Pioneer VSX-821-K Service Manual page 39

5
C
SDA (ABT)
IC1311 (pin 61)
Check the line and IC1308,
Does a signal output No
RESET (63_H). If IC1311
in constant period
is failure, replace IC1311.
(0 to 3.3 V)?
Yes
SCL (ABT)
IC1311 (pin 62)
Check the line and IC1308,
No
Does a signal output
RESET (63_H). If IC1311
in constant period
is failure, replace IC1311.
(0 to 3.3 V)?
Yes
SDA (DECODER)
IC1302 (pin 53)
Check the line and IC1308,
Does a signal output No
RESET (51_H). If IC1302
in constant period
is failure, replace IC1302.
(0 to 3.3 V)?
Yes
SCL (DECODER)
IC1302 (pin 54)
Check the line and IC1308,
Does a signal output No
RESET (51_H). If IC707 is
in constant period
failure, replace IC1302.
(0 to 3.3 V)?
Yes
To Step 8
5
6
Step 8: ANALOG UP
Are the connectors
securely inserted?
Does a signal output
IC1302 (pins 36, 47, 48, 49, 50)
Does a signal output
Step 9: TMDS
IC1308 (pins 30,31,33,34,36,37,39,40)
Are there signals
(approx. 0.5 Vp-p)
VSX-821-K
6
7
CN1304
No
Turn the power off and insert
the wire securely.
Yes
IC1316 (pin 55)
COMP_DET
No
Check the line and IC1316.
(0 V)
If IC1316 is failure, replace
in constant period
(0 to 3.3 V)? IC1316.
Yes (3.3 V)
Check the line and IC1302.
If IC1302 is failure, replace
No
IC1302.
in constant period
IC1302 (pin 36 (CVBS), 47 (CR),
(WAVE)?
48 (CB), 49 (Y), 50 (SOY))
Yes
To Step 9
TMDS OUTPUT
Check the IC1308 or IC1303.
No
If IC1308 or IC1303 is failure,
replace IC1308 or IC1303.
IN all lines?
Yes
End
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