Check/Adjustment Of High-Voltage Transformer - Toshiba 2060 Service Handbook

1.6 Check/Adjustment of High-Voltage Transformer

1.6.1 Check/adjustment of main, transfer, separation charger and developer bias outputs
When the high-voltage transformer is replaced, etc., the checking/adjusting of the main, transfer and
separation charger and developer bias outputs is necessary. These outputs can be checked/adjusted
in the same way.
Code to be used in the test mode "05":
"38": Main charger
"39": Transfer charger
"40": Separation charger
"43": Developer bias (The output check uses code "38")
Notes: 1. Clear the drum counter (mode "08", code "76") to "0" when the drum is replaced with a new one.
2. When carrying out adjustments of the main, transfer and separation charger output, refer to the points
below.
• Adjustment codes "39" and "40" are not used if developer material is inside (Error code "C35").
• Adjustment codes "39" and "40" are used to perform detection of the remaining developer material for
15 sec. (adjustment is impossible during this period).
• The input value can be adjusted after the remaining developer detection is finished.
• If detection has already been performed once, detection of the remaining developer material cannot
be performed unless disconnection and connection of the developer unit connector are done.
3. Use a digital tester with an input impedance of 10MΩ or over.
<Procedure>
(1) Preparation of the process unit
[A] For the main/transfer/separation charger output
• Pull out the process unit consisting of the developer and cleaner units.
Disconnect the developer and cleaner units.
• Remove the upper cover (2 screws) of the developer unit.
Discharge the developer material from the developer unit.
• Connect the cleaner unit with a drum and developer unit. Install the process unit into the copier.
Connect the connector securely to the developer unit.
[B] For the developer bias output
• Set the process unit to the copier.
• Remove the toner cartridge.
(2) Connect a digital tester to the copier as shown:
• (–) COM terminal of the tester to pin "1" (leftmost terminal) of the measuring terminal.
• For the main charger: (+) terminal to the grid voltage measuring hole.
• For the transfer/separation charger: (+) terminal to pin "3" (rightmost terminal) of the measuring
terminal.
• For the developer bias: (+) terminal to the hole of the plate in front of the developer unit.
Dec. 1996 © TOSHIBA CORP. 1 - 27 2060, 2860/70 ADJUSTMENT