Sony STR-AV220 Service Manual page 10

| STR-AV220,/AV320
3-8, EXPLANATION OF !IC301 (u4PD75206)
PIN No.} SIGNAL NAME
1 RESET Micro Computer RESET
Vi
OQ
FUNCTION ACTIVE
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FL tube indication Segment/Diode
| 21 [ s8 | FL tube indication Segment/Key Scan
PR Wo.
FL tube indication (invalid) digit | oO |
FL tube indication digit rae. 4
FL tube indication digit T2 es
8 [13 FL tube incision dig ——SC~C~"'"'"*S*~*~SC*C
[6 [te] FL tube indication dit ———SCSC~C~"~*~"~S*dC
FL tube indication digit Tbs|| (Or. 4
SS SS ae FL tube indication digit T6 te
[8 [__t7 | FL tube indication digit ———SCSC~C~S~SSdYCO
FL tube indication digit Ta | Oo |
FL tube SIGNAL indication digit To | oO.
a | oer oeFe Out SSSC~C~ir CO
i 3 _ [ _T1i7PH2 [IF WIDE/NARROW Output ——SCSC~*~rC'i
[a2 7H | adaoter Outeut——SSSSCSC~"'"~*~*~"'"~*~*~dtC
15 | _T137PHO_| ~20d8 Muting Outpt ——SSSCSC~C~S~S~S~SSCi
i 6 _ [ Tia7St1_[ FL tube indication Segment/Dide Si | 0]
7 | Ti87S10 | FL tube indieation Segment/Diode——~—=S10_ ||
18 | _V road | FL tube pulldown power supply S|
| FL tube driver power supply |
Sg om
8
m)1n N | ©
FL tube indication Segment'Key Scan
io) ©)
| 19 | Vpre | FL tube driver power supply
FL tube indication Segment/Key Scan
FL tube indication Segment/Key Scan
FL tube indication Segment/Key Scan
Micro Computer power supply
FL tube indication Segment/Key Scan
| POO/INT4
| O1
19
20
21
23
24
20
26
27
29
30
31
32
O1N NN} @
FL tube indication Segment/Key Scan
"
FL tube indication Segment/Key Scan
FL tube indication Segment/Key Scan
pet: P00,/INT4 Signal to cut power supply STOP
| 32 | PO1/SCK | Serial latch for electrical adjustment use SI. LAT
—Continued on page 22-—
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