Radio Shack TRS-80 User manual

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COMPUTER
Catalog Number 26-1166
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Congratulations for selecting this
Radio Shack Computer Product!
The Line Printer VI is ahigh-speed, dot-matrix impact printer. The Printer includes aparallel
interface for connection to the TRS-80 Expansion Interface, TRS-80 Model II or Model III.
Abuilt-in microprocessor controls the Printer and the communication with TRS-80. Basic
operating instructions, self-test routines, and character patterns are resident in read-only mem-
ory (ROM).
Other exceptional features include:
•Bidirectional, minimum-distance access carriage action, for very efficient line-output.
•Upper and lower case English letters, English symbols, European symbols, and graphic part-
terns.
•Software-selectable print densities (5, 7.5, 10, or 15 characters per inch).
•Up to 132 characters per line.
•Software-selectable line densities (6, 8, or 12 lines per inch).
•Selectable friction feed or tractor feed for advancing printer paper.
•Accepts paper width up to 15 inches.
•Handless single or multi-part forms (Original +up to 2copies).
•Paper Out sensor automatically stops Printer if paper runs out.
•ON-LINE/OFF-LINE Modes.
•Manual controls for LINE-FEED, A1/.1.2 LINE, and RESET.
•Basic functional checks with SELF-TEST printing.
CONTENTS
Setting Up •
Ribbon Replacement ;-. :
Tractor Installation and Removal .*
Paper Loading and Penetration Adjustment *
o
Connection to Computer and Self-Test
Operation •
Power ON/OFF *•
Controls and Indicators
Control Codes -
9
9
9
10
Printable Characters, Symbols, and Graphics -12
Details of Printer Operations
14
Programming Examples
14
Hints and Tips *
15
Care and Maintenance
If You Have Problems -'$ 16
^^17
Specifications -*' " "
'
18
Schematic Diagrams -

SETTING UP
Carefully unpack the Printer. Be sure to locate the ribbon, the fuse, and the paper tray. Keep the empty
box and insulation material in case you ever need to transport the printer. Then remove two ties holding
the paper bail to platen
turning on the povvef could damage the printer.
Ribbon Replacement (Refer to Fig. 1and Fig. 2)
If the ribbon is already installed, simply check to see that it is threaded properly. Compare with Fig. 10
If the ribbon cassette is not installed, or if it is necessary to replace the ribbon (fraying or faint printing
at proper penetration setting), follow the instructions below.
1. Set Power switch to OFF position. (Note that when you turn power off, any information stored in
the printer's buffer will automatically be lost. So avoid this situation during program printing.)
2. Open printer plastic cover and move Penetration Control lever fully backward (away from platen).
3. Ribbon is in cassette which is held down at lower left and right sides to the cassette holder by stop-
per claws. Lift up the platen end slightly and remove by lifting up the entire cassette horizontally.
4. Tension the ribbon in new cassette by turning its knob in arrow direction.
5. Press down cassette until firmly secured by stopper claws.
Caution: If claws fail to hook on properly when cassette is pressed down, the cassette knob will'
not fit properly into shaft from the carriage. Do not force cassette down, but fit it in
gradually while turning cassette knob in arrow direction.
Insert portion of ribbon extending out from cassette into print head ribbon guide.
Manually move carriage to left and right to check that ribbon feeds out properly.
Note: Unless ribbon has been fitted properly into print head ribbon guide, printing and ribbon feed
will not operate smoothly.
Adjust Penetration Control Lever in accordance with instructions in section of "Paper Loading and
Penetration Adjustment".
6.
7.
8.
Ribbon
Cassette
Print Head \
Ribbon Cassette
Cassette Knob
Stopper Claw
Ribbon Guide
Shaft Groove
Penetration
Control Lever
Paper Empty
Switch Arm
Front Carriage Guide
Rear Carriage Guide
Figure 1Figure 2

