Commodore MPS-803 User manual

CONTENTS
CHAPTER 1 SPECIFICATIONS................................................................ 1-1
I. Application.................................................................... 1—2
II. General eature 1—2
III. Structure 1—2
IV. Basic speci ications........................................................ 1—3
V. General speci ications
................................................... 1—4
VI. Functional speci ications
.............................................. 1—5
VII. Inter ace speci ications................................................. 1—11
CHAPTER 2 OPERATION
......................................................................... 2-1
I. Precautions.................................................................... 2—2
II. Parts identi ication........................................................ 2—3
III. Operating unctions ...................................................... 2—4
IV. Setting u p
.......... ’. .......................................................... 2—6
CHAPTER 3 OPERATING PRINCIPLE.................................................... 3-1
I. Operating principle........................................................ 3—2
II. Operating o the electronic parts
.................................. 3—6
CHAPTER 4 MAINTENANCE..........................................................................4-1
I. Notes or the maintenance
............................................ 4—2
II. Disassembly, replacement and
adjustment o parts........................................................ 4—3
III. Lubrication.................................................................... 4—17
CHAPTER 5 CIRCUIT DIAGRAMS ......................................................... 5-1
CHAPTER 6 PACKAGE DRAWINGS
.................................. 6-1
CHAPTER 7 TROUBLESHOOTING
........................................................ 7-1

1-1
CHAPTER 1
SPECIFICATIONS

1-2
I. Application
This Service Man al contains the service information of
Commodore personal comp ter printer model MPS-803.
II. General feat re
This is a bi-directional printer of dot impact system
sing 8 vertical dots, capable of printing 60 cps.
III. Str ct re
PRINTER CONTROL SECTION OPERATION PANEL SECTION
This printer is comprised of the printer control, printer
mechanical, operation panel and power s pply sections.

1-3
IV. Basic specifications
1. Printing method.
2. Head
...........
3. Print characters
4. Kinds of marks
5. Character code
........
6. Standard character size
7. Dot size ..............
8. Print speed ...........
9. Printing directions....
Mark printing.....
10. Max n mber of col mns..
11. Character pitch
.......
12. Line pitches ..........
13. Line feed speed .......
14. Paper feed method .....
15. Ink ribbon... .........
16. Print paper ...........
Dot matrix impact system
8-pin type
Alphabets in capital and
small letters, Arabic
n merals, symbols and
graphic elements
Random combination in
vertical and horizontal
directions of vertical 7-dot
nits.
COMMODORE 8-bit code
Vertical 7 dots (2.4mm)
Horizontal 5 dots (2.0mm)
0.3mm (wire diameter)
Horizontal pitch...1/60 inch
Vertical pitch
.... 1/72 inch
60 cps
Bi-directional shortest
distance printing
Uni-directional shortest
distance printing
(rightwards)
80 col mns
10 cpi
6 or 8 lpi (switch selectable)
72/7 lpi...mark printing
4 lps
.... character printing
(6 lpi)
5.6 lps...mark printing
Friction feed or Pin feed
(optional)
Cassette type fabric ribbon
width: 8mm
length: 10m
color: black
life: approx. 500,000
characters (ANK)
C t paper
A4 210.8mm (8.3 inches)
letter 216.0mm (8.5 inches)
Paper q ality: fine
Reg lar paper: 45-60 kg/ream
Transfer paper...
34kg/ream x 3
(chemical carbon paper)
Contin o s paper (option)
101.6mm (4.0 inches)
254mm (10.0 inches)
Paper q ality: fine
Reg lar paper...45-60kg/ream
Transfer paper..
34kg/ream x 3
(point- or line-pasted paper
only)
(chemical carbon paper)

