Beehive International B102 User manual

BlOO Series Terminals
BlOO, B102, B150, 8152, B160, B162
^ L»i=
Manual
JULY 1978
Thij document has been prepared by Beehive International and is furnished
on the condition that it will be used by the customer solely for the purpose
of supporting the operation, service and maintenance of Beehive products.
The rights of the customer with respect to this document will be governed
by mutually acceptable provisions of the contract with Beehive International.
This document shalt not be duplicated bythe customer, nor released, disclosed
or used, in whole or in part, for any purpose other than stated herein, without
the expresswritten permission of said Beehive International.
BEEHIVE INTER NATIONAL
«=lr^ =>^fiKS.SniLLBke C.lvUc.eMa'3125-P'^or-e IB01) 355 SOOO • Twx 9XD 925 5271
UUAi d 910 Amefca E»r^^^rL 0«^vc 'Bo* 2&6SB Soil, Lone uav. uten o ^ —.-oo .
l/uBOP«. Scrvpr^oi A,r-oort • D.W-O 7Q Ee«t • Tn« rv;etne.,ana» • Pnone 030->S15a2 1^. 152B
JluF*o«Hil?cJsia Mesa 540 e.i04 rm 9-0.595-2572 . Sunnyvale 1^08] 739--560 FLOBJDA A,«mon.e Sp^i^
SJoimA SWM5U45 ILLINOIS Elk Grove Village (2t2, S93-1565 MASSACHUteTTS ^"9>on ^6
WFW VOHK N9* YorK /2I2; 6e?-2760 OHIO Cinc.nnati (5t3l 621-8277 PENNSYLVANIA Plymoulh Meeang
TEXAS Dallas f2''J/3fl7.1856 UTAH SaB Lake Cily WO 355-6000 TWX 9'0-925-527i VIBQINIA Falls Chufch C703; 356-5 33 i
TM76-B100-2B/TM38-B150-2B

TABLE OF CONTENTS
SECTION TITLE PAGE
SECTION IV - THEORY OF OPERATION
4.1 INTRODUCTION 4-1
4.2 GENERAL FUNCTIONAL OVERVIEW. 4-1
4.2.1 Power Supply 4-1
4.2.2 CRT 4-1
4.2.3 Keyboard 4-5
4.2.4 Logic Board 4-5
4.3 OPERATIONAL FLOW DIAGRAMS 4-8
SECTION V - TROUBLESHOOTING
5.1 INTRODUCTION 5-1
5.2 PREVENTIVE MAINTENANCE 5-1
5.2.1 Troubleshooting Equipment 5-1
5.3 CORRECTIVE MAINTENANCE 5-1
5.3.1 Troubleshooting Preliminary Considerations 5-2
5.3.2 Troubleshooting Flow Diagrams . 5-2
5.3.3 Full-Duplex Echoplex Test 5-2
SECTION VI - DRAWINGS & SCHEMATICS
APPENDIX A - MONITOR
Section 1 - GENERAL INFORMATION
1.1 MONITOR DESCRIPTION A-1
Section 2 - THEORY OF OPERATION
2.1 VIDEO AMPLIFIER A-1
2.2 VERTICAL DEFLECTION A-2
2.3 HORIZONTAL DEFLECTION ........... A-4
Section 3 - PRELIMINARY ADJUSTMENTS
3.1 Synchronization and Drive Signals A-6
3.2 Brightness A-6
3.3 Video Contrast A-6
3.4 Vertical Adjustments A-7
3.5 Horizontal Adjustments A-7
3.6 Focus Adjustment A-8
3.7 Centering A-8
Section 4 - TROUBLESHOOTING and MAINTENANCE
4.1 Troubleshooting Guide A-9
iii

TABLE OF CONTENTS (concluded)
APPENDIX B - GLOSSARY
APPENDIX C - PROGRAMMABLE LOGIC ARRAY
Programmable LogicArray Inputs
Operation Code Assignment. . C5 ff
Program Listing
TABLE
5-1
FIGURE
4-1
4-2
LIST OF TABLES
DESCRIPTION
PAGE
Troubleshooting Flow Diagram Index 5-3 ff
LIST OF ILLUSTRATIONS
DESCRIPTION PAGE
Basic Block Diagram - B100/B102 ^*2
Basic Block Diagram - B150/B152 4*3
4-3 Power Supply Block Diagram
4-4 Character Dot Matrix
4-5 Character Dot Matrix of B150/B152
4-6 Timing Diagrams
4-7 Basic Functional Flow Diagram 4-9
4-8 Basic Functional Flow Diagram ^•'•0
5-1 Echoplex Test Connector ^*2
6-1 B100/B102 Logic Board . • . :
B100/B102 Logic Board Schematic b-^ tt
6-2 B150/B152/B160/B162 Logic Board. 6-18
B150/B152/B160/B162 Logic Board Schematic b-19 t-i-
6-3 B100/B150/B160 Case Removal 6-35
6-4 B100/B150/B160 Disassembly 6-36
6-5 B102/B152/B162 Disassembly 6-37
6-6 Keyboard Disassembly * * '
6-7 B100/B150/B160 Cable Assembly Drawing/Schematic. . . 6-39
6-8 B102/B152/B162 Cable Assembly Drawing/Schematic . . . 640
6-9 B100 Series Keyboard Assembly 112-1326 641
6-10 B100 Series Keyboard Assembly 112-1775 G-42
6-11 Keyboard Schematic 112-1326 643
6-12 Keyboard Schematic 112-1775 644
1 Voltage Waveform
2 Interconnecting Cabling Diagram A-11
3 Circuit Board Components Location A-11
4 TV5, 9 and 12 Without Power Supply A-12
IV

