Service manual

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Table 3 6. Front Panel Interface Signature Analysis (Primary)
Description
: These signatures check the front panel interface IC's U246 U209, U210 and U212. The signatures are valid for
ROM U205 firmware revision ''Rev A.01.01". Use the test setup described in ''Test Setup for S.A.". Connect the signature
analyzer's CLOCK input to the chip select line of the IC under test as specified below.
Signatures:
U246 Display Driver- connect CLOCK to TP2O1-14 (CS5)
U246-1 = O1UF +5V U246-11 = OOOO pulsing
U246-2 = OO81 U246-12 = OOO8
U246-3 = O1O2 U246-13 = OO1O
U246-4 = OO81 U246-14 = OOO8
U246-5 = OO4O U246-15 = OOO4
U246-6 = OO2O U246-16 = OOO2
U246-7 = OO4O U246-17 = OOO4
U246-8 = OO2O U246-18 = OOO2
U246-9 = OO1O U246-19 = OOO1
U246-10 = OOOO common U246-20 = O1UF +5V
U209, U212 Keypad Drivers - connect CLOCK to TP201-13 (CS4)
U209-1 = O7U3 +5V U209-11 = OOOO pulsing
U209-2 = OO81 U209-12 = O3O6
U209-3 = O1O2 U209-13 = O6OH
U209-4 = O245 U209-14 = OOO8
U209-5 = O122 U209-15 = OOO4
U209-6 = O2OH U209-16 = O2O7
U209-7 = O41A U209-17 = O4O8
U209-8 = O42A U209-18 = O68P
U209-9 = O215 U209-19 = O347
U209-10 = OOOO common U209-20 = O7U3 +5V
U212-1 = OO81 U212-8 = O4OA
U212-2 = O7OH U212-9 = O20H
U212-3 = OOO4 U212-10 = O60U
U212-4 = O7U4 U212-11 = O122
U212-5 = O215 U212-12 = O40A
U212-6 = O4OA U212-13 = O347
U212-7 = OOOO common U212-14 = O7U3 +5V
U210 Keypad Receiver - connect CLOCK to TP201-10 (CS11)
U210-1,19 = OOOO pulsing Lo ( Chip Select )
U210-2,18 = O1UF press keypad " 1 " = O17H
U210-3,17 = O1UF press keypad " 8 " = O17H
U210-4,16 = O1UF
U210-5,15 = O1UF press keypad " 4 " = O17H
U210-6,14 = O1UF press keypad " 9 " = O17H
U210-7,13 = O1UF press keypad " 7 " = O17H
U210-8,12 = O1UF press keypad " 0 '' = O17H
U210-9,11 = O1UF pulsing 9 (fast), 11 (slow)
U210-10 = OOOO common
U210-20= O1UF +5V