Teac A-5500 - Page 45

~~ MALFUNCE-ION--~
13-3. TROUBLESHOOTING
- | POSSIBLE SOURCE-OF TROUBLE--| CORRECTIVE PROGEDURE--
Will not record
a.
Specified signal not
present at Mixing Ampl.
PC Bd, Pins 3,12
a. Isolate, repair defective
components by signal
-trace to this point
Q509, DZ501, or associated
: i i it on the .
: seta aie PC Bd acti- Dei Deets 10207 9<05085
vated by malfunction
parts
Will not erase a. Bias Oscillator circuit |a. Transistor Q553 or relay
relay K551 not activated K551 defective
b. Specified High Level not]b. Repair defective circuit
present on Control Drive
unit J41 pin #2
c. Correct voltage of 23V c. Replace transistors Q551
at transistors Q551 and and Q552 as a pair
Q552 but no oscillations
d. Erase head defective d. Check connections,
or disconnected
replace
Auto~treverse or
Auto-repeat does
not function with
sensing tape
MPX FILTER not
effective
M
1
a
b
the sensing post and
is-positioning between
eaf switch
. Faulty switch
. Defective parts on
Dolby Encoder PC Bd
a.
b.
| Adjust the leaf switch
Replace SW814-1
Check/replace coils
L301, L302, or capacitors
C302, C303, or C304
PAUSE button not
functioning
d
Control Drive unit
ic
efective
epair/replace Control
Drive
READING FOR COLOR CODE-RESISTOR-
Example:
No.
No.
No.
No.
(Tolerance)
BRN 1
BLK 0
GRN 10°
GOL +5%
Follow: Reading 1MQ +57