SECTION IV
Theory of Operation
4.1
INTRODUCTION
bly. The DC regulators used in the B100 Series
terminals are overcurrent and thermally protected.
The TOC type regulator is a 10 amp in the B100/
B102 and a 2 amp in the B150/B152 and is mounted
to the chassis via a large finned sink. The regulator
subassembly is connected to the Logic Board
through a cable assembly (see Figure -3). For
identification and specific regulator replacement,
consult the B100 Series Illustrated Parts Breakdown
under Section III, "Major Assembly Components."
RECTIFIER
RECTIFIER
TRANSFORMER
♦5
REGULATOR
IS
REGULATOR
ISvOC
This section of the Service Manual contains the
Theory of Operation for th6 B100 Series terminals.
This discussion is
presented as a functional descrip
tion at a detailed block diagram level referencing
appropriate functional blocks on the diagram. This
manual is intended to help the customer service the
terminal to a subassembly level. Individual compo
nent replacement Is not discussed in detail and the
customer is advised to send subassemblies to a quali
fied Beehive repair area for service, if required.
It should be noted that all BlOO Series terminals
operate similarly and are essentially identical. Where
there are critical differences, however, the manual
will indicate these with separate explanations.
4.2 GENERAL FUNCTIONAL OVERVIEW
The B10G Series consists of four basic functional
components: the main Logic Board (with Power
Supply),
the keyboard, the CRTwith electronics,
and small separately mounted chassis components
(i.e., fan, switches, filter, and regulator/transformer).
Figure
4-1 shows the basic functional block diagram
of the terminal. These functions are briefly described
in following paragraphs. Note that there are two
two different versions of the block diagram: Figure
4-1 describes the B100/B102 and Figure 4-2 de
scribes the B150/B152.
4.2.1 PowQr Supply
The Power Supply provides the required, regulated
DCvoltages
to the terminal. This assembly will
operate on 100, 115 or 230 VAC power 50/60 Hz.
Section II of the Operator Manual contains Power
Supply voltage change information.
The Power Supply provides +5, +15, +12, —12 VDC
to the circuitry from a standard AC sourca Figure
4-3 is a block diagram of the Power Supply subassem
^ 15/230 vACINPUT^
BLOCK
12
REGULATOR
4-1
RECTIFIER
-12
REGULATOR
l2vOC
-l2vOC
Figure4-3 Power Supply Block Diagram
The power applied to the Power Supply is stepped
down in voltage. The transformer output voltages
are rectified by three bridge circuits. The output
from the rectifiers and filters provides power to
the +5, +15, +12 and —12 VDC regulator circuits
These components are located on the Logic Board.
The main transformer is chassis mounted and con
nected to the Logic Board through acable assembly
(see Parts Manual Section III).
4.Z2 CRT
The Monitor Assembly includes a 12 inch (30.5cm),
diagonally measured, CRT and its supporting solid-
state circuitry. The nronitor is controlled by the

n
c
S
CO
_*
o
o
OT
O
ro
PLA INPUT SELECTION MODE
PROGRAMMABLE
LOGIC ARRAY
COMMAND DECODEB
» s a
2«(58S
3 *n « o
MAIN PORT
AUX PORT
DATA
op 2

(O
MAIN PORT
CONFIC.
SELECTION
AUX PORT
CONFIC
SELECTION
PORT
SELECTION
CIRCUIT
RECEIVER
DATA INPUT
BUFFER
OPERATION
INS MODE
format
BUSY
f MODE
CRVSTAL
OSCULATOR
DATA
UART
TRANSMITTER
MODE
BUSY
DATA READY
DOT POSITION
7 DPC
BAUD CLOCK
SELECTION
ROTARY
CHAR POSITION
^ 96 CPC
CHC
HAUD CLOCK CKT.
MAIN t;LK
AUX CLK
i SET/C
CHAR HLICHT
-10 CHC
CURSOR POS
CURSOR LINE
ROLL
WRITE
BUNK
SgTTgp
WRITE
PR01.
CURSOR POS
eUftjt6R LINE
SEQUENCE
COUNTER
SEQUENCE
VIDEO
CURSOR
GENERATION
CIRCUIT
CURL
CURSOR UNE REG.
BCURL
BUFFERED
CURSOR LINE
OPERATION
REGISTER
CURSOR UNE
roll counter
OPERATION
CHAR UNE
27 CLC
MEMORY
ADDRESS
MANIPULATION
192(9 X 1 BIT
BLINK
UI.INK
SYNC
CEN.
DRIVE
GEN.
BUNXAOW
CIRCUIT
COMPOSITE
VIDEO DRIVER
V DRIVE
H DRIVE
VIDEO
VIDEO
DRIVER
j CURSOR
VIDEO
SHIFT REGISTER
TO REMOTE
_ MONITOR
TO
MONITOR
1921J X I BIT
PROTECT
PR0fB6t
X 7 BITS
data REFRESH
MEMORY
CURP
CURSOR POSITION REG.
CURSOR POSITION
BCURP
BUFFERED
CURSOR POSITION
Roa
VIDEO
CURSOR
"OFF
SCREEN
CIRCUIT
CHARACTER
GENERATOR
UJWER
UPPER
^ CHC \
CASE
CASE
INSEBT/DELBTE
CIRCUIT
1
KEYBOARD
CONTROL
LOGIC
FROM
keyboard
Figure 4-2 Basic Block Diagram — B150/B152

