Brother T-8421C Instruction Manual page 9

11. CLEANING .........................................
11-1. Daily cleaning procedures ............................ 55
11-2. Lubricating via the oil cover
(every 6 months)........................................... 56
11-3. Applying grease (Semi dry
specifications) [When "GrUP" appears
... When using the G50 operation panel]...... 57
11-4. Applying grease (Semi dry
specifications) [When "GrUP" appears
... When using the G10 operation panel]...... 60
12. ADJUSTING THE ROTARY HOOK
LUBRICATION AMOUNT...................
13. STANDARD ADJUSTMENT...............
13-1. Safety switch position ................................... 64
13-2. Thread take-up amount for thread take-up
spring............................................................ 65
13-3. Thread take-up spring tension...................... 66
13-4. Clearance between rotary hook and needle
plate.............................................................. 67
13-5. Clearance between rotary hook and
opener .......................................................... 68
13-6. Presser foot height ....................................... 68
13-7. Needle and rotary hook timing ..................... 69
13-8. Installing the feed dog .................................. 71
13-9. Feed dog position ......................................... 72
13-10. Feed dog height.......................................... 73
13-11. Feed dog angle........................................... 74
14. TROUBLESHOOTING........................
14-1. Sewing .......................................................... 75
14-2. Error code displays....................................... 80
15. 7-SEGMENT DISPLAY.......................
55
63
64
75
84
T-8421C, 8422C, 8452C, 8722C, 8752C