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TROUBLE
SHOOTING
GUIDE
Ht trouble with the TC-788-4 occurs, make the following simple
checks to determine whether a professional enginger's skill is
required or not. Quite often h i - f i equipment fails to work proper
ly because of incorrectly made system connections or operating
errors. If the trouble persists after you have made these checks,
consult your nesrest Superscope Service Station.
Before entering the list of specified troubles below, first pay
attention to the following fundamental points:
'The AC power cord must be connected firmly to the recorder
and a wall outlet.
#Don't mix up inputs and outputs, front and back, left and right
'of the connecting cords. (Refer to page 4}. All connections
must be done firmly.
'sThe recordar controls should be left In the positions described
'on page 10 during normal operation.
'¢The amplifier volume, bolance, mode, function, input selector,
'and monitor switch settings should be dona correctly. Refer to
'the instruction manual of the amplifier.
'eHeads, capstans, and pinch rollers has
ally 10 ensure optimum performance.
to be cleaned periodt
'Symptoms
The tepe does not move when one of the function buttons is
pressed!
'The tape cubs a reel edge:
Recording cannot be made, or the sounds a°@ too low:
'The SIN-ratio of recorded sounds is too low:
Back channet sounds are mixed into the front channals
'Mic sounds are to0 lo.
Unbatenced tone in high or low froquencias.
Ssctaion occurs from the connected spedkers when trying to
record:
Switching pulses from axternal equipment can be heard on fe
cordings:
Previous recordings are not complataly erased:
No or vary low sound during playback:
Though playback only had been intended, the program was
erased:
Insufficient sound quality during playback :
Increased tape noi
Dropouts, wow or flutter:
Severe hum
No sound from connected headphones:
'The power cannot ba switched on:
Adjustmems,
'@Check for proper tape threading, Make sure there
is no slack
In the tope and the tension arms are in operating position,
Check the PAUSE lever setting.
'@ Check thé reeis for warp and replace them if necessary.
Set the Tape-height Adjustors correctly {Refer to page 6).
'#Set the REC MODE switches to REC and push the REC button
'and Be button simultangousty, (Make sure that the ted lamp in.
the EC button and those in the VUsmeters are lit.)
Clean the racord head.
'Turn the REC LEVEL contrats not in use fully counterclockwise,
'@Set the PAN POT switch to OFF.
'@Check the MIC REC LEVEL control
'ators to OFF.
Use low-impedance microphones.
'# Check the BIAS and EQ settings.
The correct settings for major
'tape brands are listed on page 10.
the LINE OUTputs of the TC-788-4 arg connected to the ain-
FAUX inputs and these sre switched on, change the
ampli
fer input seloatat to ancther postion,
Switch the speakers off for mic racordings,
'Try to connect the h i - f i equipment to a different AC power line
'than thet being used for washing-machings, dryars,
retrigarators,
fivorescent lamos or similar appli
ou can't rewire Your
house, see that these appliance
hed during record
ing.
'¢Clean the erase hoad,
#Cioan the heads,
'Set the MONITOR switches to TAPE.
Set the PE VOLUME controls in cenier ofick position.
Check the amplifier
input selector setting. (In case of a normal
onnection to the tape inputs this will be the monitor svitch.)
Fur the volume control of the amplifier louder,
'Chack the connections between the recorder LINE OUTputs and
the amplifier inputs.
'eNever forget to move the REC TIMER LOCK lever to the upper
Doctor afters ee, and ewiich the REC MODE switches to PB
'when no recording is intended.
#Clogn tha heads.
'Switch the REC MODE switches to PB.
'Clean the heeds,
Demagnetize the hads.
'#Clean pinch rotiors, capstans, and heads.
'Check the tape for'curls of crumbles.
Cheek whether the tape touches the reel edges.
'#Connect alt GROUND terminals 'of your steree equipment with
the one of the amplifier, and only this one fo an outer ground.
(Never make more than One ground connection')
Use shielded connecting cabies.
Ensure that cables aro not near transformers, generators or AC
power cords.
'¢ Check the HEADPHONE jack used and the HEADPHONE switch
'setting. (Refer to page 7)
Ensure that the PB LEVEL controls are around center click posi-
ton.
Use &-chm headphones.
'* Check the timer setting, if the TC-788-4 is connected to one.
od push the MIC ATTenu-
2
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