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PSU OUTPUT VOLTAGES
On-site maintenance of the Response range is limited as the equipment
contains no serviceable parts. Some routine servicing - detailed in the User
Guide should be carried out by the customer, but field maintenance is restricted
to checking the facility switch settings and testing the power unit output.
Several adapters used with Response instruments are marked with lower outputs
than those actually measured. Approximate voltage readings (with the output open
circuit) are as follows:-
Transformer 19B (marked 13.5V DC) measures 19 - 20v.
Transformer 752 (marked 9V AC) measures 11 - 12v.
Transformer 753 (marked 9.5V DC) measures 13 - 14v.
ACTION BEFORE CHANGEOUT (July 1994)
It has been reported that a large quantity of the Response range of TARMs have been returned as faulty without being fully reset and retried. Some faults are caused
by quick line disconnects and Radio Frequency Interference and may be cleared by a reset.
Models such as the Response 200, 300, 400, 500 & 1000 have all got a reset button on the underside of the unit. Depressing this button momentarily, using a small probe, will perform a slightly different reset to that performed when the mains is turned off/on. It is suggested that this is performed first, then retry all facilities, before changing out the unit.
However, if after changing the unit the same fault recurs on the new unit, the problem may be site specific and changing the unit again will be of no advantage. If this is the case, please contact the Technical Helpdesk for further advise.
RESPONSE RANGE: NOT CLEARING AFTER CALL (July 1994)
A major problem with Response TARMs recording after a message has been left has been caused by the exchange equipment presenting ‘clicks’ on the line when it is idle. This is due to a modified line card on System X exchanges. BT Labs are
aware of the problem and are investigating a cure. Changing the unit will not clear this problem.