Sony UP895 Service Manual - Page 43
Troubleshooting, 5-1. Print is Faulty - up 895 troubleshoot
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5-1. Print is Faulty START Section 5 Troubleshooting Is video signal available at TP5 (AD-IN) on MA-99 board? YES Is video signal available at TP6 (AD-IN) on MA-99 board? YES Is video signal output from data bus of IC500 on MA-99 board? YES Is signal available at pin 14 of IC500 on MA-99 board? YES Is test pattern properly printed in test mode? YES Peripheral circuits IC1, IC2 and Q200 on MA-99 board NO are defective. Peripheral circuits IC6, Q6 and Q7 on MA-99 board are NO defective. Peripheral circuit IC500 on MA-99 board is defective. NO Pin 126 of IC501 on MA-99 board is defective. NO IC501 and CN9 on MA-99 board are defective. NO Peripheral circuits IC501 and IC503 on MA-99 board are defective. UP-895/(E) 5-1
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5-1
UP-895/(E)
Section 5
Troubleshooting
5-1.
Print is Faulty
Pin 126 of IC501 on MA-99 board is defective.
Is video signal available at
TP5 (AD-IN) on MA-99 board?
NO
NO
NO
NO
YES
YES
YES
YES
Is video signal available at
TP6 (AD-IN) on MA-99 board?
Is video signal output from data bus
of IC500 on MA-99 board?
Is signal available at
pin 14 of IC500 on MA-99 board?
START
Peripheral circuits IC1, IC2 and Q200 on MA-99 board
are defective.
Peripheral circuits IC6, Q6 and Q7 on MA-99 board are
defective.
Peripheral circuit IC500 on MA-99 board is defective.
IC501 and CN9 on MA-99 board are defective.
NO
YES
Is test pattern properly
printed in test mode?
Peripheral circuits IC501 and IC503 on MA-99 board
are defective.