United-Motors-Service-Delco-988976 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION I2DZ6 R.F. AMR I2AD6 OSC.-MOD. PONTIAC MODEL 988976 (Additional material on next page at right) I2DS7 DET.-AUD. voltages measured terminal TO CHASSIS WITH A VTVM - ND SIGNAL AND 12.D VOLTS AT ILLUS. 32 OSCILLATOR GRID VOLTAGE Taken with

2、 set tuned to IDDDKC. TOTAL A” DRAIN AT 12V.- 2.1 AMPS. TOLERANCE ON VOLTAGES i|D7, *-INDICATES LEAD FROM TUNER COIL ASSY. -BEFORE MEASURING TRANSISTOR 5- voltages,the Shorting type SPEAKER SOCKET MUST BE OPEN ED AND A 4 OHM SPEAKER CON NECTED. IF TRANSISTOR IS RE PLACE, ADJUST BIAS POTENTIO METER (

3、ILLUS. 68) TO OBTAIN PROPER COLLECTOR VOLTAGE WITH 12 VOLTS INPUT TO RADIO. 5L ant. a to RELAY hEaTERS 16o f - ILLUS. 60 IS A FUSE RESISTOR u 1000 SWITCH FOR THE transistor. ONTIAC 988976PRINTED CIRCUIT SHOWN IN HEAVY LINES. 7! jSLUE IIC *L -OUTPUT TRANSISTOR WILL APPEAR SHORTED IF SHORTING TYPE spe

4、aker SWITCH IS NOT HELD OPEN- ALIGNMENT PROCEDURE: SERIES CAPACITOR TO DUMMY ANTENNA 0.000068 Mfd. 0.000068 Mfd. 0.000068 Mfd. 0.000068 Mfd. SIGNAL GENERATOR _TO_ 12AD6Grid(Pin#7) Antenna Connector Antenna Connector Antenna Connector Antenna Connector GENERATOR FREQUENCY 1615 KC 1615 KC TUNE RECEIVE

5、R TO High Frequency Stop High Frequency Stop Signal Generator Signal High Frequency Stop j Signal Generator Signal ADJUST IN SEQUENCE FOR MAX. OUTPUT A, B, C, D *E, F, G Before making this adjustment check mechanical setting of oscillator core “H.” The rear Df the core should be 1% from the mounting

6、 end Df the coil form. (This measurement is readily made by inserting a suitable plug in the mounting end Df the CDil form.) Core adjustment should be made with a nDn-metallic screwdriver. *L is the pointer adjustment which is on the connecting link, between the pointer assembly and core guide bar (See tuner Dwg.). It should be adjusted so that when looking directly at the dial the pointer is Dn the 1100 KC mark. This setting is tD give the correct relationship between the pointer and the dial when the radio is install ed in a car. 26 收音机爱 好者资料库 RadioFans.CN 27 收音机爱 好者资料库 RadioFans.CN