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Epson LQ-1500

The Epson LQ-1500 was Epson's first 24 pin dot matrix printer and was launched in 1984. It offered both greatly improved print quality and print speed over its 9 pin stablemates. The printer was offered with either a Parallel or Serial interface as standard. The parallel version has three sets of DIP (Dual In-line Package) switches two located on the rear panel of the printer and the third mounted on the main controller board below the printhead timing belt. The serial version has five sets also located on the rear panel and main controller board. These switches control certain printer functions and default settings, the details of which are listed below.

Switch No.FunctionOn (Up)Off (Down)
SW1-1BufferInvalidValid
SW1-2Paper-out SensorInvalidValid
SW1-3Auto-line feedAuto LFNo LF
SW1-4Not UsedAlways Off
SW2-1Character SetSee Character Table
SW2-2Character SetSee Character Table
SW2-3Character SetSee Character Table
SW2-4Form Length12"11"
SW2-51" Skip-over perforationValidInvalid
SW2-6BuzzerInvalidValid
SW2-7Print QualityNLQDraft
SW2-8Computer may switch the printer on or off-lineInvalidValid

Character Table

Character SetSW2-1SW2-2SW2-3
USAONONON
FranceONONOFF
GermanyONOFFON
UKONOFFOFF
DenmarkOFFONON
SwedenOFFONOFF
ItalyOFFOFFON
SpainOFFOFFOFF

A DIP Switch (SW1) is mounted on the main controller board. This switch is used when an optional Cut Sheet Feeder is used. All other switch settings on (SW1) are factory set and do not need to be changed.

Switch No.FunctionOnOff
SW1-8Cut Sheet FeederValidInvalid

Always disconnect the product from both the power source and the host computer before adjusting DIP switch SW1-8.

Switch No.FunctionOn (Up)Off (Down)
SW3-1Not UsedAlways Off
SW3-2BufferValidInvalid
SW3-3Buffer Recovery TimingSee Buffer Recovery Timing Table
SW3-4Buffer Recovery TimingSee Buffer Recovery Timing Table
SW3-5Self-Test OperationValidInvalid
SW3-6Self-Test SelectionLine MonitorLoop Back
SW4-1Word Length7 Bits8 Bits
SW4-2Parity CheckValidInvalid
SW4-3Even/Odd ParityEvenOdd
SW4-4Flag PolarityNegativePositive
SW4-5Baud RateSee Baud Rate Table
SW4-6Baud RateSee Baud Rate Table
SW4-7Baud RateSee Baud Rate Table
SW4-8Baud RateSee Baud Rate Table

Buffer Recovery Timing Table

Vacant area for bytesSW3-3SW3-4
152OFF (DOWN)OFF (DOWN)
288OFF (DOWN)ON (UP)
560ON (ON)OFF (DOWN)
1,936ON (UP)ON (UP)

Baud Rate Table

Baud RateSW4-5SW4-6SW4-7SW4-8
75ON (UP)ON (UP)ON (UP)ON (UP)
110ON (UP)ON (UP)ON (UP)OFF (DOWN)
134.5ON (UP)ON (UP)OFF (DOWN)ON (UP)
150ON (UP)ON (UP)OFF (DOWN)OFF (DOWN)
200ON (UP)OFF (DOWN)ON (UP)ON (UP)
300ON (UP)OFF (DOWN)ON (UP)OFF (DOWN)
600ON (UP)OFF (DOWN)OFF (DOWN)ON (UP)
1,200ON (UP)OFF (DOWN)OFF (DOWN)OFF (DOWN)
1,800OFF (DOWN)ON (UP)ON (UP)ON (UP)
2,400OFF (DOWN)ON (UP)ON (UP)OFF (DOWN)
9,800OFF (DOWN)ON (UP)OFF (DOWN)OFF (DOWN)
19,200OFF (DOWN)OFF (DOWN)ON (UP)ON (UP)