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 TP201-14 (CS5)
U246-1 = O1UF +5V U246-11 = OOOO pulsing
U246-2 = OO81 U246-12 = OOO8
U246-3 = O1O2 U246-13 = OO1O
U246-4 = OO81 U46-14 = OOO8
U246-5 = OO4O U46-15 = 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
U246-1O = 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 = O64U U209-14 = OOO8
U209-5 = O327 U209-15 = OOO4
U209-6 = O3OU U209-16 = O3O5
U209-7 = O61U U209-17 = O6OC
U209-8 = O225 U209-18 = OO81
U209-9 = O112 U209-19 = OO4O
U209-10 = OOOO common U209-20 = O7U3 +5V
U212-1 = OO81 U212-8 = O4OA
U212-2 = O7OH U212-9 = O3OH
U212-3 = OOO4 U212-10 = O4OA
U212-4 = O7U4 U212-11 = O327
U212-5 = O112 U212-12 = O78F
U212-6 = O6OU U212-13 = OO4O
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