182
UF-5500 / 4500
2. CHG, GRID
Check the connection between Main
Board (Pin5 of CN505) and HVPS unit
(Pin5), and check the Digital unit itself.
NO
YES
YES
YES
NO
NO
Is the abnormal detection
signal (Pin2) 0V?
Does pin1 of IC1
output signal?
Check if CHG is no-load
or short-circuited.
Replace the IC1, and
check the peripheral parts.
YES
NO
Is about 34kHz sine
wave observed at the
collector of Q3?
Replace the Q3, and check
the peripheral parts.
Replace the unit.
Is CHG REM signal
(Pin5) at a low level?
CHG BIAS , GRID
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...