1-4
17. Copying capability ........... original copy + 2 pieces
18. Detection f nctions
a. Home Position and Paper Empty switches
HOME POSITION SW: .Left end detection
.Printing starts of 24th p lse(dot)
after this SW is t rned OFF.
.Detecting this SW d ring printing
p ts the printer in ERROR mode, and
printing stops.
(LINE RELEASE)
b. PAPER EMPTY SW: .Paper empty detection
T rns ON after 3 lines from
mechanical detection.
19. Operational switching
Paper feed: Except mark print mode, either of 1/6 or 1/8
inch feed shall be selected.
Listener address: Shall be switched to 4 or 5.
20. Operation section
(1) SWITCH PANEL
(l).l POWER LAMP (red)
a. POWER indication and PE indication.
b. Flickers for PE detection, (at data inp t)
c. Flickers when MOTOR ERROR.
(1).2 LF SW
a. Has the MANUAL LF f nction when data is not inp t.
b. Has the PE CANCEL f nction.
c. Has the TEST PRINT START f nction.
V. General specifications
1. Power
....
1.1 Inp t
AC 100V/117V +10% 50Hz.60Hz (+2%)
AC 220V/240V +10% 50Hz.60Hz (+2%)
1.2 O tp t
+5V +5% (AC inp t + 10%)
+24V +4V (AC inp t + 10% test print)
2. Temperat re and h midity req irements in operation
......... temperat re 5°C - 40°C
h midity 10% - 80%
Wet-b lb:MAX 27°c No dew allowed.
3. R sh-in c rrent
......... 20A or less at rated voltage and
freq ency.
4. Leak c rrent
............ 1mA or less.
5. Power cons mption ....... 25W or less at test printing at
rated voltage and freq ency.
6. Ins lation resistance.... across AC - FG 500V
50M£2 and over
7. Ins lating strength ..... across AC - FG
No abnormality shall occ r after
applying 1000V AC for one min te.
8. External dimensions
..... 334 (W) x 206 (D) x 94 (H) mm
Refer to the Exterior Drawing
9. Weight .................. 3 kg (approx.)
10. Noise ................... 63dB or lower
(in rolling ASCII printing)
(when meas red by A-SLOW at lm
away horizontally from the front
face.)

1
20,000,000 characters and over
(ANK printing)
MTBF 4,000 ho rs....excl ding
head life
Conditions:
D ty for POWER ON time: 20%
D ty for characters: 25%
Line feed acc racy 4.23 + 1.0
(1/6 inch feed)
Acc m lative line feed acc racy
42.33 + 1.5
(10 lines, 1/6 inch feed)
Col mn alignment acc racy 0.4 or
less
Acc m lative col mn alignment
acc racy ( 10 lines) 1.0 or less
Line inclination 1.5 or less
letter paper
(when meas red across the first
and last characters) 0.7 or less
fanfold paper
(inclination to the sprocket
holes)
VI. F nctional specifications (ROM REVISION U32053A)
1. Principal f nctions
(a) Do ble-width character o tp t possible by command
designation.
(b) Mark printing possible. (BIT IMAGE o tp t)
(c) In mark printing, repetition possible by instr ction.
(d) Print start position can be designated by character or
dot. (POSITIONING)
(e) Standard characters, do ble-width characters and marks can
be mix-printed in one line.
(f) A tomatic printing when BUFFER FULL or OVER PRINT
possible.
(g) Print f nction self-checking program eq ipped.
(h) Reversal printing possible by command designation.
(i) From (") X' 22' to (") or CR code,
X' 00' - X' IF' and X' 80' - '9F' o tp t
the reversal characters of X' 40' - X' 5F' and X' CO' - X'
DF' respectively.
Note that CR code always exec tes carriage ret rn.
2. Print modes
(a) STANDARD CHR PRINT mode: bi-directional
(b) DOUBLE-WIDTH CHR PRINT mode: bi-directional
(c) MARK PRINT mode: ni-directional
Reversal print is ni-directional to avoid damaging the
print head.
For the character font, either of GRAPHIC (SA=0) or
BUSINESS (SA=7) mode can be designated by the secondary
address.
11. Head service life
12. D rability
......
13. Print q ality....

