Epson SQ-1170 Service Manual page 123

When only the MAIN board is replaced:
[Step4]
Set the jumpers (5 and 6) on the MAIN board according to the settings confirmed in Step
3, and install the main board to HOUSING, LOWER.
When either the printhead or the printer mechanism is replaced:
Set the jumpers (5 and 6) on the MAIN board according to the settings confirmed in Step
3.
Connect a dummy resistor (20. OKohm~ 1 %) (#F59 1) to connector CN 16 on the MAIN board.
[Step5]
[Step6] Set the digital multi-meter to the test terminal TP3(+) and TP4(–) on the MAIN board.
Connect the control panel to CN 19 and short-circuit the pin no. 1 and no.3 of the connector
[Step7]
Turn on the power.
Adjust the volume VR2 on the MAIN board until the digital multi-meter indicates the specified
voltage with an allowance of &O.5V.
[Step 10] Turn off the power.
Stop short-circuiting CN2 on the control panel, and remove the control panel from the MAIN
[Step 11]
board.
Remove the dummy resistor and the multi-meter from the MAIN board.
[Step 12]
Install the printer mechanism.
[Step 13]
Jumper
Figure 4-7. Jumper Setting
4-7
MAIN Board