Chapter 9 Modules' Malfunction Verification; Verifying Malfunction Of The Main Control Board - EDAN F9 Service Manual

F9 Fetal & maternal Monitor Service Manual

Chapter 9 Modules' Malfunction Verification

When a module is suspected of malfunction, verify it using the method described in this chapter.
NOTE: For all the interfaces, the first pin is the one with a square solder pad.

9.1 Verifying Malfunction of the Main Control Board

To verify the main control board,
1) Open the main unit using the procedures described in section 10.3.
2) Switch on the monitor. (Powered by AC or battery.)
3) Measure the voltage to earth of the pins listed below, using a multimeter:
J8
○
1
J31
○
2
Item Pin
○
J8's first pin
1
○
J31's first pin
2
○
TP1
3
○
TP2
4
○
C35's positive pole
5
○ C16's positive pole
6
○ J2's first pin
7
○ C59
8
○
C61
9
Main control board
Modules' Malfunction Verification
Reference result
VCC+5V (5.0±5%) V
VCC33（3.3±5%）V
+12V (12.0±5%) V
PVCC（3.3±5%）V
VDDARM (1.9±5%) V
VDDALIVE (1.9±5%) V
VBB33 (3.3±5%) V
VDD_RTC (1.8±5%) V
Li_BAT (≥2.75V)
○
3
- 40 -
TP1 TP2
○
4
○
5
○
6
○
7
C35
C16
J2