vertical and horizontal synchronization signals
and the video signals generated on the Logic Board
A fj^l screen of information consists of 24 lines of
80 characters. The dot pattern for character
heights varies between B100/B102 and B150/B152.
The B100/B102 has a 9 dot character height with a
two-raster scan between characters and the B150/
B152 has a 10-dot character height with one raster
scan between lines if lower case characters are
used (see Figures 44 and 4-5).
Brightness and contrast adjustmentsare provided
by external potentiometers located on the rear
panel (see Section II of the Operator Manual).
Other monitor adjustments are discussed in Ap
pendix A.
OOT 0
lUM
ottrtn
eoT «
eoT 0
•LAM
eMtRiCTM
OltrLAT
eoT •
tLAM
ano o ooooooooo
"o
•o o o•oo•• • ••o
o•ooo•oo•oooo0
o•ooo•oo•ooooo
CMARACrCII .
ttlPkAT
o• • •••oo••••oo
o•ooo•oo•o0ooo
o•ooo•oo•ooooo
•ooo•oo•oooo o
oanooo o 0ooooo
1 r\
•AAo o o ooooo
ww
rOMClMOII
oooo o oooooooo
o•••••o o •o
o.
o•o
o•Oooooo•ooo•o
o•oo o ooo•ooo•o
eiUJIACTCII^
o• • ••ooo•••• • o
o• o ooooo•ooo•o
o•ooooo o •ooo•o
^o •oooooo•ooo•o
1 r\
("k o rj oo o ooooooo
•*o
oooooo o oooooo
roneuMOM
Figure 4-4 Character Dot Matrix
of B100/B102
4-4
The monitordisplaysdata on the CRT in a pattern
determined bythe vertical and horizontal synchro
nization signals and the video information driving
signals. A +15 DC voltage is applied bythe Power
Supply to the monitor.
Vertical Synchronization is applied to the vertical
oscillatorand triggers it at the vertical refresh rate
determined by the driving logic. The vertical fre
quency isstablized by the vertical frequencycon
trol, which determines the point of oscillation. The
output pulse of the vertical oscillator is applied to
the driver amplifier which shapes the pulseand is
controlled by the vertical linearitycontrol. The
output of the driver amplifier is applied to the
vertical driver by way of the height control. The
eiuiuett*^
mruT '
•O
'o
O
O
O
O •
O •
-O •
•o o
o o
•o o
o •
o •
o •
o •
o •
o •
o •
•o o
o o
BOt «
»ST 0
name
1.
o o
o o
o o
o •
o •
o o
o o
o •
o o
eiuiiieii*
>
o o o
tOT «
fLUM
Figure 4-5 Character Dot Matrix
of B150/B152

