Roberts 192 FT Service Manual

Page 1

FRtrOUENCY RESPONSE: 40 to 15,000 cps at ? l/2tps *2 db; 40 to 9,b00 cps at 3 3/4 ips + 3 db. SIGNAL- TO. NOIS E RATIO: 55 db below recorded "0" Ievel. WOW AND FLUTTER: Les s than 0. 1B7o rms. HEADS: FuIl-track erase and record/playback in shielded housing. SPECIFICATIONS PREPA RING FOR OPERATION OUTPUT: 6 watts undistorted. REEL SIZE: ?" maximum (up to 2400 ft. of tape). POWER REQI]IREMENTS: 95 to 120 volts AC, 60 cvcles, 50 watts. SIZE: 15 3/4" xt4 t/2" xI t/2". WEIGHT: Approx. 28 lbs. l. t Remove lid from carrying Remove microphone and storage compartment on case. case. AC supply cord from left side of earrying 3. Make certain all controls are in ttre neutral po- sition. FUNCTION OF CONTROLS 0n-Off Switch When the switch is pushed to the All-On posi- tion, power isturned onto theamplilier and tapedeck. When the switch isin the Amp-Off position, power is applied to the tape deck only. The Of{ position turns the power off to the entire unit. Volume Turning this control elockwise increases the volume during playback and the recording level when recording. Tone This control functions in playback only. Turn- ing theeontrol clockwise increases thehigh frequency responae and turning the control counterclockwise attenuates the high frequency response. PIay-Record and Record Lock This is a 3-position eontrol: Stop, Piay, and Record. Turning this control elocknrise from the Stop position, places the unit in play. Depressing the Record Lock and turning the control to the Record position at the same time, places the unit in Record" N0TE: This control is interlocked with the Rewind-Forward control. It must be in the Stop position before the Rewind-For- ward control can be operated. Rewind-Forward Turning this control to the left places the unit in the Rewind model to the right places the unit in Forward mode of operation. NOTE: This control is interlocked with the Play-Record control. It must be in the Stop position before the play-Record con- trol can be operated. Pause When this lever is raised, pressure is removed from the eapstan, and the take-up reel is disengaged. This permits spot editing and momentary stops. PAGE 2

Page 2

.:, {?'ttf i () Fig. l. TopVieur of Tape Transport Mechanism. O PERATI NG I NSTRUCTIONS 3 Op E9'tr tp sdtt{ Threading the Tape 1. Place a full reel of tape on the supply reel spin- dle (27), making certain the reel slots engage the protrusions on the pan. Place an empty reel on the take-up spindle (67), again makingcertain the slots engage the protrusions on the pan. 2. Unwind about 14 inches of tape from the supply reel. HoId a section of tape taut and insert into the tape slot, making sure the dtrll-coated side faces the rear of the recorder. 3. Insert the free end of the tape into one of the slots in thehub of the take-up reel. While hold- ing the end in place, rotate the reel to secure the tape and take up any slack. To Make a Recording I. PIug a microphone into the Microphone jack. Place the High Z iiltric- Low Z Mic switch in the proper position to match the impedance of the microphone. 2. Plaee the Pause lever in the Up positionl de- press the Record Loek button and at the same time rotate the Play-Record control to the Record position. 3. Preset therecording level by adjusting the Vol- ume control until the indicator goes up to the red portion of the scale but does not enter the red portion except on loud passages. CAUTION: Do not eonnect a speaker or other low impedance load to the Output jack while making a recording. To Play Back a Tape 1. Thread the tape as described under "Threading the Tape". 2. Turn the unit on and allow a few seconds for it to warm up. 3. Turn the Play-Record control to play. 4. Adjust the volume and tone to the desired list- ening level. Speed Change To change the tape speed from 7 L/ Z to B B/ 4 ips, remove the thumbscrew and bushing from the capstan. When the bushing is not being used, store it on the bushing post. lndex Counter Aftera tape is threadedon the recorder, set the index counter to "000". The index numbers ean then atoF(fm7 J(lr PAGE 3