Pioneer VSX-821-K Service Manual page 29

5
Step 3: Power supply
IC1305 (pin 2)
Is the voltage of 12 V input?
Yes
IC1305 (pins 7,8)
Is the voltage 3.3 V output?
Yes
REG1302 (pin 2)
Is the voltage of 1.2 V output?
Yes
Check the IC1324 DSP power pin (cvdd &
dvdd): cvdd : 1.2 V, dvdd : 3.3 V
OK
+3.3V line of D-MAIN Assy is OK
Step 4: Power supply
CP1304 (pins 1, 2)
Is the voltage 12 V?
Yes
IC1325 (pin 2)
Is the voltage of 12 V input?
Yes
IC1325 (pins 7, 8)
Is the voltage 5 V output?
Yes
Check the IC1318 power pin
(dvdd, avdd, PVDD)
: dvdd: 5 V, avdd: 5 V, PVDD: 5 V
OK
HDMI+5V line is OK
5
6
12 V input
No
Check the IC1305 and its
peripheral circuits.
No
Is pin 6 (en) of IC1305 high?
Yes
(to chassis)
Check the IC1324 DSP power pin
No
(cvdd & dvdd) and its peripheral
circuits or must be replaced
IC1324, REG1302.
12 V input
No
Check the wire between
D-MAIN and MAIN Assys.
12 V input
No
Check the IC1325 and its
peripheral circuits.
No
Is pin 6 (en) of IC1325 high?
Yes
6
7
OK
Replace IC1305 or
Check the MAIN Assy.
No
Check the peripheral circuits
or the SUB CPU (IC1316).
IC1300 (pin 2)
Is the voltage of 1.2 V output?
Yes
Check the IC1303 HDMI power pin (avcc12)
: avcc : 1.2 V
OK
+3.3V line of D-MAIN Assy is OK
OK
Check the MAIN Assy.
NG
Replace IC1325.
No Check the peripheral circuits or
the SUB CPU (IC1316).
VSX-821-K
7
8
OK
Replace IC1305.
(to chassis)
No
Check the IC1303 HDMI POWER
pin (avcc33, avcc12) and its
peripheral circuits or must be
replaced IC1303, IC1300.
OK
Replace IC1305.
8
A
B
C
D
E
F
29