AT&T Bell System Plant Series Adjustment Procedure page 6

SECTION 034-368-701
TRANSFORMER
SHIELD (Tl)
SUPPLY REEL
TACHOMETER
READ/WRITE
HEAD CABLE
CONNECTOR
ASSEMBLY
CAPSTAN
DRIVE ASSEMBLY
ELAPSED
TIME METER ------~
Jl2
Jl3
INTERFACE ASSY
RU.DY
Fl
.(,
SUPPLY REEL
SERVO MOTOR
REEL BRAKE
VACUUM
BLOWER UNIT
MUFFLER
1
LATCH (2)
,
.
•
----MUFFLER
--VACUUM UNIT
FILTER
• (NOT SHOWN)
VACUUM UNIT
POWER
CONNECTOR
VACUUM
INTERLOCK
SWITCHES
REEL BRAKE
Fig. 4-Tape Transport-Rear View
TABLE B
REEL BRAKE TENSION
TENSION (GRAMS)
TYPE OF REEL
MIN NOM
Take-Up Reel 350 375
Supply Reel
325 350
Page 6
MAX
425
400
potentiometer R23 regulates -12 volts. These
voltages, measured at TP2 as described in (a) and
(b), shall be within the following limits.
+12 volts ±1.0% (+11.88 to +12.12)
-12 volts ±1.0~o (-11.88 to -12.12)
Using the volt-ohm-milliammeter, check the
requirements as follows.