1-6
3. Interface specifications
COMMODORE serial interface
CON LINE range: from LISTENER ADDRESS reception to UNL
reception)
Refer to the INTERFACE SPECIFICATIONS.
4. F nction codes
(a) NL (X' OA')
Print command. Exec tes line feed after printing. Same
as LF if sed singly. Does not cancel PRINT mode.
Cancels RVS ON.
(b) CR (X’ OD')
Print command. Exec tes line feed after printing. Same
as LF if sed singly. Does not cancel PRINT mode.
Cancels RVS ON and X' 22' (") f nction.
(c) BS (X' 08')
Designation command for MARK PRINT mode. Exec tes MARK
PRINT mode after BS to SI or SO. POS and ESC-POS
designation right before BS inp t are invalid.
Valid stat s codes between BS and SI or SO are BS, POS,
ESC-POS, SUB, NL and CR.
MARK PRINT remains designated for the following line if NL
or CR is valid.
If 8th bit of the MARK data is "1” or "0", the data works
as f nction code.
(d) SO (X' OE')
Designation command for DOUBLE-WIDTH CHR PRINT mode.
This mode is valid after SO to SI or BS.
POS and ESC-POS designation right before SO inp t are
invalid.
Valid f nction codes between SO and SI or BS are SO, POS,
ESC-POS, GRAPH, BUSINESS, RVS ON, RVS OFF, NL and CR.
This mode remains designated for the following line if NL
or CR is valid.
(e) SI (X' OF')
Designation command for STANDARD CHR PRINT mode.
Use this print mode right after t rning on the power.
This print mode is valid after SI to SO or BS.
POS and ESC-POS designation right before SI inp t are
invalid.
Valid f nction codes between SI and SO or BS are SI, POS,
ESC-POS, GRAPH, BUSINESS, RVS ON, RVS OFF, NL and CR.
This print mode remains designated for the following line
if NL or CR is valid.

1-7
(f) POS (X' 10') POS"ab" ab is a 2-digit n meric code.
Designation of print start position.
Absol te position designation by standard character size.
ab£80 is invalid.
If n meric code is not sed,
position designation is not
g aranteed.
N
L
Print exec ted at 40th and 41st col mns
co nted from 0 with standard character size.
2 col mns of do ble-width character
In the example above, if 79 replaces 40, this designation
res lts in overprint. A tomatic line feed is done and
printing is done at 0 and 1st col mns, and line feed is
done.
Basically, printing data exceeds the printing range, OVER
PRINT occ rs d e to this designation and a tomatic line
feed is performed. Characters exceed incl ding the END
point are printed at the head of the following line.
If this designation is contin ed, only the last val e is
valid.
(g) ESC (X’ IB') ESC-POS-HP-LP
Designation for print start position.
Absol te position designation by dot.
0 1 2
Example
S
0
79
P
0
S 40
0 1 2 3 4 7 9
HP * X X
LP = P 8 P 7
Position = 0 0
X X
P 6 P 5
i
0 0
X X
P 4 P 3
0 0
HP.LP£480 is invalid.
P9
P 2 PI
P 9
.................. PI
Printing of standard and do ble-width characters after
designating 479SHP.LPS475 is a tomatic and done at the
head of the following line incl ding line feed.
Do ble-width characters after designating 479£HP.LP£469
are processed in the same way.
If this designation is contin ed, only the last val e is
valid. Only POS can be combined with ESC, print o tp t
except POS is not g aranteed.

1-8
(h) SUB (X* 1A') SUB.n.data(£128)
Repetitive designation command for MARK data.
This command is valid in the MARK PRINT mode, and SUB code
(1BYTE) is ignored in the STANDARD CHR and DOUBLE-WIDTH
CHR PRINT mode.
255in£0 If 0 is set, it is considered as 256.
exp.
S N
I A L
40 CHRS
0 239
ABC
B
S
S
U
B
D
A
T
As described in the position designation, standard and
do ble-width characters after designating
(479-239)£n2(475-239) are printed at the head of the
following line incl ding a tomatic printing and line feed.
Do ble-width characters after designating
(479-239)2n£(469-239) are processed in the same way.
If data val e of this command is smaller than 128, the
whole designation is ignored.
When data of this command exceeds the printing range,
printing proceeds and starts from the head of the
following line incl ding line feed.
(i) GRAPH (X' 91')
GRAPHIC mode designation command
(j) BUSINESS (X* 11')
BUSINESS mode designation command
The above two commands are sed to change the character
font.
This command is cancelled by the print command (CR, LF).
(k) RVS ON (X’ 12')
REVERSE designation command
(l) RVS OFF (X' 92’)
REVERSE cancel command
The above two f nctions are valid in the STANDARD and
DOUBLE-WIDTH CHR PRINT modes.
The designation command is cancelled by the print command
(CR, LF).
The above (i) (j) (k) (1) are not cancelled by a tomatic
line feed.
°- Undefined codes are ignored.
Those codes except POS, ESC-POS, SUB, NL and CR in the
MARK PRINT mode are ignored.

