Thi. ..ction contain. infor.ation to help you find the cau.. of the proble ••
Additional proble . . . ay be introduced if the NADINGS and CAUTIONS ue not ob.ened.
Section
2.5
ll10143
Beading
...uc:s
ad ClDfta.lfunin;.
caution Pa02 . . . zo AC distributon DC distdbution
CDn~.nu 2
Contents Probl.. isolation
RIOH3
Probl . . i.olation
2.1.1 Warning.
Extra high voltag •• ar. g.n.rat.d for the CRT within vid.o t.~inal. and . . in. voltag •• can be pr ••• nt even wh.n power i • • witched off at the t.~inal . . ins switch. Th • • ur.st w.j;C)f r •• oving pow.r frOia • uni t to be worked on is by
withdr.wing the . . in. input plug. Bow.v.r, even when the plug has been withdrawn, • high pot.ntial
•• y still .xi.t on th. p.d. .node n.ar to th.
front of the tube
SOiae adju.t.ents to CRT display. have to be done with the circuita .xpo •• d and power switched on.
Such .dju.t . . nt. should be c.rried out only b~
trained .ngineer. who ~.t ob •• rv. good .ngin . . ring practic.s to avoid injury .nd to .nsure their surviv.l in the .vent of .ccidental .hock ••
It has been found that a v.ry high vol tag. charg.
can be pr ••• nt on the EHT conn.ctor of • CRT .ven though a.in. power i. r •• oved .nd the t.rainal has be.n r.p.at.dly earthed. At .11 ti . . . . void
touching the t.~in.l on the tube eith.r directly, or through . . tallic tool ••
Gl . . . _sud
M.chanical shock to • c.thod. ray tub. .ay cau ••
the tube to i.plod. Violently. Tak. extra care when h.ndling tool. near to the CRT .nd shi.ld the gla •• with a cloth or f.lt r.straining •• diua. An
i.plosion could . . verly injure you and coll.agu ••
n •• rby.
T.ke part! eul.r care to .void cont.ct wi th high volt.g.. in the.. .r ••••
• The wiring on the 120/240 volta II&. adna input panel ¥bich i. not caapl.t.ly enclo.ed.
• The proc ••• or pow.r supply adju.tsent ¥bich i.
aaong .witching coapon.nta c.rrying hundr.d. of volts.
• T.blet pow.r unit. which have a aepar.t. 120/240 volta AC a.in. supply.
• Displ.y .onitor unit. which hav. an integral p.u with a 120/240 volt • • • ina input.
R10143
2.1.2 Cautions
So.. components on printed circiut Doards can be damaged by excessive voltages, regardless of current flow. Such component. are referred to a.
electrostatically sensitive device. (£SDs). To avoid damage to such devices froa aoveaent
Screen optical caatill9s
Some video terminals have a special anti-olare
Pield repair strateoy
Board or whole unit replacements are the expected .ethods of on-site repairs to equi~ent covered by this guide. Sub-unit replace.ents vill noraally be done by service centres, only in unusual·
situations will subunits like .ains transformer.
• and cathode ray tub •• be replaced on site. on the keyboard indiscriminataly.
Problea isolation
RI0143 Edition 1
Prable. i.alatian
The.. .ay contain error. which produce hard.are fault .yapta ... Run or have the u.er run the confidence teat. fir.t. See .ection 5
Rl0143
This subsection should help you to isolate problems to do with the power distribution.
2.2.1 AC distribution
If power is present at the processor unit and the circuit breaker is closed, the fans wll·1 be running.
If the fans run but DDS is not lit, check the a5c.
power connection to the PSU.
Consider that some monitor units have an internal PSU and will therefore have a seperate mains input require .. ent.
2.2.2 DC distribution
Take off the rear panel of the processor cabinet.
Measure the DC voltages at the supply except +24V and +55V which are measured at the bulkhead.
A circuit diagram of the DC distribution i.
provided in section 3.
Proble.. iS9lation
RI0143 Edition 1
Probl.. i.olation
•• tabli.hm.nt is coapl.t.d s.tisf.ctorily, the displ.y will r.ach 999, a nu.ber 1 ••• than 999
testing following functions of 2910.
