HI,ALL
I just entered the EEV forum, and this is my first time posting

I have a TDS7104 scope that was working properly and passing its self-test and SPC at the time it was stored away.But today it can not pass SPC

I read the startup information through the RS232 port of the PPC board and obtained the following code:
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
romPost: MPC106 Walking-one passed.
romPost: MPC106 configuration passed.
romPost: First PCI access passed.
romPost: PC87560 Walking-one passed.
romPost: PC87560 configuration passed.
romPost: DEC21554 configuration passed.
romPost: PERFORMING ROM CHECKSUM TEST...
romPost: ROM checksum passed.
romPost: PERFORMING DRAM CELL TEST...
romPost: Enabling data cache...
romPost: Data cache enabled.
romPost: Enabling instruction cache...
romPost: Instruction cache enabled.
romPost: DRAM Cell test passed.
romPost: Disabling data Cache...
romPost: Data cache disabled.
romPost: Disabling instruction cache...
romPost: Instruction cache disabled.
romPost: PERFORMING DRAM MARCH TEST WITH CACHE OFF...
romPost: Writing address to each *address...
romPost: Reading address from each *address...
romPost: DRAM march test passed...
romPost: PERFORMING DRAM MARCH TEST WITH CACHE ON...
romPost: Enabling data cache...
romPost: Data cache enabled.
romPost: Enabling instruction cache...
romPost: Instruction cache enabled.
romPost: Writing address to each *address...
romPost: Reading address from each *address...
romPost: DRAM march test passed...
romPost: PERFORMING DRAM WALKING-ONE TEST...
romPost: DRAM Walking-one test passed.
romPost: PERFORMING NV-MEMORY WALKING-ONE TEST...
romPost: NV-MEMORY Walking-one test passed.
romPost: Disabling data Cache...
romPost: Data cache disabled.
romPost: Disabling instruction cache...
romPost: Instruction cache disabled.
romPost: Enabling instruction cache...
romPost: Instruction cache enabled.
romPost: POWER-UP DIAGNOSTIC COMPLETE.
Hel
VxWorks System Boot
Copyright 1984-1996 Wind River Systems, Inc.
CPU: Tektronix HPP - PowerPC 740
Version: 5.3.1
BSP version: 1.0.3.0
Creation date: Jun 28 2000, 16:52:12
Press any key to stop auto-boot...
0
auto-booting...
boot device : sm
processor number : 0
host name : host
file name : c:\vxBoot\vxWorks.st
inet on ethernet (e) : 192.168.0.2:ffffff00
inet on backplane (b): 192.168.0.2:ffffff00
host inet (h) : 192.168.0.1
gateway inet (g) : 192.168.0.2
user (u) : anonymous
ftp password (pw) : anonymous
flags (f) : 0x1008
target name (tn) : tds7000
startup script (s) : c:\vxBoot\topScript.hw
other (o) : nvfs=0x1000
Initializing backplane net with anchor at 0x1e80000... done.
Backplane anchor at 0x1e80000... Attaching network interface sm0... done
done.
Attaching network interface lo0... done.
PC1 dio device driver installed
Attaching DIO client... done.
Loading c:\vxBoot\vxWorks.st...1773516
Starting at 0x200000...
Initializing backplane net with anchor at 0x16e0000... done.
Backplane anchor at 0x16e0000... Attaching network interface sm0... done
done.
PC1 dio device driver installed
Attaching network interface lo0... done.
Adding 6008 symbols for standalone.
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]]]]]]]]]]]]]]]]]]]]]]]]]]]]] Development System
]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]] VxWorks version 5.3.1
]]]]]]]]]]]]]]]]]]]]]]]]]] KERNEL: WIND version 2.5
]]]]]]]]]]]]]]]]]]]]]]]]] Copyright Wind River Systems, Inc., 1984-1997
CPU: Tektronix HPP - PowerPC 740. Processor #0.
