Philips Fm2 Service Manual

Service Menu
Chapter 4 - Power-up Default Settings and the Service Menu
29
System A/D Values
For the end user or service personnel, the system A/D values require no 
interpretation.
The A/D screen displays the current value of each analog-to-digital
(A/D) channel in volts. The A/D channels read DC voltages, for example, power 
supply voltages and battery voltage. The A/D values displayed are static, being 
acquired when the screen is first displayed.
None of the displayed values may be changed or reset...

Service Menu
30Chapter 4 - Power-up Default Settings and the Service Menu 

Chapter 5 - Troubleshooting31
5
Troubleshooting
General
This section provides a guide for qualified service personnel in locating the 
possible cause of an apparent malfunction of the monitor or its accessories. Use 
of built-in diagnostics, flow charts, and step-by-step procedures are provided as 
aids in the troubleshooting process.
The chapter leads you to a probable field replaceable assembly or component. 
Items that are serviceable only at the factory are also identified, as well as 
instructions...

General
32Chapter 5 - Troubleshooting
Initial Trouble Diagnosis
The first step in diagnosing a possible malfunction is to duplicate, if possible, 
the symptoms of the reported malfunction. Thereafter, it is important to 
categorize the problem as either one of two types, as illustrated in Figure 4. They 
are:
 Totally inoperative condition, or
 Degraded operation.
The totally inoperative condition is indicated by the failure of the monitor to 
respond to the power ON front-panel action, or by complete...

Power Problem Diagnosis
Chapter 5 - Troubleshooting
33
Power Problem Diagnosis
Diagnostic Flow Chart
The flow chart of Figure 5 shows a sequence of actions and decisions you can use 
after the initial diagnosis of a “total failure” as a power supply or display 
problem.
Note—If the apparent “total failure” is caused by a malfunctioning display 
backlight, you may see a faintly lit display with the appropriate Power-On 
Self Test message. The troubleshooting under these circumstances is 
described in this...

Power Problem Diagnosis
34Chapter 5 - Troubleshooting
Diagnostic/Repair Actions
Examine
Display
IntenselyReduce background room illumination. If only the back light fluorescent tube 
or its high voltage driver has failed, the display may be faintly visible.
Refer to page 50 for removal procedures.
Replace
BatteryRefer to page 43.
Exchange the
MonitorIf the display is not at all visible, and there is total failure, exchange the monitor.  

Monitoring Degradation Problems
Chapter 5 - Troubleshooting
35
Monitoring Degradation Problems
Diagnostic Flow Chart
Figure 6 illustrates a logical sequence of troubleshooting diagnostics when the 
monitor appears to be operative, but the displayed results are suspect for any 
number of reasons. The resulting diagnosis will result in replacing either the 
monitor or the transducers.
Figure 6 Monitoring Degradation, Diagnostic Flow Chart 

Monitoring Degradation Problems
36Chapter 5 - Troubleshooting
Diagnostic Repair Actions
Describe
Degraded
PerformanceExamine the display after an apparently successful power up sequence and self-
test.
Consider, first, the appearance of artifacts, gaps, or general quality of the display.
Note the values being reported in the numerical frames (FHR(s)) and TOCO). 
Are they clearly unreasonable?
Swap
TransducersUse a spare transducer that is free of defects and meets factory specifications. At 
facilities...

Chapter 6 - Disassembly/Reassembly Guide37
6
 Disassembly/Reassembly Guide
Warning
Performance verification: do not place the monitor into operation after 
repair or maintenance has been performed, until all performance tests and 
safety tests listed in Chapter 8 of this service manual have been performed. 
Failure to perform all tests could result in erroneous monitor readings, or 
patient/operator injury.
Warning
Energized circuits are accessible with the covers open. Do not work on the 
monitor with...

How to Use this Chapter
38Chapter 6 - Disassembly/Reassembly Guide
Caution
Observe ESD (electrostatic discharge) precautions when working within 
the unit.
Caution
Important for disassembly! When disassembling the monitor, make sure 
that the battery leads are disconnected. Otherwise, it is likely that circuit 
damage will occur.
The monitor can be disassembled down to all major component parts, 
including:
PCBs
battery
cables
function buttons
chassis enclosures
Remember to store all screws, nuts,...