Teac A-7300 - TROUBLESHOOTING

id i PAN Os A-7300/2
TROUBLESHOOTING
se Scan REO
Ae S i oo ee QSSIBLE SOURCE OF TROUBL
- Pilot Lamps (in VU Meters) do not
illuminate when power is applied...........cee cence Fuse F701 (2A) burned out
- Fuse burns out (blows) when power is applied.......Defective Power transformer (T151)
~ Capstan will not rotate..........6.. ei bcar'enwtenoteuereveveceyege Specified 24V DC present on the CAPSTAN
MOTOR ASS'Y J152 Pins #1~7
Leeeecnive CAPSTAN ASS'Y
Specified 24V DC not present on the
STABILIZER UNIT J21 Pins #11,#12
Lonagentive STABILIZER UNIT ASS'Y or
Connector loose
Specified 32V DC not present on the
STABILIZER UNIT J21 Pins #13,#14
Ljebeceree D1O~D13 or Power transformer (T151)
- Transport inoperative in Forward Playback.......... Faulty Safety switch (SW155)
- Pinch roller fails to engage completely............ Voltage present on the CAP SOL.1
terminals
L cap SOL.1 Disconnected
High-Level voltage (approx.3V) present on
the SOLENOID DRIVE UNIT J121 Pin #3
Lnefective Q121 or Q122
High-Level output voltage not present on the
CONTROL UNIT P41 Pin #1
Lnefective CONTROL UNIT
- Right Reel Motor does not rotate.............+....-.Fast Forward OK........Defective Q71 or K72
High-Level output voltage not present
on the CONTROL UNIT P41 Pins #1 or #2
gepcekive CONTROL UNIT
pe
High-Level output voltage present on
the REEL MOTOR DRIVE UNIT at H terminal
i: Defective Reel Motor
- Neither Reel Motor rotates...... ee emcee eer ceeeeeee Brakes not dis-engaged
Lpiseonneeted brake Solenoid R or L,
Defective Q125 or Q126
High-Level output voltage present on the
SOLENOID DRIVE UNIT J21 Pin #8
Lpefacetyva SOLENOID DRIVE UNIT
High-Level output voltage not present on
the CONTROL UNIT P41 Pin #2
lnetective CONTROL UNIT
- Fast Forward or Rewind modes
inoperative (Playback is OK)........... Hapathe Diag ..High-Level output voltage not present on
the CONTROL UNIT P41 Pins #4,#7
lperedtive CONTROL UNIT
High-Level output voltage present on the
CONTROL UNIT P41 Pin #2
linefective SOLENOID DRIVE UNIT (Q125,Q126)
14