3-4
2. POWER SUPPLY ON I/O BOARD
No 33VT
Is the VCC (33V) sup-
plied to Q161 Emitor?
Check D126 on SMPS
Board and Replace
Is there about 0V
at Q152 Collector?
Check Q161 and
Replace
Check the ‘TIMER H’
signal from µ-COM
Is there about 5V at R180
and 0.7V at Q152 Base?
Check Q152 and
Replace
YES
YES
YES
No 5VT
Check 5.3VA on
SMPS Board
Check Q155 and
Replace
Is the VCC (5.3V) sup-
plied to Q155 Emitor?
Is there about 0V at D152
and Q152 Collector?
Is there about 5V at R180
and 0.7V at Q152 Base?
NO
NO
Check the ‘TIMER H’
signal from µ-COM
NO
YES
YES
YES
Check Q152 and
Replace
YES
No 12V
Check D124 on SMPS
Board and Replace
Check Q164 and
Replace
Check D126 on SMPS
Board and Replace
Check Q162 and
Replace
Check the ‘PWR CTL
H’ signal from µ-COM
Is the VCC (14V) sup-
plied to Q164 Collector?
Is there about 12.5V at
ZD151 & Q164 Base?
Is the VCC (33V) sup-
plied to Q162 Emitor?
NO
NO
NO
NO
NO
YES
YES
YES
Is there about 0V
at Q162 Base?
YES
Is there about 5V at R171
and 0.7V at Q156 Base?
YES
Check Q156 and
Replace
YES
No 5.2V
Check 5.3VA on
SMPS Board
Is the VCC (5.3V) sup-
plied to Q151 Emitor?
Is there about 0V at D153
and Q156 Collector?
NO NO
Check Q151 and
Replace
Check the ‘PWR CTL
H’ signal from µ-COM
NO
NO
NO
NO
YES
YES
Is there about 5V at R171
and 0.7V at Q156 Base?
Check Q156 and
Replace
YES
YES
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