vertical driver output pulse is applied to the yoke
of the CRT and causes vertical deflection. The re
fresh rate is 50-60 Hz switch selectable.
Horizontal Synchronization pulses are applied to
the horizontal amplifier where they are amplified
and applied to the horizontal driver. The output
of the horizontal drive is applied through the width
coil to the yoke, where it causes the horizontal de
flection. The horizontal deflection signal Ts stepped
up to approximately 12 kvwhere it is then recti
fied, filtered and applied to the anode cap of the
CRT to provide the high voltage required.
Video
Information is applied to the video ampli
fier by way of the contrast control, external to
the monitor. The video information signal from
the video amplifier is applied to the cathode of
the CRT gun to cause an ON/OFF condition cor
responding to light patterns of the screen. The
brightness control is external to
the monitor and
varies
the voltage on the accelerating grid of the
CRT.
4.2.3 Keyboard
The Keyboard is the input device used by the
operator to communicate with the terminal. The
Keyboard contains the switches and supporting
circuitry to generate
the appropriate control sig
nals and ASCII codes utilized in the B100 Series
terminals. The Keyboard conforms to the pro
posed ANSI keyboard standard for data keys, but
has been expanded to facilitate the capabilities
of the B100 Series terminals. The ASCII code
chart is found in Section III of the Operator
Manual.
The Keyboard enables the operator to manually
input information to the terminal. When a key
is depressed, the keyboard logic generates the
corresponding 7-bit ASCII code and presents the
data in parallel form to the keyboard data lines.
After a short delay for debouncing, the strobe is
driven to its active level and returns after approxi
mately 30 milliseconds. For those keys which auto-
repeat, the strobe line is pulsed at a 15 character
per second rate. The BREAK key is not encoded
but is a function line that is driven low for approxi^
mately 400 ms when the key is depressed. The
following keyscause special 8-bit (non-ASCII)
4-5
codes: AUXSEND, CLEAR/HOM^ SEND,
EOS^ EOL, and DELETE CHAR. Thesecodes are
used internal to the CRT only and are not trans
mitted.
424 Logic Board
The Logic Board containsthe majorfunction and
control circuits in the B100 Series terminal. It also
holds all of the DC voltage regulators to power the
unit with exception of the +5V regulator. The
basic operations accomplished by the main logic
board are: Generation of data and control signals
for the monitor, interaction with the keyboard,
control of the data sent between the BlOO
terminals and any external device, and generation
of the basic timing signals essential for the oper
ation of the terminal. (See Figure 4-6)
Display Organization - B100/B102 —The main
timing chain (oscillator, dot position counter,
character position counter, character height
counter, and character linecounter) defines the
configuration of the display on the CRT. There
are 30 lines, six of which are used for vertical
retrace and 24 of which are used to display char
acters. The 30 lines are composed of nine scans
each,each scan being composed of 96 character
positions, 80 for display and 16 for horizontal re-
traca Each character block is composed of 7 x 9
dot matrix field which contains a 5x 7 character
matrixfor the displayed character (see Figure44).
DisplayOrganization - B150/B152 —The main
timing chain (oscillator, dot position counter, char
acter position counter, character height counter,
and character line counter) defines the configuratior
ofthe display on the CRT. There are27 lines, three
of which are used for vertical retrace and 24 of
which are used to display characters. The 27 lines
arecomposed of ten scans each, eachscan being
composed of 7x 10dot matrix field which contains
a 5 X7 character matrix for the displayed char
acter (see Figure 4-5).
Oscillator - The oscillator is crystal controlled
with a frequency of 10.8864 MHz. Two 74H04'!
are connected in series by a lOOpfcapacitor.

osc jTjuimfmiiruinmiirinjiruin
Bpci j-unjT__rTJTJ~i_rLrLri
—i_i—u—i—j—u—I I—1
__i 1 I 1 I 1
DPC8
U
FREQ - 10.8864 MHz
DOT POSITION COUNTER
FREQ - 1.5552 MHz
CHARACTER POSITION COUNTER
CPC1
CPC2
CPC4 _
CPC8 _
CPC16.
CPC32^
CPC64_
CPC80
juinnnjTJinnnnjiriAnnjiruuinjifuuifiiinJUinAnjinruiriJinjiJiAAJiri^
j—I m rn r
CHC1
n__rn m—r~L
CHC2
CHC4
CHC8
CLC1
J—i_rn i_f
CLC16
CLC2
CLC4
CLC16
Figure 4-6 Timing Diagrams
4-6
i_r-i_rn_r
CHARACTER HEIGHT
COUNTER
FREQ. ° 1.800 KHz
CHARACTER LINE
COUNTER
(50 Hz OPERATION)
FREQ "SO Hz
CHARACTER LINE
COUNTER
(60 Hz OPERATION)