NEXT, GOTO (various locations), simpl.
conditional GaTO, .ubroutine CALL and RETURN, two level .ubroutine CALL .nd RETURN.
checking condition.l branches need.d by the boot PROM - GTR, GEO, LEO, C19
t.sting 2910 LOAD S .nd REPEAT functigns testing control store
CPU board CPO board CPU bo.rd
Problem iaolation
2.3 P08 D1~tic,di.plar - continu.d
Display M.aning of display Possible faults
S2-6 SYSB-sy.te. boot loader
Th. transf.r ia fro. the flexidiac drive if a 'Boot Floppy' ia 17 unexpected network
interrupt
Retry using fresh 'Boot Floppy' or fixed disc 18 un.xpect.d X80 output interrupt 19 un.xpect.d video interrupt
20 unexpected Ethernet interrupt 21 unexpected .e.ory parity interrupt
EI0 board CPU board
Proble. isolation
2.3 P08 DIagaoetic diaplap - continued
Diaplay Meaning of diaplay Poaaible faulta
29 diaabling the CPU ROM CPU board
30 incre.enting the DDS up to 50 CPU board 50 error reporting mechanism in VPY haa not worked CPU board 51 'atack e!lpty' bit in .icro-atate regiater not CPU board
aet after a atack reaet
52 could not load TOS, or bit 0 not working CPU board 53 could not load fte. onto atack or Dit 1 not CPU board
working
54 'atack e!lpty' bit atill aet CPU board
55 one of 2 to 14 of the atack not working CPU board 56 'atack e!lpty' bit aet after only 15 loada CPU board
57 bit 15 not working CPU board
58 'atack e!lpty' bit aet after 16 loada CPU board 59 error reporting eachania. in VPY not WQrking CPU board 60 data error after unloading bit 14 fro. TOS word CPU board 61 data error after unloading bit 13 fra. TOS word CPU board 62 data error after unloading bit 12 fro. TOS word CPU board 63 data error after unloading bit 11 fro. TOS word CPU board 64 data error after unloading bit 10 fro. TOS word CPU board 65 data error after unloading bit 9 fro. TOS word CPU board 66 data error aft.er unloading bit 8 fro. TOS' word CPU board 67 data error after unloading bit 7 fro. TOS word CPU board 68 data error after unloading bit 6 fra. TOS word CPU board 69 data error after unloading bit 5 fro. TOS word CPU board 70 data error after unloading bit 4 fro. TOS word CPU board 71 data error after unloading bit 3 fro. TOS word CPU board 72 data error after unloading bit 2 fro. TOS word CPU board 73 'atack e!lpty' bit set after only 13 read. CPU board 74 data error after unloading bit 1 fro. TOS word CPU board 75 data error after unloading bit 0 fra. TOS word CPU board 76 atack e!lpty bit not aet after 15 reada CPU board
77 2910 call atack failure CPU board
78 odd did not jump on a 1 CPU board
79 odd jumped on a 0 CPU board
80 byte aign did not jump on 200 CPU board
81 byte sign jumped on 0 CPU board
82 C19 did not jump when it should have CPU board
RI0143
Edition 1 S2-7
Problem isolation
2.3 PD8 Di-vnoa~ic display - continued
Display Meaning of display Pos.ible faults
52-8
2.3
Proble. isolation
POS Diaono-tlc diaplay - continued 0182la:£ Meaning of di821a:£
117 MOX test failed
118 uQper 4 bits of stack f.iled 119 du.l Addres./retch4 te.t f.iled 120 unexpected aefill
121 81'<: text fa iled
130 unexpected network interrupt 131 unexpected Z80 output interrupt 132 unexpected Bthernet interrupt 133 data error on ._ory sweep
Display Meaning of display
163 Unexpected disc interrupt 164 Unexpected network Interrupt 165 Unexpected XIO output interrupt 166 Unexpected video interrupt 167 Unexpected Ethernet Interrupt
161 Unexpected • .-ory parity error interrupt
Proble. iaolation
Und.r control of POS initialiaation routinea:
200 Syate. entered. Init Meaory to be call.d
216 Te~orary a.gm.nt nuaber allocated
217 a.ading to enter loop to find ••• ory aiz.
