Toshiba e-STUDIO520 Service Handbook page 435

[CA20] H-sync detection error
(e-STUDIO520/523,e-STUDIO600/603,e-STUDIO720/723)
Is the harness connecting the connector (J207) on the PLG board and the connector on the
LDR1 board open circuited? Are the connectors damaged or disconnected?
Is the harness connecting the connector (CN202) on the PLG board and the connector on
the SNS board open circuited? Are the connectors damaged or disconnected?
(e-STUDIO850/853)
Is the harness connecting the connector (J207) on the PLG board and the connector on the
LDR1 board open circuited? Are the connectors damaged or disconnected?
Is the harness connecting the connector (J208) on the PLG board and the connector on the
LDR1 board open circuited? Are the connectors damaged or disconnected?
Is the harness connecting the connector (J210) on the PLG board and the connector on the
SNS board open circuited? Are the connectors damaged or disconnected?
l NO
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YES
1) Check if the conductor pattern on the PLG board is short circuited or open circuited.
2) Check if the grounding wire of the high-voltage unit (e.g. developer unit, transfer unit) is
grounded securely.
3) Check if the bias contact point of the high-voltage unit is contacted securely. (Check if
the point is not stained either.)
4) Check if the metal plates of the transport system are grounded securely.
5) Check if the equipment is grounded securely?
6) Replace the laser optical unit.
© 2005 - 2007 TOSHIBA TEC CORPORATION All rights reserved
(e-STUDIO520/523,e-STUDIO600/603,e-STUDIO720/723)
1) Replace the harness. Reconnect the connector.
2) Check if the connector(J207) on PLG board hold the harness
securely?
3) Check if the following signals are transmitted on the pin of the con-
nector(CN1) on the PLG board?
Pin 1: 5V, Pin 3: 0V
4) Replace the laser optical unit.
(e-STUDIO850/853)
1) Replace the harness. Reconnect the connector.
2) Check if the connector(J207,J208) on PLG board hold the harness
securely?
3) Replace the laser optical unit.
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e-STUDIO520/523/600/603/720/723/850/853
TROUBLESHOOTING
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