1-9
5. Reversal printing by ASCII (") X' 22'
X' 22' -X' 22' in STANDARD and DOUBLEO-WIDTH CHR PRINT
inodes or X' 00' - X' IF' and X' 80' - X' 9F' between CR
codes do not have their f nction and o tp t the reverse
character of X' 40' - X' 5F' and X' CO - X' DF'
respectively.
CR code always performs carriage ret rn.
Therefore, reverse of M is not possible by this f nction.
Ordinary character codes follow RVS ON/OFF.
RVS X’ 22’ or
OFF
RVS
ON
X’ 22 X' 01’ X* 02’ A B X’ 03’ X* 04’ X’ OD’
RVS NON-RVS RVS CANCEL
RVS, (") f nction is solely cancelled.
X’ 22 X’ or X* 02’ A B
I
___________________ I
RVS RVS
X’ 03’ X* 04’
RVS
X* 22’
(or X* OD’)
A
(") f nction and RVS ON are cancelled together. Not
cancelled by AUTO PRINT LINE FEED.
6. Secondary address
Secondary address is designated by n3 among OPEN, nl, n2
and n3.
Sent to the printer right after the listener address.
Secondary address is often omitted.
(a) Secondary address = 0 GRAPHIC mode
(b) " = 7 BUSINESS mode
(c) when omitted GRAPHIC mode
(d) when other than 0 or 7 •* Invalid
This f nction is valid in one ON LINE range, and is
switchable by X' 91', X ! 11'. If switched by X' 91', X'
11°, it is cancelled by PRINT COMMAND (CR, LF).
The data sent to the printer is secondary address + X'
60' .
7. Listener address
Listener address is selected to 4 or 5 by the switch on
the logic card.
The data sent to the printer is listener address + X' 20'.
8 . Paper feed f nction
Paper feed is exec ted by LF, CR and line feed after
printing.
Length of feed differs with the mode before.
STANDARD, DOUBLE-WIDTH CHR PRINT mode 1/6 inch*
MARK PRINT mode -*»7/72 inch
* Can select 1/6 or 1/8 by the switch on the logic card.
Feed by MANUAL switch is valid in OFF LINE mode.
Feed length follows the print mode right before UNL.

1-10
9. F nction codes are valid within the ON LINE range and the
f nction setting, set val e and data are held even in the
OFF LINE mode.
Note that GRAPH/BUSINESS mode follows the secondary
address at OPEN. If the same secondary address is
received when previo sly set by X' 91', X' 11' and when a
print command (CR, LF) is not received, mode setting by X'
91', X' 11' is held. If different secondary address is
received, the mode follows the secondary address.
10. Paper empty detection
® OFF LINE: Data is taken in. BUSY stat s t rns on at the
start of mechanical operation. At this time, PE detection
works and the POWER LAMP flickers. (at data inp t)
CLOCK
DATA
FLICKER
® ON LINE: Detection occ rs at data inp t. POWER LAMP
flickers. BUSY at the LAST data is valid.
* PE detection occ rs at 3 lines after mechanical
detection.
11. COMMODORE Serial Interface
. See Timing and Flow charts.
. See the Specifications for connectors and layo t.
12. A tomatic printing f nction
Two types are available.
(1) Print by data b ffer f ll
At the end of printing, the dot position holds the
last dot point.
This is d e to the control means, and there is no
difference between the inp t data and print o tp t.
In this case, printing is ni-directional in any
mode.