Tractor Installation and Removal
With this printer, you can use either the tractor feed system or friction feed system. For tractor feed, use
the sprocket hole paper with the tractor already installed. When you want to use friction feed, you can
leave the tractor installed (but you'll find operation easier if you remove it). For friction feed, no need
for paper with holes.
Refer to Fig. 3.
To Remove Tractor
The printer comes supplied with the tractor already installed. When you want to use the printer with
friction feed, remove the tractor as outlined below.
1
.
Set Power switch to OFF position and remove upper plastic cover.
2. Hold the tractor cover at left and right sides with both hands, unlock by pulling up the rear part,
and pull upward.
3. Install upper plastic cover.
4. Set Power switch to ON position (set to operating condition).
To Install Tractor
To use the printer with the tractor feed system, install the tractor as outlined below.
1
.
Set Power switch to OFF position and remove upper plastic cover.
2. Hold the tractor cover at the left and right sides with both hands, and insert claw slots on lower
front sides of the tractor into printer studs.
3. Press the tractor cover back part until snaps into place.
4. Turn paper feed knob and check sprocket feed unit rotates.
5. Install upper plastic cover.
6. Set Power switch to ON position. (Printer now ready for operation.)
Tractor Cover Sprocket Unit Set Screw
Sprocket Feed Unit
Tractor Unit
Paper Feed Knob
Figure 3

Paper Loading and Penetration Adjustment
When Operating With Friction Feed System
You do not have to use paper with holes, but you should not use continuous-form paper.
Refer to Figures 4, 5, and 6as you go through followings.
1. Remove plastic cover.
2. Move penetration control lever fully backward (away from platen).
3. Pull release lever toward the front.
4. Release paper bail from platen by tilting backward.
5Insert paper through paper insertion opening at upper center of the printer and return release lever.
Turn paper feed knob until paper appears between the platen and paper scale.
7. Pull
r
o
e
l
e
t
aS
a
e
bout
e
i'-1/2" (3 or 4cm) of the paper and align the paper top. Return the release lever to
normal position.
8. Return paper bail to its position against paper and platen.
9. Adjust Penetration Control for optimum print quality as follows:
Mo^ Control Lever completely toward the platen. This provides maximum print head
penetration. For single-part forms, use this setting.
Mo!^ Control Lever toward platen until smudging appears on paper when carriage is
manually moved back and forth. Then back off the lever setting slightly till there is no.smudging
when the carriage or paper is moved. Leave lever setting at the closest catch-po.nt to this setting.
Note: If you use carbon-paper (or other duplicate form paper) with the friction feed system take
extreme care when setting up and using paper. There may be slight shifting of paper between
original and copy, resulting in poor printing or improper registration.
10. Replace plastic cover.
Penetration
Control Lever
Release Lever
Paper Feed Knob Paper Scale
Paper Feed
Knob
Figure 4Figure 5

Sprocket Unit
Tractor Unit
Figure 6
Release Lever-
Paper Feed Knob
Tractor Unit
Paper Tray
Forms
Figure 7
Paper Tray
Figure 8

Operating with Tractor Feed System
The printer will accept any standard tractor-feed paper from mailing label strips up to 15" (standard 132-
character paper). Paper can be single or multi-part, up to 3parts total.
Refer to Fig. 4, 6, and 7as you follow these instructions
1
.
Remove plastic cover.
2. Move penetration control lever fully backward (away from platen).
3. Pull release lever toward the front.
4. Be sure to install paper tray if not already in place. Refer to Fig. 8for installation method.
5Release paper bail from platen by tilting it backward.
6* Pass the paper through center part of paper tray and then through paper insertion opening at upper
center of printer. Return release lever. Turn paper feed knob until paper forward end appears be-
tween platen and paper scale.
7. Pull release lever toward the front.
Note: There is another paper-entry slot in the center bottom of the printer. Use this slot if your
Printer stand allows paper to enter directly into the bottom of the Printer. Th.s is convenient
for loading paper directly out of the paper box.
*Release the paper bail from platen. Insert paper through bottom paper insertion opening
and push the paper up until it appears between the platen and paper scale.
8. Pull paper out about 6" (15 cm).
9. Raise tractor paper holders and lay the paper over feed sprockets. Align paper holes with sprockets
and snap paper holders back on to the sprockets.
Note- 1If paper sprocket holes do not fit properly over the sprockets, loosen the screws on
sprocket unit and shift the unit for proper position and retighten set screws. If paper
is stretched too tightly or is loose and wrinkled, paper may not be fed properly.
2. When tractor feed is used, always have release lever pulled back.
10. Adjust Penetration Control for optimum print quality as follows:
Single-Part Forms .
Move Penetration Control completely to the platen for maximum print head penetrat.on. Use this
setting for all single-part forms.
Multi-Part Forms ,
Move Penetration Control lever toward the platen until paper smudges when carriage is shitted
manually back and forth across the paper. Then return the lever slightly backward until the paper
does not smudge when carriage is shifted; leave lever at the closest locking setting.
Note- Do not to allow the printed paper to pile on top of the unprinted paper stock, and take
care about the paper not to be led on the bent route (it could cause improper paper feed).

