Zenith D952X - Page 50

NOTE - A TEMPORARY GROUND WIRE MUST BE CON 
NECTED BETWEEN THE INPUT SHIELD AND THE NEGATIVE
TERMINAL OF C505 WHEN SERVICING CHASSIS 25WDA10 (IF
DISCONNECTED FROM CHASSIS 5WDR50X AND SWITCHING
NETWORK).
NOTES
ALL RESISTORS IN OHMS, ±IO%, I/2 WATT CARBON
UNLESS OTHERWISE SPECIFIED.
ALL CAPACITORS IN MICROFARADS ±IO%
UNLESS OTHERWISE SPECIFIED.
r INDICATES ±20%.
ALL VOLTAGES ARE D.G. UNLESS OTHERWISE SPECIFIED.
DC. VOLTAGES ARE MEASURED FROM CHASSIS WITH
NO SIGNAL AND LOUDNESS CONTROL AT MINIMUM
USING A HIGH INPUT IMPEDANCE V.T.V.M. LINE VOLTAGE I20V.A.C.
REPEAT ABOVE ADJUSTMENT FOR TEST POINT AB-AC AND ADJUST R426
FOR .01 OV TO .015V.
BIAS TEST POINTS: (AB) , (AC) , ( ad ), (AE)
** TO ADJUST BIAS CONNECT A DIGITAL VOLTMETER
OR ACCURATE LOW RANGE VOLTMETER ACROSS TEST POINTS
AD-AE AND ADJUST R476 FOR .OIOV TO ,015V.
AUDIO OUTPUT TRANSISTORS Q403 TO Q408 (RIGHT CHANNEL )
AND Q453 TO Q458 (LEFT CHANNEL) INCLUSIVE IN EACH GROUP
SHOULD BE TESTED BEFORE REPLACEMENT TRANSISTORS
ARE INSTALLED.
----- INDICATES VOLTAGE SOURCE.
OUTPUT DEVICES MUST BE USED AS PAIRS FROM THE SAME
MANUFACTURER IN EACH CHANNEL.
~f~ DENOTES CHASSIS GROUND.
48
CHASSIS 25WDA10 - SCHEMATIC