Memory Size: 0x2000000. BSP version 1.0.8.1 .
WDB: Ready.
usrNvFsInit: NAME=/nvram BASE=0xfd0ff100 BPB=512 BPT=8 NB=8 BO=0
nvfs: STATUS: Mounting existing NVRAM file system
KERNEL: THERMAL CONTROL INITIATED
Executing startup script c:\vxBoot\topScript.hw ...
dbFsIoctl: invalid code 3
################### topScript starts ###############################
cd "dbfs:c:/vxBoot"
value = 0 = 0x0
ld < TekScope.o
value = 23662048 = 0x1690de0
ld < TekScopeSM.o
value = 23661408 = 0x1690b60
pDbDev = ramDevCreate(0, 512, 1152, 1152, 0)
new symbol "pDbDev" added to symbol table.
pDbDev = 0x1692720: value = 23668544 = 0x1692740 = pDbDev + 0x20
pDBfs = dosFsMkfs("/db", pDbDev)
new symbol "pDBfs" added to symbol table.
pDBfs = 0x16909a0: value = 23661056 = 0x1690a00 = pDBfs + 0x60
copy ("TekScope.DBF", "/db/TekScope.DBF")
value = 0 = 0x0
overrideFPdefaults()
value = 0 = 0x0
measurePPCtimebase
value = 0 = 0x0
registerMemPartitionSizes ( 0x00000000 )
value = 0 = 0x0
semInitForQueueCheckLogMsg
value = 21818112 = 0x14ceb00
initSysWaiter()
value = 0 = 0x0
raxInit
value = 0 = 0x0
paiInit
done
value = 17770552 = 0x10f2838 = PaiBaseRegisterTable + 0x948
verifyAcqBoardID
value = 0 = 0x0
updateAcqProcFirmware("dbfs:c:/vxBoot/acqProc.hex")
0x16975c0 (tShell): AVR FLASH contents match file dbfs:c:/vxBoot/acqProc.hex - no programming needed.
value = 1 = 0x1
cd "pc:"
value = 0 = 0x0
raxInitializeDevices
0x16975c0 (tShell): >> Setting PLL to 1.25e+09 Hz.
done
0x16975c0 (tShell): (Re)starting Acq Processor
value = 23688080 = 0x1697390
excHookAdd(stopStressForException)
value = 17557980 = 0x10be9dc = stopStressForException
dsyInit
value = 21806728 = 0x14cbe88
dsyWPApplyNextRegs
value = 17760428 = 0x10f00ac = DsyRegisterTable + 0xab0
# remove '#' from next line to set powerup scope state to factory default:
# NvramClearDb = 1
nvram_initFileSys
0x16975c0 (tShell): >> Kernel version 1.0.8.1 does not match Boot ROM version 1.0.3.0
value = -49409789 = 0xfd0e1103 = pDbDev + 0xfba4e9e3
TmgrInit("/db")
0x16975c0 (tShell): NO BACKUP SERIAL NUMBER FOUND, RESTORING VALUE FROM DISK...
0x16975c0 (tShell): NO BACKUP SERIAL NUMBER FOUND, RESTORING VALUE FROM DISK...
value = 0 = 0x0
PhxProxyInit
value = 20819360 = 0x13dada0
rtlInit
value = 0 = 0x0
sysExtMemAddToPool memSysPartId,0x02000000,0x06000000
value = 0 = 0x0
hwAccount_init
0x16975c0 (tShell): >> Setting PLL to 1.25e+09 Hz.