1-11
(2) When the data exceeds the print range.
When the data exceeds the print range, printing is
exec ted to the last col mn followed by a line feed.
Excess data is printed from the head of the following
line.
(Printing not started at the inp t of 480 col mns.)
If data exceeds the margin point, a to line feed is
exec ted and the excess data is printed on the
following line.
Reference: b ffer size 152 BYTE
N mber of bytes contained
POS: 4 SUB: 4
SI . SO . BS . NL . CR . RVS . GRAPH/BUSINESS: 1
13. Switch panel
(1) LF SW
(a) D ring OFF LINE, paper feed is exec ted witho t
regard to the paper.
Contin o s LF is exec ted by pressing it for over 0.5 sec.
(b) If once after the PE detection occ rs, load the paper
and press this switch to cancel the PE detection.
(Paper feed is not done.)
(c) This switch is invalid d ring ON LINE.
Still it has the f nction to cancel PE ntil the first
print command and b ffer f ll. Invalid after this ntil
UNL.
(d) T rn the power on while pressing this switch to start
a tomatic self printing.
(2) POWER LAMP
(a) Comes on when power is inp t.
(b) Flickers pon PE detection ntil it is cancelled.
(2.5 times/sec)
(c) Flickers pon the motor error. (10 times/sec)
14. Self diagnosis
(a) At POWER ON
If CPU operation is correct, the carriage moves to left
(HOME POSITION) and then to the center to stop.
(b) POWER ON while pressing LF SW
Self printing starts.
Performs f nction check excl ding the interface. D ring
self printing, man al line feed is invalid. T rn power
off to cancel the self diagnosis f nction.
VII. Interface specifications
1. Inp t connector (TCS4460-01-1011: Hoshi Elec. K. K.)
P IN NO. SIGNAL
1SERIAL SRQ
/s J J
1(2 ¡q22GND
3SERIAL ATN
J / 4SERIAL CLK
5SERIAL DATA
6RESET

1-12
2. Electrical req irements
Other req irements: refer to the circ it diagram.
LOW level 0.4 (V) or lower
Other req irements: refer to the circ it diagram.
3. INTERFACE CIRCUIT DIAGRAM
ATN
DATA
OV(GND)
CLOCK
RES
F.B.: FERRITE BEADS
CPU : yPD7811 (NEC)

1-13
4. Interface f nctions
a. Listener f nction directly connected by cable to CBM
serial b s.(SRQ, CLK and ATN signals are not controlled
by this device.)
b. Listener address can be set to 4 or 5 by switch.
Listener address 4: reception data 24 (hexadecimal)
Listener address 5: reception data 25 (hexadecimal)
c. Secondary address (SA) can be set to 0 or 7.
SA = 0 (reception data 60): GRAPHIC mode
SA =* 7 (reception data 67) : BUSINESS mode
d. Data inp t to this device does not finish ntil the
BUSY stat s inside this device goes off.
e. If this device t rns into the ERROR stat s d e to a
disorder within this device.
Response to the b s is not exec ted at all.
4.1 CBM serial interface
a. Data str ct re
LISTENER ADDRESS (SA) DATA LAST DATA UNL
ATN
E0I-HANDSHAKE SYSTEM
LINE-RELEASE
(1) Data is processed by synchrono s transfer with CLOCK.
(2) The first bit is the LSB. All the bits are of 8-bit
constr ction.
(3) Listener address data is X' 24 or X' 25. (4 or 5)
(4) SA is X' 60' or X' 67'. X' 60' is sed when SA is
omitted. (SA is 0, 7)
(5) If address is not identified.
SYSTEM LINE-RELEASE is exec ted.
DATA I
60 ■ 80 s TPR
1
--- SYSTEM LINE-RELEASE
REFERENCE
CLOCK Data sampling at rising

1-14
5. Program general flow
(This flowchart is not precise. Shows the conception of
data flow.)
INITIALIZE ROUTINE DATA RECEPTION & MAIN ROUTINE
DATA RECEPTION ROUTINE

1-15
LF SW INTERRUPT DATA PROCESSING ROUTINE
TO THE PRINT ROUTINE

PRINT ROUTINE 1—16
c
PRINT INTERRUPT
)
YES
MOTOR ERROR
4 LF
___ 1 LINE
FLAG CLEAR
PRINT DATA
READ IN
MSB CLEAR
HEAD DATA OUTPUT
HEADi ON
PULSE WIDTH TIMER
SETTING
'HEAD OFF
HEAD DATA CLEAR
RETURN
TO THE MAIN ROUTINE

0
1
2
•*>
j
4
5
6
7
8
9
A
B
C
D
E
F
1-17
5INESS MODE