Display Service Procedure - Pacific Power Source MS SERIES Operation Manual

SECTION 6

6.3.3 DISPLAY SERVICE PROCEDURE

The troubleshooting procedure contained in this paragraph is to be used to locate
a problem within the Display Circuits of the MS power source. Directions are
given which locate a fault to the PCB level or component level as appropriate.
Do not use this procedure unless instructed to do so by the performance check
flow chart.
The numbered comments below correspond to the circled numbers on figure
6.3.3 and provide detailed instructions relative to the referenced step.
1. Reset the Display PCB by simultaneously pressing INPUT, OUTPUT and
HELP keys. If this does not cause a reset remove input power from the
machine and reapply input power. If this does not reset the Display PCB,
replace the Display PCB.
2. Pressing the DIAG KEY then f3 KEYS shall cause the LCD to display
INTERNAL VOLTAGES. Ignore BUS voltages at this time. The LVPS
shall be between 15 and 20 VDC. If the LVPS was outside of this range it
would cause an EMER OFF. If the display is not correct replace the
Display PCB.
3. Pressing the INPUT key should cause the LCD to display input power. If
the input voltages are not within 3% of the displayed voltages, replace the
Discharge PCB.
Pacific Power Source ©2013 6-24
SERVICE
Document # 126050-10 Rev E