Each 74H04 has a 1 kohm feedback resistor
around it. A 10.8864 iVIHz crystal is connected
from the input of the first 74H04 to the output
of the second. The output of the oscillator is
buffered, inverted and fed to the Dot Position
Counter.
Dot Position Counter - This divide-by-seven
counter defines each of the seven dots required
to compose one character. The outputs of this
four-stage counter are labeled DPCl, DPC2. DPC4
and DPC8. The counter actually presets to a
count of 10, counts up through the overflow
point at 15 to a count of zero, and presets back
to a count of 10. The Dot Position Counter
output DPC8 drives the Character Position
Counter.
Character t'\»sctcon Counter - The Character
Position Counter is composed of two binary
type counters that define 96 character posi
tions, each being seven dots wida The output
of the Character Position Counter drives the
Character Height Counter.
Character Height Counter - The Character
Height Counter is a standard counter that de
fines nine scans of 96 characters each, with each
character being seven dots wide. The output
of the Character Height Counter drives the
Character Line Counter.
Character Line Counter - The Character Line
Counter is a binary counter that starts at a
count of zero and counts to a maximum of 29
for a total of 30 character lines. The final out
put of this counter runs at the vertical refresh
rate.
Horizontal and Vertical Drive - The Horizontal
Drive is started when the Character Position Coun
ter leaves the video area of the scan and is active
for the following 40 character positions. The
high active ouiput of this flip-flop is sent to the
monitor on pin 9 of connector J1.
The Vertical Or've is generated during the time
the Character Line Counter is decoding 24.
Cursor Location Counter identifies the location
of the cursor. This is a count made from the Cur
sor Line Counter (called CURL) and the Cursor
Position Counter (called CURP). These two coun
ters, in conjunction with the ROLL counter, are
ised to address the memory to determine the entry
joint of the next character. The cursor location
4-7
counters are compared with the next character.
The cursor location counters are compared with
the Character Position Counter and the Character
Line Counter to generate the signal called CNTR
CURSOR. This signal is used to generate the cursor
displayed on the CRT. Also associated with the
cursor location counters is the appropriate circuitry
to move the cursor up, down, right, left; home, etc
A LINE FEED code causes the Cursor Line Counter
to increment by one. A CARRIAGE RETURN code
clears the Cursor Position Counter.
With the terminal operating in Format Mode, when
the cursor is incremented off the bottom line, the
cursor automatically wraps around to the top of
the display, i.e., the Cursor Line Counter is reset
to zero. However, if the terminal is not in Format
Mode, the display scrolls whenever the cursor incre
ments from a count of 23.
A scroll is initiated by any of three functions
if activated when the cursor is on the last line of
the display and the terminal is not in Format Mode:
a. LINE FEED or CTRL J
b. CURSOR DOWN or ESC B
c. If the cursor is on the last position of the
last line
1. Cursor right
2. Any displayable character
3. Space
Memory is actually a 2048 byte memory. Each
byte consists of 9 bits: 7 for data, one for protect,
and one for blink. Of these 2048 bytes, 1920 are
displayabl& The program does not have the capa
bility of displaying or writing into the remaining
128. In order to write data into the page memory
from the receiver, the memory address is muxed
over to the cursor location registers and the sig
nal WRITE is generated. The UART is then reset
and is capable of receiving the next character. The
page memory output is sent to the character gene
rator input buffer at the proper time to generate
the displayable characters. The program has the
capability of shutting down the screen refresh
for any given operation to increase the program
operating time.
Character Generator is a read-only memory (ROM)
that is addressed by the character (in ASCII). The
scan configuration and the chracter indicate the
pattern desired on that scan. Five-bit dot pat
terns are generated which form a portion of a

character. The output of the character generator
is applied to the parallel-to-serial video shift regis
ter.
Video Shift Register is parallel-to-serial loaded
with data by the low-active signal DPC8 and is
clocked by the main oscillatoroutput. The dots
are shifted out, mixed with cursor information
and blanking signals and appliedto the monitor
through the CXDNTRAST control as video infor
mation.
Input/Output Operations UART (Receiver) data
can be received by the B100 Series terminals from
one of three sources: from the two I/O interfaces
into the receive side of the UART or from the
keyboard through the transmit sideof the UART
to the receive side of the UART.
The UART is driven by a clock generated inter
nally off the main counter chain. No separate
oscillator is required. A rotary switch located on
the back panel switches the clock rate for oper
ation from 75 to 19200 baud The times-16 clock
isthen applied to the transmitter and receiver of
the UART.
The EIA line receiver receives data at RS232C
levels and gates them into the UART when on line.
Through the same gating, data isbroughtin from
the transmit side of the UART, where it is con
verted to parallel (7 bits) data.
UART (Transmit) keyboard data linesfor bits 1
through 7 areapplied to the transmit input data
lines along with the seven BUS lines. Also coming
from the keyboard circuit isa load signal which
triggers the UART to initiatethe transmission. As
the UART receives the character for transmission,
it performsthe appropriate parity generation, pro
vides one or two stop bits, divides the X16 clock
to get the baud rate,and transmitsthe character.
The character isapplied through an EIA RS232C
interface to the computer or modem.
Alsocoming from the UART is output data at a
TTL level which is applied to the receiver side of
the UART through the previously mentioned logic
The EIA interface includes aData Terminal Ready
signal which indicates the status ofthe unit to the
computer anda Request to Send signal which in
dicates that the terminal has data to send to the
computer. The Clear to Send line coming from the
computer ismonitored at the
EIA RS232C inter
4-8
face levels. It is received by a line receiver which
converts it to TTL levels and appliesit to the UART
clock control circuit to control transmission. An
optional X8 clock (TTL levels) is available aspart
of the interface. The BREAK key is on the key
board and enables a timer which holds the transmit
data line in a spacing condition fora predetermined
length of time.
Block Send Circuit allows the operator to compose
a message on the terminal screen andthen, depress
ing the SEND key, cause the terminal to send the
entire message to the computerat the selected baud
rate. Thesequence of operations isdescribed in
Figure 4-8.
The operation is as follows:
1.
2.
3.
4.
5.
6.
7.
Raise Request-to-Send
When Clear
to Send, send STX (002) header
Send data
If FORMAT and END OF PROTECTED FIELD,
send HT code (III3)
If not FORMAT and ENDOF LINE, send
CR/LF sequence (0159/0123)
When end of message, sent ETX (OO33)
Time out and drop Request to Send
Auxiliary Send Circuit is identical to the Block
Send except for two points:
1. The message istransmitted out the AUX
port insteadof the Main I/O port
2. The delimiters sent at the start of message,
end of unprotected field, end of line, and
ETX are selected from a different portion
of the Block Send ROM
Special Function (F1-F16) sends a code sequence to
the computer from the terminal. The code is insti
gatedby pressinggany one of the 16function keys.
1. An STX istransmitted (0223)
2. An Escape code (O333)
3. Code character (see /\SCII Code Chart, Table 3-2)
4. Andends with an ETX (OO33)
4.3 OPERATIONAL FLOW DIAGRAMS
See Figures 4-7 and 4-9. These diagrams give
the user an outline of the B100/B150 terminal
operation. Specific program information is con
tained in Appendix C and a list of programmable
I. C. part numbers and program numbers is con
tained in the Parts Breakdown Manual.

