Chassis: RB2G, HE-L
Chassis: RB2G, HE-L
61
2.3-5 - NO SOUND: MAIN BOARD POWER OFF CHECKING (MAIN SPEAKER L & R) FOR BAX-L (HEL, HEH, HM) BOARD ONLY
RB2G
CHASSIS
W700B/ W800B
Troubleshooting
2-3 No Sound
2-3-6. Main Board Power Off Checking (for Main SP Lch & Rch) for BAX-L (HEL,HEH,HM) board only
2-3. No Sound
No
Checking Item
OK
NG
If
NG
If
NG
1
Check
IC4601 side-terminal of
L4601,L4602,
L4603,L4604
Switching Freq = 384kHz or
768KHz ±20KHz
Vrms = don’t care
No switching
frequency at
either one of
the CL
Go to next checking.
2
Check F4601 MainSP
(for BAX-L only)
V(before fuse) = 12.5V ± 0.5V
V(after fuse) = 12.5V ± 0.5 V
No voltage.
Check fuse broken?
Check CN9101 Pin 8
&10
t 12 5V?
Change fuse (5A).
Check power supply
b
d
di VCC
&10 got 12.5V?
board audio VCC.
3
Check F4601 MainSP
V(before fuse) = 19 5V ± 0 5V
No voltage
Change fuse (5A)
3
Check F4601 MainSP
(BAX-L board only)
V(before fuse) = 19.5V ± 0.5V
V(after fuse) = 19.5V ± 0.5V
No voltage.
Change fuse (5A).
Check power supply
board audio VCC.
4
Check IC4601 (Pin
8) and C4601 (Pin 27)
(for BAX-L board only)
V(before fuse) = 3.3V ± 0.5V
V(after fuse) = 3.3V ± 0.5V
No voltage.
Check +3.3V_MAIN
supply.