Connection to Computer and Self-Test
Before plugging the power cord into an AC power outlet, (120V AC for USA/Canada, 220/240V AC
for Europe/Australia) check the following:
(1
)
Is AC power line voltage full nominal value?
(2) Is printer Power switch in OFF position?
(3) Have you removed the black plastic protective tube from the carriage guide?
(4) Has ribbon cassette been set?
(5) Has 15" size print paper been set? If loaded with paper narrower than 15". be sure you don't
print wider than paper. Printing on the platen will shorten print head life (note that the self-test
uses the full width of 15" for printing).
If above is all OK, make aprint check before connecting the printer to the computer.
1
.
Plug Printer into AC power (rated voltage) outlet.
2. Set power switch to ON.
3. Set control switch to OFF-LINE.
4. Set the Self-Test switch on the rear to ON. Printer should print all characters in acontinuous se-
quence. Printing will continue until Self-Test switch is set to OFF or when control switch is set to
On-Line.
5. If test characters are printed too close to left margin (or extending out from left or right margin),
adjust paper to correct position by loosening screws on both sprocket units.
6. If printing is too light, move Penetration Control lever toward the platen. If printing is too dark or
is smudged, move Penetration Control lever backward (away from platen).
7. Set Self-Test switch to OFF and Power switch to OFF.
8. Install the cable for connection to Computer. Make sure that one end is provided with molded male
plug. Insert this plug into connector in the rear of the Printer. Do not force the plug. If it won't go
on one way, turn it over and try again. (See Fig. 9)
Note: ff the computer on hand is aTRS-80 Model I, use Catalog number 26-1401 interface cable.
If it is aTRS-80 Model II, use Catalog number 26-4401 interface cable.
9. Connect the other end of the cable to the Computer. If the Computer is aTRS-80 Model I, make
the connction to Line Printer Card Edge Connector of Expansion Interface. For aModel III connect
to the Line Printer connecten on the bottom. If it is aModel II, use the connector on the lower back
of the computer. Again if won't go in one way reverse the plug and try again.,
You may also use the "active" interface cable, 26-141 1, connected directly to the 40 pin bus of the model
Ieliminating the need for the expansion interface.
Figure 9TRS-80 Line Printer Connection to TRS-80
Connector (Female)
goes to TRS-80
Parallel
Printer-interface jack

