Galvin-Mfg-Co（Motorola）-53C1 电路原理图.pdf

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1、CONNECTIONS CONNECTIONS (BOTTOM VIEW) (BOTTOM VIE V 收音机爱 好者资料库 RadioFans.CN MANUAL OF 19S4 MOST-OFTEN-NEEDED RADIO DIAGRAMS _ _ - | u _ 2. WHEN REMOVING DEFECTIVE COMPONENTS, USE MOTOROLA, IWL. MODELS bOUl ONLY A SMALL SOLDERING IRON (60 WATTS OR LESS) -M. TO AVOID DAMAGE TO THE WIRING. DO NOT USE A

2、 (Continued from ruACCK 53CZ soldering gun. warning: the leads are very V IAiJIJ THIN, AND EXCESSIVE HEAT WILL BURN THEM OR preceding page.) HS-366 S3S3 loosen them from the base material. SAFETY PRECAUTIONS S3C4 3. Plated connections or leads, if damaged, may be re- 1. The chassis of this receiver

3、is connected directly to the power line. However, the power cord circuit is broken by an interlockwhen the cabinet back is removed for replacing tubes. When aligning Or servicing the chassis from AC, an isolation transformer should be inserted between the power line and the chassis. 2. Do not servic

4、e the chassis on a metal plate, because of the possibility of a short circuit. 3. Use caution when handling the chassis with power ap plied, because all high voltage leads are exposed. 4. The outer edges of the chassis and the large plated areas in the center are at ground potential. 2. WHEN REMOVIN

5、G DEFECTIVE COMPONENTS, USE ONLY A SMALL SOLDERING IRON (60 WATTS OR LESS) TO AVOID DAMAGE TO THE WIRING. DO NOT USE A SOLDERING GUN. WARNING: THE LEADS ARE VERY THIN, AND EXCESSIVE HEAT WILL BURN THEM OR LOOSEN THEM FROM THE BASE MATERIAL. 3. Plated connections or leads, if damaged, may be re place

6、d with a jumper of regular hook-up wire. 4. It is recommended that IF transformers, tuning capaci tor, volume control, oscillator coil, or the electrolytic ca pacitor be removed by immersing all the lugs simultaneously into a small soldering pot. The component may then be lifted off the chassis easi

7、ly. If a soldering pot is not avail able, heat each lug individually with a small soldering iron, and shake off as much molten solder as possible. Then, by alternately heating and loosening each lug, the entire com ponent will be freed. The disadvantage of using a soldering iron instead of a solderi

8、ng pot is that the plated connections may be pulled loose from the chassis. 5. An individual tuhe clip may be removed by squeezing it with pliers and then unsoldering it. The new clip snaps into the hole. COMPONENT REPLACEMENT 1. To prevent tube breakage, remove them before replac ing components. CA

9、UTION: Remove the tubes only by pull ing them straight out. Wiggling a tube may bend a socket clip, causing poor contact with the tube pin. 6. Resistors or capacitors may be removed hy unsoldering one end at a time. DUMMY STEP ANTENNA IF ALIGNMENT 1. I . 1 mf RF ALIGNMENT 2. I .1 mf inly by pull- CA

10、UTION: .Clean all the solder from the holes before in- snd a socket stalling a new component. Do not let the solder run onto an adjacent lead, as a short circuit will be Created. ALIGNMENT CHART GENERATOR CONNECTION Grid of conv. (pin 7. 12BE6) Grid of conv. (pin 7, 12BE6) Radiation loop* GENERATOR

11、FREQUENCY GANG SETTING 1, 2, 3, It 4 (IF cores) 5 (Osc) REMARKS Adjust for maximum. Adjust for maximum. Adjust for maximum. Connect generator output across 5 diameter, 5 turn loop and couple inductively to receiver loop. Keep loops at least 12 apart. OUTPUT TRANS B+CONN- ,eT IC LOOP CONV GRID- CONN LOOP, RETURN CONN Vw , (convj|2BE6 _ (rect) _=|2BA6 1ST IF 455KC ($) PRI (TOP) SEC (BOT) ANT 1400 KC OSC 1620 KC (IT TUNING CAP I2BA6 l AMP J 35W4 50C5 OUTPUT TRANS PLATE CONN 2ND IF 455 KC PRI (TOP) I2AT6 SEC (BOT) 收音机爱 好者资料库 RadioFans.CN