IBM 5150 - Page 150

Error
Description
Diagnostic Action
Power
4.
Position the Printer Power switch to OFF.
~
Supply
Connect CN2 (see Section 5, "Locations").
Check Power on. Measure voltages at CN3 (see
Section 5,
"Locations") as shown in chart
below. Use
the ground pin on Drive Circuit
card.
DANGER: LINE VOLTAGE IS PRESENT
ON THE
AC FILTER,
CIRCUIT BOARD, AND
TRANSFORMER. CAUTION
SHOULD BE EXERCISED
WHEN MEASURING
DC
VOLTAGES.
Min.
Max
,,-...
Pin no. voltage voltage
CN3-16 +4.5 Vdc +5.5 Vdc
CN3-20
+12.6 Vdc
+15.4Vdc
Are +5 and + 14 Vdc within range?
YES: Go to step 5.
NO:
Replace both Control cards (see
Section 3, "Removal/Replacement") .
,,-...,
•
1400-9