sysEnetAddrGet: e1:21:aa:24:d7:a0
value = 7 = 0x7
GpibInit
value = 133284512 = 0x7f1c2a0
wfmMemInit(1)
value = 47300320 = 0x2d1bee0
vertInstall
value = 47293284 = 0x2d1a364
calConStatus = cc_init(2)
0x16975c0 (tShell): Reading 280 bytes of service cal data from EEPROM[0] into 0x2d1a240
0x16975c0 (tShell): nvMem_read succeeded
0x16975c0 (tShell): Reading 66 bytes of service cal data from EEPROM[280] into 0x2d1a300
0x16975c0 (tShell): nvMem_read succeeded
calConStatus = 0x1341eec: value = 0 = 0x0
updateTrigCal
value = 0 = 0x0
MathMeasCreateTheMathandMeasurementLibraries
value = 47120704 = 0x2cf0140
initAcqMapper
0x16975c0 (tShell): initAcqMapper: Enter
value = 0 = 0x0
trigMapInit
value = 0 = 0x0
dsyMapInit
value = 0 = 0x0
mathMapperInit
value = 0 = 0x0
utilMapInit
value = 47118048 = 0x2cef6e0
TmgrHookup
value = 0 = 0x0
PhxProxyHookup
value = 0 = 0x0
hookupAcqMapper
value = 20164752 = 0x133b090 = AcqMapperRtlDataList
MathMeasMapHookup
value = 23687912 = 0x16972e8
dsyMapHookup
value = 23688016 = 0x1697350
utilMapHookup
value = 23688048 = 0x1697370
rtlHookup
value = 0 = 0x0
horizMapHookup
value = 23688008 = 0x1697348
fastFrameMapHookup
value = 23688032 = 0x1697360
trigMapHookup
value = 23688040 = 0x1697368
vertMapHookup
value = 23688032 = 0x1697360
spcMapHookup
value = 23688032 = 0x1697360
autosetMapHookup
value = 23688072 = 0x1697388
timeSyncMapHookup
value = 23688064 = 0x1697380
auxTrigMapHookup
value = 23688048 = 0x1697370
dpoMapHookup
value = 23688040 = 0x1697368
TmgrStartup
value = 46244176 = 0x2c1a150
PhxProxyStartup
value = 46193632 = 0x2c0dbe0
taskDelay(2)
value = 0 = 0x0
gpibHwInitC
value = 0 = 0x0
gpibTaskSpawn
value = 45993600 = 0x2bdce80
gpibIoInit "/dbios/DBIO005","/dbios/DBIO006"
value = 45515104 = 0x2b68160
enablePowerupDiags = 0
enablePowerupDiags = 0x1311330: value = 0 = 0x0
runPowerupDiags
done
dipSwitch = 0x0, enablePowerupDiags = 0, puMode=0
CalDiagPowerUpDiagsEnabled = 0
!! SKIPPING POWERUP DIAGNOSTICS !!
0x2bc0c40 (digHFTask): >> Setting PLL to 1.25e+09 Hz.
0x2bc0c40 (digHFTask): >> Setting PLL to 1.25e+09 Hz.
0x2bc0c40 (digHFTask): >> Setting PLL to 1.25e+09 Hz.
value = 17780784 = 0x10f5030 = SoftSwitchesRegisterTable + 0x48
rtlStartup
value = 0 = 0x0
tsComp
value = 0 = 0x0
################### topScript ends ###############################
Done executing startup script c:\vxBoot\topScript.hw
KERNEL: RUNNING TIME SLICED AT 10 TICKS PER SLICE!
Then I executed SPC and obtained the following information:
-> 0x2c50a90 (CalWatch): Temperature transition into SPC-supporting range.
0x2ac28e8 (phaseCalAfterDiags): >> Setting PLL to 1.25e+09 Hz.
0x2b158d0 (SPC task): >> Ch3 sanity check gain error at 1010.00 mV/div : 1.00
0x2b158d0 (SPC task): >> Ch3 sanity check gain error at 2000.00 mV/div : 1.02
I performed SPC several times in a row and obtained the same results.
I tested the output waveforms of all channels, and only the baseline of CH3 channel was offset by about 25MV, but all operations and measurements were normal.
Is there anything I can do to solve this problem? Can someone with repair experience provide assistance? If anyone could help me, I would be extremely grateful!