4-4. ALC is not supplied.
1. If +5V is not supplied, the ALC is not supplied.
2. If +12V is not supplied, the ALC detecting IC5 does not oper-
ate.
1. R30, 31, 32 trouble may be the cause.
2. The Ac input voltage fall may be the cause.
1. IC5 trouble may be the cause.
4-5. PHSNS signal is not supplied.
1. If +5V and +12V are not supplied, PHSNS signal is not sup-
plied.
1. R3, 4, 18, 19 or PC2 open may be the cause.
2. D7 short may be the cause.
1. Q4 short may be the cause.
NO
YES
NO
YES
START
OK
YES
NO
Are +5V and +12V
supplied normally ?
Is the voltage
across C26 13V
or more ?
Is ALC of about 5V
supplied ?
Repair
Repair
Repair
NO
YES
NO
YES
START
OK
YES
NO
Are +5V and +12V
supplied normally ?
Is the voltage
across C26 13V
or more ?
Is ALC of about 5V
supplied ?
Repair
Repair
Repair
6 – 6
Summary of Contents for UP-5700
Page 139: ...1 UP 5700 Main PWB CHAPTER 10 PWB LAYOUT A side 10 1 ...
Page 140: ...2 UP 5700 CPU PWB A side UP 5700 CPU PWB B side 10 2 ...
Page 141: ...3 UP 5700 KEY I F PWB A side CN2 UP 5700 KEY I F PWB B side 10 3 ...
Page 144: ...For components produced in January 1998 and onward Parts side Solder side 10 6 ...
Page 145: ...7 2 Sub PWB Side A Side B 10 7 ...