OPERATION
Power ON/OFF
The power-up sequence varies slightly depending upon the computer system used With Mode. Iand Model
... sstems, ai. peripherals (printers included) shou.d be turnedIon before-PP^ ^^h
^
Following the recommended procedure for Model II systems, when the INSERT DISKETTE message
appears turn on the Printer and other peripherals -then insert system diskette.
Power lamp will remain .it while Printer is on. It is essential that the Printer remain on whil,,con ted
to the computer. An inactive printer can cause erratic operation of the system. Remember, also, that f
the power is removed or applied to the Printer while the CPU is running aprogram, voltage sp.kes could
cause program malfunction and/or loss of RAM memory.
Controls and Indicators
Tioto ON-LINE Printer will be in ON-LINE condition. When loaded with paper READY
lamp will come on, and the Printer will be ready to accept data from the
Computer.
Note: •When Printer has stopped due to Out-of-Paper condition, ALERT
lamp lights and automatically Printer goes OFF-LINE condition.
After inserting paper, press RESET switch once. Printer then re-
turns ON-LINE. Buffer data remains fully protected and printing
will proceed as normal. ~"~
Caution: Buffer data will be erased if RESET is pressed twice.
•If ERROR is detected due to carriage striking on left or right end,
clogged paper or other causes. Return Printer to initial state by
pressing RESET switch (you should realize that under this condi-
tion the buffer data will be erased).
Special Note for Model II computer: After encountering an alert condi-
tion error with aModel II system, you may have to type CONtinue,
and then the printer will continue printing from the stopped
head position. However, you should be aware that the entire
current line will be restarted from this location: therefore there
may be some printing duplication at this stopped line.
TiptoOFF-LINE ...Printer will be in OFF-LINE state. Information from computer will not be
received when at OFF-LINE condition, but following keys and switch
operations are possible.
LINE FEED key Press this key and Printer will advance paper one line. (If line feed pitch
has been changed by software control incremental advance will be per
pitch selection). Pressing key for several seconds will cause paper to feed
continuously. .
A1/12 LINE key Press to advance paper by 1/72 inch (1/12 line at 6characters/inch mode
SELF TEST swLh This switch is located on the rear of Printer. Set to ON and the Printer will
produce afull line of characters. This is useful for checking ribbon condi-
-tion and print quality. Do not use Self-Test switch unless the Printer is
loaded with 15" paper (or print head will strike the platen).

RESET key When Printer runs out of paper, inserting new paper and pressing this key
once will cause Printer to return to the state before Out-of-Paper. If pres-
sed during machine trouble or when pressed more than once after replac-
ing run-out the printer will return to the original on-line state (and data in
buffer will be lost).
Other Switches and Indicators
Switch/Indicator Location Function
POWER switch Right rear of Printer ON-OFF of Printer power
(Do not turn off Power switch when using
Computer)
Paper Empty switch Inside printer, near print
graduations 2
Notifies Printer control logic that paper
has run out. When actuated, ALERT lamp
lights and Printer goes OFF-LINE.
READY lamp On control panel Indicates Printer is ON-LINE.
ALERT lamp On control panel Indicates paper empty or carriage fault.
POWER lamp On control panel Indicates Printer is ON
Control Codes
According to American Standard Code for Information Interchange (ASCII), there are 34 control codes in
addition to the printable character codes. Control codes are sent as data which the receiving device in-
terprets as abbreviated instructions, communications-status messages, etc.
The Line Printer VI recognizes and executes 10 kinds of control codes and treats all other codes as spacing
acharacter.
Codes Function
Decimal Octal Hex Symbol
000 00 NUL These are ignored.
1001 01
10 or 138 012 0A LF Line Feed. When buffer information is
printed out, paper advances one line.
13or 141 015 0D CR Carriage return, All buffer information
printed out and next character printed from
start of next line. CR code following after
CR or LF is ignored.
27 •14 033- 016 1B •0E CON STR Sets to condensed-character mode. When this
two-code sequence is received, aCR is issued
and subsequent characters will be in 2/3 pitch
of previous characters pitch. Thus, if normal
(10 characters/inch) characters has been used,
15 character/inch pitch will be set. If elongated
characters (5 characters/inch) has been used,
7.5 character/inch pitch will be set. Next
character will be printed from start of new
line.

Codes Function
Decimal Octal Hex Symbol
27- 15 033- 017 1B •OF CON END Cancells condensed character command.
When this two-code sequence is received
return to character pitch before condensed
character was selected. Next data will be
printed from beginning of the line.
27 •28 033 •034 1B •1C 1/12"L Selects 12 Lines/inch mode. When this two-
code sequence is received all subsequent
line spacing will be 12 lines per inch.
This is normally used for graphic pattern
printing.
27 •54 033 •066 1B •36 1/6"L Select 6Lines/inch mode. When this two-code
sequence is received all subsequent line
spacing will be 6lines per inch.
Printer is in this condition when power is
turned on.
27 •56 033 •068 1B- 38 1/8"L Select 8Lines/inch mode. When this two-code
sequence is received successively, all sub-
sequent line spacing will be 8lines per inch.
30 036 1E NOR Cancels elongated character command.
Printer is in this condition mode when power
is turned on.
31 037 1F ELN Select elongated character mode.
All subsequent character pitches will be twice
that of normal characters.
127 177 7ForFF DEL These are ignored.
255 377 FF
Special Note
The condensed mode commands should be written into the center (or end) of aprogram line. When
executed, the CON STR brings the print head to the starting point of aline, but does not include aline
feed. As aresult you will get overprinting on the same line (if executed after some information has already
been printed for that line). Normal and expanded mode printing can be intermixed on the same line (but
condensed mode can not be mixed with any other).

