Galvin-Mfg-Co（Motorola）-ST-56 电路原理图.pdf

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1、Solenoid Tuners ST-66 (ST-66 - CRe, ST-66 - FDe etc.,) are used in 1946 and 1947 Motorola automatic tuning specific auto re:- celvers. Fundamentally, all ST-66 tuners are the same except for the manual tuning shaft, dial cord pulleys and pushbutton switch lead lengths. These variations are brought a

2、bout by mechani cal differences between the specific receivers In which this tuner Is used. The receiver model number Is Included In the tuner model number to Identify which specific receiver the tuner will f it, l.e., ST-66-CR7. ST-66-BK6 etc. This Is a 3 gang permeability type tuner operated by a

3、adenoid. Five pre-set and one manual tuning posltlona are provided. The frequency range Is 636 to 1600 Ec. The pre set positions can be set to any frequency within this r If It trips too late, the plunger may hammer violently or should the solenoid switch fall to trip, the plunger would be held with

4、in the solenoid. PUSH CARRIAGE PLATE / FORWARD SLOWLY TOWARD ( COIL SHIELD PLATE BY I HAND. COIL SHIELD U . PLATE - 11 SOLENOID SWITCH SHOULD SNAP OVER WHEN CARRIAGE PLATE IS 1/8” FROM COIL SHIELD PLATE The gear lever latch holds the station set-up gear train in position while setting up stations. F

5、ailure of the latch to engage pro perly when the set-up button Is pushed in or the station set-up knob Is turned (whichever Is applicable) would result in the inability to set up pre-set stations. Failure of the latch to disengage after station is set up would result In faulty automatic tuning be ca

6、use the lead screws might not seat them selves properly against the tuner end plate- Flgure 7 above shows the latch detail and ad justment. fO, h SET-UP BUTTON IV- SHOWN PUSHING IN GEAR LEVER. t OR -GEAR LEVER j CAM MECHANISM SHOWN PUSHING IN GEAR LEVER. ACTUATED BY STATION SET UP LEVER. DETENT LEVE

7、R- BEND LEVER AT THIS, POINT TO ADJUST. CARRIAGE PLATE WHEN SET-UP BUTTON IS PUSHED IN, DETENT LEVER SHOULO LATCH GEAR LEVER AS SHOWN. CARRIAGE. BRACKET ADJUSTMENT “ SCREW l DET. N. 69B4718D2 RAISE0 PORTION OF END PLATE. -GEAR LEVER BOTTOM VIEW 120 IF;THE adjustment tSTlOT CORRECT LOOSEN THIS SCREW

8、AND MOVE CARRIAGE BRACKET TO CORRECT IT. DETENT LEVER- BEND LEVER AT .|N_ I BKAbKt I IU WlfKtCI I THIS POINT TO- FIGURE 6. | it. _| adjust. SOLENOID SWITCH ADJUSTMENT FIGURE 7. GEAR LEVER LATCH ADJUSTMENT WHEN PLUNGER IS FULLY IN SOLENOID, CARRIAGE PLATE SHOULD DEPRESS DETENT LEVER AND RELEASE GEAR

9、LEVER AS SHOWN. MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS SERVICE NOTES FAILURE OF SOME LEAO SCREW TO ENGAGE IN SET-UP GEARS If some of the lead screws fall to engage In the set-up gears during station setting up procedure, check the gear lever to see If It is bent. When the set-up button Is p

10、ushed in and the gear lever latches on the detent lever, the set-up gear train should be parallel with the tuner end plate and the bottom of the gear train should be resting on the raised portions of the tuner end plate. LUBRICATION Should lubrication ever be required. It Is recommended that a very

11、f lne grease, com mercially called Lubrlplate, or Its equivalent, be used. Remove all old and sticky lubricant with a solvent such as carbon tetrachloride and then, very sparingly, lubricate only the following points: 1. Carriage guide rods. 2. Actuator rod. 3. Manual lead screw. Do not lubricate ,o

12、r permit lubricant to get on Selector Switch contacts. The friction drag Is required for proper operation of tuner. LEAD DRESSING Make sure that the selector switch and solenoid coll leads are dressed so that carriage plate does not rub against them. Leads rubbing against the carriage plate may caus

13、e the tuner to stick, especially at the high frequency end. REPLACEMENT OF SOLENOID COIL OR SOLENOID PLUNGER Should replacement of the solenoid coll or solenoid plunger be required. It will be necessary to replace the entire tuner. A close fltbetween solenoid plunger and solenoid coll form Is requir

14、ed; a proper match can only be secured at the factory. When service of thla kind Is required, return the tuner to the factory for exchange. TO REPLACE ANT. R.F., OROSC. COILS IMPORTANT: When ordering replacement colls, order by part number and also specify the color coding (paint dots) on old coll.

15、THE REPLACE MENT COIL SHOULD CARRT THE SAME COLOR CODING AS THE ORIGINAL OR . -THE TUNER WILL NOT TRACK PROPERLY. 1. If coll Is not readily accessible remove the tuner from the chassis as outlined under TO REMOVE TUNER FROM CHASSIS. 2. unsolder the two lugs holding the coll to the tuner plate. 3. Ca

16、refully remove the old coll. Save the thin paper washer that Is found at the base of the coll. 4. Slip the paper washer over the replacement coll and slip coll Into shield can. 5. Orient coll so Its lugs are m same posi tion as before and resolder to tuner plate. 6. Reassemble tuner and Install in r

17、eceiver. 7. Realign ANT., R.F. and OSC. stages per In structions found in the receiver service manu al. TO REPLACE ANT. R.F. OR OSC COIL TUNING CORES 1. The core which tunes the top coll Is readily accessible and presents no re placement problem. To reach the two bottom coll tuning cores, remove the

18、 tuner from the chassis base as outlined under TO REMOVE TUNER FROM CHASSIS. 2. Remove the carriage return spring. 3. Move the carriage plate back as far as It can go. The tuning cores can now be screwed out* or In by grasping the por tion that sticks out the back of the coll. When Installing a new

19、core, make sure that the Insulating washer and adjustment clip are replaced properly. The Insulating washer goes on the core side; the core ad justment clip has an ear on It and this ear must fit Into a hole in the bakellte Insulator on the carriage plate. Refer to Figure 8. 4. Replace the carriage return spring. 5. Install tuner In receiver. 6. Realign ANT., R.F. and OSC. stages follow ing the instructions found In the receiver service manual. (Motorola Tuner ST-56) 121