SWITCH ON/OFF FAILURE
OSCILLATOR -4V REFERENCE
OUT OF RANGE (-4.1 to -3.9 VOLTS)
RF OUTPUT CHECK (>24 HOURS OF POWER UP)
CAN’T ADJ. TO RANGE (0.87 TO 0.97V P-P)
LEVEL CHANGES AT A STEADY LOW RATE*
LEVEL CHANGES AFTER SOME PERIOD (<1HR)
FREQ. WORD OUT OF RANGE (<0800 OR >3800)
FREQUENCY PHASE-LOCK WORD
PHASE LOCK FAILURE (CONTACT PECC OR NESAC)**
CAN’T PHASE LOCK
FREQUENCY TRACKING (CONTACT PECC OR NESAC)**
FAILING BITS
OSCILLATOR ENABLE/DISABLE SWITCH
REMOVE 39B OSCILLATOR
**PECC OR NESAC MUST BE CONTACTED BEFORE OSC. IS RETURNED FOR REPAIR
OTHER (EXPLAIN)
BENCH TEST
IN FRAME PRESERVICE CHECK
IN FRAME SERVICE FAILURE
-24V CURRENT DRAIN (SKIP INITIAL CHECK IF IN SERVICE)
INITIAL CURRENT 1.5 TO 2.7 AMPS)
AFTER WARM-UP (0.5 TO 1.2 AMPS)
FAILING BITS
FAILING BITS
39B OSCILLATOR TROUBLE FORM
SERIAL NUMBER
OFFICE CLLI
MODE OF FAILURE
BITS
HEX
V
A
A
BITS
BITS
*IF TESTED IN FRAME, OSC, MUST BE PHASE LOCKED
LEVEL CHANGES >.2V P-P DURING FREQ. ADJ
FULL FREQ. RANGE CHECK
FREQ. HI/LO BIT CHECK
Figure 1 — Example — 39B Oscillator Trouble Form
DLP
234-151-013
537
DEC 1995
Issue 8
PAGE 2 of 4
