LG KG110 Service Manual page 60

C290 1u R275
SPK_P
C291 1u R276
SPK_N
AMP_SHDN
AMP_SHDM
Последовательность проверки
çÄóÄãé
Sine wave apprae at R114, R115?
ë˄̇Π̇ SPK_RCV_SEL ÌËÁÍËÈ?
Ç ÔÓfl‰ÍÂ
ÎË ÒÓ‰ËÌÂÌË ÏÂʉÛ
ÍÓÌÚ‡ÍÚÌ˚ÏË ÔÎÓ˘‡‰Í‡ÏË Ë
‰Ë̇ÏËÍÓÏ?
ÑË̇ÏËÍ ‰ÓÎÊÂÌ ‡·ÓÚ‡Ú¸ ÌÓχθÌÓ
VBAT
C280
1u
U202
MAX9718
0 4 10
IN+ OUT+
0 2 6
IN- OUT-
1 5
SHDN BIAS
3 8
SHDM NC
C277
0.1u
R283 NA
R284 NA
ìÒÚ‡ÌÓ‚ËÚ ÚÂÒÚÓ‚Ó ӷÓÛ‰Ó‚‡ÌË ‚ ÂÊËÏ PRBS
ËÎË ÌÂÁ‡ÚÛı‡˛˘Ëı ÍÓη‡ÌËÈ, ÓÚÍβ˜ËÚ ˝ıÓ,
ÛÒÚ‡ÌÓ‚ËÚ Á‚ÛÍ Ì‡ χÍÒËÏÛÏ
çÂÚ
çÂÚ
4. Устранение неисправностей
VEXT
AUDIO
C271
1u
U201
MAX4684EBC_T
C4
NO1 IN1
A4
NO2 IN2
C1
RCV_P
NC1 COM1
A1
RCV_N
NC2 COM2
èÂÂÔ‡flÚ¸ R114, R115
çÂÚ
èÂÂÔ‡flÚ¸ R280
èÓ‰ÒÓ‰ËÌËÚ¸ Á‡ÌÓ‚Ó
59
C2
SPK_RCV_SEL
A2
C3 R271 0
SPK_RCV_P
A3 R272 0
SPK_RCV_N
R280 (FOR TUNING NOISE)
10K
èÂÂÁ‡„ÛÁËÚ¸ èé