Printable Characters, Symbols, and Graphics
Line Printer VI can print alphanumeric codes from hexadecimal 20 through hexadecimal 7E (decimal 32
through decimal 126), European codes from hexadecimal A0 through hexadecimal BF (decimal 160
through decimal 191), and graphic patterns from hexadecimal E0 through hexadecimal FE (decimal 224
through decimal 254).
Code Char. Code Char. Code Char. Code Char. Code Char.
Dec. Hex Oct. Dec. Hex Oct. Dec. Hex Oct. Dec. Hex Oct. Dec. Hex Oct.
32 20 40 (Space) 64 40 100 @96 60 140 \160 A0 240 (Blank) 224 E0 340 (Blank)
33 21 41 !65 41 101 A97 61 141 a161 A1 241 a225 E1 341
34 22 42 "66 42 102 B98 62 142 b162 A2 242 9226 E2 342
35 23 43 #67 43 103 c99 63 143 c163 A3 243 £227 E3 343
36 24 44 $68 44 104 D100 64 144 d164 A4 244 (Blank) 228 E4 344
37 25 45 %69 45 105 E101 65 145 e165 A5 245 M229 E5 345 s
38 26 46 &70 46 106 F102 66 146 f166 A6 246 230 E6 346 ^
39 27 47 '71 47 107 G103 67 147 g167 A7 247 T231 E7 347
40 28 50 (72 48 110 H104 68 150 h168 A8 250 t232 E8 350
41 29 51 )73 49 111 I105 69 151 i169 A9 251 §223 E9 351 1
42 2A 52 *74 4A 112 J106 6A 152 i170 AA 252 (Blank) 234 EA 352 1
43 2B 53 +75 4B 113 K107 6B 153 k171 AB 253 ©235 EB 353
44 2C 54 ,76 4C 114 L108 6C 154 I172 AC 254 %236 EC 354
45 2D 55 _77 4D 115 M109 6D 155 m173 AD 255 (Blank) 237 ED 355
46 2E 56 78 4E 116 N110 6E 156 n174 AE 256 %238 EE 356
47 2F 57 /79 4F 117 o111 6F 157 175 AF 257 11 239 EF 357
48 30 60 80 50 120 P112 70 160 P176 B0 260 ¥240 F0 360 r
49 31 61 181 51 121 Q113 71 161 q177 B1 261 A241 F1 361 —
50 32 62 282 52 122 R114 72 162 r178 B2 262 242 F2 362 n
51 33 63 383 53 123 S115 73 163 s179 B3 263 243 F3 363 ~r
52 34 64 484. 54 124 T116 74 164 t180 B4 264 c244 F4 364 h
53 35 65 585 55 125 U117 75 165 u181 B5 265 (Blank) 245 F5 365 1
54 36 66 686 56 126 V118 76 166 V182 B6 266 a246 F6 366 L
55 37 67 787 57 127 w119 77 167 w183 B7 267 6247 F7 367 J
56 38 70 888 58 130 x120 78 170 X184 B8 270 u248 F8 370 _L
57 39 71 989 59 131 Y121 79 171 y185 B9 271 249 F9 371 H
58 3A 72 90 5A 132 z122 7A 172 2186 BA 272 (Blank) 250 FA 372 -h
59 3B 73 ;91 5B 133 [(t) 123 7B 173 (187 BB 273 e251 FB 373 V
60 3C 74 <92 5C 134 \U) 124 7C 174 I188 BC 274 u252 FC 374 A
61 3D 75 =93 5D 135 ](H 125 7D 175 ]189 BD 275 e253 FD 375 ^
62 3E 76 >94 5E 136 t(-) 126 7E 176 ~190 BE 276 254 FE 376 k.
J63 3F 77 ?95 5F 137 -<-) 191 BF 277 /
Note: 1. European symbols and graphic patterns cannot be printed directly through key input, but
printing can be done by utilizing LPRINT CHFtS (decimal code).
2. If anon-defined code or hexadecimal 20 is received, the Printer will issue ahandle it as space
data (set aspace for one character). Since the carriage moves only the shortest distance, the
action will take place without unnecessary movement. If ablank code (in the above table) is
received, the carriage will move in the same manner as when receiving aprintable character.
When printing using blank code can be very convenient, and produce attractive/useful print-
out.
3. When using graphic code to prepare diagrams, line feed should be set to 1/12" per line. If
other paper feed pitch is used, the diagram will not be accurate.

