SCOTLAND'S leading independent printed circuit board (PCB) firm issued a stark profits warning yesterday, while a second PCB manufacturer, based in the Borders, prepared to put its employees on a short-time working week.

Prestwick Holdings announced late yesterday afternoon that the ''rapid and severe'' deterioration of the global electronics market meant the Ayr-based company was unlikely to generate a profit in the current financial year, which ends on August 2.

Meanwhile, Signum Circuits cited similar reasons for its decision to cut back man hours at its Selkirk plant.

The developments follow rapidly on the heels of similar announcements by other computer-related companies north of the Border.

At one end of the spectrum is Donprint, Jarvis Porter's computer label manufacturing subsidiary based in East Kilbride.

Earlier this week the parent company said lower demand from the computer sector was part of the reason why it failed during the first two months of this year to keep up with profits generated during the same period in 1997.

The fall-out from the world electronics slump was harsher at Viasystems, whose PCB manufacturing facility neighbours the Signum site in the Borders.

It announced last week that 210 of its employees would be made redundant.

In its statement yesterday, Prestwick said it would make an unspecified number of staff cuts among its Ayr workforce

With market conditions not expected to improve in the next three months, the company has also initiated a cost containment programme and is delaying any further capital investments.

''We believe that the entire sector is suffering from the severe market conditions,'' chief executive Pat Moore said.

''As Prestwick has recently acquired significant new customers, we expect to benefit quickly from any upturn in the market or further strengthening of Continental currencies against sterling.''

In the Borders, the developments at Signum and Viasystems have served to deepen concerns about job security in the area.

Roxburgh and Berwickshire MP Archy Kirkwood yesterday highlighted the plight of the region - hit by problems in knitwear, agriculture and now electronics - in an adjournment debate of the Scottish Grand Committee.

Signum, formerly known as Met-Etch, was taken over two years ago by managing director Guido Crolla.

Forty staff were made redundant earlier this year, leaving a workforce of around 140 people.

Signum has in the past taken on subcontracted work from American-owned Viasystems, although this has diminished with the recent inclusion in the Viasystems European empire of the ISL production plant on Tyneside.