Stewart-Warner-Corp-9002-B 电路原理图.pdf

《Stewart-Warner-Corp-9002-B 电路原理图.pdf》由会员分享，可在线阅读，更多相关《Stewart-Warner-Corp-9002-B 电路原理图.pdf（4页珍藏版）》请在收音机爱好者资料库上搜索。

1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS . 5 OrTTW ZS PT_W a ptsttp 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS STEWART-WARNER MODELS 9002-A, B, P, R Remove chassis and loop antenna from cabinet. Reconnect loop to chassis and space it approximately same distance from cha

2、ssis as | when installed in cabinet. Note that there are four calibrating lines stamped into the metal dial frame. When gang condenser is fully meshed, dial pointer should be in the position indicated by first line at the left. If it is set incorrectly, release pointer clip on dial cord and repositi

3、on pointer. Connect an output meter across the speaker voice coil or from plate of 35L6GT tube to B through a .1 Mfd. condenser (see voltage chart for convenient B connection). Connect ground lead from signal generator to B through a .25 Mfd. condenser. Set volume control at maximum volume position

4、and use a weak signal from the signal generator. -APPROXIMATE STAGE GAIN DATA- A vacuum tube voltmeter may be used a tuned and calibrated R.F. amplifier. for audio gain measurements. R.F. gains can be measured with a channel type instrument containing Observe following precautions: 2. For R.F. and I

5、.F. measurements connect negative terminal of a 3 volt battery (two 11/2 volt cells in series) to A.V.C. lead and positive terminal to B. This provides a definite operating point. IMPORTANT: Disconnect battery when measuring audio stage gains. 1. For all gain measurements connect signal generator as

6、 shown. Use 600 KC. signal with 400 cycle modulation (use nearby frequency if local station interferes.) The R.F. and I.F stage gains shown below are less than under normal operating conditions due to the use of 3 volts fixed bias in order to establish a definite operating point. Therefore, these va

7、lues are not intended to indicate the full capability of a stage. 3. Be sure radio is carefully tuned to gen erator signal (use weak sig nal for sharp tuning.) 4. When using a chan nel type instrument carefully tune it for maximum output at desired frequency be fore making measure ments. DUMMY ANT.

8、IN SERIES WITH SIGNAL GENERATOR CONNECTION OF SIG. GENERATOR OUTPUT TO RECEIVER SIGNAL GENERATOR FREQUENCY RECEIVER DIAL SETTING TRIMMER NUMBER TRIMMER DESCRIPTION TYPE OF ADJUSTMENT 200 MMFD. Mica Condenser Control Grid of 12SA7 455 KC Any point where it does not affect the signal 1-2 2nd I.F. Adju

9、st for maximum output. Then repeat adjustment. 3-4 1st I.F. 200 MMFD. Mica Condenser External Antenna Clip on Loop Frame 1500 KC Set pointer to 1500 KC reference line stamped into metal dial plate (first line at the right) 5 Broadcast Oscillator (Shunt) Adjust for maximum output. 200 MMFD. Mica Condenser l External Antenna Clip on Loop Frame 1500 KC Tune to 1500 KC generator signal 6 Broadcast R.F. Adjust for maximum output. Adjust for maximum output. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN