I CONTROL DAC
3.5 Possible Fault Causes/Remedies
3.5.3 On-line Faults
Table 3.5.3 lists the faults in order from placing the 9914V on-line, through density and speed changes, to using the SCSI interface.
3 -14 9914V Servicing Manual 95 125456 (Draft Issue D)
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1 Cooling fan Inactive No mains power.
Power Supply fuse blown.
+24V rail faulty.
I nvestigation I remedy
Check source iis present Check 9914V is powered on Check input fuse
Replace with correct value & type Check +24 V arrives at fan
2 8-character display blank Oust after power-on, cooling fan active)
Power Supply fault. Measure output voltages
Connector fault. Check placemEmt & security Servo Control fault. Check I proc oJ, I led
Switch Fascia pcb fault. Substitute board
Faulty display Chip. Substitute board
3 8-character display extinguishes (previously functional) +5 V rail failed.
Mains supply failed ..
4 Display Indicates I POWER I
Power Supply fault (excl +5V).
Check @ POWEtr Supply board Check fuse I restore power
Run diagnostic program 73 Check at @ Power Supply board
TABLE 3.5.2(a) OFF-LINE FAULTS
Reference Suspect FRU
Front panel switch
4.0 A (120 V in) 6.0 A (240 V in)
Section 2 - Power Supply Description PS Section 2 - Power Supply Description PS
Section 7 Figure 3.3.1 On .. processor ok Section 7
Section 7
Section 2 - Power Supply Description See (1.) above
Section 5
Section 2 - Power Supply nescription
PS
P...) C' PS
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Faultl Possible causes Investigation I remedy Reference
5 Display active but not Indicating I LOCATING I or I OK I after power-on diagnostics
General fault Check/substitute FRU Section 3.3.1
Switch Facia board fault. Check/substitute board Sections 2 & 7 Servo Control board fault. Check/substitute board Sections 2 & 7
6 Loading fan always on
Drive circuit fault. Servo Control board
7 LD/ONL button not effective (ie no I LOCATING I indicated)
9 Other buttons not effective As (8)
Check @ Servo Control board Diagnostic program 45
Through connections
Check @ Servo Control
TABLE 3.5.2(b) OFF-LINE FAULTS
Section 2.3
Faultl Possible causes Investigation I remedy Reference
11 Tape not feeding from supply reel End attraction to bulk.
Loading fan fault.
Servo Control board fault.
Excessive air leak.
12 Take-up spool static (during load) TU motor fault.
Servo Control board fault.
Make longitudinal pinch at end
Manual load Section 3
Check driving ability (diagnostic program 04) Section 5 Check tape palth cover, or load manually Section 3
Check continuilty I brushes Section 7 Check driving ability (diagnostic program 49) Section 5
13 Tape forming concertina In
tape
path Caps missing.Servo Control board fault.
Check fixed guide caps are fitted Check roller caps are fitted
14 Tension arm off-centre (tape tensioned) Tension spring obstructed.
Position sensor fault.
Removel repos,ition obstruction Check output alt mid-position
TABLE :3.5.2(c) OFF-LINE FAULTS
Section 8
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15 DIAG not illuminating LED faulty I disconnected.
DIAG button faulty.
Servo Control board fault.
16 Data tests give frequent errors Likely causes:
Tape quality.
Dirty tape path.
ADP (or other) board fault.
Unlikely causes: Substitute & re-calibrate Identity faulty component
TABLE 3.S.2(d) OFF-LINE FAULTS
Reference
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Fault I Possible causes Investigation I rlemedy Reference Suspect FRU
r---17 Unstable tension arm (more than 10 mm travel during tape motion) Tension arm damping poor,
Servo gain incorrect.
Tape tension low, 18 BOT not found leader too short.
Marker not detected.
No BOT marker.
19 DensHy cannot be changed Tape not at BOT
Configuration option
Diagnostic prouram 48 Diagnostic pro{Jram 04 Check tension
Manual load
Check detection circuit Attach marker
Reverse to BOT
Operator changle forbidden
TABLE :3.5.2(e) OFF-LINE FAULTS
Section 5 Section 5 Section 3
Section 3 Section 7 ANSI/ECMA
Config byte 16
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Fault / Possible causes Investigation / remedy 1 ONLINE status does not latch (ie legend goes out) Tape not loaded.
DIAG illuminated.
RESET active.
LD/ONL button fault.
'Off-line' host command.
Loading door opened IFEN not asserted.
Cancel
Check @ Servo Control Check @ Servo Control
Close and secure all turnbuckles Config byte 08
2 ONLINE status Indicated, but subsequently drops out
Loading door opened Press LD/ONL
Door switch fault Check its operating point
Tape tension loss Diagnostic program 52 or 55
Run off EOT end of tape Check options/host software
Interface fault Try again/ examine host software
3 9914V not responding to any commands
Not on-line. If ONLINE not illuminated. press LD/ONL
Incorrect configuration. Examine Config bytes
Incorrect connections. Check Pertee SK 1/ SK2 are not interchanged or inverted
Incorrect address. Check Config byte 08 or 15
Unsuitable interface
TABLE 3.5.3(a) ON-LINE FAULTS
Reference Suspect FRU
Section 4
Section 4
Product Specification. M G8l05-A
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Fault I Possible causes
4 Density selection Ineffective Density not available.
3200 bpi available.
5 Speed selection Ineffective Operator panel enabled.
(inhibits interface).
Investigation I remedy
Con fig byte 18 Config byte 16, bit 4
Config byte 13, bit 3
6 9914V not responding to specific commands
Invalid command. INV CMD displayed
Non-standard command Unsuitable interface.
7 Hard error on every block
3200 bpi tape, Analyse selectod 800 bpi
without ident burst.
TABLE 3.5.3(b) ON-LINE FAULTS
Reference
Section 4 Section 4
Section 4
CM 1077 Config byte 16
Product Specification, M G8015-A
Set density to 800 bpi, review Config byte 09, bit 0
Suspect F R lJ
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8 Data transfer not reliable See off-line faults. Item 15 Unreliable interface.
Unsuitable interfacing.
9 Tape does not move forward Head> 3.6 m beyond EOT
Note: block may be only partially written
10 Unable to read a particular
tape
Tape is unreadableCircuit fault
Investigation I remedy
Unsuitable I misplaced interface connector
Rewind or reverse motion
Try on another machine Try a known readable tape Substitute DDP board
11 Does not go off-line after pressing RESET Tape in motion
Data still in SCSI (or PCI) buffer Host is powered off
Wait until it stops
Wait until buffer is cleared Wait about 10 seconds
TABLE 3.S.3(c) ON-LINE FAULTS
Reference Suspect FRU
Product Specification. M G8105-A
Section 4
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Fault I Possible causes Investigation I remedy 12 6250 bpi active after 3200 bpi selected
Alternative '6250 bpi' code Byte 16, bit 4 - 1
13 Read Strobes cease, part way through a block
Error in block Byte 07, bit 1
14 Host's SCSI bus unable to communicate with any unit
9914 V powered off, is last physical unit Arrange for 9914 V power on, or on the bus, and term pwr is set to 'int' review termination method
15 SCSI option switches are Ineffective
Byte 13, bit 4 - 1 Options taken from NVR, not switches, Configure from NVR, or
review 9914V's configuration
TABLE 3.5.3(d) ON-LINE FAULTS
Reference
Section 4
Section 4
SCSI User Manuals
Appendices G or E, or SCSI User Manuals
Suspect FRlJ