Akai GX-F44R

2. PRE AMPLIFIER ADJUSTMENT
Adjustment Test Tape
t
Item Supply Signal Mowe
Adjustment
Result Remarks
Parts
10 kHz Test Tape
333 Hz Test Tape VR2 -5.5+0.5 dBm
bs PEE Revel (TF-101CL) FWDEB | pig Anip PCB (410 mV)
333 Hz Test Tape -5.5 +0.5 dBm
L 2 || REV EB Level" “re 0iCL) REE Pee Ge PCB (410 mV)
+
Pre Pes PCB ipa sch
NOTES: 1. Output volume should be at maximum.
2. Dolby NR Switch to OFF Position.
? EREQ (TF-106CH)
Normal
a enn pees FWD VCl 1 kHz to 10 kHz
Revpotise 95.5 dBm REC/PB Pre Amp PCB flat response
(FWD)
Normal
Position Normal Blank Tape VC? 1 kHz to 10 kHz
: Breauency, PHE LY) Sie Pre Amp PCB flat response
Response —25.5 dBm P P
(REV)
CrO,
2 Position seers — FWD/REV VR6 1 kHz to 10 kHz
Frequency ‘ REC/PB Pre Amp PCB flat response
—25.5 dBm
Response
Metal
7 | Position | Metal Blank tape | EWD/REV VRS | kHz to 10 kHz
Frequency : REC/PB Pre Amp PCB flat response
—25.5 dBm
Response
Normal Blank Tape | FWD/REV VR4 —-5.5 + 0.5 dBm |
G7) REC Tevel 1 kHz,-5.5dBm | REC/PB | Pre Amp PCB (410 mV)
fi fe a
. 19 kHz FL4 4 :
9 MPX Filter Foose ttntog REC Dolby (C) PCB Minimum Output | MPX Filter ON
ee ae + os 4
pens ; FL3 aes Set REC Volume
10 Bias Filter No Signal Input REC Dolby (C) PCB Minimum Output fsutaniindinn
im
i 11 VU Meter 1 kHz, —-5.5 dBm REC VRS 0 dB (VU)
Sensitivity from oscillator Dolby (C) PCB | indication
3. Except for Step 9 set Dolby Filter Switch to OFF Position.
4. Use the following cassette measuring tapes:
Normal Tape : Maxell UD C-60
CrO, Tape : TDK SA C-60
Metal Tape : TDK MAC C-60
3. DOLBY ADJUSTMENT
(Refer to Fig. 28 Dolby (C) PCB)
1) Set Dolby Switch to C-Type and the set to REC/
PAUSE mode.
2) Input the signal of 700 Hz from LINE IN and
adjust the input level so that TP1 will be 0 dBm
(0.775V).
3) Adjust VR3 (REC-AS) so that TP-REC will be
0+0.5 dBm.
4) Set Dolby Switch to OFF position.
5) Input the signal of 700 Hz from LINE IN and
adjust the input level so that TP1 will be —30.5
dBm.
6) Set Dolby Switch to C-Type.
27