Toshiba e-Studio 350P

Service checks which involve measuring voltages on the LVPS/HVPS (low voltage power supply/ high voltage power supply board) should be performed with the printer positioned on its back side.

Note:
When making voltage readings, always use frame ground unless another ground is specified. See the wiring diagram in the back of the book for more information.

Controller card service check

FRU	Action
Controller card assembly Warning: Do not replace the operator panel and controller card at the same time. Each card contains the printer settings. When either of these cards is new, it obtains some of the settings from the other card. Settings are lost when both are new and replaced at the same time.	POST (Power-On Self Test) Note: The printer should complete POST in approximately 30 seconds. If the printer fails to display lights or activate the drive motor, fuser or fan, check the following order: 1. Power to the LVPS/HVPS 2. Power from the LVPS/HVPS to the controller card 3. Cables are plugged in correctly, especially for the operator panel. The printer will not power-up without a functioning operator panel. 4. The controller card assembly. 5. The operator panel.
	Verify +24 V dc input from the LVPS/HVPS. 1. Turn the printer off. 2. Disconnect the LVPS/HVPS cable from the controller card at J19. 3. Turn the printer on. 4. Verify +24 V dc on positions 8 and 9 of the cable connector. 5. If voltage is correct, check the continuity in the other conductors of the cable. If the cable is good, check the connectors to the controller board. 6. Verify that pins 7 and 12 on both the cable and the card connector are grounded. 7. If grounds are not correct on the cable, but the cable posses continuity otherwise, check the LVPS/HVPS. 8. If the grounds are not correct on the controller card, replace the controller card. (Check with one probe on the connector pin and the other on the card’s ground plane found at each screw head.)
	Controller card voltage outputs Turn the printer off, and plug the LVPS/HVPS cable into J19 of the controller card. See the wiring diagram at the end of the book which identifies the voltages and grounds for a good controller card. Turn the printer off before plugging or unplugging any connectors.
LVPS/HVPS	Verify main power to controller card With the printer off, unplug the LPS/HVPS cable at J19 on the controller card. Verify grounds on pins 7, 12, and 14 for both the cable and the controller card. If any of these grounds are incorrect, check the cable for continuity. Replace the cable or the respective card as necessary. Turn the printer on with the cable still unplugged, and verify the following on the cable (controller card will not be powered): J19-8 +24 V dc J19-9 +24 V dc J19-13 +5 V dc If any of the voltages are incorrect, replace the LVPS/HVPS