Summary of 945 Series
Page 2
Notice important safety information risk of electric shock do not open warning: to prevent fire or shock hazard, do not expose this equipment to rain or moisture. T h e l i g h t n i n g f l a s h w i t h a r r o w h e a d s y m b o l w i t h i n a n e q u i l a t e r a l t r i a n g l e i s i n t e...
Page 3
12. Cleaning the equipment should be cleaned only as detailed in the operating instructions. 13. Object and liquid entry care should be taken so that objects and/or liquids, such as cleaning fluids or beverages, are not spilled into the enclosure of the equipment. 14. Damage requiring service hafler...
Page 4
Table of contents performance specifications ............................................................................................... 4 general information .................................................................................................................. 5 installation rackmou...
Page 5
Performance specifications line amplifier (measured at l i n e o u t ) headphone amplifier tuner section-fm tuner section-am general information all specifications are for 20 hz 20 khz unless specified otherwise. Frequency response: db (into 33,000 ohms) bandwidth: 10 hz - 150 khz, -3 db, into 1 ok ...
Page 6
Remote controls: up/down volume, up/down tuning, preset next, preset ‘1 ‘, preset ‘11’: audio/ video input selectors, tape 1, tape 2/epl, power, am/fm selector, tone in, mute. Convenience outlets: 120 vac models: 1 polarized unswitched, 2 polarized switched, 1 grounded switched 240 vac models: 1 rev...
Page 7
1 6 1 5 1 6 1 5 1 4 1 4 945 preamp/tuner front panel view.
Page 8
Front panel call-outs 1. Power switch 15. -lights amber when in ready mode. -lights green when in on mode. 2. 3. Infrared receiver window memory presets (l-9) -press to store am/fm stations l-9 into memory. (see -press to recall am/fm stations l-9 from memory. 16. Auto/manual -press to change betwee...
Page 9
Left channel video record tape 1 a / v i n video in switched ac line voltage line out outlets rating out in 3 2 1 3 1 antenna bracket right channel a / v o u t t a p e f m a n t 3 0 0 o h m i l i n e c o r d outlet connector 945 preamp /tuner rear panel view 120 vac version.
Page 10
Channel video record tape 1 a / v i n video in line out switched ac line voltage outlets rating out in 3 2 1 3 2 1 r i g h t channel i i a / v o u t cd fm ant line cord t a p e outlet connector 3 0 0 o h m 945 rear panel view 240 vac version.
Page 11: Preamp /tuner Remote Control
Preamp /tuner remote control 1. Volume -press left volume button for decreased volume. -press right volume button for increased volume. -pressing either volume button defeats mute. 2. Tune -press left button to change tuner down in frequency. -press right button to change tuner up in frequency. -ope...
Page 12: 945
L - - - - - - - - - - - - , - - - - - - - , i c m o s 945 functional block diagram one channel shown.
Page 13
Antenna connections initial power- up/muting system audio line level inputs audio line level outputs video switching a simple "t" shaped dipole ribbon antenna has been provided for fm reception. Connect its leads to the rear panel terminals marked “fm 300 ohm”. For best results, the “arms” of this a...
Page 14
Tape inputs and tape o u t p u t s the 945 incorporates two tape loops for use with audio tape decks or other input/output signal processors. Due to the great flexibility of connection and control, the tape loops are probably the most complicated portion of the 945 to understand and operate. Therefo...
Page 15
Mute control volume control and volume control indicator balance control mono control headphone output the headphone receptacle is a standard 1/4” stereo phone jack, with the tip of the plug as the left channel, the ring the right channel, and the barrel ground. Am/fm selector activating the tone co...
Page 16
Up/down tuning and auto selector memory presets l-9 and +10 preset shift (front panel) memory preset buttons '1', ‘1 1', and next (remote control) storing stations into memory mono control pressing the left tuning button will change the station frequency down the band. Pressing the right button will...
Page 17: Circuit Description
Circuit description remote receiver and control logic audio line level input selector system jfet buffer and record output driver video switching tape monltor switching line amplifier tone control system muting system the remote receiver circuitry decodes the infrared pulses received from the remote...
Page 18
Headphone amplifier am/fm tuner the headphone amplifier utilizes a separate special purpose operational amplifier to drive the high current demands of headphone operation. This provides the extra power necessary for driving difficult headphone loads, and leaves the main signal path uncompromised for...
Page 19
Fm antenna warning: the use of ground adaptors (with the ground tab or wire of the adaptor disconnected) will eliminate the safety feature of the grounded power cord. This safety feature is intended to reduce the risk of electric shock-should an internal fault in the equipment result in an electrica...
Page 20
Am antenna remote control battery replacement cleaning/ maintenance the loop antenna supplied will offer excellent reception in most situations. It is a directional antenna, requiring orientation perpendicular to the radio station’s transmitter. Because of its directional behavior, it will offer the...