Tascam da 88 service manual

Page 1

TASCAM

TEAC Professional Division

Digital Audio Tape Deck

Due to Improvement of the DA-88, part of the description in the service manual
of the DA~88 (P/N 5704066800) is slightly changed. Please note that this
supplement describes only changes in the service manuals

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Effective: November, 1994 4A1240 D00141400B

Page 2

DA-88

I. Note that the underlined portion has been changed]
2-2. Preparation (P. 4)

2. Connecting the oscilloscope
Connect CH1 of the oscilloscope across TF1 (A-HEAD)
or TPZ (B-IEAD) on the R/P AMP PCB and TP12
(GND), and CH2 across TPZ (SWP) on the SERVO
Egg and chassis (GND).

[0 Note that the underlined portions has been changedl

2-3. Adjusting the tension arm position and
torque (P. 4)

3. Confirming the FWD back tension
1). Read the torque value at the supplyrreel (white)
side. then confirm that the center value of the torque
fluctuations falls within the following range:
Standard value: torque value to to 12 g~cm
Fluctuation range: 3 gcm or less

4 Confirming the take-up torque of the take-up reel
1). Read the torque value at the take-up reel (black)
side, then. confirm that the center value of the torque
fluctuations falls within the following range:
Standard value: torque value 8 to 15 g-cm
Fluctuation value: 3 g-cm or less

5. Confirming the REV take-up torque
1). Press the SHUTTLE switch. then turn the SHUTTLE

knob to the left. Read the torque value at the
supply-reel (White) side, then confirm that the center
value of the torque fluctuations falls within the
following range :

Standard range: torque value 18 to 28 g~cm

Fluctuation range: 3 g~cm or less

8). Read the torque value at the take-up reel (black)
side. then confirm that the center value of the torque
fluctuations falls within the following range:

Standard mnge: a to 25 gem

IONote that the underlined portion has been changedj

2-7. Confirming the travel in F.FWD REW and
REV modes (P. 9)

1. In all modes. including F.FWD, REW and REV/SHUTTLE.
confirm that the tape is free from damage at each guide.
Notes: *If, in F.FWD mode,the impedance roller

generates a strange noise, replace it. '
at If the leading edge of the playback RF
waveform is slow to rise up (the waveform
gradually increases in level) in 2-5 or the
tape curl is excessive during reverse mode,
choose a nolvethylene slider washer (beneath

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