If optional characters are desired, please contact your local Radio Shack store or Computer
Center.
Details of Printer Operation
The Printer starts aPrint cycle under any of the following conditions.
(A) Data buffer receives the 132nd character.
Normal width characters and elongated characters can be sent together. An elongated character is
counted as two characters. In case the 132nd character is of elongated one, the elongated character
corresponding to the 132nd (and 133rd) character is printed at the start of next line. In the con-
densed mode, the buffer will still fill and dump after the 132nd character. Because the pitch (charac-
ters per inch) is increased, the line length decrease to about 8.8" (22cm) long.
(B) When print data for at least one character is in the buffer and carriage return or line feed code is re-
ceived.
(C) When print data for at least one character is in the buffer and the next data is not received within
approximately one second.
(D) With normal or elongated mode specified, when condensed character command is received (CHR$
(27);CHR$(14)).
•In this case after all data in the buffer is printed the carriage will return to beginning of the line
before printing the condensed characters which follow. Without special care in programming
insertion of aCON STR command in the middle of aline will cause over-printing of characters.
(E) With condensed mode selected, when condensed mode cancellation code is received (CHR$ (27);
CHR$(15)).
•In this case after all data in the buffer is printed, the carriage will return to the beginning of the
line before continuing to print the characters which may follow. Condensed characters should
not be combined with other modes in the same line without special programming care.
Note: While in the elongated character mode and if an elongated character mode code is re-
ceived, or
While in normal character mode and an elongated character mode cancellation code is
is received, or
While in or condensed character mode and condensed character mode code is received, or
While normal character mode and condensed character cancellation code is received.
When aCR or LF code is received and after completing operation, asecond CR code is
again received.
All of the above under-lined (repetition of existing states) codes will be ignored.
•Yoihcan have your printer changed so that CR code is not ignored after receiving CR or LF code.
For details, see your nearest Radio Shack store or Computer Center.

