May 28, 2008
6871620L01-C
7-8
Troubleshooting Tables:
List of Board and IC Signals
Table 7-6. U1409 SRAM Pinouts
U1409
Pin No.
Description
To/From
Comment
Accessible
on
Mainboard?
A1
EN_BLE
No
A2
EN_OE
No
B2
EN_BHE
No
B5
EN_CE
No
G5
EN_WE
No
A6
CE2
R1422
1.875V
Yes
A3
Address 0
E1130
Yes
A4
Address 1
E1126
Yes
A5
Address 2
No
B3
Address 3
No
B4
Address 4
No
C3
Address 5
No
C4
Address 6
No
D4
Address 7
No
H2
Address 8
No
H3
Address 9
No
H4
Address 10
No
H5
Address 11
No
G3
Address 12
No
G4
Address 13
No
F3
Address 14
No
F4
Address 15
No
E4
Address 16
No
D3
Address 17
No
H1
Address 18
R1421
Yes
D1
VSS
GROUND
No
E6
VSSQ
GROUND
No
H6
NC2
R1708
Yes
G2
NC1
R1438
Yes
E3
DNU
R9990
Yes
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......