Return to Section TOC
Return to Master TOC
TROUBLESHOOTING & REPAIR
PROTECTION BOARD TEST (continued)
FIGURE F.18 - LEADS #309, #309A AT CR1, CR2 RELAYS
CR2 | CR1 |
309A | 309 |
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
7.If the Capacitor Balance Test is OK and more than 5VDC is present at leads #311 to #313 (Step 6), the protection PC board may be faulty.
NOTE: The above voltage checks pertain only to the over voltage signal from the protection PC board to the power PC board. The capaci- tor precharge circuits are also incorporated within the protection PC board. If the problem has not been identified, carefully proceed with the following steps.
8.Remove input power to the Invertec STT machine.
9.Perform the Input Filter Capacitor Discharge Procedure. See the Maintenance section.
WARNING
ELECTRIC SHOCK can kill.
•Before continuing with the test procedure, per- form the capacitor dis- charge procedure to avoid electric shock.
10.Locate and remove leads #309 and #309A from CR1 and CR2 relays. See Figure F.18.
WARNING
ELECTRIC SHOCK can kill.
• With input power ON, there are high voltages inside the machine. Do not reach into the machine or touch any internal part.
11.Apply correct input power and turn ON the machine.
12.Check for approximately 12VDC from plug J15 pin 1 (lead #314)(+) to plug J15 pin 4 (lead#315)
13.Check for approximately 12VDC from plug J15 pin 3 (lead #316)(+) to plug J15 pin 6 (lead#317)
14.If a low voltage is present in either steps 12 or 13 (approximately 1VDC), perform the
Capacitor Balance Test.
15.If the Capacitor Balance Test is OK, the protection PC board may be faulty.
16.Be certain to replace leads #309 and #309A onto the CR1 and CR2 relays.
17.After all tests are completed, install the case wraparound cover.