Programming Examples
The basic statements LPRINT and LLLIST output to the Line Printer. See the Level II, Model II or Model
111BASIC Reference Manual for details of syntax.
Examples:
LLIST
Lists the resident program to the Printer.
LPRINT "THIS IS ATEST"
Prints the message in quotes and tells the Printer that the next printable character begins anew
line.
LPRINT "THIS IS PART OF ALINE "; :LPRINT "THIS IS THE REST"
Prints both messages on same line (because of the semicolon). The next printable character
received starts anew line,
LPRINT "SMALL"; CHR$ (31);' "LARGE"; CHR$ (30); "SMALL AGAIN"
Printing of normal and double-size characters on same line demonstrated.
LPRINT CHR$ (27); CHR$ (14); "CONDENSED"
Prints condensed characters.
LPRINT CHR$ (27); CHR$ (15); "NORMAL CHARACTER"
Cancels condensed character mode and returns to normal character.
LPRINT CHR$ (27); CHR$ (28)
Prints all subsequent lines at 12 lines per inch pitch.
LPRINT CHR$ (27); CHR$ (56) (or LPRINT CHR$ (27) "8")
Prints all subsequent lines at 8lines per inch pitch.
LPRINT CHR$ (27); CHR$ (54) (or LPRINT CHR$ (27) "6")
Prints all subsequent lines at 6lines per inch pitch.
Hints and Tips
1. Always plug printer into a3-wire grounded receptacle.
2. Ensure that upper cover is closed and secured while in operation.
3. Never operate printer without paper. If paper used is less than 15" wide, take care to see that print-
ing does not exceed paper width.
4. Avoid leaning objects against printer or placing anything on top. If any object is accidentally dropped
into the machine, turn power off and carefully take it out.
5. Be sure to turn off power before adjusting print head or replacing ribbon.
Note: When you turn power off, all data stored in Printer's buffer will be lost; keep this in mind
as you perform routine maintenance. Remember that toggling the printer's power can also
cause erratic operation of the CPU.
6. Use only lint-free cloth to clean printer surface. Do not use solvents or harsh cleaning agents. Mild
detergent solution or desk top cleanser may be used sparingly.
7. Keep hands away from carriage mechanism while printer is in operation. Since carriage moves with
considerable force, inserting hand would be extremely hazardous.
8. Printer must be kept dry. If water is accidently spilled on machine, turn off power immediately and
wipe dry. Do not turn on power until completely dry.
9. In case AC power voltage is above or below the rated voltage, use aconstant voltage regulated supply
to ensure stability.

CARE AND MAINTENANCE
Caution
•Do not use organic solvents or alcohol when cleaning the cover.
•Never operate Printer when upper plastic cover is opened because this is very dangerous.
•When replacing afuse, be sure to use the same type and rating (3A 250V).
•Never set the printer where it is exposed to direct sunlight.
•Set the printer on astrong secure stand secure to prevent it from vibrating while printing.
Maintenance (Refer to Fig. 10)
•If the print head becomes clogged with ribbon material or paper lint, carefully remove such ma-
terial with afinely pointed tool (needles, etc.). This should be checked regularly.
•Lightly oil the two carriage guides every three months. Use high-grade ester lubricating oil, but it
not available, use high-grade sewing machine oil. Lubricate carriage guide (1) by directly oiling
the oil ring (felt) installed in a4-mm hole in the carriage. Lubricate carriage guide (2) directly
at the oil ring in carriage.
•Lubricate platen revolving shaft (3), wire pulley shaft (4), and ribbon feed revolving shaft (5),
gear revolving shafts (6), and tractor unit sprocket revolving bearing (7) every three months. Use
molybdenum disulfide compound for lubrication.

IF YOU HAVE PROBLEMS
If printer fails to operate properly, try to solve the trouble by using the following table.
SYMPTOM
Printer does not operate when
POWER switch is turned ON.
Printer stops before paper
runs out.
Ribbon fails to track properly.
Poor print quality.
(Smudging, light printing)
Printer stops with ALERT
lamp lit.
INSPECTION and ADJUSTMENT
Is power cord properly connected?
Has fuse blown? If so, replace with same rating type (3A 250V).
Is paper empty switch's arm bent? If bent, correct by lightly
bending to former shape.
Is power source voltage too low? Printer may stop if below
90% of rated voltage. Use constant voltage regulator.
Is carriage guide dirty? If dirty, wipe clean with soft cloth and
apply high-grade Ester Lubricant Compound or high-grade
sewing machine oil.
Is ribbon cassette properly set?
Has ribbon come off from Print head ribbon guide and is loose?
Is ribbon so worn so that it does not feed smoothly from
cassette?
Is ribbon old and/or worn?
Is penetration control lever set at proper position?
If not, refer to Page 5and 7.
Is tip of print head dirty? If dirty, clean off with atoothpick
or needle.
Is paper loaded properly?
Is carriage guide dirty?
Has some object dropped inside printer?
If nothing is wrong, press RESET key.
If the trouble cannot be corrected after making the above check-up and adjustment, check for secure
contacts of all connectors. If the Printer Self-Test works okay, some other component in the system may
be at fault. If you can't eliminate the problem, bring the unit to your Radio Shack Store or Computer
Center for repair. We'll have it back to you ASAP!

