Galvin-Mfg-Co（Motorola）-11MX 电路原理图.pdf

《Galvin-Mfg-Co（Motorola）-11MX 电路原理图.pdf》由会员分享，可在线阅读，更多相关《Galvin-Mfg-Co（Motorola）-11MX 电路原理图.pdf（1页珍藏版）》请在收音机爱好者资料库上搜索。

1、12AD6 12BL6 12F8 4450, MN53.0R 2N652 2N176 CONV IF AMP DET-AVC-AF AMP DRIVER R17 2.2M PWR AMP OFTEN-NEEDED 1962 RADIO SERVICING INFORMATION KHi- 7 15SI * I I W MOTOROLA MODEL I1MX to- is |3, W2Y88I1 | t-VWWW loIUlO I1 rMsf O I-1 sS 1001 98 L_ JLLJ “| WOI VH -Mj Nap 4#- _J Tn L SERVICE NOTES 1. RADIO

2、 POLARITY - WHEN SERVICING THIS RECEIV- ER, THE “A” LEAD MUST BE CONNECTED TO THE POS ITIVE SIDE OF THE POWER SOURCE. IF CONNECTED OTHERWISE, RECEIVER WILL NOT OPERATE AND DAM AGE TO COMPONENTS MAY RESULT. 2. POWER SUPPLY REQUIREMENTS - It is preferable to use a storage battery (without a battery ch

3、arger) in place of a battery eliminator. If a battery eliminator is used, it must be well regulated and filtered. 3. POWER TRANSISTOR REPLACEMENT - When replacing a power transistor, be sure transistor insulator is in place and well greased and that the mounting screws are securely and evenly tighte

4、ned. Use only the transistor specified in the Replacement Parts List for replacement. See Notes 4 & 6. 4. POWER TRANSISTOR INSULATOR - When replacing a power transistor or power transistor insulator, be sure to coat both sides of insulator with DC-4 grease (Motorola Part No. 11M490487) to insure pro

5、per heat dissipation. 5. DRIVER TRANSISTOR REPLACEMENT - When.replacing a driver transistor, grasp the transistor leads (between the transistor body and soldering lug) with a pair of long nose pliers to prevent excessive heating of transistor body during soldering operation. 6. POWER TRANSISTOR CURR

6、ENT ADJUSTMENT - After a power transistor has been replaced, the collector current should be checked and adjusted for proper operation. a. Insert a low range (0-1 or 0-2 amp) DC ammeter in the primary ground return lead of the output transform er (T4). Connect the negative post of the meter to groun

7、d. CAUTION: Be sure the speaker ground lead is connected in common with the transformer ground lead to the posi tive meter terminal (see schematic). b. Turn the radio on and allow it to heat up for about 15 minutes. c. Adjust R18 for a reading of 360 ma with 12.6 volts in put to the radio “A” lead. NOTE: Two values of radio input voltage are given as a convenience to service personnel in order to accomodate different power sources. The current value stated on the Schematic Diagram is for 14 volts input to the radio A* lead. 48 收音机爱 好者资料库 RadioFans.CN