Service manual

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Table 3-11. Main DAC, Transient DAC, Data Bus Signature Analysis (Secondary)
Description: These signatures check main DAC U320, transient DAC U321, and secondary data bus B latches U319. The
signatures are valid for U301 firmware revisions "Rev A.02.01". Use the test setup described in "Test Setup for S.A.".
Signatures:
U319 U320 U321
U319-20 = +5V U320-20 = +15V U321-20 = +15V
Common U319-10 U320-1,3,10,12,18 U321-1,3,10,12,18
SPCLR
U319-1 = +5V
SD(0) U319-7 = UFOA
SD(l) U319-13 = AP48
SD(2) U319-14 = U93A
SD(3) U319-8 = P070
SD(4) U319-4 = 834A
SD(5) U319-3 = 8A16
SD(6) U319-18 = IUUO
SD(7) U319-17 = H083
SDB(0) U319-6 = F592 U320-7 = F592 U321-7 = F592
SDB(l) U319-12 = F3P2 U320-6 = F3P2 U321-6 = F3P2
SDB(2) U319-15 = 4461 U320-5 = 4461 U321-5 = 4461
SD8(3) U319-9 = 5UA2 U320-4 = 5UA2 U321-4 = 5UA2
SDB(4) U319-5 = 63AU U320-16 = 63AU U321-16 = 63AU
SDB(5) U319-2 = 17C1 U320-15 = 17C1 U321-15 = 17C1
SDB(6) U319-19 = 6A0C U320-14 = 6A0C U321-14 = 6A0C
SDB(7) U319-16 = P635 U320-13 = P635 U321-13 = P635
CLK U319-11 = 4OH3
WR1 U320-2 = 57A2
WR1 U321-2 = 1UPU
XBFER U320-17 = 41AH U321-17 = 41AH
B1/B2 U320-19 = 0620