10 per inch \
5per inch Software
15 per inch selectable
7.5 per inch
SPECIFICATIONS
Printing Speed Normal characters 100 characters/sec. 33 lines/min.
Condensed characters 120 characters/sec. 37 lines/min.
Characters per Line 132 maximum
Character Form 9mm (wide) x7mm (high) dot matrix
Vertical Spacing 6, 8, or 12 lines per inch (software selectable)
Horizontal Spacing Normal characters
Elongated characters
Condensed characters
Elongated condensed characters
Print Head Life 100 million characters
Other Mechanism Life 5million lines
Character Set ..Modified ASCII alphanumeric characters 94,
European symbols 26, and graphic patterns 30
Paper Feed Friction or Tractor
Interface 8-bit data, 4-bit status parallel
Expansion interface (26-1 140)
n-* **u. /ift-Mii\ ^> for TRS-80 Model I
Printer interface cable (26-1411) .../
Printer interface cable (26-4401) ... for TRS-80 Model II
Temperature range
Operating 41° F(5°C) to 104° F(40°C)
Storage ..-40°F (-40°C) to 160°F (71°C)
Humidity range
Operating 40% to 80% (No condensation)
Storage 20% to 90% (No condensation)
Paper Continuous business forms with sprocket holes in both sides
Width 4to 15 inches (ISO/R216)
(1) One original paper
88 to 132 lbs (40 to 60kg) good quality paper
(2) Copy paper (1 original +2copies)
75 lbs (34kg) non-carbon paper
(3) Carbon paper (two parts)
99 lbs (45kg) good quality paper, 38m carbon paper
Ribbon Radio Shack Catalog Number 26-1418
Size 24.2"(W) x6.3"(H) x13.3"(D)
Power Requirements 120V AC, 60Hz, Maximum 85W, 1.5A
220V/240V AC, 50Hz, for European/Australian models

SCHEMATIC DIAGRAMS
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LIMITED WARRANTY
For aperiod of 90 days from the date of delivery, Radio Shack war-
rants to the original purchaser that the computer hardware described
herein shall be free from defects in material and workmanship under
normal use and service. This warranty is only applicable to purchases
frofn Radio Shack company-owned retail outlets and through duly
authorized franchisees and dealers. The warranty shall be void if this
unit's case or cabinet is opened or if the unit is altered or modified.
During this period, if adefect should occur, the product must be re-
turned to aRadio Shack store or dealer for repair, and proof of pur-
chase must be presented. Purchaser's sole and exclusive remedy in the
event of defect is expressly limited to the correction of the defect by
adjustment, repair or replacement at Radio Shack's election and sole
expense, except there shall be no obligation to replace or repair items
which by their nature are expendable. No representation or other affir-
mation of fact, including, but not limited to, statements regarding
capacity, suitability for use, or performance of the equipment, shall
be or be deemed to be awarranty or representation by Radio Shack,
for any purpose, nor give rise to any liability or obligation of Radio
Shack whatsoever.
EXCEPT AS SPECIFICALLY PROVIDED IN THIS AGREEMENT,
THERE ARE NO OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRAN-
TIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE AND IN NO EVENT SHALL RADIO SHACK BE LIABLE
FOR LOSS OF PROFITS OR BENEFITS, INDIRECT, SPECIAL,
CONSEQUENTIAL OR OTHER SIMILAR DAMAGES ARISING OUT
OF ANY BREACH OF THIS WARRANTY OR OTHERWISE.
RADIO SHACK HADIVISION OF TANDY CORPORATION
U.S.A.: FORT WORTH, TEXAS 76102
CANADA: BARRIE, ONTARIO L4M 4W5
AUSTRALIA
280-316 VICTORIA ROAD
RY0ALMERE,N.S.W. 2116
TANDY CORPORATION
BELGIUM
PARC INOUSTRIEL 0E NANINNE
514QNANINNE
U.K.
BILSTON ROADWEDNESBURY
WEST MIDLANDS WS10 7JN
7A0 PRINTED IN JAPAN
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