Battery Charge Voltage; Precautions And Requirements; Tools And Equipment; Procedure - Schiller AT-2plus Manual

Chapter 5
Adjustments

Battery Charge Voltage

Precautions and Requirements

The unit must be placed on an antistatic mat and antistatic precautions observed when any
maintenance is carried out on the AT-2plus. The room temperature should be between 18 and 28
degrees.

Tools and Equipment

• Digital voltmeter
• Small flat bladed screwdriver
• Resistor 2.7kOhms, 250mW

Procedure

The battery charge voltage is nominally 13.5V. Adjust and check as follows:
• DISCONNECT THE MAINS SUPPLY
THE AT-2PLUS CONTAINS STATIC SENSITIVE CMOS COMPONENTS; OBSERVE
ANTISTATIC PRECAUTIONS . PLACE THE UNIT ON AN EARTHED ANTISTATIC MAT.
PERSONNEL MUST BE EARTHED WHEN HANDLING THE UNIT.
EXERCISE CARE WHEN REMOVING AND REPLACING CONNECTORS. NEVER USE
FORCE. NEVER STRAIN THE CABLE ASSEMBLIES.
• Disassemble the unit as detailed in Chapter 4 and remove Printer and printer tray assembly.
• Remove the Main board MK 14 - 10 from the assembly and remove the EMC shield from
the board
• Replace the board in position
• Remove the two battery connectors (if not already removed) and connect a 2.7 kOhm
250mW resistor across the two battery connectors on the main board to simulate a
discharged battery. Connect the digital multimeter across the resistor.
• Connect the Mains supply.
EXERCISE CARE - BE AWARE THAT POTENTIALLY LETHAL VOLTAGES ARE
PRESENT
• Adjust VR1 to obtain a charging voltage of 13.5V.
• Disconnect the mains supply and reassemble the unit as detailed in Chapter 4.
Page 5.6
SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue d May 2002
CAUTIONS
WARNING