Preble. isolation
2.3 PQ8 Di8gDOatic diaplay -continu.d
Display M.anino of display Possible faults
S2-12 302 Allocating buff.rs
303 Allocating buff.rs and s.tting SOli. variables 310 Initialising int.rrupt vectors
320 Initialising d.vice tabl.s 322 Initialising Ethernet 325 Bthern.t initialis.d
330 Initialising scr •• n, calling Init Tablet 340 Initialising tablet, calling Init Cursor 350 Initialising cursor
360 Initialising Z80
361 Interrupt now offJ about to send device table
Proble. isolation
2~3 POI D1~tic dtaplay - continued Di.play Meaning of di.play
380 Bntering Find Size, allocating buffers
381 Doing a 'nIAGREAO' to find .ize of rigid di.c
700 Operating console, calling Init Bxc.ptions 800 Failure in Init Ixceptiona 951 Bnabling .wapping
952 Bnabling .wapping
Pos.ible faults
Proble. i.olation
Unexpected interrupt while re.ding floppy Unexpected di.c interrupt while re.ding floppy
Unexpected network interrupt wb1le reading floppy
unexpected 180 output interrupt while .re.ding floppy
Unexpected video interrupt while re.ding floppy
Unexpected 3 Hx Ethernet interrupt while re.ding floppy
Unexpected .e.ary p.rity interrupt while re.ding floppy
Probl.. i.olation
2.4
.-x
D1~tic di8p~ - continu.d Display156 157 158 160 161
162 to 168 180 255 Not. 1
N.xt .v.nt/failure No .y.te ..
Pix.d di.c .rror Ploppy read error
Ch.ck.uII errur in aicrocod.
Check.uII .rror in C-cod.
Bad chann.l interrupt.
Floppy . . . k .rror
Loading .ucce •• fully co~l.t.d
Po •• ibl. fault.
Wrong but ton pr •••• d during booting Pix.d disc Floppy di.c Microcod. fil.
PNX fil.
Proc ••• or Ploppy disc Non.
Th... failure. are unlik.ly to be cau •• d by bardwar.. It 1. lIuch aor. lik.ly that the .oftwar. ha. for
.011.
r.a.on been corrupt.d. Try to cur. th. fault by booting froll a boot floppy and then recr.ating the fix.d disc bootstrap.IUOU3
Edition 1 S2-17
2.6 . . . Login
_ _ or ~n rejection
Thi. information will help you to:
• Ch.ck or .ltar UMr na •••• nd p ••• word.
• Recr •• t. ..lfo~ or not found profile fil ••
• R.lo.d .i •• ing .y.t •• fil ••
"'r_and~.
The following .t.p. will allow you to Check or .It.r u •• r n . . . nd p ••• word.. If the d.f.ult n . . . i. not accept.d, r.load the .i •• ing sy.t ••
fU. firat.
Load the .y.t •• , .nt.r d.t. and ti ...
Pre.. the return key when proapt.d for • n ••••
Thi. log. into the .y.t •• und.r the n ••• gue.t in p.rtition u •• r.
Li.t the n •••• known to the sy.t •• with the co_.nd
OSERCONTROL LIST
Add • new u •• r na •• to the li.t with the COlllland
ADCUSER u •• rna ••
A coa . . nd to·.dd • u.er .lr.ady li.ted allow. the p ••• word to be upd.ted.
Pre •• ing the return key wb.n proapted will enter • null p.ssword.
To upd.te • p.ssword type ADDUSER uaern •• e/PAS
U.eful inforaation .bout USERCONTROL i. provid.d
by HBLP.
Malfoned profile fil . . pr.v.nt logging in to th •
• y.t_.
The following .t.p. will .llow you to fon .alfoned or not found profile fil •••
Load the .y.t... Pr... the return k.y when prompt.d for • n.... Thi. log. into the sy.t ••
with the n •• e gu •• t in partition u •• r.
BOlT .y profile
To .x •• ih. .nd not. the cont.nts of my profile fil •• S •••• ction 5.1.3 for u •• of tb. EDITOR utility.
Del.t. the .alfoned profile file witb the co_and DELETE .y profile
Create a new profile file witb your na •• by copying tb. d.fault profile file.
COpy SYS:BOOT>DEFAUtr.PROFILE SYS:USER>mydir>ny profile file R10143
Edition 1