Brother HE-800B Service Manual page 144

Error status #7 An error code is displayed during home position detection.
Probable causes
1. If feeding does not occur and error
E210 is displayed, there is a
malfunction of the power PCB.
2. If feeding does not occur and error
E210 is displayed, there is a
malfunction of the main PCB.
3. If feeding occurs slightly and error
E210 is displayed, there is a
malfunction of the encoder.
4. If zigzagging does not occur and
error E210 is displayed, there is a
malfunction of the pulse motor or
cord.
135
Check/ repair/ adjust
Disconnect connectors P1 (POWER2) and P24
(POWER1) from the main PCB, and then turn on
the power switch and check LD1 (red) on the
power PCB.
OK if illuminated.
After checking, turn off the power switch, wait for
one minute or more, and then insert P1 and P24
into the main PCB.
a. Disconnect connector P24 (POWER1) from
the main PCB, and check the continuity
between terminals 1 and 2 of P24.
OK if ∞ ohms.
b. Disconnect connector P22 (YPM) from the
main PCB, and check the continuity between
terminals 1 and 2, 3 and 4 of P22.
OK if ∞ ohms.
c. Insert P22 and P24 into the main PCB, turn on
the power switch and then check LD1 (red) on
the power PCB.
OK if illuminated.
If LD1 is illuminated during the check in step 1
but it does not illuminate when P1 and P24
are connected, there is a malfunction of the
main PCB.
d. Check LD1 (orange) on the main PCB.
OK if illuminated.
2717B
2720B
a. Check that connector P18 (Y-ENC) is inserted
into the main PCB and that the color matches.
b. Check the encoder input while referring to
"3-7. Input checking method".
a. Disconnect the main PCB connector P22
(YPM) and measure the resistance between
pins 1-2 and 3-4 of the cord connector.
OK if 2-3 ohms.
b. If step a. (above) is OK, there is a malfunction
of the main PCB.
2721B
HE-800B
9. ELECTRIC MECHANISM
Parts to be replaced
Power PCB assembly
Main PCB assembly 800B
Pulse motor feed assembly
Main PCB assembly 800B
Pulse motor feed assembly
Main PCB assembly 800B