fx
(b
^escwait)
UU.
IN
UFFE
SAVE
CUBSOR
LOCATION
SEND
CURSOR
TO
UNE
23
REFRESH
DISABLE
SAVE
CURSOR
LOCATKMJ
WRITE
NULL
TO
MEM.
INCaCUR.
POSITION
URSOR
LLEGAL
clear
cur
POSITION
INCR
CUR
UNE
URSO
ILLEGAL
CLEAR
CURSOR
UNE
DECR.CUR
UNE
GO
TO
"BPT"
GO TO
"RTN
CURSOR"
GO
TO
"LF"
NULL
CODE
TO
REG
2
CLEAR
STORED
CURSOR
UNE
PROTECTED>V-
WRITE
NULL
TO
MEM.
INCaCUR.
POSITION
CURSOR
CLEAR
CURSOR
POSITION
CO
TO
"ADV
HOME
CURSOR
SAVE
CUR
LOCATIC»(
GO
TO
"FPr
GO
TO
"RTU
CURSOR
CO
TO
"BKSP
NULL
CODE
TO
REG
2
REG
2
BUS
DISABLE
CLEAR
CUR
POS.
!•
UNE
HOME
CURSOR
FMT
"OFF*
CLEAR
WRITE
PRCT
FLOP
SET
WRITE
PROT.
FLOP
ENABLE
KEYBO.
DISABLE
KEVBa
CO
TO
"FPT"
UTERAL
BUS
FIRE
TIMER
TIME
SEND
1st
BYTE
-SOM-
SEND
2nd
BYTE
-SOM-
CLR
CUR.
POSITION
DECa
STORED
CUR.
UNE
MEMCmY
BUS
DECa
STORED
CURSOR
INCaCUR
POSITION
Figure
4-7
Basic
Functional
Flow
Diagram
SETWRITE
UNK
FLO
CURSOR
ILLEGAL
INCaCUR.
POSITION
CURSO
ILLEGA
URSO
LEAR
W
UNK
FLO
UTERAL
BUS
SEND
lat
BYTE
END
UNPRQ]
SEND
2nd
BYTE
END
UNPRCI
SAVE
CURSOR
CLEAR
CUR.
UNE
ENABLE
AUX.
XMIT.
GO
TO
-FPT-
URSO
SEND
Ist
BYTE
-EOL-
SEND
2nd
BYTE
-EOL-
dECR
STORED
CUa
UNE
CLR.CUR.
POSITION
INCUCUR
UNE
SEND
ist
BYTEEOM
SEND
2nd
BYTE
EOM
I
FIRE
TIM
GO
TO
"IDLE-
SAVE
CURSOR
CLEAR
STORED
CURSOR
UNE
LOVEK
CASE
SAVE
BYTE
UNDER
CURSORl
WRITE
LC
CODE
TO
MEM
LCCODE—•RZ
SAVED
BYTE
TO
MEMORY
FIRE
TIMER
TIME
SEND
Ist
BYTE
-
STX
-
SEND
2nd
BYTE
-
ESC-
SEND
IC
CODE
FROM
R2
ND
3rd
BYTE
-
ETX
-
i
I FIRE
HM^
TIME

