IBM 2025 Maintenance Manual page 251

See Figure 6-15
1403 Coil Protect
Check Bypass
.Switch 3
TB25 01 H-A1
Hammer Driver
Board
Hammer Filter
Driver
Fan Unit
HDTB1
Figure 6-14. 1403 controls (Right Side)
6-14 ( 7 /69)
1403 Current
Limit Switch 4
PS14
TB2
PS14-F1