Service manual

91
Description
: These signatures check the fan speed control circuits. Connect the signature analyzer's clock input to the
IC under test as specified below.
Signatures:
U227- connect CLOCK to TP201-15 (CS6)
U227-1 = O1UF +5V U227-11 = OOOO Pulse LO
U227-2 = OO81 U227-12 = OOO8
U227-3 = O102 U227-13 = OO10
U227-4 = OO81 U227-14 = OOO8
U227-5 = OO40 U227-15 = OOO4
U227-6 = OO20 U227-16 = OOO2
U227-7 = OO40 U227-17 = OOO4
U227-8 = OO20 U227-18 = OOO2
U227-9 = OO10 U227-19 = OOO1
U227-10 = OOOO com U227-20 = O1UF +5V
U233, U241, 242, 245 - connect CLOCK to U207-9 (E clock)
U241-1 = 437U +5V U242-1 = 437U +5V
U241-2 = 90F3 U242-2 = OOOO
U233-1 = 2171
U233-2 = 2171
U233-3 = OOOO Pulsing LO
U233-4 = 762C
U233-5 = 762C
U233-6 = OOOO Pulsing LO
U233-7 = OOOO com
U245-1 = 1233 U245-8 = OOOO
U245-2 = OOOO U245-9 = 1687
U245-3 = 85F9 U245-10 = OOOO
U245-4 = OOOO U245-11 = 5255
U245-5 = U28H U245-12 = OOOO Pulsing
U245-6 = OOOO U245-13 = 899A
U245-7 = OOOO com U245-14 = 437U + 5V