Sony KJ-32W7 C Series Service Manual page 58

Troubleshooting
3-3-4. Main Board Power On Checking (for Main SP Lch & Rch) for BAX-L (HEL,HEH,HM,XM-L) board only
No Checking Item
1 Check
IC4601 side-terminal of
L4601,L4602,
L4603,L4604
2 Check F4601 MainSP
(for BAX-L only)
3 Check F4601 MainSP
(BAX-L board only)
4 Check IC4601 (Pin 8) and
C4601 (Pin 27)
(for BAX-L board only)
5 Check CL4605, CL4606,
CL4607
6 Check CL4601, CL4602,
CL4603, CL4604
OK
Switching Freq = 384kHz or
768KHz ±20KHz
Vrms = don't care
V(before fuse) = 12.5V ± 0.5V
V(after fuse) = 12.5V ± 0.5 V
V(before fuse) = 19.5V ± 0.5V
V(after fuse) = 19.5V ± 0.5V
V(before fuse) = 3.3V ± 0.5V
V(after fuse) = 3.3V ± 0.5V
Vdc = 3.3V ± 0.3V
CL4601 = 12.288MHz
CL4603 = 3.072MHz
CL4604 = 48KHz
CL4602 = moving CLK
All Vp-p ≈ 3.3V
If  NG
NG
No switching Go to next checking.
frequency at either
one of the CL
No voltage. Check fuse broken?
Check CN9101 Pin 8 &10
got 12.5V?
No voltage.
No voltage.
Vdc < 0.8V CL4606 NG,
Check IC4601
If no frequency at If sound source OK, but
CL4601, CL4603, CL4602 = NG, Ayu2 IC
CL4604, Ayu2 IC (IC9000) NG.
(IC9000) NG.
If no frequency at
CL4602, make sure
sound source OK.
If  NG
Change fuse (5A).
Check power supply board
audio VCC.
Change fuse (5A).
Check power supply board
audio VCC.
Check +3.3V_MAIN
supply.
CL4605,4607 NG, Check
IC9000
Note:
(AYU2/Ayu2L) – IC9000
(Brownie)- IC9001
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