o
ULL
I
BUFFER
DEL.
IN
buffer
INCR
CUR
POSITION
ILLEGAL
CLEAR
CURSOR
l>OSlTION
GOTO*lF
lUXGAL
TO
TO'BIt'
CR
CODE
CLEAR
CURSOR
POS.
GO
TO'FPT
HOME
CURSOR
GO
TO
IDU
^N
CURSO^
DECR
STORED
UNE
COUNT
DECR
STORED
POS.
COUNT
ILLEGAL
INCR
CUR.
posmoN
ILLEGAL
LEAR
CURSOR
POSITION
INCR.
CUR.
UNE
DECR.
SrCMED
UNE
COUNT
DECR
STORED
POS.
COUNT
LF
CODE
INCR.CUR.
UNE
CURSOR
LLEGAL
FMT
MODE
SAVE
CURSOR
posmoN
ERASE
BOTTOM
LINE
CURSOR
TO
FIRST
POS.
LASTUNE
GO
TO
RTN
CURSOR
GO
TOTPT
BKSP
CODE
DECR
CUR.
POS.
GO
TOW
URSOR
ILLEGAL
CURSOR
TO
POS.
79
CO
TO'UP
GOTO
•idle*
GO TO'BKSP *
Qpowmoj^
HARDWARE
CLEAR;
i:uR.posiriOM
CUR
UNE
WRITE
PROT
GOTO*EOS
FIRE
BEEPER
GO
TO*FPr*
INCR
CUR.
POSmON
ILLEGAL
CLEAR
CUR
POSITION
IMCR.
CUR.
UNE
ILLEGAL
•home*
CURSOR
GOTO
CODE
SAVE
CURSOR
CLEAR
CURSOR
GO
TO
•start
send*
GO
TO'ADV.*
Figure
4-8
Basic
Functional
Flow
Diagram
C1£AR
INPUT
BUFFER
SETSEQS
GOTO
ESC.VAIT*
!V
CTRU
CODE
INSERT
MODE
SAVE
BYTE
UNDER
CUR.
IN
REG
1
WRITE
NEW
CODE
UNDER
CURSOR
REFRESH
OfF
SAVE
CUR.
POSmON
INCR
CUR.
POSmON
ILLEGAL
RE&2
MEMOBY
WRITE
NEW
BYTE
UNDER
CURSOR
I
GOTO^DV.
CLEAR
CURSOR
POSmON
INCR.
CUR.
GOTO
•rtn
cursor'

SECTION V
Troubleshooting
5.1
INTRODUCTION
This section contains information to aid in the
maintenance of the B100 Series terminsL Pre
ventive ard corrective maintenance procedures
are specified, as well as troubleshooting aids
and techniques.
5.2 PREVENTIVE MAINTENANCE
No scheduled periodic maintenance is required.
Hovv-ever, several precautions can be taken
periodically to ensure proper operation. Care
should bs exercised to see that there is proper
air circulation for the fan. The terminal should
not be placed on ashag carpet or other soft sur
face that could impede the air entrance to the
fan. Special care must be taken to ensure that
no paper or other loose articles are placed under
the terminal. The degree of dust density in the
air shou^ be considered in selecting the location
of the Lsrminal.
The interior of the unit may be wiped free of
dust. Acci'nr?ulation of dirt causes overheating and
component break ^f)\vn. Dirt acts as an insulating
blanket and D'e^'-^nts efficient heat dissipation. A
small brush is very useful for dislodging dirt; a cot
ton-tipped applicator is good for narrow or hard
to get places.
The following is a list of the troubleshooting aids
that are provided in this manual to assist in the
troubleshooting of functional failures.
5-1
Circuit Schematics
Detail Block Diagram
Functional Flow Diagram
Timing Diagrams
Glossary of Terms
Troubleshooting Flow
Diagrams
Disassembly/Assembly
Procedures
Adjustment Procedures
Configuration /Strapping
Information
Character Dot Matrix
See Section VI
See Section IV,
Figures 1,2, 7 & 8
See Section IV,
Figure 6
See Appendix
This Section
See Section VI
See Section 11
See Section IV,
Figures 4 & 5
5.2.1 Troubleshooting Equipment
The following is a list of tools and standard equip
ment required to repair aB100Series terminal:
V/0 Multimeter
Oscilloscope
Assorted Electronic Hand Tools
5.3
CORRECTIVE MAINTENANCE
This section provides corrective maintenance in
formation to aid in servicing the B100 Series termi
nal. It is suggested that the configurations sheet
end the turn-on procedure be consulted before
performing the corrective maintenance described
here. (See Section Ml)

5.3.1 Troubleshooting Preliminary Considerations
The most common problems occurring in the B100
Series units are switch, control and operation-
related. A simple procedure may be followed to
help determine if the problem iscontrol and/or
operation related or internal circuitry related
by checking the following:
Illegal Operation (Refer to Section II)
Improper Baud Rate Setting
Wrong Transmit or Receive Mode
Loose Interconnect Cable
5.3.2 Troubleshooting Flow Diagrams
Alist of troubleshooting flow diagrams is given
in Table 5-1. This index lists apparent failure and
refers the user to the proper flow diagram. The
table is only intended to allow the user to verify
the subassembly where trouble exists and not to
indicate the specific problem. The user is advised
to return the defective subassembiy and have that
subassembly repaired or replaced by an authorized
service agent.
1. Find the apparent trouble in the Trou
bleshooting Flow Diagram Index.
2. Proceed to the specified Troubleshoot
ing Flow Diagram in the diagram section
and begin the troubleshooting procedure.
3. If an adjustment procedure is referen
ced in the Troubleshooting Flow Diagram,
perform the adjustment and return to the
flow diagram to complete.the trouble
shooting process.
4. Reference is made to Timing diagrams
contained in (Section VI) this manual.
5.3.3 Full-Duplex Echoplex Test
Aspecially wired connector may be assembled
that will allow the operator to perform this test.
This connector tester allows the terminal to be
operated and tested Independent of an external
data device. The connector mates with the Main
I/O Port. Set-up for the test is as follows:
FDX (Full Duplex Mode)
Baud Rate - Any Setting
Test Connector Installed
in the I/O Port
5-2
Enter data from the keyboard as you would if you
were on-line to acomputer. If data is displayed
on the screen properly, then the 8100 series unit is
transmitting and receiving data properly.
The Test Connector is wired as follows:
(Refer to Figure 5.1.)
Connects Transmitted Data Line out of
the terminal to received data line into the
terminal. Pin 2 to Pin 3 of the I/O Port.
Pin 3
Pin 2
Jumper between
Pin 2 and Pin 3
0
(D
Amphenol Male Type
Connector
Beehive Part No. 606-0011-25 AP
FIGURE 5-1
ECHOPLEX TEST CONNECTOR

