6

1. CHECK ON PPI

o CHECK ON CHIP SELECTOR (6 PIN) o CHECK ON RD (5 PIN), WR (36 PIN)

2. CHECK ON CPU SURROUNDING

o CHECK CLK ABOUT (APPROXIMATELY) 1.8MHz o CHECK ON CIRCUIT OSCILLATION o CHECK ON RESET L -> H

3. CHECK ON ROM, RAM

o CHECK ON CHIP SELECT ROM (20 PIN) RAM (8 PIN) o CHECK ON ACTION o CHECK THE ADDRESS DATA BUS. o CHECK THE I/O POWER OF IC 3, 10, 27, 28, 29

o CHECK CLK (22 PIN) ABOUT (APPROXIMATELY) 1.8MHz o CHECK THE INPUT POWER OF 6, 7, 9, 10 PIN ON PORT B o CHECK BC1 (29 PIN) BC2 (28 PIN) BD1R SIGNAL

BC1 L BC2 -* SIGNAL BD1R-> SIGNAL o CHECK ANALOG (ANALOGUE) OUTPUT POWER CHA (3 PIN) CHB (4 PIN) CHC (38 PIN)

5. CHECK THE FILTER

o HOW ABOUT THE JOINING CONDITION TO CAPACITOR

RESISTANCE? o IS FILTER CONTROL OK? IC 18, 19, 20

6. CHECK THE ACTION TO LM741

7. CHECK M51516L

o HOW ABOUT THE JOINING CONDITION TO CAPACITOR

RESISTANCE? o CHECK THE ACTION OF 3 PIN (USUALLY HIGH) IS OUTPUT POWER OK? 8, 9 PIN

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