184
UF-5500 / 4500
3. DEV DC
DEV BIAS
Check the connection between
Main Board (Pin5 of CN505)
and HVPS unit (Pin5), and
check the Main Board itself.
Is CHG REM signal (Pin5)
at a low level?
Does the DEV CLK
signal (Pin4) turn ON/OFF
at 5.425kHz?
Is the abnormal
detection signal (Pin2) 0V?
Is about 34kHz sine
wave observed at
the collector of Q3?
Check the connection between
Main Board (Pin4 of CN505)
and HVPS unit (Pin4), and
check the Main Board itself.
Check if CHG is no-load
or short-circuited.
Replace the Q3, and check
the peripheral parts.
NO
YES
YES
YES
YES
NO
NO
Does pin1 of IC1
output signal?
Replace the IC1, and
check the peripheral parts.
YES
NO
NO
Replace the Unit.
Summary of Contents for UF-5500
Page 180: ...180 UF 5500 4500...
Page 248: ...248 UF 5500 4500 13 5 Test Chart 13 5 1 ITU T No 1 Test Chart...
Page 249: ...249 UF 5500 4500 13 5 2 ITU T No 2 Test Chart...
Page 281: ...281 UF 5500 4500 10 10 11 15 12 17 18 19 20 21 22 23 24 28 29 30 27 25 26 21 13 14 16 30...
Page 287: ...287 UF 5500 4500 130 131 132 133 134 135 136 137 138 139 140 141 PCB2 A UF 5500 only CN1...
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Page 311: ...311 UF 5500 4500 501 502 503 504 506 507 505 508 509 511 510 514 513 512 P51 P53 P54 A51 P52...
Page 362: ...362 UF 5500 4500...