Tektronix 2230 Service Manual

Maintenance—2230 Service
Table 6-13
PU TEST Failure Codes
Failed
Part
U4113 and U4119 Code
Crt Failure Code
Pins
Pins
Pins
Pins
In Binary
12
13
14 15
(from pu q)
19
18 17
16
ROM
U9109 (E0000)
0
0
1 0
xxxx xxxx xxxx xxxl
U9110 (E8000)
0
1 0
0
xxxx xxxx xxxx xxlx
RAM
U9203
0
1
0
1
xxxx xxxx xxxx xlxx
U9202
0 1
1
0
xxxx xxxx xxxx Ixxx
U9233
0
1 1
1
xxxx xxxx xxxl xxxx
U9232 1
0 0
0
xxxx xxxx xxlx xxxx
U9201
1
0 0
1
xxxx xxxx xl xx xxxx
U9231
1
0
1 0 xxxx xxxx Ixxx xxxx
NMi
1
0
1
1
xxxx xxxl xxxx xxxx
For example, if the calculated value is A4D2 and the
value stored in the ROM is 23DA the following error mes
sage is displayed on the crt:
SYS_ROM_1 : A4D2 < > 23DA
SYS_RAM. This test checks the system RAM. The test
writes a 0xAA55 into 100 bytes of display memory. It then
checks the data to make sure that the data has not
changed. The test is then repeated using 0x55AA.
NOTE
Firmware version 01 only displays the address of the
bad RAM.
If an error is found, the address (greater than 0 but less
than 8000) of the error, the actual data found at the
address, and the data that was expected at that address
are displayed on the crt:
SYS_RAM : @ <address> <actual data> < >
<expected data>
For example, if the address of the bad cell is 0x4000,
the data found at that address is OxOF, and the expected
data for that address is 0x4F the following error message
is displayed on the crt:
SYS_RAM : @ 4000 OF < > 4F
NIB_RAM. This test checks the nibble RAM. The test
procedure and the error message format are the same as
for SYS_RAM.
ACQ_AB. This test checks the address bus of the
acquisition memory. Twenty one unique patterns are
written into the address counters (U3423 U3424 and
U3425) and read back through the acquisition address
buffers (U3427 U3428).
NOTE
At power-up this test and all others are transient
and not active at the time of the power-up failure
messages.
Push the SELECT C1/C2 switch to stop pattern
changes. The test loops using the pattern for the first
error found. All patterns used are shown in Table 6-14.
If an error is found, the value read back and the value
expected are displayed on the crt:
ACQ_AB : read-back <actual> < > <expected>
6-22

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English