Frequency & Voltage Conversion - Teac A-450 Service Manual

b. BIAS ADJUSTMENTS
All deck can be tested using the procedures stated on page
22, "CrO, TAPE" in 7-3-2 using the following additional
information as applicable.
BIAS/EQ Switch Setting TEAC Test Tape Adjustments
CrO, MTT-505TB = VC101/201
HIGH MTT-501 VC102/202
NORMAL MTT-502R VC103/203
c. FREQUENCY SPECTRUM DIAGRAMS
Frequency Response limits other than the subsequent 2
graphs are the same as ones for U.S.A./{CANADA decks.
vssens te
10-3. FREQUENCY & VOLTAGE
CONVERSION
a, FREQUENCY CONVERSION PROCEDURE
(FOR ALL EXCEPT U.S.A./CANADA MODELS)
1. Disconnect the AC Power Cord and remove all audio
cables.
2. Remove the Bottom Cover, release the Drive Belt.
3. Take off the 2 screws from the Motor Pulley and invert
the Motor Pulley. (Small diameter on top for 60 Hz,
large for 50 Hz.)
4. Re-install the Belt on the pulley (top section) and
verify that the Belt is not riding on the lips of the
pulleys.
Reinstall the screws.
6. Rotate the Flywheel several turns to check for proper
seating.
7. The Frequency Selector Bar on the Power Supply PC
Board must be re-set to the correct frequency as
ms
Fig. 10-4 Power Supply PC BD.
Fig. 10-5 Motor Pulley
ae TAPE: MTT-501 (BIAS/EQ: HIGH)
RESPONSE IN dB
315 5063 10 BS 500 SK63K 1OKIZ. SK 50K
FREQUENCY IN Hz
Fig. 10-2 Overall Frequency Response Limits (for BIAS/EQ: HIGH)
RESPONSE IN dB
'
i
405063 100 SKESK = 10K SOK
St
FREQUENCY IN He
Fig. 10-3 Overall Frequency Response Limits {for BIAS/EQ: NORMAL)
indicated in the illustration.
8. Replace the Bottom Cover.
b. VOLTAGE SELECTOR SETTING PROCEDURE
(FOR GENERAL EXPORT MODELS)
1. Remove the AC Power Cord from the deck.
Take off the 2 screws holding the proteciive Guard
over the Voltage Selector Plug, and remove the Guard.
3. Pull out the Plug and re-insert it so the desiedd voltage
appears in the cut-out window.
4. Re-install the protective Guard.
Fig. 10-6 Voltage Conversion
31