SERVICE MANUAL
5–2
10FEB97 – SM3226-1
Circuit Boards
Driver Board - Versions 1, 2, & 3 and Serial No. Range 500025-500389
DC/DC Converter Output Voltage
Use this procedure to correct timing malfunctions and to restore dropped pixels on film. If the output voltage is less
than -2 Vdc, the PORTABLE COMPUTER displays the “no beam detected error”.
Caution
Close the MAGAZINE WINDOWS or remove the
MAGAZINES before doing this adjustment.
To Check:
[1] De-energize the LASER PRINTER.
[2] Remove the BACK IMAGE UNIT COVER. If
necessary, see the procedure on Page 2–3.
[3] Open the SEQUENCE BOARD SHIELD.
[4] Connect the DIGITAL MULTIMETER TL-3386:
(a) + side to CPM5 on the DRIVER BOARD
(b) COM side to CPG5 on the DRIVER
BOARD.
[5] Energize the LASER PRINTER.
[6] Check that the voltage is -5.2
±
0.05 Vdc.
To Adjust::
[7] Rotate VR5 until the voltage is correct.
[8] Close the SEQUENCE BOARD SHIELD
COVER.
[9] Replace the BACK IMAGE UNIT COVER.
H129_0601AC
SHIELD
BOARD
SEQUENCE
H129_0601ACA
