Press the (On-Standby) key (to turn on the cardiograph).
b. Immediately press and hold the @ key.
c. Press the 0 key (for "Voltage").
d. Release the (Alt) and Q keys simultaneously.
The battery voltage will be displayed briefly in the center of the
keyboard display. The battery voltage should be slightly higher when
the cardiograph is operating on AC (AC LED is on), indicating that
the battery is charging.
6. Install the battery and turn off the AC switch.
7. Measure VBAT+ again. If the battery is fully charged, the
voltage should measure 19 to 20 volts.
8. Press the (sj switch to turn the cardiograph On.
9. Measure +5V. It should read +5 V DC. Its presence confirms the
proper operation of the +5 volt supply.
10. Measure WE at pin 5 of the ECG Input connector, J9. It should
read approximately 11 volts. Its presence confirms the proper
operation of the WE regulator circuit that supplies power to the
patient module.
11. Measure VPRINT. It should read approximately the same as
VBAT+. Its presence confirms the proper operation of the
printer switch circuit.
12. Measure VMOTOR. It should measure 15.6 to 17.9 V DC. Its
presence confirms the proper operation of the regulator that
supplies power to the motor.
13. Carefully measure VIN ( see the CAUTION at step 3). VIN
should read approximately one volt less than VBATt. Its
presence confirms the proper operation of the battery switch
circuit.
14. Turn on the AC switch.
15. Measure VBAT+. It should read between 19 and 22 volts for a
fully charged battery.
16. Carefully measure VIN again. It should read between 17 and 31
V DC. This confirms the operation of the mains transformer and
the rectifier assembly under full load.
17. Close the top cover a.ssembly.
Troubleshooting 6-23