Table 5-1. Troubleshooting Flow DIagrann Index
Apparent Failure
Troubleshooting
Flow Diagram
GENERAL
No raster present
5-1A
No raster present
5-1B
OFF LINE
Cursor either absent, multiple cursors, cursor not in home position or
screen filled with video blocks
5-2A
No character displayed when written,non cursor advance
5-2B
Wrong character displayed
5-2C
No escape functions
5-2D
No control functions
5-2E
ON LINE
No data being transmitted
5-3A
Transmits invalid data
5-3B
No reception
5-3C
Receives invalid data and/or improper parity
5-3D
DISPLAY
All displayed characters out of focus
5-4A
Roiling display
5-4B
Display too tall/short for screen size
5-4C
Height of displayed characters uneven
5-4D
Display too wide/narrow for screen size
5-4E
Display not centered
5-4F
Tilted display
5-4G
Others
A. Single vertical line
B. Physical damage
C. Dot in center of screen
D. Uneven intensity/focus
E. Burned phosphor
F. Uneven display dimensions
G. Excessive H.V. Arcing
5-4 H
5-3

START
IS KBD
plugged
IN
YES
IS
'"BRIGHTNESS"'
CONTROL
ADJ
YES
IS
monitor
PLUGGED
in
YES
NO
PLUG
IN
KEYBOARD
NO
ADJUST
BRIGHTNESS
CONTROL AT
REAR OF UNIT
NO
PLUG
MONITOR
IN
IS
PROBLEM
SOLVED
IS
PROBLEM
SOLVED
IS
PROBLEM
SOLVED
IS
15 VDC
PRESENT
^MON PI 2-6,
IS
+ 15 VDC
PRESENT
LOGIC CAR
NO
REPLACE
BOARD
YES
IS
HORIZ
DRIVE SIGNAL
PRESEN
REPLACE WIRING
HARNESS FROM
LOGIC CARD TO
MONITOR
NO
REPLACE
LOGIC
/
CARD
\
IS
PROBLEM
SOLVED
END
YES
REPL
MON
^CE
ITOR
5-nA
CjEj
5-4
)

START
IS
TERMINAL ^
PLUGGED ^
IN
IS
POWER
SWITCH
ON
IS
CIRCUIT
BREAKER
GOOD
AR
TRANS
IRE HARNESSE
ONNECTE
IS POWER
SWITCH
ON
IS
5VDC OR
+ 15VDC
PRESENT
at Power Supply
(
NO
NO
PLUG TERMINAL
INTO PROPER
POWER SOURCE
TURN POWER
SWITCH LOCATED
ON REAR PANEL
TO THE ON
POSITION
DEPRESS
CIRCUIT
BREAKER
LOCATED ON
BACK PANEL
mammmuiMamm
CONNECT 1
WIRE ;
NO
HARNESSES
3
REPLACE
SWITCH
REPLACE
LOGIC
CARD
5-5
IS
PROBLEM
SOLVED
IS
PROBLEM
SOLVED
IS
PROBLEM
SOLVED
IS
PROBLEM
SOLVED
IS
PROBLEM
SOLVED
(
(
CHD
5-nB
)

REFER TO TURN ON
procedure
CONTRAST
PROPERLY
w adj. >
YES
miGHTNESi
PROPERLY
w adj. ^
YES
^ VIDEO ^
information
WCORRECTV
YES
replace
monitor
NO
NO
NO
PROPERLY
ADJUST
CONTRAST
PROPERLY
ADJUST
BRIGHTNESS
REPLACE
LOGIC CARD
END
5-6
PROBLEM
SOLVED^
NO
PROBLEM
SOLVED^
NO
END
YES
YES
END
END

IS
KBD
PLUGGED
IN
NO
PLUG IN
KEYBOARD
CARD
YES
REPl
LOGIC
.ACE
CARD
C
END
IS
KBD PC
PLUGGED IN
M-6
5-7
IS
PROBLEM
SOLVED
CONNECT
KEYBOARD
PC TO P-9
ANDTIMING
REPLACE
KEYBOARD
IS
PROBLEM
SOLVED
REPLACE
KEYBOARD
HARNESS
IS
PROBLEM
SOLVED
YES